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Slate ML, Antoninka A, Bailey L, Berdugo MB, Callaghan DA, Cárdenas M, Chmielewski MW, Fenton NJ, Holland-Moritz H, Hopkins S, Jean M, Kraichak BE, Lindo Z, Merced A, Oke T, Stanton D, Stuart J, Tucker D, Coe KK. Impact of changing climate on bryophyte contributions to terrestrial water, carbon, and nitrogen cycles. THE NEW PHYTOLOGIST 2024; 242:2411-2429. [PMID: 38659154 DOI: 10.1111/nph.19772] [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: 12/20/2023] [Accepted: 03/22/2024] [Indexed: 04/26/2024]
Abstract
Bryophytes, including the lineages of mosses, liverworts, and hornworts, are the second-largest photoautotroph group on Earth. Recent work across terrestrial ecosystems has highlighted how bryophytes retain and control water, fix substantial amounts of carbon (C), and contribute to nitrogen (N) cycles in forests (boreal, temperate, and tropical), tundra, peatlands, grasslands, and deserts. Understanding how changing climate affects bryophyte contributions to global cycles in different ecosystems is of primary importance. However, because of their small physical size, bryophytes have been largely ignored in research on water, C, and N cycles at global scales. Here, we review the literature on how bryophytes influence global biogeochemical cycles, and we highlight that while some aspects of global change represent critical tipping points for survival, bryophytes may also buffer many ecosystems from change due to their capacity for water, C, and N uptake and storage. However, as the thresholds of resistance of bryophytes to temperature and precipitation regime changes are mostly unknown, it is challenging to predict how long this buffering capacity will remain functional. Furthermore, as ecosystems shift their global distribution in response to changing climate, the size of different bryophyte-influenced biomes will change, resulting in shifts in the magnitude of bryophyte impacts on global ecosystem functions.
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Affiliation(s)
- Mandy L Slate
- Department of Evolution, Ecology & Organismal Biology, The Ohio State University, Columbus, OH, 43210, USA
| | - Anita Antoninka
- School of Forestry, Northern Arizona University, Flagstaff, AZ, 86005, USA
| | - Lydia Bailey
- School of Forestry, Northern Arizona University, Flagstaff, AZ, 86005, USA
| | - Monica B Berdugo
- Plant Ecology and Geobotany, Department of Biology, University of Marburg, Karl-von-Frisch Str. 8, 35043, Marburg, Germany
| | - Des A Callaghan
- Bryophyte Surveys Ltd, Almondsbury, South Gloucestershire, BS32 4DU, UK
| | - Mariana Cárdenas
- Department of Ecology Evolution and Behavior, University of Minnesota, Saint Paul, MN, 55108, USA
| | | | - Nicole J Fenton
- Université du Québec en Abitibi-Témiscamingue, Rouyn-Noranda, QC, J9X 5E4, Canada
| | - Hannah Holland-Moritz
- Department of Natural Resources and the Environment, University of New Hampshire, Durham, NH, 03824, USA
| | - Samantha Hopkins
- Department of Biology, University of Western Ontario, London, ON, N6A 3K7, Canada
| | - Mélanie Jean
- Université de Moncton, Moncton, NB, E1A 3E9, Canada
| | - Bier Ekaphan Kraichak
- Department of Botany, Faculty of Science, Kasetsart University in Bangkok, Bangkok, 10900, Thailand
| | - Zoë Lindo
- Department of Biology, University of Western Ontario, London, ON, N6A 3K7, Canada
| | - Amelia Merced
- Department of Biology, University of Puerto Rico Río Piedras, San Juan, PR, 00925, USA
| | - Tobi Oke
- Wildlife Conservation Society & School of Environment & Sustainability, University of Saskatchewan, Saskatoon, SK, S7N 5C8, Canada
| | - Daniel Stanton
- Department of Ecology Evolution and Behavior, University of Minnesota, Saint Paul, MN, 55108, USA
| | - Julia Stuart
- College of Forest Resources and Environmental Science, Michigan Technological University, Houghton, MI, 49931, USA
- Mountain Planning Service Group, US Forest Service, Lakewood, CO, 80401, USA
| | - Daniel Tucker
- School of Environmental Studies, University of Victoria, Victoria, BC, V8P 5C2, Canada
| | - Kirsten K Coe
- Department of Biology, Middlebury College, Middlebury, VT, 05753, USA
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Grau-Andrés R, Thieffry S, Tian S, Wardle DA, Kardol P. Responses of bryosphere fauna to drought across a boreal forest chronosequence. Oecologia 2022; 200:231-245. [PMID: 36074302 PMCID: PMC9547781 DOI: 10.1007/s00442-022-05255-z] [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: 04/21/2022] [Accepted: 08/31/2022] [Indexed: 11/29/2022]
Abstract
