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Fu H, Cai G, Özkan K, Johansson LS, Søndergaard M, Lauridsen TL, Yuan G, Jeppesen E. Re-oligotrophication and warming stabilize phytoplankton networks. WATER RESEARCH 2024; 253:121325. [PMID: 38367379 DOI: 10.1016/j.watres.2024.121325] [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: 10/24/2023] [Revised: 02/06/2024] [Accepted: 02/14/2024] [Indexed: 02/19/2024]
Abstract
Phytoplankton taxa are strongly interconnected as a network, which could show temporal dynamics and non-linear responses to changes in drivers at both seasonal and long-term scale. Using a high quality dataset of 20 Danish lakes (1989-2008), we applied extended Local Similarity Analysis to construct temporal network of phytoplankton communities for each lake, obtained sub-network for each sampling month, and then measured indices of network complexity and stability for each sub-network. We assessed how lake re-oligotrophication, climate warming and grazers influenced the temporal dynamics on network complexity and stability of phytoplankton community covering three aspects: seasonal trends, long-term trends and detrended variability. We found strong seasonality for the complexity and stability of phytoplankton network, an increasing trend for the average degree, modularity, nestedness, persistence and robustness, and a decreasing trend for connectance, negative:positive interactions and vulnerability. Our study revealed a cascading effect of lake re-oligotrophication, climate warming and zooplankton grazers on phytoplankton network stability through changes in network complexity characterizing diversity, interactions and topography. Network stability of phytoplankton increased with average degree, modularity, nestedness and decreased with connectance and negative:positive interactions. Oligotrophication and warming stabilized the phytoplankton network (enhanced robustness, persistence and decreased vulnerability) by enhancing its average degree, modularity, nestedness and by reducing its connectance, while zooplankton richness promoted stability of phytoplankton network through increases in average degree and decreases in negative interactions. Our results further indicate that the stabilization effects might lead to more closed, compartmentalized and nested interconnections especially in the deeper lakes, in the warmer seasons and during bloom periods. From a temporal dynamic network view, our findings highlight stabilization of the phytoplankton community as an adaptive response to lake re-oligotrophication, climate warming and grazers.
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Affiliation(s)
- Hui Fu
- Department of Ecology, College of Environment & Ecology, Hunan Provincial Key Laboratory of Rural Ecosystem Health in Dongting Lake Area, Hunan Agricultural University, Changsha 410128, PR China.
| | - Guojun Cai
- Department of Ecology, College of Environment & Ecology, Hunan Provincial Key Laboratory of Rural Ecosystem Health in Dongting Lake Area, Hunan Agricultural University, Changsha 410128, PR China
| | - Korhan Özkan
- Institute of Marine Sciences, Middle East Technical University, Erdemli, Mersin 33731, Turkey
| | - Liselotte Sander Johansson
- Department of Ecoscience and Centre for Water Technology /WATEC), Aarhus University, Vejlsøvej 25, Silkeborg 8600, Denmark
| | - Martin Søndergaard
- Department of Ecoscience and Centre for Water Technology /WATEC), Aarhus University, Vejlsøvej 25, Silkeborg 8600, Denmark; Sino-Danish Centre for Education and Research (SDC), University of Chinese Academy of Sciences, Beijing, China
| | - Torben L Lauridsen
- Department of Ecoscience and Centre for Water Technology /WATEC), Aarhus University, Vejlsøvej 25, Silkeborg 8600, Denmark; Sino-Danish Centre for Education and Research (SDC), University of Chinese Academy of Sciences, Beijing, China
| | - Guixiang Yuan
- Department of Ecology, College of Environment & Ecology, Hunan Provincial Key Laboratory of Rural Ecosystem Health in Dongting Lake Area, Hunan Agricultural University, Changsha 410128, PR China.
| | - Erik Jeppesen
- Institute of Marine Sciences, Middle East Technical University, Erdemli, Mersin 33731, Turkey; Department of Ecoscience and Centre for Water Technology /WATEC), Aarhus University, Vejlsøvej 25, Silkeborg 8600, Denmark; Sino-Danish Centre for Education and Research (SDC), University of Chinese Academy of Sciences, Beijing, China; Limnology Laboratory, Department of Biological Sciences and Centre for Ecosystem Research and Implementation, Middle East Technical University, Ankara, Turkey; Institute for Ecological Research and Pollution Control of Plateau Lakes, School of Ecology and Environmental Science, Yunnan University, Kunming 650500, China
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2
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Martins IS, Schrodt F, Blowes SA, Bates AE, Bjorkman AD, Brambilla V, Carvajal-Quintero J, Chow CFY, Daskalova GN, Edwards K, Eisenhauer N, Field R, Fontrodona-Eslava A, Henn JJ, van Klink R, Madin JS, Magurran AE, McWilliam M, Moyes F, Pugh B, Sagouis A, Trindade-Santos I, McGill BJ, Chase JM, Dornelas M. Widespread shifts in body size within populations and assemblages. Science 2023; 381:1067-1071. [PMID: 37676959 DOI: 10.1126/science.adg6006] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2023] [Accepted: 08/10/2023] [Indexed: 09/09/2023]
Abstract
Biotic responses to global change include directional shifts in organismal traits. Body size, an integrative trait that determines demographic rates and ecosystem functions, is thought to be shrinking in the Anthropocene. Here, we assessed the prevalence of body size change in six taxon groups across 5025 assemblage time series spanning 1960 to 2020. Using the Price equation to partition this change into within-species body size versus compositional changes, we detected prevailing decreases in body size through time driven primarily by fish, with more variable patterns in other taxa. We found that change in assemblage composition contributes more to body size changes than within-species trends, but both components show substantial variation in magnitude and direction. The biomass of assemblages remains quite stable as decreases in body size trade off with increases in abundance.
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Affiliation(s)
- Inês S Martins
- Centre for Biological Diversity, School of Biology, University of St Andrews, St Andrews KY16 9TH, Scotland
- Leverhulme Centre for Anthropocene Biodiversity, University of York, York YO10 5DD, UK
| | - Franziska Schrodt
- School of Geography, University of Nottingham, University Park, Nottingham NG7 2RD
| | - Shane A Blowes
- German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Leipzig 04103, Germany
- Department of Computer Science, Martin Luther University Halle-Wittenberg, Halle (Saale) 06099, Germany
| | - Amanda E Bates
- Department of Biology, University of Victoria, Victoria, British Columbia, Canada
| | - Anne D Bjorkman
- Department of Biological and Environmental Sciences, University of Gothenburg, Gothenburg 40530, Sweden
- Gothenburg Global Biodiversity Centre, Gothenburg 41319, Sweden
| | - Viviana Brambilla
- Centre for Biological Diversity, School of Biology, University of St Andrews, St Andrews KY16 9TH, Scotland
- MARE, Guia Marine Laboratory, Faculty of Sciences, University of Lisbon, Cascais 2750-374, Portugal
| | - Juan Carvajal-Quintero
- German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Leipzig 04103, Germany
- Institute of Biology, Leipzig University, Leipzig 04103, Germany
| | - Cher F Y Chow
- Centre for Biological Diversity, School of Biology, University of St Andrews, St Andrews KY16 9TH, Scotland
| | - Gergana N Daskalova
- International Institute for Applied Systems Analysis (IIASA), Laxenburg 2361, Austria
| | - Kyle Edwards
- Department of Oceanography, University of Hawai''i at Mānoa, Honolulu, HI 96822, USA
| | - Nico Eisenhauer
- German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Leipzig 04103, Germany
- Institute of Biology, Leipzig University, Leipzig 04103, Germany
| | - Richard Field
- School of Geography, University of Nottingham, University Park, Nottingham NG7 2RD
| | - Ada Fontrodona-Eslava
- Centre for Biological Diversity, School of Biology, University of St Andrews, St Andrews KY16 9TH, Scotland
| | - Jonathan J Henn
- Department of Evolution, Ecology, and Organismal Biology, University of California Riverside, Riverside, CA 92521, USA
- Institute of Arctic and Alpine Research, University of Colorado Boulder, Boulder, CO 80303, USA
| | - Roel van Klink
- German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Leipzig 04103, Germany
- Department of Computer Science, Martin Luther University Halle-Wittenberg, Halle (Saale) 06099, Germany
| | - Joshua S Madin
- Hawai''i Institute of Marine Biology, University of Hawai''i at Manoa, Kāne'ohe, Hawai''i 96744, USA
| | - Anne E Magurran
- Centre for Biological Diversity, School of Biology, University of St Andrews, St Andrews KY16 9TH, Scotland
| | - Michael McWilliam
- Centre for Biological Diversity, School of Biology, University of St Andrews, St Andrews KY16 9TH, Scotland
| | - Faye Moyes
- Centre for Biological Diversity, School of Biology, University of St Andrews, St Andrews KY16 9TH, Scotland
| | - Brittany Pugh
- School of Geography, University of Nottingham, University Park, Nottingham NG7 2RD
- University College London, School of Geography, Gower Street, London WC1E 6AE, UK
| | - Alban Sagouis
- German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Leipzig 04103, Germany
- Department of Computer Science, Martin Luther University Halle-Wittenberg, Halle (Saale) 06099, Germany
| | - Isaac Trindade-Santos
- Centre for Biological Diversity, School of Biology, University of St Andrews, St Andrews KY16 9TH, Scotland
- Macroevolution Unit, Okinawa Institute of Science and Technology Graduate University, 1919-1, Tancha, Onna-son, Kunigami-gun 904-0495, Okinawa, Japan
| | - Brian J McGill
- School of Biology and Ecology and Mitchell Center for Sustainability Solutions, University of Maine, Orono, ME 04469, USA
| | - Jonathan M Chase
- German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Leipzig 04103, Germany
- Department of Computer Science, Martin Luther University Halle-Wittenberg, Halle (Saale) 06099, Germany
| | - Maria Dornelas
- Centre for Biological Diversity, School of Biology, University of St Andrews, St Andrews KY16 9TH, Scotland
- Leverhulme Centre for Anthropocene Biodiversity, University of York, York YO10 5DD, UK
- MARE, Guia Marine Laboratory, Faculty of Sciences, University of Lisbon, Cascais 2750-374, Portugal
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3
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Merz E, Saberski E, Gilarranz LJ, Isles PDF, Sugihara G, Berger C, Pomati F. Disruption of ecological networks in lakes by climate change and nutrient fluctuations. NATURE CLIMATE CHANGE 2023; 13:389-396. [PMID: 37038592 PMCID: PMC10079529 DOI: 10.1038/s41558-023-01615-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/28/2022] [Accepted: 01/24/2023] [Indexed: 06/19/2023]
Abstract
Climate change interacts with local processes to threaten biodiversity by disrupting the complex network of ecological interactions. While changes in network interactions drastically affect ecosystems, how ecological networks respond to climate change, in particular warming and nutrient supply fluctuations, is largely unknown. Here, using an equation-free modelling approach on monthly plankton community data in ten Swiss lakes, we show that the number and strength of plankton community interactions fluctuate and respond nonlinearly to water temperature and phosphorus. While lakes show system-specific responses, warming generally reduces network interactions, particularly under high phosphate levels. This network reorganization shifts trophic control of food webs, leading to consumers being controlled by resources. Small grazers and cyanobacteria emerge as sensitive indicators of changes in plankton networks. By exposing the outcomes of a complex interplay between environmental drivers, our results provide tools for studying and advancing our understanding of how climate change impacts entire ecological communities.
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Affiliation(s)
- Ewa Merz
- Department of Aquatic Ecology, Eawag: Swiss Federal Institute of Aquatic Science and Technology, Dübendorf, Switzerland
| | - Erik Saberski
- Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA USA
| | - Luis J. Gilarranz
- Department of Aquatic Ecology, Eawag: Swiss Federal Institute of Aquatic Science and Technology, Dübendorf, Switzerland
| | - Peter D. F. Isles
- Vermont Department of Environmental Conservation, Montpelier, VT USA
| | - George Sugihara
- Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA USA
| | - Christine Berger
- Stadt Zuerich, Wasserversorgung, Qualitaetsueberwachung, Zuerich, Switzerland
| | - Francesco Pomati
- Department of Aquatic Ecology, Eawag: Swiss Federal Institute of Aquatic Science and Technology, Dübendorf, Switzerland
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4
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Ibáñez C, Caiola N, Barquín J, Belmar O, Benito‐Granell X, Casals F, Fennessy S, Hughes J, Palmer M, Peñuelas J, Romero E, Sardans J, Williams M. Ecosystem-level effects of re-oligotrophication and N:P imbalances in rivers and estuaries on a global scale. GLOBAL CHANGE BIOLOGY 2023; 29:1248-1266. [PMID: 36366939 PMCID: PMC10107953 DOI: 10.1111/gcb.16520] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/26/2022] [Revised: 10/28/2022] [Accepted: 10/29/2022] [Indexed: 05/26/2023]
Abstract
Trends and ecological consequences of phosphorus (P) decline and increasing nitrogen (N) to phosphorus (N:P) ratios in rivers and estuaries are reviewed and discussed. Results suggest that re-oligotrophication is a dominant trend in rivers and estuaries of high-income countries in the last two-three decades, while in low-income countries widespread eutrophication occurs. The decline in P is well documented in hundreds of rivers of United States and the European Union, but the biotic response of rivers and estuaries besides phytoplankton decline such as trends in phytoplankton composition, changes in primary production, ecosystem shifts, cascading effects, changes in ecosystem metabolism, etc., have not been sufficiently monitored and investigated, neither the effects of N:P imbalance. N:P imbalance has significant ecological effects that need to be further investigated. There is a growing number of cases in which phytoplankton biomass have been shown to decrease due to re-oligotrophication, but the potential regime shift from phytoplankton to macrophyte dominance described in shallow lakes has been documented only in a few rivers and estuaries yet. The main reasons why regime shifts are rarely described in rivers and estuaries are, from one hand the scarcity of data on macrophyte cover trends, and from the other hand physical factors such as peak flows or high turbidity that could prevent a general spread of submerged macrophytes as observed in shallow lakes. Moreover, re-oligotrophication effects on rivers may be different compared to lakes (e.g., lower dominance of macrophytes) or estuaries (e.g., limitation of primary production by N instead of P) or may be dependent on river/estuary type. We conclude that river and estuary re-oligotrophication effects are complex, diverse and still little known, and in some cases are equivalent to those described in shallow lakes, but the regime shift is more likely to occur in mid to high-order rivers and shallow estuaries.
