1
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Chen J, Zhang Q, Lu Z, Duan Y, Cao X, Huang J, Chen F. Reconciling East Asia's mid-Holocene temperature discrepancy through vegetation-climate feedback. Sci Bull (Beijing) 2024; 69:2420-2429. [PMID: 38693017 DOI: 10.1016/j.scib.2024.04.012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2023] [Revised: 02/28/2024] [Accepted: 03/07/2024] [Indexed: 05/03/2024]
Abstract
The term "Holocene temperature conundrum" refers to the inconsistencies between proxy-based reconstructions and transient model simulations, and it challenges our understanding of global temperature evolution during the Holocene. Climate reconstructions indicate a cooling trend following the Holocene Thermal Maximum, while model simulations indicate a consistent warming trend due to ice-sheet retreat and rising greenhouse gas concentrations. Various factors, such as seasonal biases and overlooked feedback processes, have been proposed as potential causes for this discrepancy. In this study, we examined the impact of vegetation-climate feedback on the temperature anomaly patterns in East Asia during the mid-Holocene (∼6 ka). By utilizing the fully coupled Earth system model EC-Earth and performing simulations with and without coupled dynamic vegetation, our objective was to isolate the influence of vegetation changes on regional temperature patterns. Our findings reveal that vegetation-climate feedback contributed to warming across most of East Asia, resulting in spatially diverse temperature changes during the mid-Holocene and significantly improved model-data agreement. These results highlight the crucial role of vegetation-climate feedback in addressing the Holocene temperature conundrum and emphasize its importance for simulating accurate climate scenarios.
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Affiliation(s)
- Jie Chen
- Key Laboratory of Western China's Environmental Systems (Ministry of Education), College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China
| | - Qiong Zhang
- Department of Physical Geography and Bolin Centre for Climate Research, Stockholm University, Stockholm 10691, Sweden.
| | - Zhengyao Lu
- Department of Physical Geography and Ecosystem Science, Lund University, Lund 22100, Sweden
| | - Yanwu Duan
- Group of Alpine Paleoecology and Human Adaptation (ALPHA), State Key Laboratory of Tibetan Plateau Earth System, Environment and Resources (TPESER), Institute of Tibetan Plateau Research (ITPCAS), Chinese Academy of Sciences (CAS), Beijing 100101, China
| | - Xianyong Cao
- Group of Alpine Paleoecology and Human Adaptation (ALPHA), State Key Laboratory of Tibetan Plateau Earth System, Environment and Resources (TPESER), Institute of Tibetan Plateau Research (ITPCAS), Chinese Academy of Sciences (CAS), Beijing 100101, China
| | - Jianping Huang
- Collaborative Innovation Center for Western Ecological Safety, Lanzhou University, Lanzhou 730000, China
| | - Fahu Chen
- Key Laboratory of Western China's Environmental Systems (Ministry of Education), College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China; Group of Alpine Paleoecology and Human Adaptation (ALPHA), State Key Laboratory of Tibetan Plateau Earth System, Environment and Resources (TPESER), Institute of Tibetan Plateau Research (ITPCAS), Chinese Academy of Sciences (CAS), Beijing 100101, China
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2
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An Z, Zhou W, Zhang Z, Zhang X, Liu Z, Sun Y, Clemens SC, Wu L, Zhao J, Shi Z, Ma X, Yan H, Li G, Cai Y, Yu J, Sun Y, Li S, Zhang Y, Stepanek C, Lohmann G, Dong G, Cheng H, Liu Y, Jin Z, Li T, Hao Y, Lei J, Cai W. Mid-Pleistocene climate transition triggered by Antarctic Ice Sheet growth. Science 2024; 385:560-565. [PMID: 39088600 DOI: 10.1126/science.abn4861] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2021] [Revised: 12/06/2023] [Accepted: 06/28/2024] [Indexed: 08/03/2024]
Abstract
Despite extensive investigation, the nature and causes of the Mid-Pleistocene Transition remain enigmatic. In this work, we assess its linkage to asynchronous development of bipolar ice sheets by synthesizing Pleistocene mid- to high-latitude proxy records linked to hemispheric ice sheet evolution. Our results indicate substantial growth of the Antarctic Ice Sheets (AISs) at 2.0 to 1.25 million years ago, preceding the rapid expansion of Northern Hemisphere Ice Sheets after ~1.25 million years ago. Proxy-model comparisons suggest that AIS and associated Southern Ocean sea ice expansion can induce northern high-latitude cooling and enhanced moisture transport to the Northern Hemisphere, thus triggering the Mid-Pleistocene Transition. The dynamic processes involved are crucial for assessing modern global warming that is already inducing asynchronous bipolar melting of ice sheets.
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Affiliation(s)
- Zhisheng An
- State Key Laboratory of Loess Science, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, China
- Institute of Global Environmental Change, Xi'an Jiaotong University, Xi'an 710049, China
- Interdisciplinary Research Center of Earth Science Frontier, Beijing Normal University, Beijing 100875, China
| | - Weijian Zhou
- State Key Laboratory of Loess Science, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, China
- Institute of Global Environmental Change, Xi'an Jiaotong University, Xi'an 710049, China
- Interdisciplinary Research Center of Earth Science Frontier, Beijing Normal University, Beijing 100875, China
| | - Zeke Zhang
- State Key Laboratory of Loess Science, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, China
- Institute of Global Environmental Change, Xi'an Jiaotong University, Xi'an 710049, China
- Department of Earth and Planetary Sciences, Nanjing University, Nanjing 210023, China
| | - Xu Zhang
- State Key Laboratory of Tibetan Plateau Earth System, Resources and Environment (TPESRE), Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, China
- British Antarctic Survey, Cambridge CB3 0ET, UK
| | - Zhonghui Liu
- State Key Laboratory of Loess Science, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, China
- Department of Earth Sciences, The University of Hong Kong, Hong Kong, China
| | - Youbin Sun
- State Key Laboratory of Loess Science, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, China
- Institute of Global Environmental Change, Xi'an Jiaotong University, Xi'an 710049, China
| | - Steven C Clemens
- Department of Earth, Environmental and Planetary Sciences, Brown University, Providence, RI 02912, USA
| | - Lixin Wu
- Laoshan Laboratory, Qingdao 266000, China
- Key Laboratory of Physical Oceanography/Institute for Advanced Ocean Studies, Ocean University of China, Qingdao 266100, China
| | - Jiaju Zhao
- State Key Laboratory of Loess Science, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, China
- Institute of Global Environmental Change, Xi'an Jiaotong University, Xi'an 710049, China
| | - Zhengguo Shi
- State Key Laboratory of Loess Science, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, China
- Institute of Global Environmental Change, Xi'an Jiaotong University, Xi'an 710049, China
| | - Xiaolin Ma
- State Key Laboratory of Loess Science, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, China
| | - Hong Yan
- State Key Laboratory of Loess Science, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, China
- Institute of Global Environmental Change, Xi'an Jiaotong University, Xi'an 710049, China
| | - Gaojun Li
- Department of Earth and Planetary Sciences, Nanjing University, Nanjing 210023, China
| | - Yanjun Cai
- Institute of Global Environmental Change, Xi'an Jiaotong University, Xi'an 710049, China
| | - Jimin Yu
- Laoshan Laboratory, Qingdao 266000, China
- Research School of Earth Sciences, Australian National University, Canberra, ACT 2601, Australia
| | - Yuchen Sun
- Alfred Wegener Institute Helmholtz Center for Polar and Marine Research, 27570 Bremerhaven, Germany
| | - Siqi Li
- State Key Laboratory of Tibetan Plateau Earth System, Resources and Environment (TPESRE), Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, China
| | - Yu'ao Zhang
- State Key Laboratory of Tibetan Plateau Earth System, Resources and Environment (TPESRE), Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, China
| | - Christian Stepanek
- Alfred Wegener Institute Helmholtz Center for Polar and Marine Research, 27570 Bremerhaven, Germany
| | - Gerrit Lohmann
- Alfred Wegener Institute Helmholtz Center for Polar and Marine Research, 27570 Bremerhaven, Germany
| | - Guocheng Dong
- State Key Laboratory of Loess Science, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, China
| | - Hai Cheng
- Institute of Global Environmental Change, Xi'an Jiaotong University, Xi'an 710049, China
| | - Yu Liu
- State Key Laboratory of Loess Science, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, China
| | - Zhangdong Jin
- State Key Laboratory of Loess Science, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, China
- Institute of Global Environmental Change, Xi'an Jiaotong University, Xi'an 710049, China
| | - Tao Li
- Key Laboratory of Palaeobiology and Petroleum Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, China
| | - Yifei Hao
- State Key Laboratory of Loess Science, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, China
| | - Jing Lei
- State Key Laboratory of Loess Science, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, China
- Xi'an Institute for Innovative Earth Environment Research, Xi'an 710061, China
| | - Wenju Cai
- State Key Laboratory of Loess Science, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, China
- Laoshan Laboratory, Qingdao 266000, China
- Key Laboratory of Physical Oceanography/Institute for Advanced Ocean Studies, Ocean University of China, Qingdao 266100, China
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3
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Liu S, Stoof-Leichsenring KR, Harms L, Schulte L, Mischke S, Kruse S, Zhang C, Herzschuh U. Tibetan terrestrial and aquatic ecosystems collapsed with cryosphere loss inferred from sedimentary ancient metagenomics. SCIENCE ADVANCES 2024; 10:eadn8490. [PMID: 38781339 PMCID: PMC11114237 DOI: 10.1126/sciadv.adn8490] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/03/2024] [Accepted: 04/18/2024] [Indexed: 05/25/2024]
Abstract
Glacier and permafrost shrinkage and land-use intensification threaten mountain wildlife and affect nature conservation strategies. Here, we present paleometagenomic records of terrestrial and aquatic taxa from the southeastern Tibetan Plateau covering the last 18,000 years to help understand the complex alpine ecosystem dynamics. We infer that steppe-meadow became woodland at 14 ka (cal BP) controlled by cryosphere loss, further driving a herbivore change from wild yak to deer. These findings weaken the hypothesis of top-down control by large herbivores in the terrestrial ecosystem. We find a turnover in the aquatic communities at 14 ka, transitioning from glacier-related (blue-green) algae to abundant nonglacier-preferring picocyanobacteria, macrophytes, fish, and otters. There is no evidence for substantial effects of livestock herding in either ecosystem. Using network analysis, we assess the stress-gradient hypothesis and reveal that root hemiparasitic and cushion plants are keystone taxa. With ongoing cryosphere loss, the protection of their habitats is likely to be of conservation benefit on the Tibetan Plateau.
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Affiliation(s)
- Sisi Liu
- Polar Terrestrial Environmental Systems, Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Potsdam 14473, Germany
- Institute of Environmental Science and Geography, University of Potsdam, Potsdam 14469, Germany
| | - Kathleen R. Stoof-Leichsenring
- Polar Terrestrial Environmental Systems, Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Potsdam 14473, Germany
| | - Lars Harms
- Computing and Data Centre, Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Bremerhaven 27570, Germany
| | - Luise Schulte
- Polar Terrestrial Environmental Systems, Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Potsdam 14473, Germany
| | - Steffen Mischke
- Institute of Earth Sciences, University of Iceland, Reykjavík 102, Iceland
| | - Stefan Kruse
- Polar Terrestrial Environmental Systems, Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Potsdam 14473, Germany
| | - Chengjun Zhang
- School of Earth Sciences, Lanzhou University, Lanzhou 73000, China
| | - Ulrike Herzschuh
- Polar Terrestrial Environmental Systems, Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Potsdam 14473, Germany
- Institute of Environmental Science and Geography, University of Potsdam, Potsdam 14469, Germany
- Institute of Biochemistry and Biology, University of Potsdam, Potsdam 14476, Germany
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4
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Zheng Y, Liu H, Wang H, Xie S, Yang H, Feng S, Zhang Z, Zhao W, Liang B. Millennial changes and cooling trends in land surface warm-season temperatures during the Holocene. Sci Bull (Beijing) 2024:S2095-9273(24)00342-6. [PMID: 38926060 DOI: 10.1016/j.scib.2024.05.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2023] [Revised: 05/10/2024] [Accepted: 05/10/2024] [Indexed: 06/28/2024]
Abstract
The scarcity of proxies and calibration models for quantitatively reconstructing millennial timescale seasonal temperature tremendously constraints our understanding of the Holocene thermal variation and its driven mechanisms. Here, we established two global warm-season temperature models by applying deep learning neural network analysis to the branched tetraether membrane lipids originating from surface soil and lacustrine sediment bacteria. We utilized these optimal models in global well-dated lacustrine, peatland, and loess profiles covering the Holocene. All reconstructions of warm-season temperatures, consistent with climate model simulations, indicate cooling trends since the early Holocene, primarily induced by decreased solar radiation in the Northern Hemisphere due to the precession peak at the early. We further demonstrated that the membrane lipids can effectively enhance the future millennial seasonal temperature research, including winter temperatures, without being restricted by geographical location and sedimentary carrier.
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Affiliation(s)
- Yukun Zheng
- College of Urban and Environmental Sciences and MOE Laboratory for Earth Surface Processes, Peking University, Beijing 100871, China
| | - Hongyan Liu
- College of Urban and Environmental Sciences and MOE Laboratory for Earth Surface Processes, Peking University, Beijing 100871, China.
| | - Hongya Wang
- College of Urban and Environmental Sciences and MOE Laboratory for Earth Surface Processes, Peking University, Beijing 100871, China
| | - Shucheng Xie
- State Key Laboratory of Biogeology and Environmental Geology, School of Earth Sciences, China University of Geosciences, Wuhan 430074, China
| | - Huan Yang
- Hubei Key Laboratory of Critical Zone Evolution, School of Geography and Information Engineering, China University of Geosciences, Wuhan 430074, China
| | - Siwen Feng
- College of Urban and Environmental Sciences and MOE Laboratory for Earth Surface Processes, Peking University, Beijing 100871, China
| | - Zeyu Zhang
- College of Urban and Environmental Sciences and MOE Laboratory for Earth Surface Processes, Peking University, Beijing 100871, China
| | - Wenjie Zhao
- College of Urban and Environmental Sciences and MOE Laboratory for Earth Surface Processes, Peking University, Beijing 100871, China
| | - Boyi Liang
- College of Forestry, Precision Forestry Key Laboratory of Beijing, Beijing Forestry University, Beijing 100083, China
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5
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Dragonetti C, Daskalova G, Di Marco M. The exposure of the world's mountains to global change drivers. iScience 2024; 27:109734. [PMID: 38689645 PMCID: PMC11059124 DOI: 10.1016/j.isci.2024.109734] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2023] [Revised: 11/17/2023] [Accepted: 04/10/2024] [Indexed: 05/02/2024] Open
Abstract
Global change affects mountain areas at different levels, with some mountains being more exposed to change in climate or environmental conditions and others acting as local refugia. We quantified the exposure of the world's mountains to three drivers of change, climate, land use, and human population density, using two spatial-temporal metrics (velocity and magnitude of change). We estimated the acceleration of change for these drivers by comparing past (1975-2005) vs. future (2020-2050) exposure, and we also compared exposure in lowlands vs. mountains. We found Africa's tropical mountains facing the highest future exposure to multiple drivers of change, thus requiring targeted adaptation and mitigation strategies to preserve biodiversity. European and North America's mountains, in contrast, experience more limited exposure to global change and could act as local refugia for biodiversity. This knowledge can be used to prioritize local-scale interventions and planning long-term monitoring to reduce the risks faced by mountain biodiversity.