Projected changes in precipitation regimes can greatly impact soil biota, which in turn alters key ecosystem functions. In moss-dominated ecosystems, the bryosphere (i.e., the ground moss layer including live and senesced moss) plays a key role in carbon and nutrient cycling, and it hosts high abundances of microfauna (i.e., nematodes and tardigrades) and mesofauna (i.e., mites and springtails). However, we know very little about how bryosphere fauna responds to precipitation, and whether this response changes across environmental gradients. Here, we used a mesocosm experiment to study the effect of volume and frequency of precipitation on the abundance and community composition of functional groups of bryosphere fauna. Hylocomium splendens bryospheres were sampled from a long-term post-fire boreal forest chronosequence in northern Sweden which varies greatly in environmental conditions. We found that reduced precipitation promoted the abundance of total microfauna and of total mesofauna, but impaired predaceous/omnivorous nematodes, and springtails. Generally, bryosphere fauna responded more strongly to precipitation volume than to precipitation frequency. For some faunal functional groups, the effects of precipitation frequency were stronger at reduced precipitation volumes. Context-dependency effects were found for microfauna only: microfauna was more sensitive to precipitation in late-successional forests (i.e., those with lower productivity and soil nutrient availability) than in earlier-successional forests. Our results also suggest that drought-induced changes in trophic interactions and food resources in the bryosphere may increase faunal abundance. Consequently, drier bryospheres that may result from climate change could promote carbon and nutrient turnover from fauna activity, especially in older, less productive forests.
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Affiliation(s)
- Roger Grau-Andrés
- Department of Forest Ecology and Management, Swedish University of Agricultural Sciences (SLU), Umeå, Sweden
| | - Sylvia Thieffry
- Department of Forest Ecology and Management, Swedish University of Agricultural Sciences (SLU), Umeå, Sweden
| | - Shanyi Tian
- Department of Forest Ecology and Management, Swedish University of Agricultural Sciences (SLU), Umeå, Sweden
- Soil Ecology Lab, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, 210095 China
| | - David A. Wardle
- Asian School of the Environment, Nanyang Technological University, Singapore, Singapore
| | - Paul Kardol
- Department of Forest Ecology and Management, Swedish University of Agricultural Sciences (SLU), Umeå, Sweden
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Grau-Andrés R, Wardle DA, Kardol P. Bryosphere Loss Impairs Litter Decomposition Consistently Across Moss Species, Litter Types, and Micro-Arthropod Abundance. Ecosystems 2021. [DOI: 10.1007/s10021-021-00731-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
AbstractThe bryosphere (that is, ground mosses and their associated biota) is a key driver of nutrient and carbon dynamics in many terrestrial ecosystems, in part because it regulates litter decomposition. However, we have a poor understanding of how litter decomposition responds to changes in the bryosphere, including changes in bryosphere cover, moss species, and bryosphere-associated biota. Specifically, the contribution of micro-arthropods to litter decomposition in the bryosphere is unclear. Here, we used a 16-month litterbag field experiment in two boreal forests to investigate bryosphere effects on litter decomposition rates among two moss species (Pleurozium schreberi and Hylocomium splendens), and two litter types (higher-quality Betula pendula litter and lower-quality P. schreberi litter). Additionally, we counted all micro-arthropods in the litterbags and identified them to functional groups. We found that bryosphere removal reduced litter decomposition rates by 28% and micro-arthropod abundance by 29% and led to a colder micro-climate. Litter decomposition rates and micro-arthropod abundance were uncorrelated overall, but were positively correlated in B. pendula litterbags. Bryosphere effects on litter decomposition rates were consistent across moss species, litter types, and micro-arthropod abundances and community compositions. These findings suggest that micro-arthropods play a minor role in litter decomposition in the boreal forest floor, suggesting that other factors (for example, micro-climate, nutrient availability) likely drive the positive effect of the bryosphere on decomposition rates. Our results point to a substantial and consistent impairment of litter decomposition in response to loss of moss cover, which could have important implications for nutrient and carbon cycling in moss-dominated ecosystems.