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Affiliation(s)
- Carles Ibáñez
- Department of Climate Change, Area of SustainabilityEURECAT, Technological Centre of CataloniaAmpostaSpain
- National Socio‐Environmental Synthesis Center (SESYNC)University of MarylandAnnapolisMarylandUSA
| | - Nuno Caiola
- Department of Climate Change, Area of SustainabilityEURECAT, Technological Centre of CataloniaAmpostaSpain
| | - José Barquín
- IHCantabria, Instituto de Hidráulica AmbientalUniversidad de CantabriaSantanderSpain
| | - Oscar Belmar
- IRTA, Program of Marine & Continental WatersLa RàpitaSpain
| | - Xavier Benito‐Granell
- National Socio‐Environmental Synthesis Center (SESYNC)University of MarylandAnnapolisMarylandUSA
- IRTA, Program of Marine & Continental WatersLa RàpitaSpain
| | - Frederic Casals
- Department of Animal ScienceUniversity of LleidaLleidaSpain
- Landscape Dynamics and Biodiversity ProgramCTFC—Forest Science and Technology Centre of CataloniaSolsonaSpain
| | - Siobhan Fennessy
- National Socio‐Environmental Synthesis Center (SESYNC)University of MarylandAnnapolisMarylandUSA
- Biology DepartmentKenyon CollegeGambierOhioUSA
| | - Jocelyne Hughes
- School of Geography and the EnvironmentUniversity of OxfordOxfordUK
| | - Margaret Palmer
- National Socio‐Environmental Synthesis Center (SESYNC)University of MarylandAnnapolisMarylandUSA
| | - Josep Peñuelas
- Global Ecology Unit, CREAF‐CSIC‐UABUniversitat Autònoma de BarcelonaBellaterraSpain
| | - Estela Romero
- Global Ecology Unit, CREAF‐CSIC‐UABUniversitat Autònoma de BarcelonaBellaterraSpain
| | - Jordi Sardans
- Global Ecology Unit, CREAF‐CSIC‐UABUniversitat Autònoma de BarcelonaBellaterraSpain
| | - Michael Williams
- Chesapeake Biological LaboratoryUniversity of Maryland Center for Environmental ScienceSolomonsMarylandUSA
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5
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O'Brien DA, Gal G, Thackeray SJ, Matsuzaki SS, Clements CF. Planktonic functional diversity changes in synchrony with lake ecosystem state. GLOBAL CHANGE BIOLOGY 2023; 29:686-701. [PMID: 36370051 PMCID: PMC10100413 DOI: 10.1111/gcb.16485] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/25/2022] [Revised: 08/23/2022] [Accepted: 10/07/2022] [Indexed: 06/16/2023]
Abstract
Managing ecosystems to effectively preserve function and services requires reliable tools that can infer changes in the stability and dynamics of a system. Conceptually, functional diversity (FD) appears as a sensitive and viable monitoring metric stemming from suggestions that FD is a universally important measure of biodiversity and has a mechanistic influence on ecological processes. It is however unclear whether changes in FD consistently occur prior to state responses or vice versa, with no current work on the temporal relationship between FD and state to support a transition towards trait-based indicators. There is consequently a knowledge gap regarding when functioning changes relative to biodiversity change and where FD change falls in that sequence. We therefore examine the lagged relationship between planktonic FD and abundance-based metrics of system state (e.g. biomass) across five highly monitored lake communities using both correlation and cutting edge non-linear empirical dynamic modelling approaches. Overall, phytoplankton and zooplankton FD display synchrony with lake state but each lake is idiosyncratic in the strength of relationship. It is therefore unlikely that changes in plankton FD are identifiable before changes in more easily collected abundance metrics. These results highlight the power of empirical dynamic modelling in disentangling time lagged relationships in complex multivariate ecosystems, but suggest that FD cannot be generically viable as an early indicator. Individual lakes therefore require consideration of their specific context and any interpretation of FD across systems requires caution. However, FD still retains value as an alternative state measure or a trait representation of biodiversity when considered at the system level.
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Affiliation(s)
| | - Gideon Gal
- Kinneret Limnological LaboratoryIsrael Oceanographic and Limnological ResearchMigdalIsrael
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6
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A hybrid empirical and parametric approach for managing ecosystem complexity: Water quality in Lake Geneva under nonstationary futures. Proc Natl Acad Sci U S A 2022; 119:e2102466119. [PMID: 35733249 PMCID: PMC9245694 DOI: 10.1073/pnas.2102466119] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
This paper develops a hybrid approach to account for the complex interactions affecting lake water quality and its management in a nonlinear, changing world. The approach uses data to leverage our first-principles understanding of the mechanisms operating on dissolved oxygen in the lake. This yields a manageable, but more complete systems perspective for environmental management of the lake under climate change, where our analysis suggests that multiple modes of intervention may be necessary to achieve a healthy lake. Severe deterioration of water quality in lakes, characterized by overabundance of algae and declining dissolved oxygen in the deep lake (DOB), was one of the ecological crises of the 20th century. Even with large reductions in phosphorus loading, termed “reoligotrophication,” DOB and chlorophyll (CHL) have often not returned to their expected pre–20th-century levels. Concurrently, management of lake health has been confounded by possible consequences of climate change, particularly since the effects of climate are not neatly separable from the effects of eutrophication. Here, using Lake Geneva as an iconic example, we demonstrate a complementary alternative to parametric models for understanding and managing lake systems. This involves establishing an empirically-driven baseline that uses supervised machine learning to capture the changing interdependencies among biogeochemical variables and then combining the empirical model with a more conventional equation-based model of lake physics to predict DOB over decadal time-scales. The hybrid model not only leads to substantially better forecasts, but also to a more actionable description of the emergent rates and processes (biogeochemical, ecological, etc.) that drive water quality. Notably, the hybrid model suggests that the impact of a moderate 3°C air temperature increase on water quality would be on the same order as the eutrophication of the previous century. The study provides a template and a practical path forward to cope with shifts in ecology to manage environmental systems for non-analogue futures.
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7
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Tison-Rosebery J, Leboucher T, Archaimbault V, Belliard J, Carayon D, Ferréol M, Floury M, Jeliazkov A, Tales E, Villeneuve B, Passy SI. Decadal biodiversity trends in rivers reveal recent community rearrangements. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 823:153431. [PMID: 35143793 DOI: 10.1016/j.scitotenv.2022.153431] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2021] [Revised: 01/21/2022] [Accepted: 01/22/2022] [Indexed: 06/14/2023]
Abstract
While it is recognized that biodiversity currently declines at a global scale, we still have an incomplete understanding of local biodiversity trends under global change. To address this deficiency, we examined the recent decadal trends in water quality and biodiversity (taxonomic and functional) of key river organisms (diatoms, macroinvertebrates and fish) in France. We implemented regression, RLQ and fourth-corner analyses. Our results showed that nutrient loads tended to decrease, diatom richness tended to decline and macoinvertebrate richness tended to increase. The recovery of sensitive taxa in all three groups suggested a successful outcome of water quality management in France over the past decades. Our study further revealed consistent rearrangements within river communities, with a decrease in the ratio of planktonic to benthic diatoms, and corresponding functional changes in macroinvertebrate and fish trait composition, indicative of a trophic cascade in response to changes in environmental conditions.
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Affiliation(s)
| | | | - V Archaimbault
- University of Paris Saclay, INRAE, UR HYCAR, F-92160 Antony, France
| | - J Belliard
- University of Paris Saclay, INRAE, UR HYCAR, F-92160 Antony, France
| | - D Carayon
- INRAE, UR ETBX, F-33612 Cestas, France
| | - M Ferréol
- INRAE, UR RIVERLY, F-69625 Villeurbanne, France
| | - M Floury
- Univ Lyon, Université Claude Bernard Lyon 1, CNRS, ENTPE, UMR 5023 LEHNA, F-69622, Villeurbanne, France
| | - A Jeliazkov
- University of Paris Saclay, INRAE, UR HYCAR, F-92160 Antony, France
| | - E Tales
- University of Paris Saclay, INRAE, UR HYCAR, F-92160 Antony, France
| | | | - S I Passy
- University of Texas at Arlington, Department of Biology, TX 76019, Arlington, USA
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8
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Bellier E, Engen S, Jensen TC. Seasonal diversity dynamics of a boreal zooplankton community under climate impact. Oecologia 2022; 199:139-152. [PMID: 35471618 PMCID: PMC9120095 DOI: 10.1007/s00442-022-05165-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2022] [Accepted: 04/02/2022] [Indexed: 12/03/2022]
Abstract
Seasonality and long-term environmental variability affect species diversity through their effects on the dynamics of species. To investigate such effects, we fitted a dynamic and heterogeneous species abundance model generating the lognormal species abundance distribution to an assemblage of freshwater zooplankton sampled five times a year (June-October) during the ice-free period over 28 years (1990-2017) in Lake Atnsjøen (Norway). By applying a multivariate stochastic community dynamics model for describing the fluctuations in abundances, we show that the community dynamics was driven by environmental variability in spring (i.e., June). In contrast, community-level ecological heterogeneity is highest in autumn. The autumn months (i.e., September and October) that rearranged the community are most likely crucial months to monitor long-term changes in community structure. Indeed, noises from early summer are filtered away, making it easier to track long-term changes. The community returned faster towards equilibrium when ecological heterogeneity was the highest (i.e., in September and October). This occurred because of stronger density-regulation in months with highest ecological heterogeneity. The community responded to the long-term warming of water temperature with decreasing species diversity and increasing abundance. Unevenness associated with variabilities in abundances might affect species interactions within the community. These can have consequences for the stability and functioning of the ecosystem.
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Affiliation(s)
- Edwige Bellier
- Department of Arctic and Marine Biology, UiT The Arctic University of Norway, 9037, Tromsø, Norway.
- Department of Natural Resources Science, University of Rhode Island, Kingston, RI, 02881, USA.
| | - Steinar Engen
- Centre for Biodiversity Dynamics, Department of Mathematical Science, Norwegian University for Science and Technology, 7491, Trondheim, Norway
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9
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Kyathanahally SP, Hardeman T, Merz E, Bulas T, Reyes M, Isles P, Pomati F, Baity-Jesi M. Deep Learning Classification of Lake Zooplankton. Front Microbiol 2021; 12:746297. [PMID: 34867861 PMCID: PMC8634433 DOI: 10.3389/fmicb.2021.746297] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2021] [Accepted: 10/04/2021] [Indexed: 12/02/2022] Open
Abstract
Plankton are effective indicators of environmental change and ecosystem health in freshwater habitats, but collection of plankton data using manual microscopic methods is extremely labor-intensive and expensive. Automated plankton imaging offers a promising way forward to monitor plankton communities with high frequency and accuracy in real-time. Yet, manual annotation of millions of images proposes a serious challenge to taxonomists. Deep learning classifiers have been successfully applied in various fields and provided encouraging results when used to categorize marine plankton images. Here, we present a set of deep learning models developed for the identification of lake plankton, and study several strategies to obtain optimal performances, which lead to operational prescriptions for users. To this aim, we annotated into 35 classes over 17900 images of zooplankton and large phytoplankton colonies, detected in Lake Greifensee (Switzerland) with the Dual Scripps Plankton Camera. Our best models were based on transfer learning and ensembling, which classified plankton images with 98% accuracy and 93% F1 score. When tested on freely available plankton datasets produced by other automated imaging tools (ZooScan, Imaging FlowCytobot, and ISIIS), our models performed better than previously used models. Our annotated data, code and classification models are freely available online.
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10
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Josué IIP, Sodré EO, Setubal RB, Cardoso SJ, Roland F, Figueiredo‐Barros MP, Bozelli RL. Zooplankton functional diversity as an indicator of a long‐term aquatic restoration in an Amazonian lake. Restor Ecol 2021. [DOI: 10.1111/rec.13365] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- Iollanda I. P. Josué
- Departamento de Ecologia Universidade Federal do Rio de Janeiro, Instituto de Biologia Rio de Janeiro Brazil
- Departamento de Zoologia Universidade Federal de Juiz de Fora, Instituto de Ciências Biológicas Juiz de Fora Brazil
| | - Elder O. Sodré
- Departamento de Ecologia Universidade Federal do Rio de Janeiro, Instituto de Biologia Rio de Janeiro Brazil
| | - Rayanne B. Setubal
- Departamento de Ecologia Universidade Federal do Rio de Janeiro, Instituto de Biologia Rio de Janeiro Brazil
| | - Simone J. Cardoso
- Departamento de Zoologia Universidade Federal de Juiz de Fora, Instituto de Ciências Biológicas Juiz de Fora Brazil
| | - Fabio Roland
- Departamento de Biologia Universidade Federal de Juiz de Fora, Instituto de Ciências Biológicas Juiz de Fora Brazil
| | - Marcos P. Figueiredo‐Barros
- Universidade Federal do Rio de Janeiro, Instituto de Biodiversidade e Sustentabilidade (NUPEM/UFRJ) Rio de Janeiro Brazil
| | - Reinaldo L. Bozelli
- Departamento de Ecologia Universidade Federal do Rio de Janeiro, Instituto de Biologia Rio de Janeiro Brazil
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11
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Liu F, Giometto A, Wu M. Microfluidic and mathematical modeling of aquatic microbial communities. Anal Bioanal Chem 2021; 413:2331-2344. [PMID: 33244684 PMCID: PMC7990691 DOI: 10.1007/s00216-020-03085-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2020] [Revised: 11/05/2020] [Accepted: 11/19/2020] [Indexed: 01/27/2023]
Abstract
Aquatic microbial communities contribute fundamentally to biogeochemical transformations in natural ecosystems, and disruption of these communities can lead to ecological disasters such as harmful algal blooms. Microbial communities are highly dynamic, and their composition and function are tightly controlled by the biophysical (e.g., light, fluid flow, and temperature) and biochemical (e.g., chemical gradients and cell concentration) parameters of the surrounding environment. Due to the large number of environmental factors involved, a systematic understanding of the microbial community-environment interactions is lacking. In this article, we show that microfluidic platforms present a unique opportunity to recreate well-defined environmental factors in a laboratory setting in a high throughput way, enabling quantitative studies of microbial communities that are amenable to theoretical modeling. The focus of this article is on aquatic microbial communities, but the microfluidic and mathematical models discussed here can be readily applied to investigate other microbiomes.
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Affiliation(s)
- Fangchen Liu
- Department of Biological and Environmental Engineering, Cornell University, Ithaca, NY, 14853, USA
| | - Andrea Giometto
- School of Civil and Environmental Engineering, Cornell University, Ithaca, NY, 14853, USA
| | - Mingming Wu
- Department of Biological and Environmental Engineering, Cornell University, Ithaca, NY, 14853, USA.