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Affiliation(s)
- Chiara Dragonetti
- Department of Biology and Biotechnologies “Charles Darwin”, Sapienza University of Rome, viale dell'Università 32, I-00185 Rome, Italy
| | - Gergana Daskalova
- International Institute for Applied Systems Analysis (IIASA), Schloßpl. 1, 2361 Laxenburg, Austria
| | - Moreno Di Marco
- Department of Biology and Biotechnologies “Charles Darwin”, Sapienza University of Rome, viale dell'Università 32, I-00185 Rome, Italy
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6
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Pearson AR, Fox BRS, Hellstrom JC, Vandergoes MJ, Breitenbach SFM, Drysdale RN, Höpker SN, Wood CT, Schiller M, Hartland A. Warming drives dissolved organic carbon export from pristine alpine soils. Nat Commun 2024; 15:3522. [PMID: 38664386 PMCID: PMC11045798 DOI: 10.1038/s41467-024-47706-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2023] [Accepted: 04/10/2024] [Indexed: 04/28/2024] Open
Abstract
Despite decades of research, the influence of climate on the export of dissolved organic carbon (DOC) from soil remains poorly constrained, adding uncertainty to global carbon models. The limited temporal range of contemporary monitoring data, ongoing climate reorganisation and confounding anthropogenic activities muddy the waters further. Here, we reconstruct DOC leaching over the last ~14,000 years using alpine environmental archives (two speleothems and one lake sediment core) across 4° of latitude from Te Waipounamu/South Island of Aotearoa New Zealand. We selected broadly comparable palaeoenvironmental archives in mountainous catchments, free of anthropogenically-induced landscape changes prior to ~1200 C.E. We show that warmer temperatures resulted in increased allochthonous DOC export through the Holocene, most notably during the Holocene Climatic Optimum (HCO), which was some 1.5-2.5 °C warmer than the late pre-industrial period-then decreased during the cooler mid-Holocene. We propose that temperature exerted the key control on the observed doubling to tripling of soil DOC export during the HCO, presumably via temperature-mediated changes in vegetative soil C inputs and microbial degradation rates. Future warming may accelerate DOC export from mountainous catchments, with implications for the global carbon cycle and water quality.
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Affiliation(s)
- Andrew R Pearson
- Environmental Research Institute, School of Science, Faculty of Science and Engineering, University of Waikato, Kirikiriroa Hamilton, Waikato, Aotearoa, New Zealand.
- Institute of Environmental Science and Research (ESR), Ōtautahi Christchurch, Aotearoa, New Zealand.
| | - Bethany R S Fox
- Department of Biological and Geographical Sciences, University of Huddersfield, Huddersfield, UK
| | - John C Hellstrom
- School of Geography, Earth and Atmospheric Sciences, University of Melbourne, Melbourne, VIC, Australia
| | | | | | - Russell N Drysdale
- School of Geography, Earth and Atmospheric Sciences, University of Melbourne, Melbourne, VIC, Australia
| | - Sebastian N Höpker
- Environmental Research Institute, School of Science, Faculty of Science and Engineering, University of Waikato, Kirikiriroa Hamilton, Waikato, Aotearoa, New Zealand
| | - Christopher T Wood
- Environmental Research Institute, School of Science, Faculty of Science and Engineering, University of Waikato, Kirikiriroa Hamilton, Waikato, Aotearoa, New Zealand
- GNS Science, Te Awa Kairangi ki Tai Lower Hutt, Aotearoa, New Zealand
| | - Martin Schiller
- Centre for Star and Planet Formation, Globe Institute, University of Copenhagen, Copenhagen, Denmark
| | - Adam Hartland
- Environmental Research Institute, School of Science, Faculty of Science and Engineering, University of Waikato, Kirikiriroa Hamilton, Waikato, Aotearoa, New Zealand.
- Lincoln Agritech Ltd, Ruakura, Kirikiriroa Hamilton, Waikato, Aotearoa, New Zealand.
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7
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Lowry DP, Han HK, Golledge NR, Gomez N, Johnson KM, McKay RM. Ocean cavity regime shift reversed West Antarctic grounding line retreat in the late Holocene. Nat Commun 2024; 15:3176. [PMID: 38653971 DOI: 10.1038/s41467-024-47369-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2023] [Accepted: 03/25/2024] [Indexed: 04/25/2024] Open
Abstract
Recent geologic and modeled evidence suggests that the grounding line of the Siple Coast of the West Antarctic Ice Sheet (WAIS) retreated hundreds of kilometers beyond its present position in the middle to late Holocene and readvanced within the past 1.7 ka. This grounding line reversal has been attributed to both changing rates of isostatic rebound and regional climate change. Here, we test these two hypotheses using a proxy-informed ensemble of ice sheet model simulations with varying ocean thermal forcing, global glacioisostatic adjustment (GIA) model simulations, and coupled ice sheet-GIA simulations that consider the interactions between these processes. Our results indicate that a warm to cold ocean cavity regime shift is the most likely cause of this grounding line reversal, but that GIA influences the rate of ice sheet response to oceanic changes. This implies that the grounding line here is sensitive to future changes in sub-ice shelf ocean circulation.
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Affiliation(s)
- Daniel P Lowry
- Department of Surface Geosciences, GNS Science, Lower Hutt, New Zealand.
| | - Holly K Han
- Fluid Dynamics and Solid Mechanics Group, Los Alamos National Laboratory, Los Alamos, NM, USA
- Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA
| | - Nicholas R Golledge
- Antarctic Research Centre, Victoria University of Wellington, Wellington, New Zealand
| | - Natalya Gomez
- Department of Earth and Planetary Sciences, McGill University, Montréal, QC, Canada
| | - Katelyn M Johnson
- Department of Surface Geosciences, GNS Science, Lower Hutt, New Zealand
| | - Robert M McKay
- Antarctic Research Centre, Victoria University of Wellington, Wellington, New Zealand
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8
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Lyu B, Liu Q, Wu Y, Nguyen TQ, Che J, Nguyen SN, Myers EA, Burbrink FT, Guo P, Wang J. Genomic analysis reveals deep population divergence in the water snake Trimerodytes percarinatus (Serpentes, Natricidae). Ecol Evol 2024; 14:e11278. [PMID: 38628918 PMCID: PMC11019134 DOI: 10.1002/ece3.11278] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2023] [Revised: 02/26/2024] [Accepted: 04/02/2024] [Indexed: 04/19/2024] Open
Abstract
Although several phylogeographic studies of Asian snakes have been conducted, most have focused on pitvipers, with non-venomous snakes, such as colubrids or natricids, remaining poorly studied. The Chinese keelback water snake (Trimerodytes percarinatus Boulenger) is a widespread, semiaquatic, non-venomous species occurring in China and southeastern Asia. Based on mitochondrial DNA (mtDNA) and single nucleotide polymorphism (SNP) data, we explored the population genetic structure, genetic diversity, and evolutionary history of this species. MtDNA-based phylogenetic analysis showed that T. percarinatus was composed of five highly supported and geographically structured lineages. SNP-based phylogenetic analysis, principal component analysis, and population structure analysis consistently revealed four distinct, geographically non-overlapping lineages, which was different from the mtDNA-based analysis in topology. Estimation of divergence dates and ancestral area of origin suggest that T. percarinatus originated ~12.68 million years ago (95% highest posterior density: 10.36-15.96 Mya) in a region covering southwestern China and Vietnam. Intraspecific divergence may have been triggered by the Qinghai-Xizang Plateau uplift. Population demographics and ecological niche modeling indicated that the effective population size fluctuated during 0.5 Mya and 0.002 Mya. Based on the data collected here, we also comment on the intraspecific taxonomy of T. percarinatus and question the validity of the subspecies T. p. suriki.
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Affiliation(s)
- Bing Lyu
- Ministry of Education Key Laboratory for Ecology of Tropical Islands, Key Laboratory of Tropical Animal and Plant Ecology of Hainan Province, College of Life SciencesHainan Normal UniversityHaikouChina
- Faculty of Agriculture, Forestry and Food EngineeringYibin UniversityYibinChina
| | - Qin Liu
- Faculty of Agriculture, Forestry and Food EngineeringYibin UniversityYibinChina
| | - Yayong Wu
- Faculty of Agriculture, Forestry and Food EngineeringYibin UniversityYibinChina
| | - Truong Q. Nguyen
- Institute of Ecology and Biological ResourcesVietnam Academy of Science and TechnologyHanoiVietnam
- Vietnam Academy of Science and TechnologyGraduate University of Science and TechnologyHanoiVietnam
| | - Jing Che
- State Key Laboratory of Genetic Resources and Evolution & Yunnan Key Laboratory of Biodiversity and Ecological Conservation of Gaoligong Mountain, Kunming Institute of ZoologyChinese Academy of SciencesKunmingChina
| | - Sang N. Nguyen
- Institute of Tropical BiologyVietnam Academy of Science and TechnologyHo Chi Minh CityVietnam
| | - Edward A. Myers
- Department of HerpetologyCalifornia Academy of SciencesSan FranciscoCaliforniaUSA
| | - Frank T. Burbrink
- Department of HerpetologyAmerican Museum of Natural HistoryNew YorkNew YorkUSA
| | - Peng Guo
- Faculty of Agriculture, Forestry and Food EngineeringYibin UniversityYibinChina
| | - Jichao Wang
- Ministry of Education Key Laboratory for Ecology of Tropical Islands, Key Laboratory of Tropical Animal and Plant Ecology of Hainan Province, College of Life SciencesHainan Normal UniversityHaikouChina
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9
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Clark PU, Shakun JD, Rosenthal Y, Köhler P, Bartlein PJ. Global and regional temperature change over the past 4.5 million years. Science 2024; 383:884-890. [PMID: 38386742 DOI: 10.1126/science.adi1908] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2023] [Accepted: 01/16/2024] [Indexed: 02/24/2024]
Abstract
Much of our understanding of Cenozoic climate is based on the record of δ18O measured in benthic foraminifera. However, this measurement reflects a combined signal of global temperature and sea level, thus preventing a clear understanding of the interactions and feedbacks of the climate system in causing global temperature change. Our new reconstruction of temperature change over the past 4.5 million years includes two phases of long-term cooling, with the second phase of accelerated cooling during the Middle Pleistocene Transition (1.5 to 0.9 million years ago) being accompanied by a transition from dominant 41,000-year low-amplitude periodicity to dominant 100,000-year high-amplitude periodicity. Changes in the rates of long-term cooling and variability are consistent with changes in the carbon cycle driven initially by geologic processes, followed by additional changes in the Southern Ocean carbon cycle.
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Affiliation(s)
- Peter U Clark
- College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, OR 97331, USA
- School of Geography and Environmental Sciences, University of Ulster, Coleraine BT52 1SA, Northern Ireland, UK
| | - Jeremy D Shakun
- Department of Earth and Environmental Sciences, Boston College, Chestnut Hill, MA 02467, USA
| | - Yair Rosenthal
- Department of Marine and Coastal Science, Rutgers The State University, New Brunswick, NJ 08901, USA
- Department of Earth and Planetary Sciences, Rutgers The State University, New Brunswick, NJ 08901, USA
| | - Peter Köhler
- Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, 27570 Bremerhaven, Germany
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10
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Jiang J, Meng B, Wang H, Liu H, Song M, He Y, Zhao C, Cheng J, Chu G, Krivonogov S, Liu W, Liu Z. Spatial patterns of Holocene temperature changes over mid-latitude Eurasia. Nat Commun 2024; 15:1507. [PMID: 38374274 PMCID: PMC10876552 DOI: 10.1038/s41467-024-45883-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2023] [Accepted: 02/05/2024] [Indexed: 02/21/2024] Open
Abstract
The Holocene temperature conundrum, the discrepancy between proxy-based Holocene global cooling and simulated global annual warming trends, remains controversial. Meanwhile, reconstructions and simulations show inconsistent spatial patterns of terrestrial temperature changes. Here we report Holocene alkenone records to address spatial patterns over mid-latitude Eurasia. In contrast with long-term cooling trends in warm season temperatures in northeastern China, records from southwestern Siberia are characterized by colder conditions before ~6,000 years ago, thus long-term warming trends. Together with existing records from surrounding regions, we infer that colder airmass might have prevailed in the interior of mid-latitude Eurasian continent during the early to mid-Holocene, perhaps associated with atmospheric response to remnant ice sheets. Our results challenge the proposed seasonality bias in proxies and modeled spatial patterns in study region, highlighting that spatial patterns of Holocene temperature changes should be re-considered in record integrations and model simulations, with important implications for terrestrial hydroclimate changes.
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Affiliation(s)
- Jiawei Jiang
- Department of Earth Sciences, The University of Hong Kong, Hong Kong, China
| | - Bowen Meng
- Department of Earth Sciences, The University of Hong Kong, Hong Kong, China
- Research Institute of Petroleum Exploration and Development, PetroChina, Beijing, China
| | - Huanye Wang
- State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Center for Excellence in Quaternary Science and Global Change, Chinese Academy of Sciences, Xi'an, 710061, China
| | - Hu Liu
- State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Center for Excellence in Quaternary Science and Global Change, Chinese Academy of Sciences, Xi'an, 710061, China
| | - Mu Song
- Department of Earth Sciences, The University of Hong Kong, Hong Kong, China
| | - Yuxin He
- Key Laboratory of Geoscience Big Data and Deep Resource of Zhejiang Province, School of Earth Sciences, Zhejiang University, Hangzhou, 310027, China
| | - Cheng Zhao
- School of Geography and Ocean Science, Nanjing University, Nanjing, 210023, China
| | - Jun Cheng
- Key Laboratory of Meteorological Disaster, Nanjing University of Information Science and Technology, Nanjing, 210044, China
| | - Guoqiang Chu
- Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China.
| | - Sergey Krivonogov
- Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu, 610031, China.
| | - Weiguo Liu
- State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Center for Excellence in Quaternary Science and Global Change, Chinese Academy of Sciences, Xi'an, 710061, China
| | - Zhonghui Liu
- Department of Earth Sciences, The University of Hong Kong, Hong Kong, China.
- Institute of Climate and Carbon Neutrality, The University of Hong Kong, Hong Kong, China.
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11
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Qin SY, Zuo ZY, Xu SX, Liu J, Yang FM, Luo YH, Ye JW, Zhao Y, Rong J, Liu B, Ma PF, Li DZ. Anthropogenic disturbance driving population decline of a dominant tree in East Asia evergreen broadleaved forests over the last 11,000 years. CONSERVATION BIOLOGY : THE JOURNAL OF THE SOCIETY FOR CONSERVATION BIOLOGY 2024; 38:e14180. [PMID: 37700668 DOI: 10.1111/cobi.14180] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/03/2023] [Revised: 05/09/2023] [Accepted: 06/12/2023] [Indexed: 09/14/2023]
Abstract
Current biodiversity loss is generally considered to have been caused by anthropogenic disturbance, but it is unclear when anthropogenic activities began to affect biodiversity loss. One hypothesis suggests it began with the Industrial Revolution, whereas others propose that anthropogenic disturbance has been associated with biodiversity decline since the early Holocene. To test these hypotheses, we examined the unique vegetation of evergreen broadleaved forests (EBLFs) in East Asia, where humans have affected landscapes since the early Holocene. We adopted a genomic approach to infer the demographic history of a dominant tree (Litsea elongata) of EBLFs. We used Holocene temperature and anthropogenic disturbance factors to calculate the correlation between these variables and the historical effective population size of L. elongata with Spearman statistics and integrated the maximum-entropy niche model to determine the impact of climate change and anthropogenic disturbance on fluctuation in its effective population size. We identified 9 well-defined geographic clades for the populations of L. elongata. Based on the estimated historical population sizes of these clades, all the populations contracted, indicating persistent population decline over the last 11,000 years. Demographic history of L. elongata and human population change, change in cropland use, and change in irrigated rice area were significantly negatively correlated, whereas climate change in the Holocene was not correlated with demographic history. Our results support the early human impact hypothesis and provide comprehensive evidence that early anthropogenic disturbance may contribute to the current biodiversity crisis in East Asia.