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Grau‐Andrés R, Wardle DA, Nilsson M, Kardol P. Precipitation regime controls bryosphere carbon cycling similarly across contrasting ecosystems. OIKOS 2021. [DOI: 10.1111/oik.07749] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Roger Grau‐Andrés
- Dept of Forest Ecology and Management, Swedish Univ. of Agricultural Sciences (SLU) Umeå Sweden
| | - David A. Wardle
- Dept of Forest Ecology and Management, Swedish Univ. of Agricultural Sciences (SLU) Umeå Sweden
- Asian School of the Environment, Nanyang Technological Univ. Singapore Singapore
| | - Marie‐Charlotte Nilsson
- Dept of Forest Ecology and Management, Swedish Univ. of Agricultural Sciences (SLU) Umeå Sweden
| | - Paul Kardol
- Dept of Forest Ecology and Management, Swedish Univ. of Agricultural Sciences (SLU) Umeå Sweden
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Hyodo F, Takebayashi Y, Makabe A, Wardle DA, Koba K. Changes in stable nitrogen isotopes of plants, bulk soil and soil dissolved N during ecosystem retrogression in boreal forest. Ecol Res 2021. [DOI: 10.1111/1440-1703.12208] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Fujio Hyodo
- Research Core for Interdisciplinary Sciences Okayama University Tsushimanaka Okayama Japan
| | - Yu Takebayashi
- Faculty of Agriculture Tokyo University of Agriculture and Technology Tokyo Japan
| | - Akiko Makabe
- Faculty of Agriculture Tokyo University of Agriculture and Technology Tokyo Japan
- Institute for Extra‐Cutting‐Edge Science and Technology Avant‐Garde Research (X‐Star) Yokosuka Japan
| | | | - Keisuke Koba
- Faculty of Agriculture Tokyo University of Agriculture and Technology Tokyo Japan
- Center for Ecological Research Kyoto University Otsu Shiga Japan
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Van Langenhove L, Depaepe T, Verryckt LT, Fuchslueger L, Donald J, Leroy C, Krishna Moorthy SM, Gargallo-Garriga A, Ellwood MDF, Verbeeck H, Van Der Straeten D, Peñuelas J, Janssens IA. Comparable canopy and soil free-living nitrogen fixation rates in a lowland tropical forest. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 754:142202. [PMID: 33254844 DOI: 10.1016/j.scitotenv.2020.142202] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/16/2020] [Revised: 09/01/2020] [Accepted: 09/02/2020] [Indexed: 06/12/2023]
Abstract
Biological nitrogen fixation (BNF) is a fundamental part of nitrogen cycling in tropical forests, yet little is known about the contribution made by free-living nitrogen fixers inhabiting the often-extensive forest canopy. We used the acetylene reduction assay, calibrated with 15N2, to measure free-living BNF on forest canopy leaves, vascular epiphytes, bryophytes and canopy soil, as well as on the forest floor in leaf litter and soil. We used a combination of calculated and published component densities to upscale free-living BNF rates to the forest level. We found that bryophytes and leaves situated in the canopy in particular displayed high mass-based rates of free-living BNF. Additionally, we calculated that nearly 2 kg of nitrogen enters the forest ecosystem through free-living BNF every year, 40% of which was fixed by the various canopy components. Our results reveal that in the studied tropical lowland forest a large part of the nitrogen input through free-living BNF stems from the canopy, but also that the total nitrogen inputs by free-living BNF are lower than previously thought and comparable to the inputs of reactive nitrogen by atmospheric deposition.