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12
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Wilk-Woźniak E, Krztoń W, Górnik M. Synergistic impact of socio-economic and climatic changes on the ecosystem of a deep dam reservoir: Case study of the Dobczyce dam reservoir based on a 30-year monitoring study. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 756:144055. [PMID: 33261880 DOI: 10.1016/j.scitotenv.2020.144055] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/14/2020] [Revised: 11/07/2020] [Accepted: 11/19/2020] [Indexed: 06/12/2023]
Abstract
Climate change, increasing inequality in freshwater supply and consumption, as well as human land use activities are remarkable drivers of the alteration of the water cycle on the Earth. The aim of our research was to determine if socio-economic and climatic changes affected the ecosystem of a deep dam reservoir which is used for drinking water. A 30-years data series showed that suburbanization did not negatively affect the quality of the water. Moreover, 30 years of socio-economic and political changes resulted in land use changes (increase of forest from 45 to 50% and decrease of agricultural land from 53 to 43%) and better management of the catchment, as well as the modernization and introduction of new technologies. Furthermore, simultaneous climatic changes affected various physical and chemical features of the studied reservoir, and the most important finding is that the thermal stratification period is extended as an effect of global warming (begins earlier and lasts longer). The complexity of the processes contributing to the functioning of the ecosystem is large, so some processes might be a result of synergistic effects of global warming and socio-economic changes. Our 30-year monitoring study explicitly shows how the ecosystem of a deep dam reservoir reflected these changes.
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Affiliation(s)
- Elżbieta Wilk-Woźniak
- Institute of Nature Conservation, Polish Academy of Sciences, al. Adama Mickiewicza 33, 31-120 Kraków, Poland
| | - Wojciech Krztoń
- Institute of Nature Conservation, Polish Academy of Sciences, al. Adama Mickiewicza 33, 31-120 Kraków, Poland.
| | - Marek Górnik
- Institute of Geography and Spatial Management, Jagiellonian University, Gronostajowa Str. 7, 30-387 Cracow, Poland
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13
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Fu H, Yuan G, Özkan K, Johansson LS, Søndergaard M, Lauridsen TL, Jeppesen E. Seasonal and long-term trends in the spatial heterogeneity of lake phytoplankton communities over two decades of restoration and climate change. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 748:141106. [PMID: 32814284 DOI: 10.1016/j.scitotenv.2020.141106] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2020] [Revised: 06/24/2020] [Accepted: 07/18/2020] [Indexed: 06/11/2023]
Abstract
World-wide, reducing the external nutrient loading to lakes has been the primary priority of lake management in the restoration of eutrophic lakes over the past decades, and as expected this has resulted in an increase in the local environmental heterogeneity, and thus biotic heterogeneity, within lakes. However, little is known about how the regional spatial heterogeneity of lake biotic communities changes with restoration across a landscape. Using a long-term monitoring dataset from 20 Danish lakes, we elucidated the seasonal and long-term trends in the spatial heterogeneity of climate, local abiotic variables and phytoplankton communities over two decades of restoration and climate change at landscape level. We found significant seasonality in the spatial heterogeneity of most climatic and local drivers as well as in the total beta diversity (Sørensen coefficient) and its turnover components (Simpson coefficient) of phytoplankton communities among the lakes. The seasonality tended to be less marked in deep than in shallow lakes. We found significant spatial homogenisation of most local drivers (except for alkalinity) and phytoplankton communities after two decades of restoration and that turnover dominated the temporal responses of the total beta diversity of phytoplankton communities. Path analyses showed that the homogenisation of phytoplankton communities was mainly due to a decrease in spatial heterogeneity of total phosphorus and Schmidt stability in shallow lakes and to a decrease in spatial total phosphorus and total nitrogen heterogeneity in deep lakes. However, albeit weakly, the spatial heterogeneity of the phytoplankton communities was affected indirectly by climatic warming in both shallow and deep lakes and directly by wind speed in shallow lakes. We conclude that restoration of eutrophic lakes may lead to an increase in the local heterogeneity of phytoplankton communities at lake scale and an increase in homogeneity at landscape scale.
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Affiliation(s)
- Hui Fu
- Ecology Department, College of Resources & Environments, Hunan Provincial Key Laboratory of Rural Ecosystem Health in Dongting Lake Area, Hunan Agricultural University, Changsha 410128, PR China.
| | - Guixiang Yuan
- Ecology Department, College of Resources & Environments, Hunan Provincial Key Laboratory of Rural Ecosystem Health in Dongting Lake Area, Hunan Agricultural University, Changsha 410128, PR China
| | - Korhan Özkan
- Institute of Marine Sciences, Middle East Technical University, Mersin, Turkey
| | | | - Martin Søndergaard
- Department of Bioscience, Aarhus University, Vejlsøvej 25, 8600 Silkeborg, Denmark; Sino-Danish Centre for Education and Research (SDC), University of Chinese Academy of Sciences, Beijing, China
| | - Torben L Lauridsen
- Department of Bioscience, Aarhus University, Vejlsøvej 25, 8600 Silkeborg, Denmark; Sino-Danish Centre for Education and Research (SDC), University of Chinese Academy of Sciences, Beijing, China
| | - Erik Jeppesen
- Department of Bioscience, Aarhus University, Vejlsøvej 25, 8600 Silkeborg, Denmark; Sino-Danish Centre for Education and Research (SDC), University of Chinese Academy of Sciences, Beijing, China; Limnology Laboratory, Department of Biological Sciences, Centre for Ecosystem Research and Implementation, Middle East Technical University, Ankara, Turkey
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14
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Blowes SA, Supp SR, Antão LH, Bates A, Bruelheide H, Chase JM, Moyes F, Magurran A, McGill B, Myers-Smith IH, Winter M, Bjorkman AD, Bowler DE, Byrnes JEK, Gonzalez A, Hines J, Isbell F, Jones HP, Navarro LM, Thompson PL, Vellend M, Waldock C, Dornelas M. The geography of biodiversity change in marine and terrestrial assemblages. Science 2020; 366:339-345. [PMID: 31624208 DOI: 10.1126/science.aaw1620] [Citation(s) in RCA: 220] [Impact Index Per Article: 55.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2018] [Accepted: 09/10/2019] [Indexed: 12/19/2022]
Abstract
Human activities are fundamentally altering biodiversity. Projections of declines at the global scale are contrasted by highly variable trends at local scales, suggesting that biodiversity change may be spatially structured. Here, we examined spatial variation in species richness and composition change using more than 50,000 biodiversity time series from 239 studies and found clear geographic variation in biodiversity change. Rapid compositional change is prevalent, with marine biomes exceeding and terrestrial biomes trailing the overall trend. Assemblage richness is not changing on average, although locations exhibiting increasing and decreasing trends of up to about 20% per year were found in some marine studies. At local scales, widespread compositional reorganization is most often decoupled from richness change, and biodiversity change is strongest and most variable in the oceans.
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Affiliation(s)
- Shane A Blowes
- German Centre for Integrative Biodiversity Research (iDiv), Halle-Jena-Leipzig, Germany. .,Martin Luther University Halle-Wittenberg, Institute of Computer Science, Halle (Saale), Germany
| | - Sarah R Supp
- Data Analytics Program, Denison University, Granville, OH, USA.
| | - Laura H Antão
- Centre for Biological Diversity, School of Biology, University of St. Andrews, St. Andrews, UK.,Department of Biology and CESAM, Universidade de Aveiro, Aveiro, Portugal.,Research Centre for Ecological Change, Organismal and Evolutionary Biology Research Programme, University of Helsinki, Helsinki, Finland
| | - Amanda Bates
- Department of Ocean Sciences, Memorial University of Newfoundland, Newfoundland, Canada
| | - Helge Bruelheide
- German Centre for Integrative Biodiversity Research (iDiv), Halle-Jena-Leipzig, Germany.,Martin Luther University Halle-Wittenberg, Institute of Biology/Geobotany and Botanical Garden, Halle (Saale), Germany
| | - Jonathan M Chase
- German Centre for Integrative Biodiversity Research (iDiv), Halle-Jena-Leipzig, Germany.,Martin Luther University Halle-Wittenberg, Institute of Computer Science, Halle (Saale), Germany
| | - Faye Moyes
- Centre for Biological Diversity, School of Biology, University of St. Andrews, St. Andrews, UK
| | - Anne Magurran
- Centre for Biological Diversity, School of Biology, University of St. Andrews, St. Andrews, UK
| | - Brian McGill
- School of Biology and Ecology, University of Maine, Orono, ME, USA
| | | | - Marten Winter
- German Centre for Integrative Biodiversity Research (iDiv), Halle-Jena-Leipzig, Germany
| | - Anne D Bjorkman
- Senckenberg Gesellschaft für Naturforschung, Biodiversity and Climate Research Centre (BiK-F), Frankfurt am Main, Germany
| | - Diana E Bowler
- German Centre for Integrative Biodiversity Research (iDiv), Halle-Jena-Leipzig, Germany
| | - Jarrett E K Byrnes
- Department of Biology, University of Massachusetts Boston, Boston, MA, USA
| | - Andrew Gonzalez
- Department of Biology, Quebec Centre for Biodiversity Science, McGill University, Montreal, QC, Canada
| | - Jes Hines
- German Centre for Integrative Biodiversity Research (iDiv), Halle-Jena-Leipzig, Germany.,Leipzig University, Institute of Biology, Leipzig, Germany
| | - Forest Isbell
- Department of Ecology, Evolution, and Behavior, University of Minnesota, St. Paul, MN, USA
| | - Holly P Jones
- Department of Biological Sciences and Institute for the Study of the Environment, Sustainability, and Energy, Northern Illinois University, DeKalb, IL, USA
| | - Laetitia M Navarro
- German Centre for Integrative Biodiversity Research (iDiv), Halle-Jena-Leipzig, Germany.,Martin Luther University Halle-Wittenberg, Institute of Biology/Geobotany and Botanical Garden, Halle (Saale), Germany
| | - Patrick L Thompson
- Department of Zoology, University of British Columbia, Vancouver, BC, Canada
| | - Mark Vellend
- Département de biologie, Université de Sherbrooke, Sherbrooke, QC, Canada
| | - Conor Waldock
- Ocean and Earth Science, National Oceanography Centre, University of Southampton, Southampton, UK & Life Sciences, Natural History Museum, Cromwell Road, London, UK
| | - Maria Dornelas
- Centre for Biological Diversity, School of Biology, University of St. Andrews, St. Andrews, UK.
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15
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Znachor P, Nedoma J, Hejzlar J, Seďa J, Komárková J, Kolář V, Mrkvička T, Boukal DS. Changing environmental conditions underpin long-term patterns of phytoplankton in a freshwater reservoir. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 710:135626. [PMID: 31784170 DOI: 10.1016/j.scitotenv.2019.135626] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/09/2019] [Revised: 11/15/2019] [Accepted: 11/17/2019] [Indexed: 06/10/2023]
Abstract
Environmental changes can exert strong pressure on freshwater biota and lead to unwanted alterations of local communities and deterioration of ecosystem services. Disentangling the links between environmental and community changes is, therefore, essential to understand and predict the impact of human activities on freshwater ecosystems. This is particularly relevant for man-made freshwater reservoirs that represent a nexus between anthropogenic, environmental, and biotic effects. Reservoir food webs depend strongly on phytoplankton dynamics, which are affected by abiotic conditions, nutrient availability and grazing pressure by zooplankton. We studied the effects of relevant environmental drivers (hydrochemistry, hydrodynamics and zooplankton) on the composition, diversity and community stability of main morpho-functional phytoplankton groups over 32 years in the Římov Reservoir (Czech Republic). Environmental conditions in the reservoir are characterised by three distinct periods (1983-89, 1990-99, and 2000-14) defined by shifts and breakpoints in temporal trends in reservoir hydrochemistry and hydraulic conditions, and we examined if and how phytoplankton responded to these abrupt changes. We found significant differences in phytoplankton composition among the three periods. Phytoplankton underwent a substantial compositional shift towards a dominance of pennate diatoms. Time-lag analysis of dissimilarity in phytoplankton composition revealed higher and stochastic annual variations until 1999, followed by a lower variability and divergence in phytoplankton composition in subsequent years. Changes in overall phytoplankton assemblage and most abundant morpho-functional phytoplankton groups were driven mainly by hydrochemical (total nitrogen) and hydrodynamic variables (inflow rate, surface level and mixing depth) and less by zooplankton dynamics. These results suggest that phytoplankton are driven primarily by nutrient input and water regime, both of which can be appropriately managed to support valuable ecosystem services provided by phytoplankton in freshwater reservoirs.
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Affiliation(s)
- Petr Znachor
- Biology Centre of Czech Academy of Sciences, v.v.i., Institute of Hydrobiology, Na Sádkách 7, České Budějovice 37005, Czech Republic; University of South Bohemia, Faculty of Science, Department of Ecosystem Biology & Soil and Water Research Infrastructure, Branišovská 31, České Budějovice 37005, Czech Republic.
| | - Jiří Nedoma
- Biology Centre of Czech Academy of Sciences, v.v.i., Institute of Hydrobiology, Na Sádkách 7, České Budějovice 37005, Czech Republic
| | - Josef Hejzlar
- Biology Centre of Czech Academy of Sciences, v.v.i., Institute of Hydrobiology, Na Sádkách 7, České Budějovice 37005, Czech Republic
| | - Jaromír Seďa
- Biology Centre of Czech Academy of Sciences, v.v.i., Institute of Hydrobiology, Na Sádkách 7, České Budějovice 37005, Czech Republic
| | - Jaroslava Komárková
- Biology Centre of Czech Academy of Sciences, v.v.i., Institute of Hydrobiology, Na Sádkách 7, České Budějovice 37005, Czech Republic
| | - Vojtěch Kolář
- University of South Bohemia, Faculty of Science, Department of Ecosystem Biology & Soil and Water Research Infrastructure, Branišovská 31, České Budějovice 37005, Czech Republic
| | - Tomáš Mrkvička
- Biology Centre of Czech Academy of Sciences, v.v.i., Institute of Hydrobiology, Na Sádkách 7, České Budějovice 37005, Czech Republic; Faculty of Economy, University of South Bohemia, Studentská 13, České Budějovice 37005, Czech Republic
| | - David S Boukal
- University of South Bohemia, Faculty of Science, Department of Ecosystem Biology & Soil and Water Research Infrastructure, Branišovská 31, České Budějovice 37005, Czech Republic
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16
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Pomati F, Shurin JB, Andersen KH, Tellenbach C, Barton AD. Interacting Temperature, Nutrients and Zooplankton Grazing Control Phytoplankton Size-Abundance Relationships in Eight Swiss Lakes. Front Microbiol 2020; 10:3155. [PMID: 32038586 PMCID: PMC6987318 DOI: 10.3389/fmicb.2019.03155] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2019] [Accepted: 12/30/2019] [Indexed: 11/14/2022] Open
Abstract
Biomass distribution among size classes follows a power law where the Log-abundance of taxa scales to Log-size with a slope that responds to environmental abiotic and biotic conditions. The interactions between ecological mechanisms controlling the slope of locally realized size-abundance relationships (SAR) are however not well understood. Here we tested how warming, nutrient levels, and grazing affect the slope of phytoplankton community SARs in decadal time-series from eight Swiss lakes of the peri-alpine region, which underwent environmental forcing due to climate change and oligotrophication. We expected rising temperature to have a negative effect on slope (favoring small phytoplankton), and increasing nutrient levels and grazing pressure to have a positive effect (benefiting large phytoplankton). Using a random forest approach to extract robust patterns from the noisy data, we found that the effects of temperature (direct and indirect through water column stability), nutrient availability (phosphorus and total biomass), and large herbivore (copepods and daphnids) grazing and selectivity on slope were non-linear and interactive. Increasing water temperature or total grazing pressure, and decreasing phosphorus levels, had a positive effect on slope (favoring large phytoplankton, which are predominantly mixotrophic in the lake dataset). Our results therefore showed patterns that were opposite to the expected long-term effects of temperature and nutrient levels, and support a paradigm in which (i) small phototrophic phytoplankton appear to be favored under high nutrients levels, low temperature and low grazing, and (ii) large mixotrophic algae are favored under oligotrophic conditions when temperature and grazing pressure are high. The effects of temperature were stronger under nutrient limitation, and the effects of nutrients and grazing were stronger at high temperature. Our study shows that the phytoplankton local SARs in lakes respond to both the independent and the interactive effects of resources, grazing and water temperature in a complex, unexpected way, and observations from long-term studies can deviate significantly from general theoretical expectations.