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Affiliation(s)
- Sheng-Yuan Qin
- Germplasm Bank of Wild Species, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China
- Kunming College of Life Science, University of Chinese Academy of Sciences, Kunming, China
| | - Zheng-Yu Zuo
- Germplasm Bank of Wild Species, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China
- Kunming College of Life Science, University of Chinese Academy of Sciences, Kunming, China
| | - Shuang-Xiu Xu
- Germplasm Bank of Wild Species, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China
- Kunming College of Life Science, University of Chinese Academy of Sciences, Kunming, China
| | - Jie Liu
- CAS Key Laboratory for Plant Diversity and Biogeography of East Asia, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China
| | - Feng-Mao Yang
- Kunming College of Life Science, University of Chinese Academy of Sciences, Kunming, China
- CAS Key Laboratory for Plant Diversity and Biogeography of East Asia, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China
| | - Ya-Huang Luo
- CAS Key Laboratory for Plant Diversity and Biogeography of East Asia, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China
| | - Jun-Wei Ye
- Germplasm Bank of Wild Species, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China
- Key Laboratory for Forest Resources Conservation and Utilization in the Southwest Mountains of China, Ministry of Education, Southwest Forestry University, Kunming, China
| | - Yao Zhao
- Jiangxi Province Key Laboratory of Watershed Ecosystem Change and Biodiversity, Center for Watershed Ecology, Institute of Life Science and School of Life Sciences, Nanchang University, Nanchang, China
| | - Jun Rong
- Jiangxi Province Key Laboratory of Watershed Ecosystem Change and Biodiversity, Center for Watershed Ecology, Institute of Life Science and School of Life Sciences, Nanchang University, Nanchang, China
| | - Bing Liu
- State Key Laboratory of Systematic and Evolutionary Botany, Institute of Botany, Chinese Academy of Sciences, Beijing, China
- Sino-African Joint Research Center, Chinese Academy of Sciences, Wuhan, China
| | - Peng-Fei Ma
- Germplasm Bank of Wild Species, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China
| | - De-Zhu Li
- Germplasm Bank of Wild Species, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China
- Kunming College of Life Science, University of Chinese Academy of Sciences, Kunming, China
- CAS Key Laboratory for Plant Diversity and Biogeography of East Asia, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China
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12
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Yuan S, Chiang HW, Liu G, Bijaksana S, He S, Jiang X, Imran AM, Wicaksono SA, Wang X. The strength, position, and width changes of the intertropical convergence zone since the Last Glacial Maximum. Proc Natl Acad Sci U S A 2023; 120:e2217064120. [PMID: 38033310 PMCID: PMC10666097 DOI: 10.1073/pnas.2217064120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2022] [Accepted: 09/18/2023] [Indexed: 12/02/2023] Open
Abstract
The intertropical convergence zone (ITCZ) plays a key role in regulating tropical hydroclimate and global water cycle through changes in its convection strength, latitudinal position, and width. The long-term variability of the ITCZ, along with the corresponding driving mechanisms, however, remains obscure, mainly because it is difficult to separate different ITCZ variables in paleoclimate proxy records. Here, we report a speleothem oxygen isotope (δ18O) record from southwestern Sulawesi, Indonesia, and compile it with other speleothem records from the Maritime Continent. Using the spatial gradient of speleothem δ18O along a transect across the ITCZ, we constrain ITCZ variabilities over the Maritime Continent during the past 30,000 y. We find that ITCZ convection strength overall intensified from the last glacial period to the Holocene, following changes in climate boundary conditions. The mean position of the regional ITCZ has moved latitudinally no more than 3° in the past 30,000 y, consistent with the deduction from the atmospheric energy framework. However, different from modern observations and model simulations for future warming, the ITCZ appeared narrower during both the late Holocene and most part of the last glacial period, and its expansion occurred during Heinrich stadials and the early-to-mid Holocene. We also find that during the last glacial and deglacial period, prominent millennial-scale ITCZ changes were closely tied to the variability of the Atlantic meridional overturning circulation (AMOC), whereas during the Holocene, they were predominantly modulated by the long-term variability of the Walker circulation.
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Affiliation(s)
- Shufang Yuan
- Earth Observatory of Singapore, Nanyang Technological University, Singapore639798, Singapore
- Asian School of Environment, Nanyang Technological University, 639798, Singapore
| | - Hong-Wei Chiang
- Department of Geosciences, National Taiwan University, Taipei10617, Taiwan
| | - Guangxin Liu
- Department of Atmospheric Science, Yunnan University, Kunming650500, China
| | - Satria Bijaksana
- Faculty of Mining and Petroleum Engineering, Institut Teknologi Bandung, Bandung40132, Indonesia
| | - Shaoneng He
- Earth Observatory of Singapore, Nanyang Technological University, Singapore639798, Singapore
- Asian School of Environment, Nanyang Technological University, 639798, Singapore
| | - Xiuyang Jiang
- School of Geographical Sciences, Fujian Normal University, Fuzhou350007, China
| | - Andi M. Imran
- Department of Geological Engineering, Hasanuddin University, Makassar90245, Indonesia
| | - Satrio A. Wicaksono
- Department of Earth, Environmental, and Planetary Sciences, Brown University, Providence, RI02912
| | - Xianfeng Wang
- Earth Observatory of Singapore, Nanyang Technological University, Singapore639798, Singapore
- Asian School of Environment, Nanyang Technological University, 639798, Singapore
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13
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Stegner MA, Spanbauer TL. North American pollen records provide evidence for macroscale ecological changes in the Anthropocene. Proc Natl Acad Sci U S A 2023; 120:e2306815120. [PMID: 37844232 PMCID: PMC10614604 DOI: 10.1073/pnas.2306815120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2023] [Accepted: 09/02/2023] [Indexed: 10/18/2023] Open
Abstract
Recent global changes associated with anthropogenic activities are impacting ecological systems globally, giving rise to the Anthropocene. Critical reorganization of biological communities and biodiversity loss are expected to accelerate as anthropogenic global change continues. Long-term records offer context for understanding baseline conditions and those trajectories that are beyond the range of normal fluctuation seen over recent millennia: Are we causing changes that are fundamentally different from changes in the past? Using a rich dataset of late Quaternary pollen records, stored in the open-access and community-curated Neotoma database, we analyzed changes in biodiversity and community composition since the end Pleistocene in North America. We measured taxonomic richness, short-term taxonomic loss and gain, first/last appearances (FAD/LAD), and abrupt community change. For all analyses, we incorporated age-model uncertainty and accounted for differences in sample size to generate conservative estimates. The most prominent signals of elevated vegetation change were seen during the Pleistocene-Holocene transition and since 200 calendar years before present (cal YBP). During the Pleistocene-Holocene transition, abrupt changes and FADs were elevated, and from 200 to -50 cal YBP, we found increases in short-term taxonomic loss, FADs, LADs, and abrupt changes. Taxonomic richness declined from ~13,000 cal YBP until about 6,000 cal YBP and then increased until the present, reaching levels seen during the end Pleistocene. Regionally, patterns were highly variable. These results show that recent changes associated with anthropogenic impacts are comparable to the landscape changes that took place as we moved from a glacial to interglacial world.
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Affiliation(s)
| | - Trisha L. Spanbauer
- Department of Environmental Sciences and Lake Erie Center, University of Toledo, Toledo, OH43606
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14
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Zhang G, Cui C, Wangdue S, Lu H, Chen H, Xi L, He W, Yuan H, Tsring T, Chen Z, Yang F, Tsering T, Li S, Tashi N, Yang T, Tong Y, Wu X, Li L, He Y, Cao P, Dai Q, Liu F, Feng X, Wang T, Yang R, Ping W, Zhang M, Gao X, Liu Y, Wang W, Fu Q. Maternal genetic history of ancient Tibetans over the past 4000 years. J Genet Genomics 2023; 50:765-775. [PMID: 36933795 DOI: 10.1016/j.jgg.2023.03.007] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2023] [Revised: 03/14/2023] [Accepted: 03/14/2023] [Indexed: 03/17/2023]
Abstract
The settlement of the Tibetan Plateau epitomizes human adaptation to a high-altitude environment that poses great challenges to human activity. Here, we reconstruct a 4000-year maternal genetic history of Tibetans using 128 ancient mitochondrial genome data from 37 sites in Tibet. The phylogeny of haplotypes M9a1a, M9a1b, D4g2, G2a'c, and D4i show that ancient Tibetans share the most recent common ancestor with ancient Middle and Upper Yellow River populations around the Early and Middle Holocene. In addition, the connections between Tibetans and Northeastern Asians vary over the past 4000 years, with a stronger matrilineal connection between the two during 4000 BP-3000 BP, and a weakened connection after 3000 BP, that are coincident with climate change, followed by a reinforced connection after the Tubo period (1400 BP-1100 BP). Besides, an over 4000-year matrilineal continuity is observed in some of the maternal lineages. We also find the maternal genetic structure of ancient Tibetans is correlated to the geography and interactions between ancient Tibetans and ancient Nepal and Pakistan populations. Overall, the maternal genetic history of Tibetans can be characterized as a long-term matrilineal continuity with frequent internal and external population interactions that are dynamically shaped by geography, climate changes, as well as historical events.
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Affiliation(s)
- Ganyu Zhang
- Key Laboratory of Vertebrate Evolution and Human Origins, Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, Beijing 100044, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Can Cui
- Key Laboratory of Vertebrate Evolution and Human Origins, Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, Beijing 100044, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Shargan Wangdue
- Tibet Institute for Conservation and Research of Cultural Relics, Lhasa, Tibet 850000, China
| | - Hongliang Lu
- Center for Archaeological Science, School of Archaeology and Museology, Sichuan University, Chengdu, Sichuan 610064, China
| | - Honghai Chen
- School of Cultural Heritage, Northwest University, Xi'an, Shaanxi 710069, China
| | - Lin Xi
- Tibet Institute for Conservation and Research of Cultural Relics, Lhasa, Tibet 850000, China
| | - Wei He
- Tibet Institute for Conservation and Research of Cultural Relics, Lhasa, Tibet 850000, China
| | - Haibing Yuan
- Center for Archaeological Science, School of Archaeology and Museology, Sichuan University, Chengdu, Sichuan 610064, China
| | - Tinley Tsring
- Tibet Institute for Conservation and Research of Cultural Relics, Lhasa, Tibet 850000, China
| | - Zujun Chen
- Tibet Institute for Conservation and Research of Cultural Relics, Lhasa, Tibet 850000, China
| | - Feng Yang
- Center for Archaeological Science, School of Archaeology and Museology, Sichuan University, Chengdu, Sichuan 610064, China
| | - Tashi Tsering
- Tibet Institute for Conservation and Research of Cultural Relics, Lhasa, Tibet 850000, China
| | - Shuai Li
- Center for Archaeological Science, School of Archaeology and Museology, Sichuan University, Chengdu, Sichuan 610064, China
| | - Norbu Tashi
- Tibet Institute for Conservation and Research of Cultural Relics, Lhasa, Tibet 850000, China
| | - Tsho Yang
- Tibet Institute for Conservation and Research of Cultural Relics, Lhasa, Tibet 850000, China
| | - Yan Tong
- Tibet Institute for Conservation and Research of Cultural Relics, Lhasa, Tibet 850000, China
| | - Xiaohong Wu
- School of Archaeology and Museology, Peking University, Beijing 100871, China
| | - Linhui Li
- Tibet Institute for Conservation and Research of Cultural Relics, Lhasa, Tibet 850000, China
| | - Yuanhong He
- Center for Archaeological Science, School of Archaeology and Museology, Sichuan University, Chengdu, Sichuan 610064, China
| | - Peng Cao
- Key Laboratory of Vertebrate Evolution and Human Origins, Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, Beijing 100044, China
| | - Qingyan Dai
- Key Laboratory of Vertebrate Evolution and Human Origins, Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, Beijing 100044, China
| | - Feng Liu
- Key Laboratory of Vertebrate Evolution and Human Origins, Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, Beijing 100044, China
| | - Xiaotian Feng
- Key Laboratory of Vertebrate Evolution and Human Origins, Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, Beijing 100044, China
| | - Tianyi Wang
- Key Laboratory of Vertebrate Evolution and Human Origins, Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, Beijing 100044, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Ruowei Yang
- Key Laboratory of Vertebrate Evolution and Human Origins, Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, Beijing 100044, China
| | - Wanjing Ping
- Key Laboratory of Vertebrate Evolution and Human Origins, Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, Beijing 100044, China
| | - Ming Zhang
- School of Cultural Heritage, Northwest University, Xi'an, Shaanxi 710069, China
| | - Xing Gao
- Key Laboratory of Vertebrate Evolution and Human Origins, Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, Beijing 100044, China
| | - Yichen Liu
- Key Laboratory of Vertebrate Evolution and Human Origins, Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, Beijing 100044, China.
| | - Wenjun Wang
- Key Laboratory of Vertebrate Evolution and Human Origins, Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, Beijing 100044, China; Science and Technology Archaeology, National Centre for Archaeology, Beijing 100013, China.
| | - Qiaomei Fu
- Key Laboratory of Vertebrate Evolution and Human Origins, Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, Beijing 100044, China; University of Chinese Academy of Sciences, Beijing 100049, China; Shanghai Qi Zhi Institute, Shanghai 200232, China.
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15
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Lin YP, Chen HW, Yeh PM, Anand SS, Lin J, Li J, Noble T, Nair R, Schafleitner R, Samsononova M, Bishop-von-Wettberg E, Nuzhdin S, Ting CT, Lawn RJ, Lee CR. Demographic history and distinct selection signatures of two domestication genes in mungbean. PLANT PHYSIOLOGY 2023; 193:1197-1212. [PMID: 37335936 DOI: 10.1093/plphys/kiad356] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2023] [Revised: 05/10/2023] [Accepted: 06/03/2023] [Indexed: 06/21/2023]
Abstract
Domestication is the long and complex process underlying the evolution of crops, in which artificial directional selection transformed wild progenitors into the desired form, affecting genomic variation and leaving traces of selection at targeted loci. However, whether genes controlling important domestication traits follow the same evolutionary pattern expected under the standard selective sweep model remains unclear. With whole-genome resequencing of mungbean (Vigna radiata), we investigated this issue by resolving its global demographic history and targeted dissection of the molecular footprints of genes underlying 2 key traits representing different stages of domestication. Mungbean originated in Asia, and the Southeast Asian wild population migrated to Australia about 50 thousand generations ago. Later in Asia, the cultivated form diverged from the wild progenitor. We identified the gene associated with the pod shattering resistance trait, VrMYB26a, with lower expression across cultivars and reduced polymorphism in the promoter region, reflecting a hard selective sweep. On the other hand, the stem determinacy trait was associated with VrDet1. We found that 2 ancient haplotypes of this gene have lower gene expression and exhibited intermediate frequencies in cultivars, consistent with selection favoring independent haplotypes in a soft selective sweep. In mungbean, contrasting signatures of selection were identified from the detailed dissection of 2 important domestication traits. The results suggest complex genetic architecture underlying the seemingly simple process of directional artificial selection and highlight the limitations of genome-scan methods relying on hard selective sweeps.
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Affiliation(s)
- Ya-Ping Lin
- Institute of Ecology and Evolutionary Biology, National Taiwan University, Taipei 10617, Taiwan
- World Vegetable Center, Tainan 74199, Taiwan
| | - Hung-Wei Chen
- Institute of Ecology and Evolutionary Biology, National Taiwan University, Taipei 10617, Taiwan
| | - Pei-Min Yeh
- Institute of Ecology and Evolutionary Biology, National Taiwan University, Taipei 10617, Taiwan
| | - Shashi S Anand
- Institute of Ecology and Evolutionary Biology, National Taiwan University, Taipei 10617, Taiwan
| | - Jiunn Lin
- Institute of Plant Biology, National Taiwan University, Taipei 10617, Taiwan
| | - Juan Li
- Institute of Ecology and Evolutionary Biology, National Taiwan University, Taipei 10617, Taiwan
- Institute of Ecology and Evolution, University of Bern, 3012 Bern, Switzerland
- Swiss Institute for Bioinformatics, 1015 Lausanne, Switzerland
| | - Thomas Noble
- Australian Department of Agriculture and Fisheries, Warwick, Queensland 4370, Australia
| | - Ramakrishnan Nair
- World Vegetable Center South and Central Asia, ICRISAT Campus, Patancheru, Hyderabad, Telangana 502324, India
| | | | - Maria Samsononova
- Mathematical Biology and Bioinformatics Laboratory, Peter the Great St. Petersburg Polytechnic University, 19525 St. Petersburg, Russia
| | - Eric Bishop-von-Wettberg
- Mathematical Biology and Bioinformatics Laboratory, Peter the Great St. Petersburg Polytechnic University, 19525 St. Petersburg, Russia
- Department of Plant and Soil Science and Gund Institute for the Environment, University of Vermont, Burlington, VT 05405, USA
| | - Sergey Nuzhdin
- Department of Biological Sciences, University of Southern California, Los Angeles, CA 90089, USA
| | - Chau-Ti Ting
- Department of Life Science, National Taiwan University, Taipei 10617, Taiwan
| | - Robert J Lawn
- College of Science & Engineering, James Cook University, Townsville, Queensland 4814, Australia
| | - Cheng-Ruei Lee
- Institute of Ecology and Evolutionary Biology, National Taiwan University, Taipei 10617, Taiwan
- Institute of Plant Biology, National Taiwan University, Taipei 10617, Taiwan
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16
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Qiu M, Liu R, Li X, Du L, Ruan Q, Pollard AM, Zhang S, Yuan X, Liu F, Li G, Li G, Jiao Z, Luo J, Chen S, Yang X, Wang Y, Han J, Chen F, Dong G. Earliest systematic coal exploitation for fuel extended to ~3600 B.P. SCIENCE ADVANCES 2023; 9:eadh0549. [PMID: 37494433 PMCID: PMC10371010 DOI: 10.1126/sciadv.adh0549] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/09/2023] [Accepted: 06/22/2023] [Indexed: 07/28/2023]
Abstract
Coal has long fueled human civilizations. The history of systematic coal fuel exploitation has been traced back to the late third millennium before present (post-2500 B.P.). Although sporadic combustion of coal for fuel was reported in some prehistoric archaeological sites, evidence for the systematic exploitation of coal for fuel before 2500 B.P. remains lacking. Here, we report comprehensive understanding for the earliest systematic exploitation of coal for fuel at the Jirentaigoukou site in Xinjiang, northwestern China, at ~3600 B.P. The main body of the site witnessed systematic exploitation of bituminous coals, illustrating a complete chaîne opératoire with selective mining, planned storage, and extensive combustion. Our results transform the knowledge of energy history by extending the upper limit of the systematic exploitation of coal for fuel by approximately a millennium, and provide a precedent of energy transition under intense conflict between social demand and environmental deterioration.