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Affiliation(s)
- Leandro Van Langenhove
- Research group Plants and Ecosystem (PLECO), Department of Biology, University of Antwerp, Wilrijk, Belgium.
| | - Thomas Depaepe
- Laboratory of Functional Plant Biology, Department of Biology, Ghent University, Ghent, Belgium
| | - Lore T Verryckt
- Research group Plants and Ecosystem (PLECO), Department of Biology, University of Antwerp, Wilrijk, Belgium
| | - Lucia Fuchslueger
- Research group Plants and Ecosystem (PLECO), Department of Biology, University of Antwerp, Wilrijk, Belgium; Division of Terrestrial Ecosystem Research, Centre for Microbiology and Environmental Systems Science, University of Vienna, Vienna, Austria
| | - Julian Donald
- CNRS, IRD, UMR 5174 Evolution et Diversité Biologique (EDB), Université Toulouse, 3 Paul Sabatier, Toulouse, France
| | - Celine Leroy
- AMAP, Univ Montpellier, CIRAD, CNRS, INRAE, IRD, Montpellier, France; UMR EcoFoG, CNRS, CIRAD, INRAE, AgroParisTech, Université des Antilles, Université de Guyane, 97310 Kourou, France
| | - Sruthi M Krishna Moorthy
- Computational and Applied Vegetation Ecology, Department of Environment, Ghent University, 9000 Ghent, Belgium
| | - Albert Gargallo-Garriga
- CSIC, Global Ecology Unit CREAF-CSIC-UAB, 08193 Bellaterra, Catalonia, Spain; CREAF, 08193 Cerdanyola del Vallès, Catalonia, Spain; Global Change Research Institute, The Czech Academy of Sciences, Belidla 986/4a, CZ-60300 Brno, Czech Republic
| | - M D Farnon Ellwood
- Centre for Research in Biosciences, University of the West of England, Coldharbour Lane, Bristol, BS16 1QY, UK
| | - Hans Verbeeck
- Computational and Applied Vegetation Ecology, Department of Environment, Ghent University, 9000 Ghent, Belgium
| | | | - Josep Peñuelas
- CSIC, Global Ecology Unit CREAF-CSIC-UAB, 08193 Bellaterra, Catalonia, Spain; CREAF, 08193 Cerdanyola del Vallès, Catalonia, Spain
| | - Ivan A Janssens
- Research group Plants and Ecosystem (PLECO), Department of Biology, University of Antwerp, Wilrijk, Belgium
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Markham J, Fernández Otárola M. Bryophyte and lichen biomass and nitrogen fixation in a high elevation cloud forest in Cerro de La Muerte, Costa Rica. Oecologia 2021; 195:489-497. [PMID: 33394128 DOI: 10.1007/s00442-020-04840-4] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2020] [Accepted: 12/17/2020] [Indexed: 12/01/2022]
Abstract
Cloud forests have been found to lose more nitrogen in stream discharge than they gain from atmospheric deposition. They also support a large diversity and biomass of tree epiphytes, predominately composed of cryptogams. Since cryptogam epiphytes harbor nitrogen fixing cyanobacteria, they may help make up for the nitrogen loss from ecosystems. We assessed cryptogam biomass on the ground, boles and branches in Quercus costaricensis dominated stands near the tree line in the Cordillera de Talamanca, Costa Rica. Nitrogen fixation was assayed using 15N2 uptake. Total cryptogam biomass was 2 977 kg ha-1, with 67% being found on the lower branches. Bryophytes and chlorolichens made up 53% and 44%, respectively, of the biomass. Half of the bryophyte mass was composed of the liverwort Plagiochila heterophylla, and 66% of the chlorolichen of Lobariella pallida. There were no significant differences in nitrogen fixation rates between the cryptogam species, with a mean rate of 5.04 µg N g-1 day-1 during the predominantly wet condition in the forest. The overall nitrogen input from fixation was 6.1 kg N ha-1 year-1, of which 78% came from bryophytes, 18% from chlorolichens, and 4% from cyanolichens. Only 2.0% of the fixation occurred in cryptogams on the ground, whereas 67%, 24%, and 7% occurred on the lower branches, boles, and upper branches, respectively. These results show that tree epiphytes constitute a significant source of nitrogen for these forests, due to the trees' large surface area, and can make up for the nitrogen lost from these ecosystems.