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Affiliation(s)
- Francesco Pomati
- Aquatic Ecology, Eawag: Swiss Federal Institute of Aquatic Science and Technology, Dübendorf, Switzerland.,Institute of Integrative Biology, ETH-Zurich, Zurich, Switzerland
| | - Jonathan B Shurin
- Department of Ecology Behavior and Evolution, University of California, San Diego, La Jolla, CA, United States
| | - Ken H Andersen
- Centre for Ocean Life, DTU Aqua, Technical University of Denmark, Lyngby, Denmark
| | - Christoph Tellenbach
- Aquatic Ecology, Eawag: Swiss Federal Institute of Aquatic Science and Technology, Dübendorf, Switzerland
| | - Andrew D Barton
- Department of Ecology Behavior and Evolution, University of California, San Diego, La Jolla, CA, United States.,Scripps Institution of Oceanography, La Jolla, CA, United States
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17
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Alvarez-Cobelas M, Rojo C, Benavent-Corai J. Long-Term Phytoplankton Dynamics in a Complex Temporal Realm. Sci Rep 2019; 9:15967. [PMID: 31685884 PMCID: PMC6828802 DOI: 10.1038/s41598-019-52333-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2018] [Accepted: 10/11/2019] [Indexed: 11/26/2022] Open
Abstract
Faced with an environment of accelerated change, the long-term dynamics of biotic communities can be approached to build a consistent and causal picture of the communities’ life. We have undertaken a 25-year monthly-sampling study on the phytoplankton of a meso-oligotrophic lake, paying attention to controlling factors of overall biomass (TB) and taxonomical group biomass (TGBs). Long-term series included decreased trends of TB and TGBs, and multi-scale periodicity. A decadal TB periodicity emerged related to nitrogen concentration and Cryptophytes. Annual periodicities were mainly related to air and water temperature controlling the abundance of Chlorophytes or Dinoflagellates. Intra-annual cycles could arise from autogenic processes. The analysis by periods revealed relevant dynamics (for example, Diatom periodicities), hidden in the analysis of the complete series. These results allow us to establish that: i) two organizational levels of phytoplankton change differently in time scales from months to decades; ii) controlling factors (climate, water physics and chemistry) act at different time scales and on different TGBs, and iii) different combinations of the “taxonomical group-control factor-trend and periodicity” set throughout the studied time explain total biomass dynamics. A holistic approach (multiple complementary analyses) is necessary to disentangle the different actors and relationships that explain non-stationary long-term phytoplankton dynamics.
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Affiliation(s)
- M Alvarez-Cobelas
- National Museum of Natural History (CSIC), c/ Serrano 115 dpdo, Madrid, E-28006, Spain.
| | - C Rojo
- Cavanilles Institute of Biodiversity and Evolutionary Biology, University of Valencia, c/ Catedrático José Beltrán 2, Paterna, Valencia, E-46980, Spain
| | - J Benavent-Corai
- Cavanilles Institute of Biodiversity and Evolutionary Biology, University of Valencia, c/ Catedrático José Beltrán 2, Paterna, Valencia, E-46980, Spain
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18
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de J Magalhães AA, da Luz LD, de Aguiar Junior TR. Environmental factors driving the dominance of the harmful bloom-forming cyanobacteria Microcystis and Aphanocapsa in a tropical water supply reservoir. WATER ENVIRONMENT RESEARCH : A RESEARCH PUBLICATION OF THE WATER ENVIRONMENT FEDERATION 2019; 91:1466-1478. [PMID: 31074893 DOI: 10.1002/wer.1141] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/15/2019] [Revised: 04/15/2019] [Accepted: 05/05/2019] [Indexed: 06/09/2023]
Abstract
Harmful cyanobacterial blooms in reservoirs have become a serious global issue for environmental health. However, dominance among different toxic cyanobacteria genera remains poorly understood, especially in tropical areas. We evaluated the influence of environmental factors, including total phosphorus, dissolved aluminum, water level, and precipitation on the change of the dominant genus from Microcystis to Aphanocapsa, in a hypereutrophic tropical reservoir, using 443 water samples over six years of field monitoring by applying generalized linear models (GLM). The results pointed out the prevalence of longer hydrologic retention time leading to enhanced water stability, and nutrients' accumulation into the hypolimnetic zones of the reservoir may have favored the ecophysiological advantages for the picocyanobacteria Aphanocapsa, which reached densities greater than 1 million/ml. In addition, this article also suggests that physical-chemical remediation methods applied for immobilizing phosphorus in the sediments of the reservoir may be low effective in limiting cyanobacterial growth. These findings are not only meaningful to the understanding of the dynamics of cyanobacterial genera but also to improve the management of eutrophic reservoirs in tropical regions. PRACTITIONER POINTS: We assessed cyanobacterial dominance changes based on 6-year field monitoring. First article addressing the dominance of Aphanocapsa spp. in a tropical reservoir. Species of Aphanocapsa responded better to hydrological changes in the reservoir. The use of remediators was accompanied by an increase in cyanobacteria biomass.
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Affiliation(s)
- Aline A de J Magalhães
- Department of Environmental Engineering, Federal University of Bahia (UFBA), Salvador, Bahia, Brazil
| | - Lafayette D da Luz
- Department of Environmental Engineering, Federal University of Bahia (UFBA), Salvador, Bahia, Brazil
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19
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Pálffy K, Vörös L. Phytoplankton functional composition shows higher seasonal variability in a large shallow lake after a eutrophic past. Ecosphere 2019. [DOI: 10.1002/ecs2.2684] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Affiliation(s)
- Károly Pálffy
- Balaton Limnological Institute MTA Centre for Ecological Research 3 Klebelsberg Kuno Street Tihany H‐8237 Hungary
- GINOP Sustainable Ecosystems Group MTA Centre for Ecological Research 3 Klebelsberg Kuno Street Tihany H‐8237 Hungary
| | - Lajos Vörös
- Balaton Limnological Institute MTA Centre for Ecological Research 3 Klebelsberg Kuno Street Tihany H‐8237 Hungary
- GINOP Sustainable Ecosystems Group MTA Centre for Ecological Research 3 Klebelsberg Kuno Street Tihany H‐8237 Hungary
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20
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Zhang M, Shi X, Yang Z, Yu Y, Shi L, Qin B. Long-term dynamics and drivers of phytoplankton biomass in eutrophic Lake Taihu. THE SCIENCE OF THE TOTAL ENVIRONMENT 2018; 645:876-886. [PMID: 30032083 DOI: 10.1016/j.scitotenv.2018.07.220] [Citation(s) in RCA: 44] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/03/2018] [Revised: 07/15/2018] [Accepted: 07/16/2018] [Indexed: 06/08/2023]
Abstract
Understanding the relative effect sizes of climate-related environmental variables and nutrients on the high annual variation in the phytoplankton biomass in eutrophic lakes is important for lake management efforts. In this study, we used a data set of phytoplankton dynamics in eutrophic Lake Taihu that cover more than two decades (1993-2015) to show the variation in and the drivers of phytoplankton biomass under complex, fluctuating environmental conditions. Our results showed that the phytoplankton biomass increased slowly over the studied period despite the recent decrease in nutrient levels. The distribution of the phytoplankton biomass expanded spatially towards the central lake region, and seasonally towards the autumn and winter. Nutrients were still the primary predictors of the long-term phytoplankton biomass trend. The effect size of climate-related variables was also high and close to the effect size of nutrients. Among the climate-related variables, wind speed and underwater available light were more important predictors than temperature. The biomass of the phytoplankton taxonomic groups showed different responses to the environmental variables based on their niches. However, the compensatory dynamics affecting biomass were weak at phylum level, and synchronous dynamics drove the variation in total biomass. Our findings highlight the effect of climate-related variables on the phytoplankton biomass in Lake Taihu, which has experienced high nutrient loadings and concentrations for more than two decades. Therefore, changes in climate-related variables, such as wind speed and underwater available light, should be considered when evaluating the amount that nutrients should be reduced in Lake Taihu for future lake management.
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Affiliation(s)
- Min Zhang
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, CAS, Nanjing 210008, China
| | - Xiaoli Shi
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, CAS, Nanjing 210008, China.
| | - Zhen Yang
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, CAS, Nanjing 210008, China
| | - Yang Yu
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, CAS, Nanjing 210008, China
| | - Limei Shi
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, CAS, Nanjing 210008, China
| | - Boqiang Qin
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, CAS, Nanjing 210008, China
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21
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Verbeek L, Gall A, Hillebrand H, Striebel M. Warming and oligotrophication cause shifts in freshwater phytoplankton communities. GLOBAL CHANGE BIOLOGY 2018; 24:4532-4543. [PMID: 29856108 DOI: 10.1111/gcb.14337] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2017] [Revised: 05/02/2018] [Accepted: 05/11/2018] [Indexed: 05/06/2023]
Abstract
While there is a lot of data on interactive effects of eutrophication and warming, to date, we lack data to generate reliable predictions concerning possible effects of nutrient decrease and temperature increase on community composition and functional responses. In recent years, a wide-ranging trend of nutrient decrease (re-oligotrophication) was reported for freshwater systems. Small lakes and ponds, in particular, show rapid responses to anthropogenic pressures and became model systems to investigate single as well as synergistic effects of warming and fertilization in situ and in experiments. Therefore, we set up an experiment to investigate the single as well as the interactive effects of nutrient reduction and gradual temperature increase on a natural freshwater phytoplankton community, using an experimental indoor mesocosm setup. Biomass production initially increased with warming but decreased with nutrient depletion. If nutrient supply was constant, biomass increased further, especially under warming conditions. Under low nutrient supply, we found a sharp transition from initially positive effects of warming to negative effects when resources became scarce. Warming reduced phytoplankton richness and evenness, whereas nutrient reduction at ambient temperature had positive effects on diversity. Our results indicate that temperature effects on freshwater systems will be altered by nutrient availability. These interactive effects of energy increase and resource decrease have major impacts on biodiversity and ecosystem function and thus need to be considered in environmental management plans.