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Affiliation(s)
- Menghan Qiu
- Key Laboratory of Western China's Environmental Systems (Ministry of Education), College of Earth and Environmental Sciences, Lanzhou University, Lanzhou, China
| | - Ruiliang Liu
- The Department of Asia, British Museum, London, UK
| | - Xingyuan Li
- Key Laboratory of Western China's Environmental Systems (Ministry of Education), College of Earth and Environmental Sciences, Lanzhou University, Lanzhou, China
| | - Linyao Du
- Key Laboratory of Western China's Environmental Systems (Ministry of Education), College of Earth and Environmental Sciences, Lanzhou University, Lanzhou, China
| | - Qiurong Ruan
- Xinjiang Institute of Cultural Relics and Archaeology, Urumqi, China
| | - A Mark Pollard
- Research Laboratory for Archaeology and the History of Art, School of Archaeology, University of Oxford, Oxford, UK
| | - Shanjia Zhang
- Key Laboratory of Western China's Environmental Systems (Ministry of Education), College of Earth and Environmental Sciences, Lanzhou University, Lanzhou, China
| | - Xiao Yuan
- Department of Archaeology and Museum Studies, School of History, Renmin University of China, Beijing, China
| | - Fengwen Liu
- Key Laboratory of Western China's Environmental Systems (Ministry of Education), College of Earth and Environmental Sciences, Lanzhou University, Lanzhou, China
| | - Gang Li
- Key Laboratory of Western China's Environmental Systems (Ministry of Education), College of Earth and Environmental Sciences, Lanzhou University, Lanzhou, China
| | - Gaojun Li
- Key Laboratory of Surficial Geochemistry (Ministry of Education), Department of Earth and Planetary Sciences, Nanjing University, Nanjing, China
| | - Zhimin Jiao
- Key Laboratory of Surficial Geochemistry (Ministry of Education), Department of Earth and Planetary Sciences, Nanjing University, Nanjing, China
| | - Jiaming Luo
- Xinjiang Institute of Cultural Relics and Archaeology, Urumqi, China
| | - Shengqian Chen
- Alpine Paleoecology and Human Adaptation Group (ALPHA), State Key Laboratory of Tibetan Plateau Earth System, Environment and Resources (TPESER), Institute of Tibetan Plateau Research (ITPCAS), Chinese Academy of Sciences (CAS), Beijing, China
| | - Xiaoyan Yang
- Key Laboratory of Western China's Environmental Systems (Ministry of Education), College of Earth and Environmental Sciences, Lanzhou University, Lanzhou, China
| | - Yongqiang Wang
- Xinjiang Institute of Cultural Relics and Archaeology, Urumqi, China
| | - Jianye Han
- Department of Archaeology and Museum Studies, School of History, Renmin University of China, Beijing, China
| | - Fahu Chen
- Key Laboratory of Western China's Environmental Systems (Ministry of Education), College of Earth and Environmental Sciences, Lanzhou University, Lanzhou, China
- Alpine Paleoecology and Human Adaptation Group (ALPHA), State Key Laboratory of Tibetan Plateau Earth System, Environment and Resources (TPESER), Institute of Tibetan Plateau Research (ITPCAS), Chinese Academy of Sciences (CAS), Beijing, China
| | - Guanghui Dong
- Key Laboratory of Western China's Environmental Systems (Ministry of Education), College of Earth and Environmental Sciences, Lanzhou University, Lanzhou, China
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17
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Simmer RA, Jansen EJ, Patterson KJ, Schnoor JL. Climate Change and the Sea: A Major Disruption in Steady State and the Master Variables. ACS ENVIRONMENTAL AU 2023; 3:195-208. [PMID: 37483305 PMCID: PMC10360203 DOI: 10.1021/acsenvironau.2c00061] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/15/2022] [Revised: 03/31/2023] [Accepted: 04/03/2023] [Indexed: 07/25/2023]
Abstract
Since the beginning of the industrial revolution, humans have burned enormous quantities of coal, oil, and natural gas, rivaling nature's elemental cycles of C, N, and S. The result has been a disruption in a steady state of CO2 and other greenhouse gases in the atmosphere, a warming of the planet, and changes in master variables (temperature, pH, and pε) of the sea affecting critical physical, chemical, and biological reactions. Humans have also produced copious quantities of N and P fertilizers producing widespread coastal hypoxia and low dissolved oxygen conditions, which now threaten even the open ocean. Consequently, our massive alteration of state variables diminishes coral reefs, fisheries, and marine ecosystems, which are the foundation of life on Earth. We point to a myriad of actions and alternatives which will help to stem the tide of climate change and its effects on the sea while, at the same time, creating a more sustainable future for humans and ecosystems alike.
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Affiliation(s)
- Reid A. Simmer
- Department
of Civil and Environmental Engineering, IIHR Hydroscience & Engineering, The University of Iowa, Iowa City, Iowa 52242, United States
| | - Emily J. Jansen
- Department
of Civil and Environmental Engineering, IIHR Hydroscience & Engineering, The University of Iowa, Iowa City, Iowa 52242, United States
| | - Kyle J. Patterson
- Department
of Civil and Environmental Engineering, IIHR Hydroscience & Engineering, The University of Iowa, Iowa City, Iowa 52242, United States
| | - Jerald L. Schnoor
- Department
of Civil and Environmental Engineering, IIHR Hydroscience & Engineering, The University of Iowa, Iowa City, Iowa 52242, United States
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18
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Gischler E, Hudson JH, Eisenhauer A, Parang S, Deveaux M. 9000 years of change in coral community structure and accretion in Belize reefs, western Atlantic. Sci Rep 2023; 13:11349. [PMID: 37443199 PMCID: PMC10345111 DOI: 10.1038/s41598-023-38118-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2022] [Accepted: 07/03/2023] [Indexed: 07/15/2023] Open
Abstract
Tropical coral reefs, as prominent marine diversity hotspots, are in decline, and long-term studies help to improve understanding of the effects of global warming, sea-level rise, ocean acidification, deterioration of water quality, and disease. Here, we evaluated relative coral abundance and reef accretion rates over the past 9000 years in Belize barrier and atoll reefs, the largest reef system in the Atlantic Ocean. Acropora palmata and Orbicella spp. have been the most common corals. The abundance of competitive, fast-growing acroporids was constant over multi-millennial timescales. A decline in A. cervicornis abundance, however, and three centennial-scale gaps in A. palmata occurrence, suggest that the modern decline in acroporids was not unprecedented. Stress-tolerant corals predominate at the beginning of Holocene successions. Following the improvement of environmental conditions after inundation of the reef pedestal, their abundance has decreased. The abundance of weedy corals has increased during the Holocene underlining the importance of fecundity for the coral community. Reef-accretion rate, as calculated based on 76 new U-series age dates, has decreased over the Holocene and the mean value of 3.36 m kyr-1 is at the lower end of global reef growth compilations and predicted future rates of rise in sea level.
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Affiliation(s)
- Eberhard Gischler
- Institute of Geosciences, Goethe-University, 60438, Frankfurt am Main, Germany.
| | | | | | - Soran Parang
- Department of Earth and Environmental Sciences, University of Ottawa, Ottawa, ON, K1N 6N5, Canada
| | - Michael Deveaux
- GSI Helmholtz Center of Heavy Ion Research, 64291, Darmstadt, Germany
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19
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Xiang L, Huang X, Sun M, Panizzo VN, Huang C, Zheng M, Chen X, Chen F. Prehistoric population expansion in Central Asia promoted by the Altai Holocene Climatic Optimum. Nat Commun 2023; 14:3102. [PMID: 37248221 DOI: 10.1038/s41467-023-38828-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2022] [Accepted: 05/17/2023] [Indexed: 05/31/2023] Open
Abstract
How climate change in the middle to late Holocene has influenced the early human migrations in Central Asian Steppe remains poorly understood. To address this issue, we reconstructed a multiproxy-based Holocene climate history from the sediments of Kanas Lake and neighboring Tiewaike Lake in the southern Altai Mountains. The results show an exceptionally warm climate during ~6.5-3.6 kyr is indicated by the silicon isotope composition of diatom silica (δ30Sidiatom) and the biogenic silica (BSi) content. During 4.7-4.3 kyr, a peak in δ30Sidiatom reflects enhanced lake thermal stratification and periodic nutrient limitation as indicated by concomitant decreasing BSi content. Our geochemical results indicate a significantly warm and wet climate in the Altai Mountain region during 6.5-3.6 kyr, corresponding to the Altai Holocene Climatic Optimum (AHCO), which is critical for promoting prehistoric human population expansion and intensified cultural exchanges across the Central Asian steppe during the Bronze Age.
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Affiliation(s)
- Lixiong Xiang
- Key Laboratory of Western China's Environmental Systems (Ministry of Education), College of Earth and Environmental Sciences, Lanzhou University, 730000, Lanzhou, China
| | - Xiaozhong Huang
- Key Laboratory of Western China's Environmental Systems (Ministry of Education), College of Earth and Environmental Sciences, Lanzhou University, 730000, Lanzhou, China.
| | - Mingjie Sun
- Key Laboratory of Western China's Environmental Systems (Ministry of Education), College of Earth and Environmental Sciences, Lanzhou University, 730000, Lanzhou, China
- Centre for Environmental Geochemistry, School of Geography, University of Nottingham, Nottingham, NG7 2RD, UK
| | - Virginia N Panizzo
- Centre for Environmental Geochemistry, School of Geography, University of Nottingham, Nottingham, NG7 2RD, UK.
| | - Chong Huang
- Key Laboratory of Western China's Environmental Systems (Ministry of Education), College of Earth and Environmental Sciences, Lanzhou University, 730000, Lanzhou, China
| | - Min Zheng
- Key Laboratory of Western China's Environmental Systems (Ministry of Education), College of Earth and Environmental Sciences, Lanzhou University, 730000, Lanzhou, China
| | - Xuemei Chen
- Northwest Institute of Eco-Environmental and Resources, Chinese Academy of Sciences, 730000, Lanzhou, China
| | - Fahu Chen
- Alpine Paleoecology and Human Adaptation Group (ALPHA), Institute of Tibetan Plateau Research, Chinese Academy of Sciences, 100101, Beijing, China
- State Key Laboratory of Tibetan Plateau Earth System, Resources and Environment (TPESRE), 100101, Beijing, China
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20
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Yoshimura M. Hypothesised life cycle adaptation of stonefly (Plecoptera) in response to increased water temperatures. J Therm Biol 2023; 113:103533. [PMID: 37055137 DOI: 10.1016/j.jtherbio.2023.103533] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2022] [Revised: 02/21/2023] [Accepted: 02/22/2023] [Indexed: 03/06/2023]
Abstract
Water temperature is the most important and critical factor for freshwater invertebrates and it fluctuates with an increase in air temperature. In this study, the effect of water temperature on egg development was clarified in Stavsolus japonicus, and the response to climate change in stoneflies with long egg periods were considered. Water temperatures prior to 43 days before hatching likely do not affect egg development in Stavsolus japonicus. Instead, they use egg diapause as an adaptive strategy to survive hot summer conditions. Increased water temperatures may cause migration to higher elevations for stoneflies that have lower adaptability in their egg development period, with populations eventually becoming stranded where no higher elevation or cooler habitat is available. Species extinction is expected to increase with increasing temperatures, leading to reduced biodiversity in many ecosystems. Indirect effects of water warming on maturation and reproduction may lead to substantial reductions in benthic invertebrate populations.
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Affiliation(s)
- Mayumi Yoshimura
- Kansai Research Center, Forestry and Forest Products Research Institute, Nagaikyutaro 68, Momoyama, Fushimi, Kyoto, 612-0855, Japan.
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21
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Chen A, Yang L, Sun L, Gao Y, Xie Z. Holocene changes in biomass burning in the boreal Northern Hemisphere, reconstructed from anhydrosugar fluxes in an Arctic sediment profile. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 867:161460. [PMID: 36626988 DOI: 10.1016/j.scitotenv.2023.161460] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2022] [Revised: 01/01/2023] [Accepted: 01/04/2023] [Indexed: 06/17/2023]
Abstract
The rapid warming of Arctic is causing increased fire activities in the boreal Northern Hemisphere (NH), leading to unprecedent changes in the global carbon cycling, human health and ecosystems. Understanding the interaction between fire and climate in this far north region is crucial for predicting future changes of wildfires. However, fire records over geological time scales are still scarce in the high latitudes of NH to provide comprehensive pictures of the fire history in this region. Here, we used the flux of levoglucosan (Lev) and its isomers in a sediment profile YN from Svalbard, high Arctic, as proxies for the changes in biomass burning from ∼9-2 kyr BP (thousand years before present). Backward trajectories and comparison with charcoal syntheses from various regions confirmed that the Lev transport to the profile site is sourced from the fire activities in the boreal NH, especially in northern Europe and northern Siberia. The Lev flux exhibited a slight overall decreasing trend at ∼3 %/kyr (p = 0.09) over the study period, as well as centennial maxima at ∼9, 8-7, 6, 5, and 4-3 kyr BP (p = 0.06). On sub-orbital scales, the long-term decrease in fire activities corresponded to trends of summer temperature in the extratropics of the NH (p = 0.01, r = 0.42), reflecting their regulation of fuel availability and flammability. On centennial to sub-millennial time scales, high levels of biomass burning were associated with periods of increased North Atlantic ice-rafted debris (p = 0.02, r = 0.38), which were indicative of cold and dry conditions over most of the source regions, reflecting the impacts of dryness on fuel flammability. The results suggested that enhanced Arctic amplification on centennial time scales may reduce biomass burning in most of the boreal NH, although fires in some mid-latitude regions may be facilitated.
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Affiliation(s)
- Afeng Chen
- Institute of Polar Environment & Anhui Key Laboratory of Polar Environment and Global Change, Department of Environmental Science and Engineering, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Lianjiao Yang
- Institute of Polar Environment & Anhui Key Laboratory of Polar Environment and Global Change, Department of Environmental Science and Engineering, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Liguang Sun
- Institute of Polar Environment & Anhui Key Laboratory of Polar Environment and Global Change, Department of Environmental Science and Engineering, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Yuesong Gao
- Institute of Polar Environment & Anhui Key Laboratory of Polar Environment and Global Change, Department of Environmental Science and Engineering, University of Science and Technology of China, Hefei, Anhui 230026, China.
| | - Zhouqing Xie
- Institute of Polar Environment & Anhui Key Laboratory of Polar Environment and Global Change, Department of Environmental Science and Engineering, University of Science and Technology of China, Hefei, Anhui 230026, China.