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Affiliation(s)
- John Markham
- Department of Biological Sciences, University of Manitoba, Winnipeg, MB, R3T 2N2, Canada.
| | - Mauricio Fernández Otárola
- Research Center for Biodiversity and Tropical Ecology (CIBET), and School of Biology, University of Costa Rica, San Pedro, San Jose, 11501-2060, Costa Rica
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Grau-Andrés R, Wardle DA, Gundale MJ, Foster CN, Kardol P. Effects of plant functional group removal on CO 2 fluxes and belowground C stocks across contrasting ecosystems. Ecology 2020; 101:e03170. [PMID: 32846007 PMCID: PMC7757239 DOI: 10.1002/ecy.3170] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/20/2020] [Accepted: 06/29/2020] [Indexed: 11/17/2022]
Abstract
Changes in plant communities can have large effects on ecosystem carbon (C) dynamics and long‐term C stocks. However, how these effects are mediated by environmental context or vary among ecosystems is not well understood. To study this, we used a long‐term plant removal experiment set up across 30 forested lake islands in northern Sweden that collectively represent a strong gradient of soil fertility and ecosystem productivity. We measured forest floor CO2 exchange and aboveground and belowground C stocks for a 22‐yr experiment involving factorial removal of the two dominant functional groups of the boreal forest understory, namely ericaceous dwarf shrubs and feather mosses, on each of the 30 islands. We found that long‐term shrub and moss removal increased forest floor net CO2 loss and decreased belowground C stocks consistently across the islands irrespective of their productivity or soil fertility. However, we did see context‐dependent responses of respiration to shrub removals because removals only increased respiration on islands of intermediate productivity. Both CO2 exchange and C stocks responded more strongly to shrub removal than to moss removal. Shrub removal reduced gross primary productivity of the forest floor consistently across the island gradient, but it had no effect on respiration, which suggests that loss of belowground C caused by the removals was driven by reduced litter inputs. Across the island gradient, shrub removal consistently depleted C stocks in the soil organic horizon by 0.8 kg C/m2. Our results show that the effect of plant functional group diversity on C dynamics can be relatively consistent across contrasting ecosystems that vary greatly in productivity and soil fertility. These findings underline the key role of understory vegetation in forest C cycling, and suggest that global change leading to changes in the relative abundance of both shrubs and mosses could impact on the capacity of boreal forests to store C.
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Affiliation(s)
- Roger Grau-Andrés
- Department of Forest Ecology and Management, Swedish University of Agricultural Sciences (SLU), Umeå, Sweden
| | - David A Wardle
- Department of Forest Ecology and Management, Swedish University of Agricultural Sciences (SLU), Umeå, Sweden.,Asian School of the Environment, Nanyang Technological University, Singapore, Singapore
| | - Michael J Gundale
- Department of Forest Ecology and Management, Swedish University of Agricultural Sciences (SLU), Umeå, Sweden
| | - Claire N Foster
- Fenner School of Environment and Society, The Australian National University, Canberra, Australian Capital Territory, Australia
| | - Paul Kardol
- Department of Forest Ecology and Management, Swedish University of Agricultural Sciences (SLU), Umeå, Sweden
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Prather HM, Casanova-Katny A, Clements AF, Chmielewski MW, Balkan MA, Shortlidge EE, Rosenstiel TN, Eppley SM. Species-specific effects of passive warming in an Antarctic moss system. ROYAL SOCIETY OPEN SCIENCE 2019; 6:190744. [PMID: 31827828 PMCID: PMC6894601 DOI: 10.1098/rsos.190744] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/09/2019] [Accepted: 10/09/2019] [Indexed: 06/10/2023]
Abstract