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Affiliation(s)
- Laura Verbeek
- Institute for Chemistry and Biology of the Marine Environment, University of Oldenburg, Wilhelmshaven, Germany
| | - Andrea Gall
- Institute for Chemistry and Biology of the Marine Environment, University of Oldenburg, Wilhelmshaven, Germany
| | - Helmut Hillebrand
- Institute for Chemistry and Biology of the Marine Environment, University of Oldenburg, Wilhelmshaven, Germany
- Helmholtz Institute for Functional Marine Biodiversity at the University of Oldenburg (HIFMB), Oldenburg, Germany
| | - Maren Striebel
- Institute for Chemistry and Biology of the Marine Environment, University of Oldenburg, Wilhelmshaven, Germany
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Mantzouki E, Ibelings BW. The Principle and Value of the European Multi Lake Survey. ACTA ACUST UNITED AC 2018. [DOI: 10.1002/lob.10259] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Evanthia Mantzouki
- Department F.-A. Forel for Environmental and Aquatic Sciences, University of Geneva, Geneva, Switzerland
| | - Bas W. Ibelings
- Department F.-A. Forel for Environmental and Aquatic Sciences, University of Geneva, Geneva, Switzerland
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Dornelas M, Antão LH, Moyes F, Bates AE, Magurran AE, Adam D, Akhmetzhanova AA, Appeltans W, Arcos JM, Arnold H, Ayyappan N, Badihi G, Baird AH, Barbosa M, Barreto TE, Bässler C, Bellgrove A, Belmaker J, Benedetti‐Cecchi L, Bett BJ, Bjorkman AD, Błażewicz M, Blowes SA, Bloch CP, Bonebrake TC, Boyd S, Bradford M, Brooks AJ, Brown JH, Bruelheide H, Budy P, Carvalho F, Castañeda‐Moya E, Chen CA, Chamblee JF, Chase TJ, Siegwart Collier L, Collinge SK, Condit R, Cooper EJ, Cornelissen JHC, Cotano U, Kyle Crow S, Damasceno G, Davies CH, Davis RA, Day FP, Degraer S, Doherty TS, Dunn TE, Durigan G, Duffy JE, Edelist D, Edgar GJ, Elahi R, Elmendorf SC, Enemar A, Ernest SKM, Escribano R, Estiarte M, Evans BS, Fan T, Turini Farah F, Loureiro Fernandes L, Farneda FZ, Fidelis A, Fitt R, Fosaa AM, Daher Correa Franco GA, Frank GE, Fraser WR, García H, Cazzolla Gatti R, Givan O, Gorgone‐Barbosa E, Gould WA, Gries C, Grossman GD, Gutierréz JR, Hale S, Harmon ME, Harte J, Haskins G, Henshaw DL, Hermanutz L, Hidalgo P, Higuchi P, Hoey A, Van Hoey G, Hofgaard A, Holeck K, Hollister RD, Holmes R, Hoogenboom M, Hsieh C, Hubbell SP, Huettmann F, Huffard CL, Hurlbert AH, Macedo Ivanauskas N, Janík D, Jandt U, Jażdżewska A, Johannessen T, Johnstone J, Jones J, Jones FAM, Kang J, Kartawijaya T, Keeley EC, Kelt DA, Kinnear R, Klanderud K, Knutsen H, Koenig CC, Kortz AR, Král K, Kuhnz LA, Kuo C, Kushner DJ, Laguionie‐Marchais C, Lancaster LT, Min Lee C, Lefcheck JS, Lévesque E, Lightfoot D, Lloret F, Lloyd JD, López‐Baucells A, Louzao M, Madin JS, Magnússon B, Malamud S, Matthews I, McFarland KP, McGill B, McKnight D, McLarney WO, Meador J, Meserve PL, Metcalfe DJ, Meyer CFJ, Michelsen A, Milchakova N, Moens T, Moland E, Moore J, Mathias Moreira C, Müller J, Murphy G, Myers‐Smith IH, Myster RW, Naumov A, Neat F, Nelson JA, Paul Nelson M, Newton SF, Norden N, Oliver JC, Olsen EM, Onipchenko VG, Pabis K, Pabst RJ, Paquette A, Pardede S, Paterson DM, Pélissier R, Peñuelas J, Pérez‐Matus A, Pizarro O, Pomati F, Post E, Prins HHT, Priscu JC, Provoost P, Prudic KL, Pulliainen E, Ramesh BR, Mendivil Ramos O, Rassweiler A, Rebelo JE, Reed DC, Reich PB, Remillard SM, Richardson AJ, Richardson JP, van Rijn I, Rocha R, Rivera‐Monroy VH, Rixen C, Robinson KP, Ribeiro Rodrigues R, de Cerqueira Rossa‐Feres D, Rudstam L, Ruhl H, Ruz CS, Sampaio EM, Rybicki N, Rypel A, Sal S, Salgado B, Santos FAM, Savassi‐Coutinho AP, Scanga S, Schmidt J, Schooley R, Setiawan F, Shao K, Shaver GR, Sherman S, Sherry TW, Siciński J, Sievers C, da Silva AC, Rodrigues da Silva F, Silveira FL, Slingsby J, Smart T, Snell SJ, Soudzilovskaia NA, Souza GBG, Maluf Souza F, Castro Souza V, Stallings CD, Stanforth R, Stanley EH, Mauro Sterza J, Stevens M, Stuart‐Smith R, Rondon Suarez Y, Supp S, Yoshio Tamashiro J, Tarigan S, Thiede GP, Thorn S, Tolvanen A, Teresa Zugliani Toniato M, Totland Ø, Twilley RR, Vaitkus G, Valdivia N, Vallejo MI, Valone TJ, Van Colen C, Vanaverbeke J, Venturoli F, Verheye HM, Vianna M, Vieira RP, Vrška T, Quang Vu C, Van Vu L, Waide RB, Waldock C, Watts D, Webb S, Wesołowski T, White EP, Widdicombe CE, Wilgers D, Williams R, Williams SB, Williamson M, Willig MR, Willis TJ, Wipf S, Woods KD, Woehler EJ, Zawada K, Zettler ML, Hickler T. BioTIME: A database of biodiversity time series for the Anthropocene. GLOBAL ECOLOGY AND BIOGEOGRAPHY : A JOURNAL OF MACROECOLOGY 2018; 27:760-786. [PMID: 30147447 PMCID: PMC6099392 DOI: 10.1111/geb.12729] [Citation(s) in RCA: 152] [Impact Index Per Article: 25.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/09/2017] [Revised: 11/25/2017] [Accepted: 11/28/2017] [Indexed: 05/08/2023]
Abstract
MOTIVATION The BioTIME database contains raw data on species identities and abundances in ecological assemblages through time. These data enable users to calculate temporal trends in biodiversity within and amongst assemblages using a broad range of metrics. BioTIME is being developed as a community-led open-source database of biodiversity time series. Our goal is to accelerate and facilitate quantitative analysis of temporal patterns of biodiversity in the Anthropocene. MAIN TYPES OF VARIABLES INCLUDED The database contains 8,777,413 species abundance records, from assemblages consistently sampled for a minimum of 2 years, which need not necessarily be consecutive. In addition, the database contains metadata relating to sampling methodology and contextual information about each record. SPATIAL LOCATION AND GRAIN BioTIME is a global database of 547,161 unique sampling locations spanning the marine, freshwater and terrestrial realms. Grain size varies across datasets from 0.0000000158 km2 (158 cm2) to 100 km2 (1,000,000,000,000 cm2). TIME PERIOD AND GRAIN BioTIME records span from 1874 to 2016. The minimal temporal grain across all datasets in BioTIME is a year. MAJOR TAXA AND LEVEL OF MEASUREMENT BioTIME includes data from 44,440 species across the plant and animal kingdoms, ranging from plants, plankton and terrestrial invertebrates to small and large vertebrates. SOFTWARE FORMAT .csv and .SQL.
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Affiliation(s)
- Maria Dornelas
- Centre for Biological Diversity and Scottish Oceans Institute, School of Biology, University of St. AndrewsSt AndrewsUnited Kingdom
| | - Laura H. Antão
- Centre for Biological Diversity and Scottish Oceans Institute, School of Biology, University of St. AndrewsSt AndrewsUnited Kingdom
- Department of Biology and CESAMUniversidade de Aveiro, Campus Universitário de SantiagoAveiroPortugal
| | - Faye Moyes
- Centre for Biological Diversity and Scottish Oceans Institute, School of Biology, University of St. AndrewsSt AndrewsUnited Kingdom
| | - Amanda E. Bates
- National Oceanography Centre, University of Southampton Waterfront CampusSouthamptonUnited Kingdom
- Department of Ocean Sciences, Memorial University of NewfoundlandSt John'sNewfoundland and LabradorCanada
| | - Anne E. Magurran
- Centre for Biological Diversity and Scottish Oceans Institute, School of Biology, University of St. AndrewsSt AndrewsUnited Kingdom
| | - Dušan Adam
- Department of Forest Ecology, Silva Tarouca Research InstituteBrnoCzech Republic
| | | | - Ward Appeltans
- UNESCO, Intergovernmental Oceanographic Commission, IOC Project Office for IODEOostendeBelgium
| | | | - Haley Arnold
- Centre for Biological Diversity and Scottish Oceans Institute, School of Biology, University of St. AndrewsSt AndrewsUnited Kingdom
| | | | - Gal Badihi
- Centre for Biological Diversity and Scottish Oceans Institute, School of Biology, University of St. AndrewsSt AndrewsUnited Kingdom
| | - Andrew H. Baird
- ARC Centre of Excellence for Coral Reef Studies, James Cook UniversityTownsvilleQueenslandAustralia
| | - Miguel Barbosa
- Centre for Biological Diversity and Scottish Oceans Institute, School of Biology, University of St. AndrewsSt AndrewsUnited Kingdom
- Department of Biology and CESAMUniversidade de Aveiro, Campus Universitário de SantiagoAveiroPortugal
| | - Tiago Egydio Barreto
- Laboratório de Ecologia e Restauração Florestal, Fundação Espaço Eco, Piracicaba, São PauloBrazil
| | | | - Alecia Bellgrove
- School of Life and Environmental SciencesCentre for Integrative Ecology, Deakin UniversityWarrnamboolVictoriaAustralia
| | - Jonathan Belmaker
- School of Zoology, George S. Wise Faculty of Life SciencesTel Aviv UniversityTel AvivIsrael
| | | | - Brian J. Bett
- National Oceanography Centre, University of Southampton Waterfront CampusSouthamptonUnited Kingdom
| | - Anne D. Bjorkman
- Section for Ecoinformatics and Biodiversity, Department of BioscienceAarhus UniversityAarhusDenmark
| | - Magdalena Błażewicz
- Laboratory of Polar Biology and Oceanobiology, Faculty of Biology and Environmental ProtectionUniversity of ŁódźŁódźPoland
| | - Shane A. Blowes
- School of Zoology, George S. Wise Faculty of Life SciencesTel Aviv UniversityTel AvivIsrael
- German Centre for Integrative Biodiversity Research (iDiv) Halle‐Jena‐LeipzigLeipzigGermany
| | - Christopher P. Bloch
- Department of Biological SciencesBridgewater State UniversityBridgewaterMassachusetts
| | | | - Susan Boyd
- Centre for Biological Diversity and Scottish Oceans Institute, School of Biology, University of St. AndrewsSt AndrewsUnited Kingdom
| | - Matt Bradford
- CSIRO Land & WaterEcosciences Precinct, Dutton ParkQueenslandAustralia
| | - Andrew J. Brooks
- Marine Science Institute, University of CaliforniaSanta BarbaraCalifornia
| | - James H. Brown
- Department of BiologyUniversity of New MexicoAlbuquerqueNew Mexico
| | - Helge Bruelheide
- German Centre for Integrative Biodiversity Research (iDiv) Halle‐Jena‐LeipzigLeipzigGermany
- Institute of Biology/Geobotany and Botanical Garden, Martin‐Luther‐University Halle‐WittenbergHalleGermany
| | - Phaedra Budy
- Department of Watershed Sciences and the Ecology Center, US Geological Survey, UCFWRU and Utah State UniversityLoganUtah
| | - Fernando Carvalho
- Universidade do Extremo Sul Catarinense (PPG‐CA)CriciúmaSanta CatarinaBrazil
| | - Edward Castañeda‐Moya
- Southeast Environmental Research Center (OE 148), Florida International UniversityMiamiFlorida
| | - Chaolun Allen Chen
- Coral Reef Ecology and Evolution LabBiodiversity Research Centre, Academia SinicaTaipeiTaiwan
| | | | - Tory J. Chase
- ARC Centre of Excellence for Coral Reef Studies, James Cook UniversityTownsvilleQueenslandAustralia
- Marine Biology and Aquaculture, College of Science and EngineeringJames Cook UniversityDouglasQueenslandAustralia
| | | | | | - Richard Condit
- Center for Tropical Forest ScienceWashingtonDistrict of Columbia
| | - Elisabeth J. Cooper
- Biosciences Fisheries and EconomicsUiT‐ The Arctic University of NorwayTromsøNorway
| | - J. Hans C. Cornelissen
- Systems Ecology, Department of Ecological Science, Vrije UniversiteitAmsterdamThe Netherlands
| | | | - Shannan Kyle Crow
- The National Institute of Water and Atmospheric ResearchAucklandNew Zealand
| | - Gabriella Damasceno
- Lab of Vegetation Ecology, Instituto de Biociências, Universidade Estadual Paulista (UNESP), Rio ClaroBrazil
| | | | - Robert A. Davis
- School of ScienceEdith Cowan UniversityJoondalupWestern AustraliaAustralia
| | - Frank P. Day
- Department of Biological SciencesOld Dominion UniversityNorfolkVirginia
| | - Steven Degraer
- Royal Belgian Institute of Natural Sciences, Operational Directorate Natural Environment, Marine Ecology and ManagementBrusselsBelgium
- Marine Biology Research Group, Ghent UniversityGentBelgium
| | - Tim S. Doherty
- School of ScienceEdith Cowan UniversityJoondalupWestern AustraliaAustralia
- School of Life and Environmental SciencesCentre for Integrative Ecology (Burwood Campus), Deakin UniversityGeelongVictoriaAustralia
| | | | - Giselda Durigan
- Divisão de Florestas e Estações Experimentais, Floresta Estadual de Assis, Laboratório de Ecologia e Hidrologia Florestal, Instituto FlorestalSão PauloBrazil
| | - J. Emmett Duffy
- Tennenbaum Marine Observatories Network, Smithsonian InstitutionWashington, District of Columbia
| | - Dor Edelist
- National Institute of Oceanography, Tel‐ShikmonaHaifaIsrael
| | - Graham J. Edgar
- Institute for Marine and Antarctic Studies, University of TasmaniaHobartTasmaniaAustralia
| | - Robin Elahi
- Hopkins Marine Station, Stanford University, StanfordCalifornia
| | | | - Anders Enemar
- Department of Biological and Environmental SciencesUniversity of GothenburgGothenburgSweden
| | - S. K. Morgan Ernest
- Department of Wildlife Ecology and ConservationUniversity of FloridaGainesvilleFL
| | - Rubén Escribano
- Instituto Milenio de Oceanografía, Universidad de ConcepciónConcepciónChile
| | - Marc Estiarte
- CSIC, Global Ecology Unit CREAF‐CSIC‐UABBellaterraCataloniaSpain
- CREAF, Universitat Autònoma de BarcelonaCerdanyola del VallèsCataloniaSpain
| | - Brian S. Evans
- Migratory Bird Center, Smithsonian Conservation Biology Institute, National Zoological ParkWashingtonDistrict of Columbia
| | - Tung‐Yung Fan
- National Museum of Marine Biology and AquariumPingtung CountyTaiwan
| | - Fabiano Turini Farah
- Laboratório de Ecologia e Restauração Florestal, Escola Superior de Agricultura “Luiz de Queiroz”, Universidade de São PauloSão PauloBrazil
| | - Luiz Loureiro Fernandes
- Departamento de Oceanografia e Ecologia, Universidade Federal do Espírito Santo, Vitória, Espírito SantoBrazil
| | - Fábio Z. Farneda
- Centre for Ecology, Evolution and Environmental Changes – cE3c, Faculty of SciencesUniversity of LisbonLisbonPortugal
- Biological Dynamics of Forest Fragments Project, National Institute for Amazonian Research and Smithsonian Tropical Research InstituteManausBrazil
- Department of Ecology/PPGEFederal University of Rio de JaneiroRio de JaneiroBrazil
| | - Alessandra Fidelis
- Lab of Vegetation Ecology, Instituto de Biociências, Universidade Estadual Paulista (UNESP), Rio ClaroBrazil
| | - Robert Fitt
- School of Biological SciencesUniversity of AberdeenAberdeenUnited Kingdom