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22
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Peng H, Rong Y, Chen D, Sun R, Huang J, Ding H, Olid C, Yan H. Anthropogenic activity and millennial climate variability affect Holocene mercury deposition of an alpine wetland near the largest mercury mine in China. CHEMOSPHERE 2023; 316:137855. [PMID: 36642145 DOI: 10.1016/j.chemosphere.2023.137855] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/10/2022] [Revised: 01/09/2023] [Accepted: 01/11/2023] [Indexed: 06/17/2023]
Abstract
Mercury (Hg) is a potentially toxic element that can be transported globally through the atmosphere, once deposited in the environment, has strong bioaccumulation and extreme toxicity in food webs, especially in wetland ecosystems. Anthropogenic Hg emissions have enhanced Hg deposition by 3-5 times since the industrial revolution, and the mining and smelting of Hg ore are important emission sources. However, the dynamics in Hg deposition around the largest Hg mine in China before the industrial revolution and their driving forces remain poorly explored. Here we reconstruct the atmospheric Hg depositional fluxes (named here Hg influx (Hginflux)) during the Holocene using a 450-cm alpine wetland sediment core taken from the Jiulongchi wetland, which is only 65 km to the Wanshan Mercury Mine. Our record shows an abrupt rapid increase in Hg concentration since 2500 cal yr BP, suggesting that Hg mining in southwest China may have started before the establishment of the Qin dynasty. Two major Hginflux peaks were found during the periods 10,000-6000 and 6000 - 3800 cal yr BP, with an increase in Hg deposition by a factor of 4-8. These two peaks are also found in other terrestrial archives from several sites across the Northern Hemisphere. We speculate that critical millennial-scale climate changes, i.e., the Holocene Climatic Optimum (HCO) and the Mid-Holocene Transition (MHT), were the potential triggers of these two Hginflux peaks. This study highlights the importance of climatic variability and local Hg mining in controlling atmospheric Hg deposition during the Holocene.
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Affiliation(s)
- Haijun Peng
- State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550081, China; CAS Center for Excellence in Quaternary Science and Global Change, Xi'an, 710061, China.
| | - Yimeng Rong
- State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550081, China; State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550081, China; University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Di Chen
- State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550081, China; University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Ruiyang Sun
- State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550081, China; State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550081, China; University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Jie Huang
- Key Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing, 100101, China
| | - Hanwei Ding
- State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550081, China; University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Carolina Olid
- UB-Geomodels Research Institute, Departament de Dinàmica de la Terra i l'Oceà, Facultat de Ciències de la Terra, Universitat de Barcelona, Barcelona, 08028, Spain
| | - Haiyu Yan
- State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550081, China
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23
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Out-of-phase relationship of Holocene moisture variations between the northeastern and southeastern Tibetan Plateau and its societal impacts. FUNDAMENTAL RESEARCH 2023. [DOI: 10.1016/j.fmre.2023.02.014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/09/2023] Open
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24
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Lin X, Wu B, Wang J, Wang G, Chen Z, Liang Y, Liu J, Wang H. Effects of Geographical and Climatic Factors on the Intrinsic Water Use Efficiency of Tropical Plants: Evidence from Leaf 13C. PLANTS (BASEL, SWITZERLAND) 2023; 12:951. [PMID: 36840299 PMCID: PMC9962877 DOI: 10.3390/plants12040951] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/19/2022] [Revised: 02/11/2023] [Accepted: 02/13/2023] [Indexed: 06/18/2023]
Abstract
Understanding the water use efficiency (WUE) and adaptation strategies of plants in high-temperature and rainy areas is essential under global climate change. The leaf carbon content (LCC) and intrinsic WUE of 424 plant samples (from 312 plant species) on Hainan Island were measured to examine their relationship with geographical and climatic factors in herbs, trees, vines and ferns. The LCC ranged from 306.30 to 559.20 mg g-1, with an average of 418.85 mg g-1, and decreased with increasing mean annual temperature (MAT). The range of intrinsic WUE was 8.61 to 123.39 μmol mol-1 with an average value of 60.66 μmol mol-1. The intrinsic WUE decreased with increasing altitude and relative humidity (RH) and wind speed (WS), but increased with increasing latitude, MAT and rainy season temperature (RST), indicating that geographical and climatic factors affect the intrinsic WUE. Stepwise regression suggested that in tropical regions with high temperature and humidity, the change in plant intrinsic WUE was mainly driven by WS. In addition, the main factors affecting the intrinsic WUE of different plant functional types of plants are unique, implying that plants of different plant functional types have distinctive adaptive strategies to environmental change. The present study may provide an insight in water management in tropical rainforest.
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Affiliation(s)
- Xiaoyan Lin
- School of Forestry, Hainan University, Haikou 570228, China
- Rubber Research Institute, Chinese Academy of Tropical Agricultural Sciences, Haikou 571101, China
- Opening Project Fund of Key Laboratory of Biology and Genetic Resources of Rubber Tree/State Key Laboratory Breeding Base of Cultivation and Physiology for Tropical Crops/Danzhou Investigation and Experiment Station of Tropical Crops, Ministry of Agriculture and Rural Affairs, Danzhou 571700, China
| | - Bingsun Wu
- Rubber Research Institute, Chinese Academy of Tropical Agricultural Sciences, Haikou 571101, China
- Opening Project Fund of Key Laboratory of Biology and Genetic Resources of Rubber Tree/State Key Laboratory Breeding Base of Cultivation and Physiology for Tropical Crops/Danzhou Investigation and Experiment Station of Tropical Crops, Ministry of Agriculture and Rural Affairs, Danzhou 571700, China
| | - Jingjing Wang
- School of Forestry, Hainan University, Haikou 570228, China
- Opening Project Fund of Key Laboratory of Biology and Genetic Resources of Rubber Tree/State Key Laboratory Breeding Base of Cultivation and Physiology for Tropical Crops/Danzhou Investigation and Experiment Station of Tropical Crops, Ministry of Agriculture and Rural Affairs, Danzhou 571700, China
| | - Guoan Wang
- Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, Department of Environmental Sciences and Engineering, College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China
| | - Zixun Chen
- Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, Department of Environmental Sciences and Engineering, College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China
| | - Yongyi Liang
- School of Forestry, Hainan University, Haikou 570228, China
- Rubber Research Institute, Chinese Academy of Tropical Agricultural Sciences, Haikou 571101, China
| | - Jiexi Liu
- School of Forestry, Hainan University, Haikou 570228, China
- National Key Laboratory of Plant Molecular Genetics, CAS Center for Excellence in Molecular Plant Sciences, Institutes of Plant Physiology and Ecology, Shanghai 200032, China
| | - Hao Wang
- School of Forestry, Hainan University, Haikou 570228, China
- College of International Studies, Yangzhou University, Yangzhou 225009, China
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25
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Kaufman DS, Broadman E. Revisiting the Holocene global temperature conundrum. Nature 2023; 614:425-435. [PMID: 36792734 DOI: 10.1038/s41586-022-05536-w] [Citation(s) in RCA: 13] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2021] [Accepted: 11/07/2022] [Indexed: 02/17/2023]
Abstract
Recent global temperature reconstructions for the current interglacial period (the Holocene, beginning 11,700 years ago) have generated contrasting trends. This Review examines evidence from indicators and drivers of global change, as inferred from proxy records and simulated by climate models, to evaluate whether anthropogenic global warming was preceded by a long-term warming trend or by global cooling. Multimillennial-scale cooling before industrialization requires extra climate forcing and major climate feedbacks that are not well represented in most climate models at present. Conversely, global warming before industrialization challenges proxy-based reconstructions of past climate. The resolution of this conundrum has implications for contextualizing post-industrial warming and for understanding climate sensitivity to several forcings and their attendant feedbacks, including greenhouse gases. From a large variety of available evidence, we find support for a relatively mild millennial-scale global thermal maximum during the mid-Holocene, but more research is needed to firmly resolve the conundrum and to advance our understanding of slow-moving climate variability.
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Affiliation(s)
- Darrell S Kaufman
- School of Earth and Sustainability, Northern Arizona University, Flagstaff, AZ, USA.
| | - Ellie Broadman
- School of Earth and Sustainability, Northern Arizona University, Flagstaff, AZ, USA
- Laboratory of Tree-Ring Research, University of Arizona, Tucson, AZ, USA
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26
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Nwosu EC, Brauer A, Monchamp ME, Pinkerneil S, Bartholomäus A, Theuerkauf M, Schmidt JP, Stoof-Leichsenring KR, Wietelmann T, Kaiser J, Wagner D, Liebner S. Early human impact on lake cyanobacteria revealed by a Holocene record of sedimentary ancient DNA. Commun Biol 2023; 6:72. [PMID: 36653523 PMCID: PMC9849356 DOI: 10.1038/s42003-023-04430-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2022] [Accepted: 01/05/2023] [Indexed: 01/19/2023] Open
Abstract
Sedimentary DNA-based studies revealed the effects of human activity on lake cyanobacteria communities over the last centuries, yet we continue to lack information over longer timescales. Here, we apply high-resolution molecular analyses on sedimentary ancient DNA to reconstruct the history of cyanobacteria throughout the Holocene in a lake in north-eastern Germany. We find a substantial increase in cyanobacteria abundance coinciding with deforestation during the early Bronze Age around 4000 years ago, suggesting increased nutrient supply to the lake by local communities settling on the lakeshore. The next substantial human-driven increase in cyanobacteria abundance occurred only about a century ago due to intensified agricultural fertilisation which caused the dominance of potentially toxic taxa (e.g., Aphanizomenon). Our study provides evidence that humans began to locally impact lake ecology much earlier than previously assumed. Consequently, managing aquatic systems today requires awareness of the legacy of human influence dating back potentially several millennia.
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Affiliation(s)
- Ebuka Canisius Nwosu
- grid.23731.340000 0000 9195 2461GFZ German Research Centre for Geosciences, Section Geomicrobiology, 14473 Potsdam, Germany
| | - Achim Brauer
- grid.23731.340000 0000 9195 2461GFZ German Research Centre for Geosciences, Section Climate Dynamics and Landscape Evolution, 14473 Potsdam, Germany ,grid.11348.3f0000 0001 0942 1117Institute of Geosciences, University of Potsdam, 14476 Potsdam, Germany
| | - Marie-Eve Monchamp
- grid.14709.3b0000 0004 1936 8649Department of Biology, McGill University, Montreal, QC H3A 1B1 Canada ,Groupe de Recherche Interuniversitaire en Limnologie (GRIL), Montreal, QC, H3A 1B1 Canada
| | - Sylvia Pinkerneil
- grid.23731.340000 0000 9195 2461GFZ German Research Centre for Geosciences, Section Climate Dynamics and Landscape Evolution, 14473 Potsdam, Germany
| | - Alexander Bartholomäus
- grid.23731.340000 0000 9195 2461GFZ German Research Centre for Geosciences, Section Geomicrobiology, 14473 Potsdam, Germany
| | - Martin Theuerkauf
- grid.5603.0Institute of Botany and Landscape Ecology, University of Greifswald, 17489 Greifswald, Germany
| | - Jens-Peter Schmidt
- State Authority for Culture and Preservation of Monuments of Mecklenburg and Western Pomerania, State Archaeology, 19055 Schwerin, Germany
| | - Kathleen R. Stoof-Leichsenring
- grid.10894.340000 0001 1033 7684Polar Terrestrial Environmental System, Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, 14473 Potsdam, Germany
| | - Theresa Wietelmann
- grid.10894.340000 0001 1033 7684Polar Terrestrial Environmental System, Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, 14473 Potsdam, Germany
| | - Jerome Kaiser
- grid.423940.80000 0001 2188 0463Leibniz Institute for Baltic Sea Research, 18119 Rostock-Warnemünde, Germany
| | - Dirk Wagner
- grid.23731.340000 0000 9195 2461GFZ German Research Centre for Geosciences, Section Geomicrobiology, 14473 Potsdam, Germany ,grid.11348.3f0000 0001 0942 1117Institute of Geosciences, University of Potsdam, 14476 Potsdam, Germany
| | - Susanne Liebner
- grid.23731.340000 0000 9195 2461GFZ German Research Centre for Geosciences, Section Geomicrobiology, 14473 Potsdam, Germany ,grid.11348.3f0000 0001 0942 1117Institute of Biochemistry and Biology, University of Potsdam, 14476 Potsdam, Germany
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27
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Jones TR, Cuffey KM, Roberts WHG, Markle BR, Steig EJ, Stevens CM, Valdes PJ, Fudge TJ, Sigl M, Hughes AG, Morris V, Vaughn BH, Garland J, Vinther BM, Rozmiarek KS, Brashear CA, White JWC. Seasonal temperatures in West Antarctica during the Holocene. Nature 2023; 613:292-297. [PMID: 36631651 PMCID: PMC9834049 DOI: 10.1038/s41586-022-05411-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2021] [Accepted: 10/04/2022] [Indexed: 01/13/2023]
Abstract
The recovery of long-term climate proxy records with seasonal resolution is rare because of natural smoothing processes, discontinuities and limitations in measurement resolution. Yet insolation forcing, a primary driver of multimillennial-scale climate change, acts through seasonal variations with direct impacts on seasonal climate1. Whether the sensitivity of seasonal climate to insolation matches theoretical predictions has not been assessed over long timescales. Here, we analyse a continuous record of water-isotope ratios from the West Antarctic Ice Sheet Divide ice core to reveal summer and winter temperature changes through the last 11,000 years. Summer temperatures in West Antarctica increased through the early-to-mid-Holocene, reached a peak 4,100 years ago and then decreased to the present. Climate model simulations show that these variations primarily reflect changes in maximum summer insolation, confirming the general connection between seasonal insolation and warming and demonstrating the importance of insolation intensity rather than seasonally integrated insolation or season duration2,3. Winter temperatures varied less overall, consistent with predictions from insolation forcing, but also fluctuated in the early Holocene, probably owing to changes in meridional heat transport. The magnitudes of summer and winter temperature changes constrain the lowering of the West Antarctic Ice Sheet surface since the early Holocene to less than 162 m and probably less than 58 m, consistent with geological constraints elsewhere in West Antarctica4-7.
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Affiliation(s)
- Tyler R Jones
- Institute of Arctic and Alpine Research, University of Colorado, Boulder, CO, USA.
| | - Kurt M Cuffey
- Department of Geography, University of California, Berkeley, CA, USA
| | - William H G Roberts
- Geography and Environmental Sciences, Northumbria University, Newcastle-upon-Tyne, UK
| | - Bradley R Markle
- Institute of Arctic and Alpine Research, University of Colorado, Boulder, CO, USA.,Department of Geological Sciences, University of Colorado, Boulder, CO, USA
| | - Eric J Steig
- Department of Earth and Space Sciences, University of Washington, Seattle, WA, USA
| | - C Max Stevens
- Cryospheric Science Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD, USA.,Earth System Science Interdisciplinary Center, University of Maryland, College Park, MD, USA
| | - Paul J Valdes
- School of Geographical Sciences, University of Bristol, Bristol, UK
| | - T J Fudge
- Department of Earth and Space Sciences, University of Washington, Seattle, WA, USA
| | - Michael Sigl
- Climate and Environmental Physics, Physics Institute & Oeschger Centre for Climate Change Research, University of Bern, Bern, Switzerland
| | - Abigail G Hughes
- Institute of Arctic and Alpine Research, University of Colorado, Boulder, CO, USA.,Department of Geological Sciences, University of Colorado, Boulder, CO, USA
| | - Valerie Morris
- Institute of Arctic and Alpine Research, University of Colorado, Boulder, CO, USA
| | - Bruce H Vaughn
- Institute of Arctic and Alpine Research, University of Colorado, Boulder, CO, USA
| | - Joshua Garland
- Center on Narrative, Disinformation and Strategic Influence, Arizona State University, Tempe, AZ, USA
| | - Bo M Vinther
- Centre for Ice and Climate, Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark
| | - Kevin S Rozmiarek
- Institute of Arctic and Alpine Research, University of Colorado, Boulder, CO, USA.,Department of Geological Sciences, University of Colorado, Boulder, CO, USA
| | - Chloe A Brashear
- Institute of Arctic and Alpine Research, University of Colorado, Boulder, CO, USA.,Department of Geological Sciences, University of Colorado, Boulder, CO, USA
| | - James W C White
- College of Arts and Sciences, University of North Carolina, Chapel Hill, NC, USA
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28
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Hébert R, Herzschuh U, Laepple T. Millennial-scale climate variability over land overprinted by ocean temperature fluctuations. NATURE GEOSCIENCE 2022; 15:899-905. [PMID: 36817575 PMCID: PMC7614181 DOI: 10.1038/s41561-022-01056-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/16/2021] [Accepted: 09/22/2022] [Indexed: 06/18/2023]
Abstract
Variations in regional temperature have widespread implications for society, but our understanding of the amplitude and origin of long-term natural variability is insufficient for accurate regional projections. This is especially the case for terrestrial temperature variability, which is currently thought to be weak over long timescales. By performing spectral analysis on climate reconstructions, produced using sedimentary pollen records from the Northern Hemisphere over the last 8,000 years, coupled with instrumental data, we provide a comprehensive estimate of regional temperature variability from annual to millennial timescales. We show that short-term random variations are overprinted by strong ocean-driven climate variability on multi-decadal and longer timescales. This may cause substantial and potentially unpredictable regional climatic shifts in the coming century, in contrast to the relatively muted and homogeneous warming projected by climate models. Due to the marine influence, regions characterized by stable oceanic climate at sub-decadal timescales experience stronger long-term variability, and continental regions with higher sub-decadal variability show weaker long-term variability. This fundamental relationship between the timescales provides a unique insight into the emergence of a marine-driven low-frequency regime governing terrestrial climate variability and sets the basis to project the amplitude of temperature fluctuations on multi-decadal timescales and longer.