| | - Anna Maria Fosaa
- Botanical Department, Faroese Museum of Natural HistoryTorshavnFaroe Islands
| | | | - Grace E. Frank
- Marine Biology and Aquaculture, College of Science and EngineeringJames Cook UniversityDouglasQueenslandAustralia
| | | | - Hernando García
- Alexander von Humboldt Biological Resources Research InstituteBogotá DCColombia
| | | | - Or Givan
- School of Zoology, George S. Wise Faculty of Life SciencesTel Aviv UniversityTel AvivIsrael
| | - Elizabeth Gorgone‐Barbosa
- Lab of Vegetation Ecology, Instituto de Biociências, Universidade Estadual Paulista (UNESP), Rio ClaroBrazil
| | - William A. Gould
- USDA Forest Service, 65 USDA Forest Service, International Institute of Tropical ForestrySan JuanPuerto Rico
| | - Corinna Gries
- Center for Limnology, University of WisconsinMadisonWisconsin
| | - Gary D. Grossman
- The Warnell School of Forestry and Natural ResourcesUniversity of GeorgiaAthensGeorgia
| | - Julio R. Gutierréz
- Departamento de Biología, Facultad de Ciencias, Universidad de La SerenaLa SerenaChile
- Centro de Estudios Avanzados en Zonas Aridas (CEAZA)La SerenaChile
- Institute of Ecology and Biodiversity (IEB)SantiagoChile
| | - Stephen Hale
- U.S. Environmental Protection Agency, Office of Research and Development, National Health and Environmental Effects Research Laboratory, Atlantic Ecology DivisionNarragansettRhode Island
| | - Mark E. Harmon
- Department of Forest Ecosystems and SocietyOregon State UniversityCorvallisOregon
| | - John Harte
- The Energy and Resources Group and The Department of Environmental Science, Policy and ManagementUniversity of CaliforniaBerkeleyCalifornia
| | - Gary Haskins
- Cetacean Research & Rescue UnitBanffUnited Kingdom
| | - Donald L. Henshaw
- U.S. Forest Service Pacific Northwest Research LaboratoryCorvallisOregon
| | - Luise Hermanutz
- Memorial University, St John'sNewfoundland and LabradorCanada
| | - Pamela Hidalgo
- Instituto Milenio de Oceanografía, Universidad de ConcepciónConcepciónChile
| | - Pedro Higuchi
- Laboratório de Dendrologia e Fitossociologia, Universidade do Estado de Santa CatarinaFlorianópolisSanta CatarinaBrazil
| | - Andrew Hoey
- ARC Centre of Excellence for Coral Reef Studies, James Cook UniversityTownsvilleQueenslandAustralia
| | - Gert Van Hoey
- Department of Aquatic Environment and Quality, Flanders Research Institute for Agriculture, Fisheries and FoodOostendeBelgium
| | | | - Kristen Holeck
- Department of Natural Resources and Cornell Biological Field StationCornell UniversityIthacaNew York
| | | | | | - Mia Hoogenboom
- ARC Centre of Excellence for Coral Reef Studies, James Cook UniversityTownsvilleQueenslandAustralia
- Marine Biology and Aquaculture, College of Science and EngineeringJames Cook UniversityDouglasQueenslandAustralia
| | - Chih‐hao Hsieh
- Institute of Oceanography, National Taiwan UniversityTaipeiTaiwan
| | | | - Falk Huettmann
- EWHALE lab‐ Biology and Wildlife DepartmentInstitute of Arctic Biology, University of AlaskaFairbanksAlaska
| | | | - Allen H. Hurlbert
- Department of BiologyUniversity of North CarolinaChapel HillNorth Carolina
| | | | - David Janík
- Department of Forest Ecology, Silva Tarouca Research InstituteBrnoCzech Republic
| | - Ute Jandt
- German Centre for Integrative Biodiversity Research (iDiv) Halle‐Jena‐LeipzigLeipzigGermany
- Institute of Biology/Geobotany and Botanical Garden, Martin‐Luther‐University Halle‐WittenbergHalleGermany
| | - Anna Jażdżewska
- Laboratory of Polar Biology and Oceanobiology, Faculty of Biology and Environmental ProtectionUniversity of ŁódźŁódźPoland
| | | | - Jill Johnstone
- Department of BiologyUniversity of SaskatchewanSaskatoonSaskatchewanCanada
| | - Julia Jones
- College of Earth, Ocean, and Atmospheric Sciences, Oregon State UniversityCorvallisOregon
| | - Faith A. M. Jones
- Centre for Biological Diversity and Scottish Oceans Institute, School of Biology, University of St. AndrewsSt AndrewsUnited Kingdom
| | - Jungwon Kang
- Centre for Biological Diversity and Scottish Oceans Institute, School of Biology, University of St. AndrewsSt AndrewsUnited Kingdom
| | | | | | - Douglas A. Kelt
- Department of WildlifeFish, and Conservation Biology, University of California, DavisDavisCalifornia
| | - Rebecca Kinnear
- Centre for Biological Diversity and Scottish Oceans Institute, School of Biology, University of St. AndrewsSt AndrewsUnited Kingdom
- Shetland Oil Terminal Environmental Advisory Group (SOTEAG)St AndrewsUnited Kingdom
| | - Kari Klanderud
- Faculty of Environmental Sciences and Natural Resource ManagementNorwegian University of Life SciencesÅsNorway
| | - Halvor Knutsen
- Institute of Marine ResearchHisNorway
- Department of Natural Sciences, Faculty of Engineering and Science, Centre for Coastal Research, University of AgderKristiansandNorway
| | | | - Alessandra R. Kortz
- Centre for Biological Diversity and Scottish Oceans Institute, School of Biology, University of St. AndrewsSt AndrewsUnited Kingdom
| | - Kamil Král
- Department of Forest Ecology, Silva Tarouca Research InstituteBrnoCzech Republic
| | - Linda A. Kuhnz
- Monterey Bay Aquarium Research InstituteMoss LandingCalifornia
| | - Chao‐Yang Kuo
- ARC Centre of Excellence for Coral Reef Studies, James Cook UniversityTownsvilleQueenslandAustralia
| | - David J. Kushner
- Channel Islands National Park, U. S. National Park ServiceCalifornia, VenturaCalifornia
| | | | | | - Cheol Min Lee
- Forest and Climate Change Adaptation LaboratoryCenter for Forest and Climate Change, National Institute of Forest ScienceSeoulRepublic of Korea
| | - Jonathan S. Lefcheck
- Department of Biological SciencesVirginia Institute of Marine Science, The College of William & Mary, Gloucester PointVirginia
| | - Esther Lévesque
- Département des sciences de l'environnementUniversité du Québec à Trois‐Rivières and Centre d’études nordiquesQuébecCanada
| | - David Lightfoot
- Department of BiologyMuseum of Southwestern Biology, University of New MexicoAlbuquerqueNew Mexico
| | - Francisco Lloret
- CREAF, Universitat Autònoma de BarcelonaCerdanyola del VallèsCataloniaSpain
| | | | - Adrià López‐Baucells
- Centre for Ecology, Evolution and Environmental Changes – cE3c, Faculty of SciencesUniversity of LisbonLisbonPortugal
- Biological Dynamics of Forest Fragments Project, National Institute for Amazonian Research and Smithsonian Tropical Research InstituteManausBrazil
- Museu de Ciències Naturals de GranollersCatalunyaSpain
| | | | - Joshua S. Madin
- Hawai‘i Institute of Marine Biology, University of Hawai‘i at Mānoa, KaneoheHawai‘iUSA
- Department of Biological SciencesMacquarie UniversitySydneyNew South WalesAustralia
| | | | - Shahar Malamud
- School of Zoology, George S. Wise Faculty of Life SciencesTel Aviv UniversityTel AvivIsrael
| | - Iain Matthews
- Centre for Biological Diversity and Scottish Oceans Institute, School of Biology, University of St. AndrewsSt AndrewsUnited Kingdom
| | | | - Brian McGill
- School of Biology and EcologySustainability Solutions Initiative, University of MaineOronoMaine
| | | | - William O. McLarney
- Stream Biomonitoring Program, Mainspring Conservation TrustFranklinNorth Carolina
| | - Jason Meador
- Stream Biomonitoring Program, Mainspring Conservation TrustFranklinNorth Carolina
| | | | | | - Christoph F. J. Meyer
- Centre for Ecology, Evolution and Environmental Changes – cE3c, Faculty of SciencesUniversity of LisbonLisbonPortugal
- Biological Dynamics of Forest Fragments Project, National Institute for Amazonian Research and Smithsonian Tropical Research InstituteManausBrazil
- Ecosystems and Environment Research Centre (EERC), School of Environment and Life Sciences, University of SalfordSalfordUnited Kingdom
| | - Anders Michelsen
- Terrestrial Ecology Section, Department of Biology, University of CopenhagenCopenhagenDenmark
| | - Nataliya Milchakova
- Laboratory of Phytoresources, Kovalevsky Institute of Marine Biological Research of RAS (IMBR)SevastopolRussia
| | - Tom Moens
- Marine Biology Research Group, Ghent UniversityGentBelgium
| | - Even Moland
- Institute of Marine ResearchHisNorway
- Department of Natural Sciences, Faculty of Engineering and Science, Centre for Coastal Research, University of AgderKristiansandNorway
| | - Jon Moore
- Shetland Oil Terminal Environmental Advisory Group (SOTEAG)St AndrewsUnited Kingdom
- Aquatic Survey & Monitoring Ltd. ASMLDurhamUnited Kingdom
| | | | - Jörg Müller
- Bavarian Forest National ParkGrafenauGermany
- Field Station Fabrikschleichach, University of WürzburgRauhenebrachGermany
| | - Grace Murphy
- Department of BiologyDalhousie UniversityHalifaxNova ScotiaCanada
| | | | | | - Andrew Naumov
- Zoological Institute, Russian Academy SciencesSt PetersburgRussia
| | - Francis Neat
- Marine Scotland, Marine LaboratoryScottish GovernmentEdinburghUnited Kingdom
| | - James A. Nelson
- Department of BiologyUniversity of Louisiana at LafayetteLafayetteLouisiana
| | - Michael Paul Nelson
- Department of Forest Ecosystems and SocietyOregon State UniversityCorvallisOregon
| | | | - Natalia Norden
- Alexander von Humboldt Biological Resources Research InstituteBogotá DCColombia
| | - Jeffrey C. Oliver
- University of Arizona Health Sciences Library, University of ArizonaTucsonArizona
| | - Esben M. Olsen
- Institute of Marine ResearchHisNorway
- Department of Natural Sciences, Faculty of Engineering and Science, Centre for Coastal Research, University of AgderKristiansandNorway
| | | | - Krzysztof Pabis
- Laboratory of Polar Biology and Oceanobiology, Faculty of Biology and Environmental ProtectionUniversity of ŁódźŁódźPoland
| | - Robert J. Pabst
- Department of Forest Ecosystems and SocietyOregon State UniversityCorvallisOregon
| | - Alain Paquette
- Center for Forest Research, Université du Québec à Montréal (UQAM)MontrealQuebecCanada
| | - Sinta Pardede
- Wildlife Conservation Society Indonesia ProgramBogorIndonesia
| | - David M. Paterson
- Centre for Biological Diversity and Scottish Oceans Institute, School of Biology, University of St. AndrewsSt AndrewsUnited Kingdom
- Shetland Oil Terminal Environmental Advisory Group (SOTEAG)St AndrewsUnited Kingdom
| | - Raphaël Pélissier
- UMR AMAP, IRD, CIRAD, CNRS, INRA, Montpellier UniversityMontpellierFrance
| | - Josep Peñuelas
- CSIC, Global Ecology Unit CREAF‐CSIC‐UABBellaterraCataloniaSpain
- CREAF, Universitat Autònoma de BarcelonaCerdanyola del VallèsCataloniaSpain
| | - Alejandro Pérez‐Matus
- Subtidal Ecology Laboratory & Center for Marine Conservation, Estación Costera de Investigaciones MarinasFacultad de Ciencias Biológicas, Pontificia Universidad Católica de ChileSantiagoCasillaChile
| | - Oscar Pizarro
- Australian Centre of Field Robotics, University of SydneySydneyNew South WalesAustralia
| | - Francesco Pomati
- Department of Aquatic EcologyEawag: Swiss Federal Institute of Aquatic Science and TechnologySwitzerland
| | - Eric Post
- Department of WildlifeFish, and Conservation Biology, University of California, DavisDavisCalifornia
| | | | - John C. Priscu
- Department of Land Resources and Environmental SciencesMontana State UniversityBozemanMontana
| | - Pieter Provoost
- UNESCO, Intergovernmental Oceanographic Commission, IOC Project Office for IODEOostendeBelgium
| | | | | | - B. R. Ramesh
- Department of EcologyFrench Institute of PondicherryPuducherryIndia
| | | | - Andrew Rassweiler
- Channel Islands National Park, U. S. National Park ServiceCalifornia, VenturaCalifornia
| | - Jose Eduardo Rebelo
- Ichthyology Laboratory, Fisheries and AquacultureUniversity of AveiroAveiroPortugal
| | - Daniel C. Reed
- Marine Science Institute, University of CaliforniaSanta BarbaraCalifornia
| | - Peter B. Reich
- Department of Forest Resources, University of MinnesotaSt PaulMinnesota
- Hawkesbury Institute for the Environment, Western Sydney UniversityPenrithNew South WalesAustralia
| | - Suzanne M. Remillard
- Department of Forest Ecosystems and SocietyOregon State UniversityCorvallisOregon
| | - Anthony J. Richardson
- CSIRO Oceans and AtmosphereQueensland, BioSciences Precinct (QBP)St Lucia, BrisbaneQldAustralia
- Centre for Applications in Natural Resource Mathematics, The University of QueenslandSt LuciaQueenslandAustralia
| | | | - Itai van Rijn
- School of Zoology, George S. Wise Faculty of Life SciencesTel Aviv UniversityTel AvivIsrael
| | - Ricardo Rocha
- Centre for Ecology, Evolution and Environmental Changes – cE3c, Faculty of SciencesUniversity of LisbonLisbonPortugal
- Biological Dynamics of Forest Fragments Project, National Institute for Amazonian Research and Smithsonian Tropical Research InstituteManausBrazil
- Metapopulation Research Centre, Faculty of Biosciences, University of HelsinkiHelsinkiFinland
| | - Victor H. Rivera‐Monroy
- Department of Oceanography and Coastal Sciences, College of the Coast and EnvironmentLouisiana State UniversityBaton RougeLouisiana
| | - Christian Rixen
- Swiss Federal Institute for Forest, Snow and Landscape ResearchDavos DorfSwitzerland
| | | | - Ricardo Ribeiro Rodrigues
- Laboratório de Ecologia e Restauração Florestal, Escola Superior de Agricultura “Luiz de Queiroz”, Universidade de São PauloSão PauloBrazil
| | - Denise de Cerqueira Rossa‐Feres
- Departamento de Zoologia e Botânica, Universidade Estadual Paulista – UNESPCâmpus São José do Rio Preto, São José do Rio PretoBrazil
| | - Lars Rudstam
- Department of Natural Resources and Cornell Biological Field StationCornell UniversityIthacaNew York
| | - Henry Ruhl
- National Oceanography Centre, University of Southampton Waterfront CampusSouthamptonUnited Kingdom
| | - Catalina S. Ruz
- Subtidal Ecology Laboratory & Center for Marine Conservation, Estación Costera de Investigaciones MarinasFacultad de Ciencias Biológicas, Pontificia Universidad Católica de ChileSantiagoCasillaChile
| | - Erica M. Sampaio
- Biological Dynamics of Forest Fragments Project, National Institute for Amazonian Research and Smithsonian Tropical Research InstituteManausBrazil
- Department of Animal Physiology, Eberhard Karls University TübingenTübingenGermany
| | - Nancy Rybicki
- National Research Program, U.S. Geological SurveyRestonVirginia
| | - Andrew Rypel
- Wisconsin Department of Natural Resources and Center for LimnologyUniversity of Wisconsin‐MadisonMadisonWisconsin
| | - Sofia Sal
- Department of Life SciencesImperial College LondonAscotBerkshireUnited Kingdom
| | - Beatriz Salgado
- Alexander von Humboldt Biological Resources Research InstituteBogotá DCColombia
| | | | - Ana Paula Savassi‐Coutinho
- Departamento de Ciências Biológicas, Escola Superior de Agricultura ‘Luiz de Queiroz’, Universidade de São PauloSão PauloBrazil
| | - Sara Scanga
- Department of BiologyUtica CollegeUticaNew York
| | - Jochen Schmidt
- The National Institute of Water and Atmospheric ResearchAucklandNew Zealand
| | - Robert Schooley
- Wildlife Ecology and Conservation, Department of Natural Resources and Environmental SciencesUniversity of IllinoisChampaignIllinois
| | | | - Kwang‐Tsao Shao
- Biodiversity Research Center, Academia SinicaNankang, TaipeiTaiwan
| | | | | | | | - Jacek Siciński
- Laboratory of Polar Biology and Oceanobiology, Faculty of Biology and Environmental ProtectionUniversity of ŁódźŁódźPoland
| | - Caya Sievers
- Centre for Biological Diversity and Scottish Oceans Institute, School of Biology, University of St. AndrewsSt AndrewsUnited Kingdom
| | - Ana Carolina da Silva
- Laboratório de Dendrologia e Fitossociologia, Universidade do Estado de Santa CatarinaFlorianópolisSanta CatarinaBrazil
| | | | | | - Jasper Slingsby
- Department of Biological Sciences, Centre for Statistics in Ecology, Environment and ConservationUniversity of CapeTownRondeboschSouth Africa
- Fynbos Node, South African Environmental Observation NetworkClaremontSouth Africa
| | - Tracey Smart
- Coastal Finfish Section, South Carolina Department of Natural Resources, Marine Resources Research InstituteCharlestonSouth Carolina
| | - Sara J. Snell
- Department of BiologyUniversity of North CarolinaChapel HillNorth Carolina
| | - Nadejda A. Soudzilovskaia
- Conservation Biology DepartmentInstitute of Environmental Studies, CML, Leiden UniversityLeidenThe Netherlands
| | - Gabriel B. G. Souza
- Laboratório de Biologia e Tecnologia Pesqueira, Universidade Federal do Rio de JaneiroRio de JaneiroBrazil
| | | | - Vinícius Castro Souza
- Laboratório de Ecologia e Restauração Florestal, Escola Superior de Agricultura “Luiz de Queiroz”, Universidade de São PauloSão PauloBrazil
| | | | - Rowan Stanforth
- Centre for Biological Diversity and Scottish Oceans Institute, School of Biology, University of St. AndrewsSt AndrewsUnited Kingdom
| | | | | | - Maarten Stevens
- INBO, Research Institute for Nature and ForestBrusselsBelgium
| | - Rick Stuart‐Smith
- Institute for Marine and Antarctic Studies, University of TasmaniaHobartTasmaniaAustralia
| | - Yzel Rondon Suarez
- Centro de Estudos em Recursos Naturais, Universidade Estadual de Mato Grosso do SulDouradosMato Grosso do SulBrazil
| | - Sarah Supp
- School of Biology and EcologyUniversity of MaineOronoMaine
| | | | | | - Gary P. Thiede
- Department of Watershed Sciences and the Ecology Center, US Geological Survey, UCFWRU and Utah State UniversityLoganUtah
| | - Simon Thorn
- Field Station Fabrikschleichach, University of WürzburgRauhenebrachGermany
| | - Anne Tolvanen
- Natural Resources Institute Finland, University of OuluOuluFinland
| | | | - Ørjan Totland
- Department of BiologyUniversity of BergenBergenNorway
| | - Robert R. Twilley
- Department of Oceanography and Coastal Sciences, College of the Coast and EnvironmentLouisiana State UniversityBaton RougeLouisiana
| | | | - Nelson Valdivia
- Universidad Austral de Chile and Centro FONDAP en Dinámica de Ecosistemas Marinos de Altas Latitudes (IDEAL)ValdiviaChile
| | | | | | - Carl Van Colen
- Marine Biology Research Group, Ghent UniversityGentBelgium
| | - Jan Vanaverbeke
- Royal Belgian Institute of Natural Sciences, Operational Directorate Natural Environment, Marine Ecology and ManagementBrusselsBelgium
| | - Fabio Venturoli
- Escola de Agronomia, Universidade Federal de GoiásGoiâniaBrazil
| | - Hans M. Verheye
- Department of Environmental AffairsOceans and Coastal ResearchCape TownSouth Africa
- Department of Biological SciencesMarine Research InstituteUniversity of Cape TownCape TownSouth Africa
| | - Marcelo Vianna
- Laboratório de Biologia e Tecnologia Pesqueira, Universidade Federal do Rio de JaneiroRio de JaneiroBrazil
| | - Rui P. Vieira
- National Oceanography Centre, University of Southampton Waterfront CampusSouthamptonUnited Kingdom
| | - Tomáš Vrška
- Department of Forest Ecology, Silva Tarouca Research InstituteBrnoCzech Republic
| | - Con Quang Vu
- Institute of Ecology and Biological Resources, VASTHanoiVietnam
| | - Lien Van Vu
- Vietnam National Museum of NatureHanoiVietnam
- Graduate University of Science and Technology, VASTHanoiVietnam
| | - Robert B. Waide
- Department of BiologyUniversity of New MexicoAlbuquerqueNew Mexico
| | - Conor Waldock
- National Oceanography Centre, University of Southampton Waterfront CampusSouthamptonUnited Kingdom
| | - Dave Watts
- CSIRO Oceans and Atmosphere FlagshipHobartTasmaniaAustralia
| | - Sara Webb
- Biology Department, Drew UniversityMadisonNew Jersey
- Environmental Studies Department, Drew UniversityMadisonNew Jersey
| | | | - Ethan P. White
- Department of Wildlife Ecology & ConservationUniversity of FloridaGainesvilleFlorida
- Informatics Institute, University of FloridaGainesvilleFlorida
| | | | - Dustin Wilgers
- Department of Natural SciencesMcPherson CollegeMcPhersonKansas
| | - Richard Williams
- Australian Antarctic Division, Channel HighwayKingstonTasmaniaAustralia
| | - Stefan B. Williams
- Australian Centre of Field Robotics, University of SydneySydneyNew South WalesAustralia
| | | | - Michael R. Willig
- Department of Ecology & Evolutionary Biology, Center for Environmental Sciences & EngineeringUniversity of ConnecticutMansfieldConnecticut
| | - Trevor J. Willis
- Institute of Marine Sciences, School of Biological Sciences, University of PortsmouthPortsmouthUnited Kingdom
| | - Sonja Wipf
- Research Team Mountain Ecosystems, WSL Institute for Snow and Avalanche Research SLFDavosSwitzerland
| | | | - Eric J. Woehler
- Institute for Marine and Antarctic Studies, University of TasmaniaHobartTasmaniaAustralia
| | - Kyle Zawada
- Centre for Biological Diversity and Scottish Oceans Institute, School of Biology, University of St. AndrewsSt AndrewsUnited Kingdom
- Department of Biological SciencesMacquarie UniversitySydneyNew South WalesAustralia
| | - Michael L. Zettler
- Leibniz Institute for Baltic Sea Research Warnemünde, Seestr. 15, D‐18119 RostockGermany
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Thomas MK, Fontana S, Reyes M, Kehoe M, Pomati F. The predictability of a lake phytoplankton community, over time-scales of hours to years. Ecol Lett 2018. [DOI: 10.1111/ele.12927] [Citation(s) in RCA: 49] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Mridul K. Thomas
- Department of Aquatic Ecology; Eawag: Swiss Federal Institute of Aquatic Science and Technology; Dübendorf Switzerland
- Centre for Ocean Life; DTU Aqua; Technical University of Denmark; Lyngby Denmark
| | - Simone Fontana
- Department of Aquatic Ecology; Eawag: Swiss Federal Institute of Aquatic Science and Technology; Dübendorf Switzerland
- Biodiversity and Conservation Biology; Swiss Federal Research Institute WSL; Birmensdorf Switzerland
| | - Marta Reyes
- Department of Aquatic Ecology; Eawag: Swiss Federal Institute of Aquatic Science and Technology; Dübendorf Switzerland
| | - Michael Kehoe
- Global Institute for Water Security and School of Environment and Sustainability; University of Saskatchewan; Saskatechwan Saskatoon Canada
| | - Francesco Pomati
- Department of Aquatic Ecology; Eawag: Swiss Federal Institute of Aquatic Science and Technology; Dübendorf Switzerland
- Institute of Integrative Biology; Swiss Federal Institute of Technology (ETH); Zürich Switzerland
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25
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Monchamp ME, Spaak P, Domaizon I, Dubois N, Bouffard D, Pomati F. Homogenization of lake cyanobacterial communities over a century of climate change and eutrophication. Nat Ecol Evol 2017; 2:317-324. [DOI: 10.1038/s41559-017-0407-0] [Citation(s) in RCA: 85] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2017] [Accepted: 11/07/2017] [Indexed: 01/11/2023]
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26
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Fontana S, Thomas MK, Moldoveanu M, Spaak P, Pomati F. Individual-level trait diversity predicts phytoplankton community properties better than species richness or evenness. ISME JOURNAL 2017; 12:356-366. [PMID: 28972571 PMCID: PMC5776449 DOI: 10.1038/ismej.2017.160] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/11/2017] [Revised: 07/15/2017] [Accepted: 08/21/2017] [Indexed: 11/09/2022]
Abstract
Understanding how microbial diversity influences ecosystem properties is of paramount importance. Cellular traits-which determine responses to the abiotic and biotic environment-may help us rigorously link them. However, our capacity to measure traits in natural communities has thus far been limited. Here we compared the predictive power of trait richness (trait space coverage), evenness (regularity in trait distribution) and divergence (prevalence of extreme phenotypes) derived from individual-based measurements with two species-level metrics (taxonomic richness and evenness) when modelling the productivity of natural phytoplankton communities. Using phytoplankton data obtained from 28 lakes sampled at different spatial and temporal scales, we found that the diversity in individual-level morphophysiological traits strongly improved our ability to predict community resource-use and biomass yield. Trait evenness-the regularity in distribution of individual cells/colonies within the trait space-was the strongest predictor, exhibiting a robust negative relationship across scales. Our study suggests that quantifying individual microbial phenotypes in trait space may help us understand how to link physiology to ecosystem-scale processes. Elucidating the mechanisms scaling individual-level trait variation to microbial community dynamics could there improve our ability to forecast changes in ecosystem properties across environmental gradients.
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Affiliation(s)
- Simone Fontana
- Department of Aquatic Ecology, Eawag, Swiss Federal Institute of Aquatic Science and Technology, Dübendorf, Switzerland.,Biodiversity and Conservation Biology, Swiss Federal Institute for Forest, Snow and Landscape Research WSL, Birmensdorf, Switzerland
| | - Mridul Kanianthara Thomas
- Department of Aquatic Ecology, Eawag, Swiss Federal Institute of Aquatic Science and Technology, Dübendorf, Switzerland
| | - Mirela Moldoveanu
- Department of Ecology, Taxonomy and Nature Conservation, Institute of Biology Bucharest, Romanian Academy, Bucharest, Romania
| | - Piet Spaak
- Department of Aquatic Ecology, Eawag, Swiss Federal Institute of Aquatic Science and Technology, Dübendorf, Switzerland.,Institute of Integrative Biology, Swiss Federal Institute of Technology (ETH), Zürich, Switzerland
| | - Francesco Pomati
- Department of Aquatic Ecology, Eawag, Swiss Federal Institute of Aquatic Science and Technology, Dübendorf, Switzerland.,Institute of Integrative Biology, Swiss Federal Institute of Technology (ETH), Zürich, Switzerland
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27
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Long-Term Trends and Temporal Synchrony in Plankton Richness, Diversity and Biomass Driven by Re-Oligotrophication and Climate across 17 Danish Lakes. WATER 2016. [DOI: 10.3390/w8100427] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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28
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García-Mozo H, Oteros JA, Galán C. Impact of land cover changes and climate on the main airborne pollen types in Southern Spain. THE SCIENCE OF THE TOTAL ENVIRONMENT 2016; 548-549:221-228. [PMID: 26802350 DOI: 10.1016/j.scitotenv.2016.01.005] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/01/2015] [Revised: 12/17/2015] [Accepted: 01/04/2016] [Indexed: 05/21/2023]
Abstract
Airborne pollen concentrations strongly correlate with flowering intensity of wind-pollinated species growing at and around monitoring sites. The pollen spectrum, and the variations in its composition and concentrations, is influenced by climatic features and by available nutritional resources but it is also determined by land use and its changes. The first factor influence is well known on aerobiological researches but the impact of land cover changes has been scarcely studied until now. This paper reports on a study carried out in Southern Spain (Córdoba city) examining airborne pollen trends over a 15-year period and it explores the possible links both to changes in land use and to climate variations. The Seasonal-Trend Decomposition procedure based on Loess (STL) which decomposes long-term data series into smaller seasonal component patterns was applied. Trends were compared with recorded changes in land use at varying distances from the city in order to determine their possible influence on pollen-count variations. The influence of climate-related factors was determined by means of non-parametric correlation analysis. The STL method proved highly effective for extracting trend components from pollen time series, because their features vary widely and can change quickly in a short term. Results revealed mixed trends depending on the taxa and reflecting fluctuations in land cover and/or climate. A significant rising trend in Olea pollen counts was observed, attributable both to the increasing olive-growing area but also to changes in temperature and rainfall. Poaceae pollen concentrations also increased, due largely to an expansion of heterogeneous agricultural areas and to an increase in pollen season length positively influenced by rainfall and temperature. By contrast, the significant declining trend observed for pollen from ruderal taxa, such as Amaranthaceae, Rumex, Plantago and Urticaceae, may be linked to changes in urban planning strategies with a higher building pressure.