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Affiliation(s)
- R. Hébert
- Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Potsdam, Germany
- Institute of Geosciences, University of Potsdam, Potsdam, Germany
| | - U. Herzschuh
- Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Potsdam, Germany
- Institute of Geosciences, University of Potsdam, Potsdam, Germany
- Institute of Biochemistry and Biology, University of Potsdam, Potsdam, Germany
| | - T. Laepple
- Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Potsdam, Germany
- University of Bremen, MARUM – Center for Marine Environmental Sciences and Faculty of Geosciences, Bremen, Germany
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29
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Boisvert‐Marsh L, Pedlar JH, de Blois S, Le Squin A, Lawrence K, McKenney DW, Williams C, Aubin I. Migration‐based simulations for Canadian trees show limited tracking of suitable climate under climate change. DIVERS DISTRIB 2022. [DOI: 10.1111/ddi.13630] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
Affiliation(s)
- Laura Boisvert‐Marsh
- Great Lakes Forestry Centre, Canadian Forest Service Natural Resources Canada Sault Ste Marie Ontario Canada
- Department of Plant Science Macdonald Campus of McGill University Ste‐Anne‐de‐Bellevue Quebec Canada
| | - John H. Pedlar
- Great Lakes Forestry Centre, Canadian Forest Service Natural Resources Canada Sault Ste Marie Ontario Canada
| | - Sylvie de Blois
- Department of Plant Science Macdonald Campus of McGill University Ste‐Anne‐de‐Bellevue Quebec Canada
- Bieler School of Environment McGill University Montreal Quebec Canada
| | - Amael Le Squin
- Département de Biologie Université de Sherbrooke Sherbrooke Quebec Canada
| | - Kevin Lawrence
- Great Lakes Forestry Centre, Canadian Forest Service Natural Resources Canada Sault Ste Marie Ontario Canada
| | - Daniel W. McKenney
- Great Lakes Forestry Centre, Canadian Forest Service Natural Resources Canada Sault Ste Marie Ontario Canada
| | - Charlene Williams
- Atlantic Forestry Centre, Canadian Forest Service Natural Resources Canada Fredericton New Brunswick Canada
- Vineland Research and Innovation Centre Lincoln Ontario Canada
| | - Isabelle Aubin
- Great Lakes Forestry Centre, Canadian Forest Service Natural Resources Canada Sault Ste Marie Ontario Canada
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30
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Complex spatio-temporal structure of the Holocene Thermal Maximum. Nat Commun 2022; 13:5662. [PMID: 36192420 PMCID: PMC9529938 DOI: 10.1038/s41467-022-33362-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2021] [Accepted: 09/14/2022] [Indexed: 12/05/2022] Open
Abstract
Inconsistencies between Holocene climate reconstructions and numerical model simulations question the robustness of climate models and proxy temperature records. Climate reconstructions suggest an early-middle Holocene Thermal Maximum (HTM) followed by gradual cooling, whereas climate models indicate continuous warming. This discrepancy either implies seasonal biases in proxy-based climate reconstructions, or that the climate model sensitivity to forcings and feedbacks needs to be reevaluated. Here, we analyze a global database of Holocene paleotemperature records to investigate the spatiotemporal structure of the HTM. Continental proxy records at mid and high latitudes of the Northern Hemisphere portray a “classic” HTM (8–4 ka). In contrast, marine proxy records from the same latitudes reveal an earlier HTM (11–7ka), while a clear temperature anomaly is missing in the tropics. The results indicate a heterogeneous response to climate forcing and highlight the lack of globally synchronous HTM. Analysis of the largest available database of Holocene temperature time series covering past 12,000 years reveals complex spatio-temporal trends and challenges the paradigm of a globally synchronous Holocene Thermal Maximum.
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31
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Li R, Li B, Chen W, Liu P, Xie M, Zhang Y, Wang S, Li Y, Dong G. The alteration from agricultural to nomadic regimes resulted in human livelihood transformation in North-Central China during the 12th century: The archaeobotanical evidence. FRONTIERS IN PLANT SCIENCE 2022; 13:978147. [PMID: 36186048 PMCID: PMC9523409 DOI: 10.3389/fpls.2022.978147] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/25/2022] [Accepted: 08/16/2022] [Indexed: 06/16/2023]
Abstract
Human livelihoods provided a crucial economic foundation for social development in ancient times and were influenced by various factors including environmental change, agricultural origin and intensification, as well as long-distance exchange and culinary tradition. The effect of geopolitical change on human subsistence, especially the shifts between agricultural and nomadic regimes, has not been well understood due to the absence of detailed historical records and archaeological evidence. During the 12th century, the control of the Zhengding area in Hebei Province of north-central China changed from the Northern Song (960-1127 CE) to the Jurchen Jin Dynasty (Jin Dynasty; 1115-1234 CE). Recent excavation of the Zhengding Kaiyuan Temple South (ZKS) site in the area provides a rare opportunity to study human livelihood transformation in relation to geopolitical change. In total, 21,588 charred crop caryopses including foxtail millet, wheat, broomcorn millet, hulled barley, and rice, and other carbonized remains including 55.15 g of boiled foxtail millet and 353.5 g of foxtail millet caryopses were identified, and nine AMS 14C dates of crop remains were obtained from the Northern Song and Jin layers at the ZKS site. This revealed that the dominant plant subsistence transformed from wheat to foxtail millet during the change from the Northern Song to the Jin Dynasties in Zhengding area. By comparing with historical documents and paleoclimate records, we propose that this abnormal shift of primary staple food from the relatively high-yield wheat to low-yield foxtail millet was induced by the traditional dietary preference for foxtail millet in the nomadic Jin society. The Jin government levied foxtail millet as taxation and promoted massive immigration from northeastern China to north-central China to consolidate their rule, which resulted in the adoption of foxtail millet as the most important crop in Zhengding area. The advantage for the cultivation of this frost-sensitive crop in north-central China over northeast China was probably enhanced by notable cold events during the 12th century, while the primary influencing factor for the transformation of human livelihoods in north-central China during that period was geopolitics rather than climate change.
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Affiliation(s)
- Ruo Li
- Key Laboratory of Western China’s Environmental Systems (Ministry of Education), College of Earth and Environmental Sciences, Lanzhou University, Lanzhou, China
| | - Bing Li
- School of Geographical Sciences, Hebei Normal University, Shijiazhuang, China
| | - Wei Chen
- Hebei Provincial Institute of Cultural Relics and Archaeology, Shijiazhuang, Hebei, China
| | - Peilun Liu
- Key Laboratory of Western China’s Environmental Systems (Ministry of Education), College of Earth and Environmental Sciences, Lanzhou University, Lanzhou, China
| | - Mingxia Xie
- School of Geographical Sciences, Hebei Normal University, Shijiazhuang, China
| | - Yunqing Zhang
- Hebei Provincial Institute of Cultural Relics and Archaeology, Shijiazhuang, Hebei, China
| | - Sai Wang
- School of Geographical Sciences, Hebei Normal University, Shijiazhuang, China
| | - Yuecong Li
- School of Geographical Sciences, Hebei Normal University, Shijiazhuang, China
- Hebei Key Laboratory of Environmental Change and Ecological Construction, Shijiazhuang, China
| | - Guanghui Dong
- Key Laboratory of Western China’s Environmental Systems (Ministry of Education), College of Earth and Environmental Sciences, Lanzhou University, Lanzhou, China
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32
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Enhanced Arctic sea ice melting controlled by larger heat discharge of mid-Holocene rivers. Nat Commun 2022; 13:5368. [PMID: 36100586 PMCID: PMC9470582 DOI: 10.1038/s41467-022-33106-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2021] [Accepted: 08/30/2022] [Indexed: 11/23/2022] Open
Abstract
Arctic sea ice retreat is linked to extrapolar thermal energy import, while the potential impact of pan-Arctic river heat discharge on sea-ice loss has been unresolved. We reconstructed the Holocene history of Arctic sea ice and Russian pan-Arctic river heat discharge, combining ice-rafted debris records and sedimentation rates from the East Siberian Arctic Shelf with a compilation of published paleoclimate and observational data. In the mid-Holocene, the early summer (June–July) solar insolation was higher than that during the late Holocene, which led to a larger heat discharge of the Russian pan-Arctic rivers and contributed to more Arctic sea ice retreat. This intensified decline of early-summer sea ice accelerated the melting of sea ice throughout the summertime by lowering regional albedos. Our findings highlight the important impact of the larger heat discharge of pan-Arctic rivers, which can reinforce Arctic sea-ice loss in the summer in the context of global warming. Based on marine multiproxy records, a new study outlines the role of larger heat discharge of the pan-Arctic Rivers in determining the pronounced sea ice retreat over the East Siberian Arctic Shelf in the mid-Holocene.
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33
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Zhang W, Wu H, Cheng J, Geng J, Li Q, Sun Y, Yu Y, Lu H, Guo Z. Holocene seasonal temperature evolution and spatial variability over the Northern Hemisphere landmass. Nat Commun 2022; 13:5334. [PMID: 36088463 PMCID: PMC9464234 DOI: 10.1038/s41467-022-33107-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2021] [Accepted: 08/30/2022] [Indexed: 11/09/2022] Open
Abstract
The origin of the temperature divergence between Holocene proxy reconstructions and model simulations remains controversial, but it possibly results from potential biases in the seasonality of reconstructions or in the climate sensitivity of models. Here we present an extensive dataset of Holocene seasonal temperatures reconstructed using 1310 pollen records covering the Northern Hemisphere landmass. Our results indicate that both summer and winter temperatures warmed from the early to mid-Holocene (~11–7 ka BP) and then cooled thereafter, but with significant spatial variability. Strong early Holocene warming trend occurred mainly in Europe, eastern North America and northern Asia, which can be generally captured by model simulations and is likely associated with the retreat of continental ice sheets. The subsequent cooling trend is pervasively recorded except for northern Asia and southeastern North America, which may reflect the cross-seasonal impact of the decreasing summer insolation through climatic feedbacks, but the cooling in winter season is not well reproduced by climate models. Our results challenge the proposal that seasonal biases in proxies are the main origin of model–data discrepancies and highlight the critical impact of insolation and associated feedbacks on temperature changes, which warrant closer attention in future climate modelling. The study reconstructed Holocene seasonal temperatures using 1,310 pollen records covering the Northern Hemisphere landmass, and show that both summer and winter temperatures peaked at ~7 ka BP, but with significant spatial variability.
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34
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Dong Y, Wu N, Li F, Zhang D, Zhang Y, Shen C, Lu H. The Holocene temperature conundrum answered by mollusk records from East Asia. Nat Commun 2022; 13:5153. [PMID: 36055986 PMCID: PMC9440108 DOI: 10.1038/s41467-022-32506-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2021] [Accepted: 08/02/2022] [Indexed: 11/09/2022] Open
Abstract
Seasonal biases (the warm-season contribution) of Holocene mean annual temperature (MAT) reconstructions from geological records were proposed as a possible cause of the mismatch with climate simulated temperature. Here we analyze terrestrial mollusk assemblages that best reflect seasonal signals and provide quantitative MAT and four-season temperature records for northern China during the past 20,000 years. The MAT estimated from the seasonal temperatures of a four-season-mean based on mollusks shows a peak during ~9000-4000 years ago, followed by a cooling trend. In general, the contribution of summer and winter temperature to MAT is significantly greater than that of spring and autumn temperatures. The relative contribution of each season varies over time and corresponds roughly with the seasonal insolation in each season. This independent evidence from mollusk records from the mid-latitudes of East Asia does not support the Holocene long-term warming trend observed in climate simulations and the seasonal bias explanation.
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Affiliation(s)
- Yajie Dong
- Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China. .,Innovation Academy for Earth Science, Chinese Academy of Sciences, Beijing, 100029, China. .,Center for Excellence in Life and Paleoenvironment, Chinese Academy of Sciences, Beijing, 100044, China.
| | - Naiqin Wu
- Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China.
| | - Fengjiang Li
- Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China.,Innovation Academy for Earth Science, Chinese Academy of Sciences, Beijing, 100029, China.,Center for Excellence in Life and Paleoenvironment, Chinese Academy of Sciences, Beijing, 100044, China
| | - Dan Zhang
- Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China.,College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Yueting Zhang
- Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China.,College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Caiming Shen
- Yunnan Key Laboratory of Plateau Geographical Processes and Environmental Changes, Faculty of Geography, Yunnan Normal University, Kunming, 650500, China
| | - Houyuan Lu
- Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China.,College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China
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35
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Hantemirov RM, Corona C, Guillet S, Shiyatov SG, Stoffel M, Osborn TJ, Melvin TM, Gorlanova LA, Kukarskih VV, Surkov AY, von Arx G, Fonti P. Current Siberian heating is unprecedented during the past seven millennia. Nat Commun 2022; 13:4968. [PMID: 36008406 PMCID: PMC9411110 DOI: 10.1038/s41467-022-32629-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2021] [Accepted: 08/05/2022] [Indexed: 11/09/2022] Open
Abstract
The Arctic is warming faster than any other region on Earth. Putting this rapid warming into perspective is challenging because instrumental records are often short or incomplete in polar regions and precisely-dated temperature proxies with high temporal resolution are largely lacking. Here, we provide this long-term perspective by reconstructing past summer temperature variability at Yamal Peninsula - a hotspot of recent warming - over the past 7638 years using annually resolved tree-ring records. We demonstrate that the recent anthropogenic warming interrupted a multi-millennial cooling trend. We find the industrial-era warming to be unprecedented in rate and to have elevated the summer temperature to levels above those reconstructed for the past seven millennia (in both 30-year mean and the frequency of extreme summers). This is undoubtedly of concern for the natural and human systems that are being impacted by climatic changes that lie outside the envelope of natural climatic variations for this region.