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Affiliation(s)
- Herminia García-Mozo
- Department of Botany, Ecology and Plant Physiology, University of Córdoba, Spain.
| | - Jose Antonio Oteros
- Department of Botany, Ecology and Plant Physiology, University of Córdoba, Spain; Center of Allergy & Environment (ZAUM), Helmholtz Zentrum München, Technische Universität München, Germany
| | - Carmen Galán
- Department of Botany, Ecology and Plant Physiology, University of Córdoba, Spain
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29
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Blue-Green Algae in a “Greenhouse Century”? New Insights from Field Data on Climate Change Impacts on Cyanobacteria Abundance. Ecosystems 2015. [DOI: 10.1007/s10021-014-9837-6] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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30
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Vasseur DA, Fox JW, Gonzalez A, Adrian R, Beisner BE, Helmus MR, Johnson C, Kratina P, Kremer C, de Mazancourt C, Miller E, Nelson WA, Paterson M, Rusak JA, Shurin JB, Steiner CF. Synchronous dynamics of zooplankton competitors prevail in temperate lake ecosystems. Proc Biol Sci 2014; 281:20140633. [PMID: 24966312 PMCID: PMC4083788 DOI: 10.1098/rspb.2014.0633] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2014] [Accepted: 06/04/2014] [Indexed: 11/12/2022] Open
Abstract
Although competing species are expected to exhibit compensatory dynamics (negative temporal covariation), empirical work has demonstrated that competitive communities often exhibit synchronous dynamics (positive temporal covariation). This has led to the suggestion that environmental forcing dominates species dynamics; however, synchronous and compensatory dynamics may appear at different length scales and/or at different times, making it challenging to identify their relative importance. We compiled 58 long-term datasets of zooplankton abundance in north-temperate and sub-tropical lakes and used wavelet analysis to quantify general patterns in the times and scales at which synchronous/compensatory dynamics dominated zooplankton communities in different regions and across the entire dataset. Synchronous dynamics were far more prevalent at all scales and times and were ubiquitous at the annual scale. Although we found compensatory dynamics in approximately 14% of all combinations of time period/scale/lake, there were no consistent scales or time periods during which compensatory dynamics were apparent across different regions. Our results suggest that the processes driving compensatory dynamics may be local in their extent, while those generating synchronous dynamics operate at much larger scales. This highlights an important gap in our understanding of the interaction between environmental and biotic forces that structure communities.
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Affiliation(s)
- David A Vasseur
- Department of Ecology and Evolutionary Biology, Yale University, New Haven, CT 06520, USA
| | - Jeremy W Fox
- Department of Biological Sciences, University of Calgary, Calgary, Alberta, Canada T2N 1N4
| | - Andrew Gonzalez
- Department of Biology, McGill University, Montreal, Quebec, Canada
| | - Rita Adrian
- Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Berlin, Germany
| | - Beatrix E Beisner
- Department of Biological Sciences, University of Quebec at Montreal, Montreal, Quebec, Canada H3C 3P8
| | - Matthew R Helmus
- Department of Animal Ecology, Amsterdam Global Change Institute, Vrije Universiteit, Amsterdam 1081 HV, Netherlands
| | - Catherine Johnson
- Fisheries and Oceans Canada, Bedford Institute of Oceanography, Dartmouth, Nova Scotia, Canada B2Y 4A2
| | - Pavel Kratina
- School of Biological and Chemical Sciences, Queen Mary University of London, London E1 4NS, UK
| | - Colin Kremer
- W. K. Kellogg Biological Station and Department of Plant Biology, Michigan State University, Hickory Corners, MI 49060, USA Department of Plant Biology, Michigan State University, East Lansing, MI 48824, USA
| | - Claire de Mazancourt
- Centre for Biodiversity Theory and Modelling, Station d'Ecologie Expérimentale du Centre National de la Recherche Scientifique à Moulis, Moulis 09200, France
| | - Elizabeth Miller
- W. K. Kellogg Biological Station and Department of Plant Biology, Michigan State University, Hickory Corners, MI 49060, USA Department of Plant Biology, Michigan State University, East Lansing, MI 48824, USA
| | - William A Nelson
- Department of Biology, Queen's University, Kingston, Ontario, Canada K7L 3N6
| | - Michael Paterson
- IISD-Experimental Lakes Area, 161 Portage Ave East 6th Floor, Winnipeg, MB, Canada R3B 0Y4
| | - James A Rusak
- Ontario Ministry of the Environment, Dorset Environmental Science Centre, Dorset, Ontario, Canada P0A 1E0
| | - Jonathan B Shurin
- Section of Ecology, Behavior and Evolution, University of California-San Diego, 9500 Gilman Drive #0116, La Jolla, CA 92093, USA
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31
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Domis LNDS, Van de Waal DB, Helmsing NR, Van Donk E, Mooij WM. Community stoichiometry in a changing world: combined effects of warming and eutrophication on phytoplankton dynamics. Ecology 2014; 95:1485-95. [PMID: 25039214 DOI: 10.1890/13-1251.1] [Citation(s) in RCA: 80] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The current changes in our climate will likely have far-reaching consequences for aquatic ecosystems. These changes in the climate, however, do not act alone, and are often accompanied by additional stressors such as eutrophication. Both global warming and eutrophication have been shown to affect the timing and magnitude of phytoplankton blooms. Little is known about the combined effects of rising temperatures and eutrophication on the stoichiometry of entire phytoplankton communities. We exposed a natural phytoplankton spring community to different warming and phosphorus-loading scenarios using a full-factorial design. Our results demonstrate that rising temperatures promote the growth rate of an entire phytoplankton community. Furthermore, both rising temperatures and phosphorus loading stimulated the maximum biomass built up by the phytoplankton community. Rising temperatures led to higher carbon: nutrient stoichiometry of the phytoplankton community under phosphorus-limited conditions. Such a shift towards higher carbon: nutrient ratios, in combination with a higher biomass buildup, suggests a temperature-driven increase in nutrient use efficiency, the phytoplankton community. Importantly, with higher carbon: nutrient stoichiometry, phytoplankton is generally of poorer nutritional value for zooplankton. Thus, although warming may result in higher phytoplankton biomass, this may be accompanied by a stoichiometric mismatch between phytoplankton and their grazers, with possible consequences for the entire aquatic food web.
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32
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García-Mozo H, Yaezel L, Oteros J, Galán C. Statistical approach to the analysis of olive long-term pollen season trends in southern Spain. THE SCIENCE OF THE TOTAL ENVIRONMENT 2014; 473-474:103-9. [PMID: 24361781 DOI: 10.1016/j.scitotenv.2013.11.142] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2013] [Revised: 11/28/2013] [Accepted: 11/28/2013] [Indexed: 05/21/2023]
Abstract
Analysis of long-term airborne pollen counts makes it possible not only to chart pollen-season trends but also to track changing patterns in flowering phenology. Changes in higher plant response over a long interval are considered among the most valuable bioindicators of climate change impact. Phenological-trend models can also provide information regarding crop production and pollen-allergen emission. The interest of this information makes essential the election of the statistical analysis for time series study. We analysed trends and variations in the olive flowering season over a 30-year period (1982-2011) in southern Europe (Córdoba, Spain), focussing on: annual Pollen Index (PI); Pollen Season Start (PSS), Peak Date (PD), Pollen Season End (PSE) and Pollen Season Duration (PSD). Apart from the traditional Linear Regression analysis, a Seasonal-Trend Decomposition procedure based on Loess (STL) and an ARIMA model were performed. Linear regression results indicated a trend toward delayed PSE and earlier PSS and PD, probably influenced by the rise in temperature. These changes are provoking longer flowering periods in the study area. The use of the STL technique provided a clearer picture of phenological behaviour. Data decomposition on pollination dynamics enabled the trend toward an alternate bearing cycle to be distinguished from the influence of other stochastic fluctuations. Results pointed to show a rising trend in pollen production. With a view toward forecasting future phenological trends, ARIMA models were constructed to predict PSD, PSS and PI until 2016. Projections displayed a better goodness of fit than those derived from linear regression. Findings suggest that olive reproductive cycle is changing considerably over the last 30years due to climate change. Further conclusions are that STL improves the effectiveness of traditional linear regression in trend analysis, and ARIMA models can provide reliable trend projections for future years taking into account the internal fluctuations in time series.
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Affiliation(s)
- H García-Mozo
- Department of Botany, Ecology and Plant Physiology, Agrifood Campus of International Excellence (CeiA3), University of Córdoba, Córdoba, Spain.
| | - L Yaezel
- Smith College University, Northampton, MA, USA
| | - J Oteros
- Department of Botany, Ecology and Plant Physiology, Agrifood Campus of International Excellence (CeiA3), University of Córdoba, Córdoba, Spain
| | - C Galán
- Department of Botany, Ecology and Plant Physiology, Agrifood Campus of International Excellence (CeiA3), University of Córdoba, Córdoba, Spain
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33
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North RP, North RL, Livingstone DM, Köster O, Kipfer R. Long-term changes in hypoxia and soluble reactive phosphorus in the hypolimnion of a large temperate lake: consequences of a climate regime shift. GLOBAL CHANGE BIOLOGY 2014; 20:811-23. [PMID: 24038822 DOI: 10.1111/gcb.12371] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/12/2013] [Revised: 08/02/2013] [Accepted: 08/05/2013] [Indexed: 05/06/2023]
Abstract
The (Lower) Lake of Zurich provides an ideal system for studying the long-term impact of environmental change on deep-water hypoxia because of its sensitivity to climatic forcing, its history of eutrophication and subsequent oligotrophication, and the quality and length of its data set. Based on 39 years (1972-2010) of measured profiles of temperature, oxygen concentration and phosphorus (P) concentration, the potentially confounding effects of oligotrophication and climatic forcing on the occurrence and extent of deep-water hypoxia in the lake were investigated. The time-series of Nürnberg's hypoxic factor (HF) for the lake can be divided into three distinct segments: (i) a segment of consistently low HF from 1972 to the late-1980s climate regime shift (CRS); (ii) a transitional segment between the late-1980s CRS and approximately 2000 within which the HF was highly variable; and (iii) a segment of consistently high HF thereafter. The increase in hypoxia during the study period was not a consequence of a change in trophic status, as the lake underwent oligotrophication as a result of reduced external P loading during this time. Instead, wavelet analysis suggests that changes in the lake's mixing regime, initiated by the late-1980s CRS, ultimately led to a delayed but abrupt decrease in the deep-water oxygen concentration, resulting in a general expansion of the hypoxic zone in autumn. Even after detrending to remove long-term effects, the concentration of soluble reactive P in the bottom water of the lake was highly correlated with various measures of hypoxia, providing quantitative evidence supporting the probable effect of hypoxia on internal P loading. Such climate-induced, ecosystem-scale changes, which may result in undesirable effects such as a decline in water quality and a reduction in coldwater fish habitats, provide further evidence for the vulnerability of large temperate lakes to predicted increases in global air temperature.
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Affiliation(s)
- Ryan P North
- Department of Water Resources and Drinking Water, Eawag, Swiss Federal Institute of Aquatic Science and Technology, Überlandstrasse 133, CH-8600, Dübendorf, Switzerland; Department of Environmental Systems Science, Institute of Biogeochemistry and Pollution Dynamics, ETH Zurich, Universitätstrasse 16, CH-8092, Zürich, Switzerland
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34
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Pomati F, Kraft NJB, Posch T, Eugster B, Jokela J, Ibelings BW. Individual cell based traits obtained by scanning flow-cytometry show selection by biotic and abiotic environmental factors during a phytoplankton spring bloom. PLoS One 2013; 8:e71677. [PMID: 23951218 PMCID: PMC3741118 DOI: 10.1371/journal.pone.0071677] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2013] [Accepted: 07/02/2013] [Indexed: 11/18/2022] Open
Abstract
In ecology and evolution, the primary challenge in understanding the processes that shape biodiversity is to assess the relationship between the phenotypic traits of organisms and the environment. Here we tested for selection on physio-morphological traits measured by scanning flow-cytometry at the individual level in phytoplankton communities under a temporally changing biotic and abiotic environment. Our aim was to study how high-frequency temporal changes in the environment influence biodiversity dynamics in a natural community. We focused on a spring bloom in Lake Zurich (Switzerland), characterized by rapid changes in phytoplankton, water conditions, nutrients and grazing (mainly mediated by herbivore ciliates). We described bloom dynamics in terms of taxonomic and trait-based diversity and found that diversity dynamics of trait-based groups were more pronounced than those of identified phytoplankton taxa. We characterized the linkage between measured phytoplankton traits, abiotic environmental factors and abundance of the main grazers and observed weak but significant correlations between changing abiotic and biotic conditions and measured size-related and fluorescence-related traits. We tested for deviations in observed community-wide distributions of focal traits from random patterns and found evidence for both clustering and even spacing of traits, occurring sporadically over the time series. Patterns were consistent with environmental filtering and phenotypic divergence under herbivore pressure, respectively. Size-related traits showed significant even spacing during the peak of herbivore abundance, suggesting that morphology-related traits were under selection from grazing. Pigment distribution within cells and colonies appeared instead to be associated with acclimation to temperature and water chemistry. We found support for trade-offs among grazing resistance and environmental tolerance traits, as well as for substantial periods of dynamics in which our measured traits were not under selection.
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Affiliation(s)
- Francesco Pomati
- Department of Aquatic Ecology, Swiss Federal Institute of Aquatic Science and Technology (Eawag), Dübendorf, Switzerland.
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35
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Vittoz P, Cherix D, Gonseth Y, Lubini V, Maggini R, Zbinden N, Zumbach S. Climate change impacts on biodiversity in Switzerland: A review. J Nat Conserv 2013. [DOI: 10.1016/j.jnc.2012.12.002] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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36
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Matthews B, Pomati F. Reversal in the relationship between species richness and turnover in a phytoplankton community. Ecology 2013; 93:2435-47. [PMID: 23236914 DOI: 10.1890/11-2289.1] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Negative relationships between species richness and the rate of compositional turnover are common, suggesting that diverse communities have greater stability than depauperate ones; however, the mechanistic basis for this pattern is still widely debated. Species richness and turnover can covary either because they are mechanistically linked or because they share common environmental drivers. Few empirical studies have combined long-term changes in community composition with multiple drivers of environmental change, and so little is known about how the underlying mechanisms of species coexistence interact with changes in the mean and variability of environmental conditions. Here, we use a 33 year long time series (1976-2008) of phytoplankton community composition from Lake Zurich, to examine how environmental variation influences the relationship between richness and annual turnover. We find that the relationship between richness and annual turnover reverses midway through the time series (1992-1993), leading to a hump-shaped relationship between species richness and annual turnover. Using structural equation modeling we show that annual turnover and diversity are independently associated with different drivers of environmental change. Furthermore, we find that the observed annual sequences of community assembly give rise to rates of species accumulation that are more heterogeneous through time than expected by chance, likely owing to a high proportion of species showing significant autocorrelation and to strong positive covariation in the occurrences of species.
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Affiliation(s)
- Blake Matthews
- EAWAG, Aquatic Ecology Department, Center for Ecology, Evolution, and Biogeochemistry, Lucerne, Switzerland.
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