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Affiliation(s)
- Rashit M Hantemirov
- Institute of Plant and Animal Ecology, Ural Division of the Russian Academy of Sciences, Ekaterinburg, 620144, Russia. .,Ural Federal University, Ekaterinburg, 620002, Russia.
| | - Christophe Corona
- Climate Change Impacts and Risks in the Anthropocene (C-CIA), Institute for Environmental Sciences, University of Geneva, 1205, Geneva, Switzerland.,Geolab, UMR 6042 CNRS, Université Clermont Auvergne, F-63057, Clermont-Ferrand, France.,Department F.A. Forel for Environmental and Aquatic Sciences, University of Geneva, 1205, Geneva, Switzerland
| | - Sébastien Guillet
- Climate Change Impacts and Risks in the Anthropocene (C-CIA), Institute for Environmental Sciences, University of Geneva, 1205, Geneva, Switzerland
| | - Stepan G Shiyatov
- Institute of Plant and Animal Ecology, Ural Division of the Russian Academy of Sciences, Ekaterinburg, 620144, Russia
| | - Markus Stoffel
- Climate Change Impacts and Risks in the Anthropocene (C-CIA), Institute for Environmental Sciences, University of Geneva, 1205, Geneva, Switzerland.,Department F.A. Forel for Environmental and Aquatic Sciences, University of Geneva, 1205, Geneva, Switzerland.,Department of Earth Sciences, University of Geneva, 1205, Geneva, Switzerland
| | - Timothy J Osborn
- Climatic Research Unit, School of Environmental Sciences, University of East Anglia, Norwich, NR4 7TJ, UK
| | - Thomas M Melvin
- Climatic Research Unit, School of Environmental Sciences, University of East Anglia, Norwich, NR4 7TJ, UK
| | - Ludmila A Gorlanova
- Institute of Plant and Animal Ecology, Ural Division of the Russian Academy of Sciences, Ekaterinburg, 620144, Russia
| | - Vladimir V Kukarskih
- Institute of Plant and Animal Ecology, Ural Division of the Russian Academy of Sciences, Ekaterinburg, 620144, Russia.,Ural Federal University, Ekaterinburg, 620002, Russia
| | - Alexander Y Surkov
- Institute of Plant and Animal Ecology, Ural Division of the Russian Academy of Sciences, Ekaterinburg, 620144, Russia
| | - Georg von Arx
- Swiss Federal Research Institute WSL, 8903, Birmensdorf, Switzerland.,Oeschger Centre for Climate Change Research, University of Bern, 3012, Bern, Switzerland
| | - Patrick Fonti
- Swiss Federal Research Institute WSL, 8903, Birmensdorf, Switzerland
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36
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Zhang D, Huang X, Liu Q, Chen X, Feng Z. Holocene fire records and their drivers in the westerlies-dominated Central Asia. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 833:155153. [PMID: 35413343 DOI: 10.1016/j.scitotenv.2022.155153] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/01/2021] [Revised: 04/04/2022] [Accepted: 04/06/2022] [Indexed: 06/14/2023]
Abstract
Fire plays an important role in carbon emissions and climate changes in the Earth system and global/regional fires in the past have been detected. However, palaeofire history and their potential drivers are poorly understood in Central Asia. We in this study synthesized existing sedimentary charcoal records to reconstruct Holocene fire history in Central Asia and then assessed the relative importance of two potential controls (climatic and anthropogenic factors) on its trends. The results are: (1) Fire activity had insignificantly increased since ~7.9 cal. yr BP in Central Asia, although there was an obvious difference when fire history at different elevations is considered; (2) Periods of high fire activity occurred in the early-middle Holocene following by a decreasing trend in the late Holocene at high elevation, which might be attributed to a cooling temperature and the cooling-caused low biomass burning in the Holocene interval; (3) Episodes of high fire activity were common in the late Holocene and were primarily driven by the wetting-induced increased biomass burning, reinforced by the intensified human activities in middle-low elevation. Our findings could not only provide new unique insight about the long-time-scale fire-human-climate-vegetation interactions and also provide reasonable guidance for fire management given current climate change in Central Asia.
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Affiliation(s)
- Dongliang Zhang
- Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, 818 Beijing South Road, Urumqi 830011, China; Research Center for Ecology and Environment of Central Asia, Chinese Academy of Sciences, 818 Beijing South Road, Urumqi 830011, China; University of Chinese Academy of Sciences, 19A Yuquan Road, Beijing 100049, China.
| | - Xiaozhong Huang
- Key Laboratory of Western China's Environmental Systems (Ministry of Education), College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China
| | - Qi Liu
- College of Resource and Environment Sciences, Xinjiang University, Urumqi 830046, China
| | - Xi Chen
- Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, 818 Beijing South Road, Urumqi 830011, China; Research Center for Ecology and Environment of Central Asia, Chinese Academy of Sciences, 818 Beijing South Road, Urumqi 830011, China; University of Chinese Academy of Sciences, 19A Yuquan Road, Beijing 100049, China
| | - Zhaodong Feng
- College of Geography and Environment, Henan University, Jinming Street, Kaifeng 475004, China
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37
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Yang Y, Wang J, Li G, Dong J, Cao H, Ma M, Chen G, Dong G. Shift in subsistence crop dominance from broomcorn millet to foxtail millet around 5500 BP in the western Loess Plateau. FRONTIERS IN PLANT SCIENCE 2022; 13:939340. [PMID: 35958202 PMCID: PMC9362993 DOI: 10.3389/fpls.2022.939340] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/09/2022] [Accepted: 06/29/2022] [Indexed: 06/15/2023]
Abstract
Broomcorn and foxtail millet were the most important crops in northern China during the Neolithic period. Although the significance of broomcorn millet in human subsistence exceeded that of foxtail millet during the early Neolithic, this pattern was reversed by the end of Neolithic period. However, the process underlying this shift remains unclear. The recent excavation of the Gedachuan (GDC) in Zhangjiachuan county has revealed an abundance of relics including millet crop remains from relatively continuous strata of the Yangshao and Qijia cultures, and therefore provides a unique opportunity to examine how and when foxtail millet replaced broomcorn millet as the dominant crop in the western Loess Plateau during the Neolithic period. In this study, we identify 1,738 and 2,686 broomcorn and foxtail millet remains, respectively, from 74 flotation samples, accounting for 38.81% and 59.98% of total plant remains, respectively. Compared with 23 direct dates of carbonized crop grains in GDC, we propose that the weight of foxtail millet in plant subsistence of GDC first exceeded that of broomcorn millet as early as ∼5,500 BP, filling an important gap in the archaeobotanical record from the western Loess Plateau. Further comparative analysis of multidisciplinary data suggests the shift in significance of these two millet crops during the late Neolithic may have been triggered by variations in human settlement intensity and climate change in the western Loess Plateau. The results of this study also suggest that the Banpo Phase of Yangshao Culture survived in the western Loess Plateau as late as ∼5,600 BP.
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Affiliation(s)
- Yishi Yang
- Gansu Provincial Institute of Cultural Relics and Archaeology, Lanzhou, China
| | - Jia Wang
- MOE Key Laboratory of Western China’s Environmental System, College of Earth & Environmental Sciences, Lanzhou University, Lanzhou, China
| | - Gang Li
- MOE Key Laboratory of Western China’s Environmental System, College of Earth & Environmental Sciences, Lanzhou University, Lanzhou, China
| | - Jiajia Dong
- MOE Key Laboratory of Western China’s Environmental System, College of Earth & Environmental Sciences, Lanzhou University, Lanzhou, China
| | - Huihui Cao
- MOE Key Laboratory of Western China’s Environmental System, College of Earth & Environmental Sciences, Lanzhou University, Lanzhou, China
| | - Minmin Ma
- MOE Key Laboratory of Western China’s Environmental System, College of Earth & Environmental Sciences, Lanzhou University, Lanzhou, China
| | - Guoke Chen
- Gansu Provincial Institute of Cultural Relics and Archaeology, Lanzhou, China
| | - Guanghui Dong
- MOE Key Laboratory of Western China’s Environmental System, College of Earth & Environmental Sciences, Lanzhou University, Lanzhou, China
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38
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Racine TMF, Reimer PJ, Spötl C. Multi-centennial mass balance of perennial ice deposits in Alpine caves mirrors the evolution of glaciers during the Late Holocene. Sci Rep 2022; 12:11374. [PMID: 35790842 PMCID: PMC9256607 DOI: 10.1038/s41598-022-15516-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2022] [Accepted: 06/24/2022] [Indexed: 11/09/2022] Open
Abstract
Mid-latitude alpine caves preserve a record of past solid precipitation during winter, locally spanning several centuries to millennia. Dating organic macro-remains trapped in ice layers allows the determination of timing and duration of past periods of positive and negative ice mass balance. We present here the largest comparative study of ice cave sites yet published, using Bayesian age-modelling on a database comprising 107 radiocarbon dates, spread over eight caves in the Austrian Alps. We show that periods of positive mass balance coincide with past glacier advances. We find organic and macro-remain rich layers dated to the Medieval Climate Anomaly (between 850 and 1200 CE) marking widespread ice retreat. We demonstrate positive ice mass balance at all studied sites for the Little Ice Age, coinciding with the largest glacier advances in the Holocene between 1400 and 1850 CE. At the sites with records spanning over 2000 years, positive mass balance is also observed during the periods from 300 BCE to 100 CE and 600-800 CE. These subterranean ice deposits show widespread evidence of accelerated negative mass balances in recent years and their record is under imminent threat of disappearing.
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Affiliation(s)
- Tanguy M F Racine
- Institute of Geology, University of Innsbruck, Innrain 52f, 6020, Innsbruck, Austria.
| | | | - Christoph Spötl
- Institute of Geology, University of Innsbruck, Innrain 52f, 6020, Innsbruck, Austria
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39
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Reply to: Concerns of assuming linearity in the reconstruction of thermal maxima. Nature 2022; 607:E15-E18. [PMID: 35896651 DOI: 10.1038/s41586-022-04832-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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40
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Liu F, Zhang H, Li H, Zhang X, Liu Q, Zhang Y, Li H, Ma M. How Human Subsistence Strategy Affected Fruit-Tree Utilization During the Late Neolithic and Bronze Age: Investigations in the Northeastern Tibetan Plateau. FRONTIERS IN PLANT SCIENCE 2022; 13:941735. [PMID: 35845664 PMCID: PMC9284277 DOI: 10.3389/fpls.2022.941735] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/11/2022] [Accepted: 06/03/2022] [Indexed: 06/15/2023]
Abstract
The history of fruit-tree utilization by prehistoric people has become an important issue that has attracted increasing attention in recent years. However, the question of how people used fruit trees has not yet been answered; in particular, the impacts of different subsistence strategies on human behavior regarding fruit-tree utilization (wild gathering or conscious cultivation) have not yet been considered. Here, we present the results of charcoal identification of fruit trees from 16 dated archeological sites in the northeastern Tibetan Plateau (NETP) spanning the period c. 5,200-2,600 BP. We combine this with reported multidisciplinary evidence to explore the history of fruit-tree utilization as well as its relation to the subsistence strategy in the NETP during the late Neolithic and Bronze Age. Our results demonstrate that Rosaceae [Prunus L., Prunus Padus L., Maloideae L., and Malus baccata (L.) Borkh], Elaeagnaceae (Hippophae L. and Elaeagnus angustifolia L.), and Rhamnaceae (only Ziziphus Mill.) were used by people in the NETP, and there was a downward trend in the use of fruit trees during the late Neolithic and Bronze Age. This is in notable contrast to the situation in the Chinese Loess Plateau in the parallel period. The cold-dry climate during the Bronze Age seemed to be one of the reasons. The fruit trees used by people in the NETP were likely gathered from the wild rather than consciously cultivated, and the subsistence strategy of agropastoralism may have played a significant role during the processes.
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Affiliation(s)
- Fengwen Liu
- School of Ecology and Environment Science, Institute for Ecological Research and Pollution Control of Plateau Lakes, Yunnan University, Kunming, China
| | - Hucai Zhang
- School of Ecology and Environment Science, Institute for Ecological Research and Pollution Control of Plateau Lakes, Yunnan University, Kunming, China
| | - Hu Li
- School of History and Culture, Henan Normal University, Xinxiang, China
| | - Xiaonan Zhang
- School of Ecology and Environment Science, Institute for Ecological Research and Pollution Control of Plateau Lakes, Yunnan University, Kunming, China
| | - Qi Liu
- School of Ecology and Environment Science, Institute for Ecological Research and Pollution Control of Plateau Lakes, Yunnan University, Kunming, China
| | - Yang Zhang
- School of Ecology and Environment Science, Institute for Ecological Research and Pollution Control of Plateau Lakes, Yunnan University, Kunming, China
| | - Haoyu Li
- School of Ecology and Environment Science, Institute for Ecological Research and Pollution Control of Plateau Lakes, Yunnan University, Kunming, China
| | - Minmin Ma
- Ministry of Education Key Laboratory of Western China’s Environmental System, College of Earth and Environmental Sciences, Lanzhou University, Lanzhou, China
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Concerns of assuming linearity in the reconstruction of thermal maxima. Nature 2022; 607:E12-E14. [PMID: 35896654 DOI: 10.1038/s41586-022-04831-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2021] [Accepted: 05/03/2022] [Indexed: 11/08/2022]
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Li W, Tian F, Rudaya N, Herzschuh U, Cao X. Pollen-Based Holocene Thawing-History of Permafrost in Northern Asia and Its Potential Impacts on Climate Change. Front Ecol Evol 2022. [DOI: 10.3389/fevo.2022.894471] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
As the recent permafrost thawing of northern Asia proceeds due to anthropogenic climate change, precise and detailed palaeoecological records from past warm periods are essential to anticipate the extent of future permafrost variations. Here, based on the modern relationship between permafrost and vegetation (represented by pollen assemblages), we trained a Random Forest model using pollen and permafrost data and verified its reliability to reconstruct the history of permafrost in northern Asia during the Holocene. An early Holocene (12–8 cal ka BP) strong thawing trend, a middle-to-late Holocene (8–2 cal ka BP) relatively slow thawing trend, and a late Holocene freezing trend of permafrost in northern Asia are consistent with climatic proxies such as summer solar radiation and Northern Hemisphere temperature. The extensive distribution of permafrost in northern Asia inhibited the spread of evergreen coniferous trees during the early Holocene warming and might have decelerated the enhancement of the East Asian summer monsoon (EASM) by altering hydrological processes and albedo. Based on these findings, we suggest that studies of the EASM should consider more the state of permafrost and vegetation in northern Asia, which are often overlooked and may have a profound impact on climate change in this region.
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Jia X, Zhao D, Storozum MJ, Shi H, Bai G, Liu Z, Hu Z, Sun L, Wang Q, Li H. The "2.8 ka BP Cold Event" Indirectly Influenced the Agricultural Exploitation During the Late Zhou Dynasty in the Coastal Areas of the Jianghuai Region. FRONTIERS IN PLANT SCIENCE 2022; 13:902534. [PMID: 35677235 PMCID: PMC9168765 DOI: 10.3389/fpls.2022.902534] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/23/2022] [Accepted: 05/02/2022] [Indexed: 06/15/2023]
Abstract
As a global cooling event, many of the climatic and socio-cultural mechanisms that resulted in changes after the 2. 8 ka BP event remain unclear. In China, this period roughly corresponds with the Zhou Dynasty (1046-212 BC), a critical period when ancient Chinese civilization was experiencing significant cultural and technological changes, including the movement of people to modern-day Jiangsu Province, where they intensively used the natural resources found in this the coastal area. Recent archaeobotanical evidence, and two radiocarbon dates on wheat and foxtail millet, indicate that the Datongpu site, which dates around 2,600 cal a BP, was occupied during this period of transition around the 2.8 ka BP climate event. In total, our investigations recovered 3,399 carbonized seeds from seventy-four flotation samples, of which rice, foxtail millet, broomcorn millet, and wheat seeds where predominant along with 2,296 weed seeds. Additionally, we identified several rice spikelets and wheat rachises. The high number of carbonized rice grains indicates that rice farming was the primary crop in an otherwise mixed rice-dry farming system at Datongpu. In addition, we argue that the "2.8 ka BP cold event" probably influenced population growth and caused food shortages throughout Central China, leading people to migrate southeastward along the Huai River to the coastal areas of Jianghuai Region. We argue that this abrupt shift in the climate indirectly facilitated the exploitation and emergence of large-scale agriculture in this area. Our study provides an example for the indirect impact of climate change in areas with relatively favorable climate conditions.
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Affiliation(s)
- Xin Jia
- Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing, China
- Key Laboratory of Virtual Geographic Environment (Ministry of Education of PRC), Nanjing Normal University, Nanjing, China
- School of Geography, Nanjing Normal University, Nanjing, China
- Institute of Environmental Archaeology, Nanjing Normal University, Nanjing, China
| | | | - Michael J. Storozum
- School of History, Classics, and Archaeology, Newcastle University, Newcastle upon Tyne, United Kingdom
| | - Hongwei Shi
- School of Geography, Nanjing Normal University, Nanjing, China
- Institute of Environmental Archaeology, Nanjing Normal University, Nanjing, China
| | - Guozhu Bai
- School of History, Nanjing University, Nanjing, China
| | - Zhen Liu
- School of Geography, Nanjing Normal University, Nanjing, China
- Institute of Environmental Archaeology, Nanjing Normal University, Nanjing, China
| | - Zhujun Hu
- School of Geography, Nanjing Normal University, Nanjing, China
- Institute of Environmental Archaeology, Nanjing Normal University, Nanjing, China
| | - Liqiang Sun
- College of Humanities & Social Development, Nanjing Agricultural University, Nanjing, China
- Institution of Chinese Agricultural Civilization, Nanjing Agricultural University, Nanjing, China
- Agricultural Archaeology Research Center, Nanjing Agricultural University, Nanjing, China
| | - Qi Wang
- School of Geography, Nanjing Normal University, Nanjing, China
- Institute of Environmental Archaeology, Nanjing Normal University, Nanjing, China
| | - Haiming Li
- College of Humanities & Social Development, Nanjing Agricultural University, Nanjing, China
- Institution of Chinese Agricultural Civilization, Nanjing Agricultural University, Nanjing, China
- Agricultural Archaeology Research Center, Nanjing Agricultural University, Nanjing, China
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A Chironomid Record of Early-Middle Holocene Environmental Evolution in the Darhad Basin, Northern Mongolia. INSECTS 2022; 13:insects13050461. [PMID: 35621796 PMCID: PMC9144342 DOI: 10.3390/insects13050461] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/11/2022] [Revised: 05/11/2022] [Accepted: 05/12/2022] [Indexed: 11/16/2022]
Abstract
Under the influence of various circulation systems, the Holocene humidity conditions on the Mongolian Plateau are spatially heterogeneous and the underlying mechanism is still ambiguous. The complexity of climate change may affect the accuracy of assessing lake ecosystem evolution. In this study, based on the precise chronology, a chironomid assemblage sequence from the Darhad Basin in northern Mongolia is analyzed to elucidate the hydroclimate variation during the early-middle Holocene. The results show that the chironomid communities changed suddenly from littoral taxa to sublittoral/profundal taxa at about 9 cal kyr BP, reflecting an environmental transition from a river or shallow lake condition to a deep lake environment. Thereafter, most parts of the paleolake remained at a relatively high level until 4.5 cal kyr BP. This hydrological pattern resembles the typical humidity variations in the Westerlies affected regions, except that the onset of wetter conditions occurred one thousand years earlier as reflected in our results. The melting of glaciers and permafrost in the basin resulting from the early increased summer solar insolation could be a feasible explanation for these time advances.
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Gao J, Hou G, Xiao Y, E C, Wei H, Sun Y, Sun M, Xue H, Wende Z, Jin S, Chen X. Vegetation History and Survival Patterns of the Earliest Village on the Qinghai-Tibetan Plateau. FRONTIERS IN PLANT SCIENCE 2022; 13:903192. [PMID: 35646006 PMCID: PMC9134012 DOI: 10.3389/fpls.2022.903192] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/24/2022] [Accepted: 04/25/2022] [Indexed: 06/15/2023]
Abstract
The upper Yellow River valley in the northeastern Qinghai-Tibetan Plateau (QTP) is an important corridor for prehistoric migration to the hinterland plateau. However, most studies have focused on the Neolithic Age, with limited evidence for earlier periods. The Shalongka (SLK) site on the northeastern QTP spans the Epipaleolithic to Bronze Age and contains cultural deposits, so provides a good basis for unraveling the evolutionary history of the human-land relationship. In this study, we sampled the 420-cm-thick section T1406E at the SLK site and undertook lithologic stratigraphic description and analysis of grain size, redness, magnetic susceptibility, geochemical elements, pollen and charcoal. Dating control was provided by accelerated mass spectrometry 14C and optically stimulated luminescence methods. Results show that SLK site was affected by the local fluvial sedimentary environment. The absolute dating results of the SLK site have revealed that humans occupied the site during the Epipaleolithic (8.5-7.3 cal ka BP), Yangshao culture (5.9-5.1 ka) and Qijia Culture (4.1-3.9 cal ka BP). Pollen analysis showed that the humans lived in a landscape that was predominated by forest-steppe. Consolidating with multidisciplinary evidence, we learned that Epipaleolithic sites were occupied by microlithic hunter-gatherers and comprised by relatively fixed seasonal central campsites, and their mobility was significantly decreased from the early to late period. Subsequently, farmers of the Yangshao culture migrated from the low elevation (Chinese Loess Plateau) to the upper Yellow River valleys on the QTP and founded the earliest settlement villages (~5.9 ka) on the QTP. People of the Qijia culture adopted diversified survival strategies under the settled lifestyle. In all, we infered that SLK site may play an important role in the communication and integration between different people and cultures.
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Affiliation(s)
- Jingyi Gao
- Key Laboratory of Tibetan Plateau Land Surface Processes and Ecological Conservation (Ministry of Education), College of Geographical Science, Qinghai Normal University, Xining, China
- Qinghai Province Key Laboratory of Physical Geography and Environmental Process, College of Geographical Science, Qinghai Normal University, Xining, China
| | - Guangliang Hou
- Key Laboratory of Tibetan Plateau Land Surface Processes and Ecological Conservation (Ministry of Education), College of Geographical Science, Qinghai Normal University, Xining, China
- Qinghai Province Key Laboratory of Physical Geography and Environmental Process, College of Geographical Science, Qinghai Normal University, Xining, China
- Academy of Plateau Science and Sustainability, People's Government of Qinghai Province and Beijing Normal University, Xining, China
| | - Yongming Xiao
- Qinghai Provincial Institute of Cultural Relics and Archaeology, Xining, China
| | - Chongyi E
- Key Laboratory of Tibetan Plateau Land Surface Processes and Ecological Conservation (Ministry of Education), College of Geographical Science, Qinghai Normal University, Xining, China
- Qinghai Province Key Laboratory of Physical Geography and Environmental Process, College of Geographical Science, Qinghai Normal University, Xining, China
- Academy of Plateau Science and Sustainability, People's Government of Qinghai Province and Beijing Normal University, Xining, China
| | - Haicheng Wei
- Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining, China
| | - Yongjuan Sun
- Key Laboratory of Tibetan Plateau Land Surface Processes and Ecological Conservation (Ministry of Education), College of Geographical Science, Qinghai Normal University, Xining, China
- Qinghai Province Key Laboratory of Physical Geography and Environmental Process, College of Geographical Science, Qinghai Normal University, Xining, China
- Academy of Plateau Science and Sustainability, People's Government of Qinghai Province and Beijing Normal University, Xining, China
| | - Manping Sun
- Key Laboratory of Tibetan Plateau Land Surface Processes and Ecological Conservation (Ministry of Education), College of Geographical Science, Qinghai Normal University, Xining, China
- Qinghai Province Key Laboratory of Physical Geography and Environmental Process, College of Geographical Science, Qinghai Normal University, Xining, China
| | - Hongpan Xue
- School of Earth and Space Sciences, University of Science and Technology of China, Hefei, China
| | - Zhuoma Wende
- Key Laboratory of Tibetan Plateau Land Surface Processes and Ecological Conservation (Ministry of Education), College of Geographical Science, Qinghai Normal University, Xining, China
- Qinghai Province Key Laboratory of Physical Geography and Environmental Process, College of Geographical Science, Qinghai Normal University, Xining, China
| | - Sunmei Jin
- Key Laboratory of Tibetan Plateau Land Surface Processes and Ecological Conservation (Ministry of Education), College of Geographical Science, Qinghai Normal University, Xining, China
- Qinghai Province Key Laboratory of Physical Geography and Environmental Process, College of Geographical Science, Qinghai Normal University, Xining, China
| | - Xiaoliang Chen
- Key Laboratory of Tibetan Plateau Land Surface Processes and Ecological Conservation (Ministry of Education), College of Geographical Science, Qinghai Normal University, Xining, China
- Qinghai Province Key Laboratory of Physical Geography and Environmental Process, College of Geographical Science, Qinghai Normal University, Xining, China
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Thompson AJ, Zhu J, Poulsen CJ, Tierney JE, Skinner CB. Northern Hemisphere vegetation change drives a Holocene thermal maximum. SCIENCE ADVANCES 2022; 8:eabj6535. [PMID: 35427164 PMCID: PMC9012463 DOI: 10.1126/sciadv.abj6535] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/24/2021] [Accepted: 02/24/2022] [Indexed: 06/14/2023]
Abstract
The Holocene thermal maximum, a period of global warmth evident in early to mid-Holocene proxy reconstructions, is controversial. Most model simulations of the Holocene have not reproduced this warming, leading to a disagreement known as the Holocene Temperature Conundrum. Pollen records document the expansion of vegetation in the early and mid-Holocene African Sahara and Northern Hemisphere mid- and high latitudes, which has been overlooked in previous modeling studies. Here, we use time slice simulations of the Community Earth System Model to assess the impact of Northern Hemisphere vegetation change on Holocene annual mean temperatures. Our simulations indicate that expansion of Northern Hemisphere vegetation 9000 and 6000 years ago warms Earth's surface by ~0.8° and 0.7°C, respectively, producing a better match with proxy-based reconstructions. Our results suggest that vegetation change is critical for modeling Holocene temperature evolution and highlight its role in driving a mid-Holocene temperature maximum.
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Affiliation(s)
- Alexander J. Thompson
- Department of Earth and Environmental Sciences, University of Michigan, Ann Arbor, MI 48109, USA
| | - Jiang Zhu
- Climate and Global Dynamic Laboratory, National Center for Atmospheric Research, Boulder, CO 80305, USA
| | - Christopher J. Poulsen
- Department of Earth and Environmental Sciences, University of Michigan, Ann Arbor, MI 48109, USA
| | - Jessica E. Tierney
- Department of Geosciences, The University of Arizona, Tucson, AZ 85721, USA
| | - Christopher B. Skinner
- Department of Environmental, Earth and Atmospheric Sciences, University of Massachusetts Lowell, Lowell, MA 01854, USA
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Affiliation(s)
| | | | - Erland Bååth
- Section of Microbial Ecology Department of Biology Lund University 22362 Lund Sweden
| | - Patrick Meir
- School of Geosciences University of Edinburgh Crew Building, Kings Buildings Edinburgh UK
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48
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Field Model-Based Cultural Diffusion Patterns and GIS Spatial Analysis Study on the Spatial Diffusion Patterns of Qijia Culture in China. REMOTE SENSING 2022. [DOI: 10.3390/rs14061422] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Cultural diffusion is one of the core issues among researchers in the field of cultural geography. This study aimed to examine the spatial diffusion patterns of the Qijia culture (QJC) to clarify the origin and formation process of Chinese field model-based cultural diffusion patterns (FM-CDP) and geographic information system (GIS) spatial analysis methods. It used the point data of Qijia cultural sites without time information and combined them with the relevant records of Qijia cultural and historical documents, as well as archaeological excavation materials. Starting with the spatial location information of cultural distribution, it comprehensively analysed the cultural hearth, regions, diffusion patterns, and diffusion paths. The results indicated the following. (1) The QJC’s heart is in the southeast of Gansu Province, where the Shizhaocun and Xishanping sites are distributed. (2) Five different levels of cultural regions were formed, which demonstrated different diffusion patterns at different regional scales. On a large regional scale, many cultural regions belong to relocation diffusion patterns. Meanwhile, at the small regional scale (in the Gansu–Qinghai region), there are two patterns of diffusion: expansion diffusion and relocation diffusion; however, the expansion diffusion pattern is the main one. (3) Based on the relationship between the QJC, altitude, and the water system, the culture also has the characteristics of diffusion to low altitude areas and a pattern of diffusion along water systems. (4) There is a circular structure of the core, periphery, and fringe regions of the QJC. Finally, (5) the dry and cold climate around 4000a B.P., the cultural exchange between Europe and the Asian continent (the introduction of barley, wheat, livestock and sheep, and copper smelting technology), and the war in the late Neolithic period were important factors affecting the diffusion of the QJC.
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Jiang Q, Meng B, Wang Z, Qian P, Zheng J, Jiang J, Zhao C, Hou J, Dong G, Shen J, Liu W, Liu Z, Chen F. Exceptional terrestrial warmth around 4200-2800 years ago in Northwest China. Sci Bull (Beijing) 2022; 67:427-436. [PMID: 36546094 DOI: 10.1016/j.scib.2021.11.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2021] [Revised: 09/29/2021] [Accepted: 09/30/2021] [Indexed: 01/06/2023]
Abstract
One of the Holocene abrupt events around 4200 years ago, lasting for ∼ 200 years, is thought to have caused cultural disruptions, yet terrestrial climatic status right after the cold/dry event remains poorly defined and is often presumed that a generally cool condition prevailed during the Bronze Age (∼ 4000-2200 years ago). Here we report an alkenone-based summer temperature record over the past ∼ 12,000 years, in addition to two updated alkenone records, from Northwest China, providing new insights into the climatic status right after the event. Our results indicate that exceptional terrestrial warmth, up to ∼ 6 °C, occurred around 4200-2800 years ago during the Bronze Age, superimposed on the long-term Holocene cooling trend. The exceptional warmth in Northwest China, together with other climate anomalies elsewhere, suggests an unusual large-scale climatic reorganization at 4200-2800 years ago when solar activity remained high, with important implications to the climate background for cultural developments during the Bronze Age.
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Affiliation(s)
- Qingfeng Jiang
- Institute of Geographic Engineering Technology, School of Geography Sciences, Nantong University, Nantong 210093, China
| | - Bowen Meng
- Department of Earth Sciences, the University of Hong Kong, Hong Kong, China
| | - Zheng Wang
- State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Center for Excellence in Quaternary Science and Global Change, Chinese Academy of Sciences, Xi'an 710061, China
| | - Peng Qian
- Institute of Geographic Engineering Technology, School of Geography Sciences, Nantong University, Nantong 210093, China
| | - Jianan Zheng
- Institute of Geographic Engineering Technology, School of Geography Sciences, Nantong University, Nantong 210093, China
| | - Jiawei Jiang
- Department of Earth Sciences, the University of Hong Kong, Hong Kong, China
| | - Cheng Zhao
- School of Geography and Marine Science, Nanjing University, Nanjing 210046, China
| | - Juzhi Hou
- State Key Laboratory of Tibetan Plateau Earth System, Resources and Environment, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, China
| | - Guanghui Dong
- College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China
| | - Ji Shen
- School of Geography and Marine Science, Nanjing University, Nanjing 210046, China; State Key Laboratory of Lake Sciences and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China.
| | - Weiguo Liu
- State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Center for Excellence in Quaternary Science and Global Change, Chinese Academy of Sciences, Xi'an 710061, China; University of Chinese Academy of Sciences, Beijing 100049, China.
| | - Zhonghui Liu
- Department of Earth Sciences, the University of Hong Kong, Hong Kong, China.
| | - Fahu Chen
- State Key Laboratory of Tibetan Plateau Earth System, Resources and Environment, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, China
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Edvardsson J, Helama S, Rundgren M, Nielsen AB. The Integrated Use of Dendrochronological Data and Paleoecological Records From Northwest European Peatlands and Lakes for Understanding Long-Term Ecological and Climatic Changes—A Review. Front Ecol Evol 2022. [DOI: 10.3389/fevo.2022.781882] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Our overall understanding of long-term climate dynamics is largely based on proxy data generated from archives such as ice cores, ocean sediments, tree rings, speleothems, and corals, whereas reconstructions of long-term changes in vegetation and associated climate during the Holocene are largely based on paleoecological records from peat and lake sequences, primarily pollen and plant macrofossil data. However, since no proxy can provide a complete picture of the past, it is important to integrate different types of data, and to use methods that can support the paleoecological and paleoclimatic interpretations. Here we review how tree-ring data and dendrochronological approaches can be integrated with stratigraphic records to provide complementary paleoecological and paleoclimatic information. The review includes multiproxy studies in which dendrochronological data have been either compared or integrated with stratigraphic records, mainly pollen records, with the aim to contribute to a better understanding of long-term ecosystem and climate dynamics. We mainly focus on studies from northwest Europe in which tree-ring data and at least one type of paleoecological proxy record from the same site or area has been either compared or integrated. We find that integration of dendrochronological data and paleoecological records from peat and lake sequences is a powerful but underutilized approach to reconstruct long-term ecological and climatic changes. One likely reason for its limited use is the contrasting character of the two categories of data, including their different time resolution and occurrence, making them difficult to integrate. For example, subfossil wood providing annual dendrochronological data usually only occurs sporadically in peat and lake sediments, and the presence/absence of the trees are normally expected to be recorded in the pollen data with multi-decadal or coarser resolution. Therefore, we also discuss methods to compare and integrate dendrochronological and stratigraphic records, as well as the relevant paleoecological and paleoclimatic information provided by dendrochronology, pollen, and peat stratigraphy, with the aim to facilitate new multi-proxy initiatives that will contribute to a better understanding of long-term ecosystem and climate dynamics and thereby a firmer basis for future nature conservation initiatives.
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