Polar systems are experiencing rapid climate change and the high sensitivity of these Arctic and Antarctic ecosystems make them especially vulnerable to accelerated ecological transformation. In Antarctica, warming results in a mosaic of ice-free terrestrial habitats dominated by a diverse assemblage of cryptogamic plants (i.e. mosses and lichens). Although these plants provide key habitat for a wide array of microorganisms and invertebrates, we have little understanding of the interaction between trophic levels in this terrestrial ecosystem and whether there are functional effects of plant species on higher trophic levels that may alter with warming. Here, we used open top chambers on Fildes Peninsula, King George Island, Antarctica, to examine the effects of passive warming and moss species on the abiotic environment and ultimately on higher trophic levels. For the dominant mosses, Polytrichastrum alpinum and Sanionia georgicouncinata, we found species-specific effects on the abiotic environment, including moss canopy temperature and soil moisture. In addition, we found distinct shifts in sexual expression in P. alpinum plants under warming compared to mosses without warming, and invertebrate communities in this moss species were strongly correlated with plant reproduction. Mosses under warming had substantially larger total invertebrate communities, and some invertebrate taxa were influenced differentially by moss species. However, warmed moss plants showed lower fungal biomass than control moss plants, and fungal biomass differed between moss species. Our results indicate that continued warming may impact the reproductive output of Antarctic moss species, potentially altering terrestrial ecosystems dynamics from the bottom up. Understanding these effects requires clarifying the foundational, mechanistic role that individual plant species play in mediating complex interactions in Antarctica's terrestrial food webs.
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Affiliation(s)
- Hannah M. Prather
- Center for Life in Extreme Environments and Department of Biology, Portland State University, 1719 SW 10th Avenue, SRTC Room 246, Portland, OR 97201, USA
| | - Angélica Casanova-Katny
- Laboratorio de Ecofisiologia Vegetal, Facultad de Recursos Naturales, Universidad Católica de Temuco, Rudecindo Ortega 03694, Temuco, Chile
| | - Andrew F. Clements
- Center for Life in Extreme Environments and Department of Biology, Portland State University, 1719 SW 10th Avenue, SRTC Room 246, Portland, OR 97201, USA
| | - Matthew W. Chmielewski
- Center for Life in Extreme Environments and Department of Biology, Portland State University, 1719 SW 10th Avenue, SRTC Room 246, Portland, OR 97201, USA
| | - Mehmet A. Balkan
- Center for Life in Extreme Environments and Department of Biology, Portland State University, 1719 SW 10th Avenue, SRTC Room 246, Portland, OR 97201, USA
| | - Erin E. Shortlidge
- Center for Life in Extreme Environments and Department of Biology, Portland State University, 1719 SW 10th Avenue, SRTC Room 246, Portland, OR 97201, USA
| | - Todd N. Rosenstiel
- Center for Life in Extreme Environments and Department of Biology, Portland State University, 1719 SW 10th Avenue, SRTC Room 246, Portland, OR 97201, USA
| | - Sarah M. Eppley
- Center for Life in Extreme Environments and Department of Biology, Portland State University, 1719 SW 10th Avenue, SRTC Room 246, Portland, OR 97201, USA
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Lathifah AN, Guo Y, Sakagami N, Suda W, Higuchi M, Nishizawa T, Prijambada ID, Ohta H. Comparative Characterization of Bacterial Communities in Moss-Covered and Unvegetated Volcanic Deposits of Mount Merapi, Indonesia. Microbes Environ 2019; 34:268-277. [PMID: 31327812 PMCID: PMC6759343 DOI: 10.1264/jsme2.me19041] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2019] [Accepted: 05/15/2019] [Indexed: 01/30/2023] Open
Abstract
Microbial colonization, followed by succession, on newly exposed volcanic substrates represents the beginning of the development of an early ecosystem. During early succession, colonization by mosses or plants significantly alters the pioneer microbial community composition through the photosynthetic carbon input. To provide further insights into this process, we investigated the three-year-old volcanic deposits of Mount Merapi, Indonesia. Samples were collected from unvegetated (BRD) and moss-covered (BRUD) sites. Forest site soil (FRS) near the volcanic deposit-covered area was also collected for reference. An analysis of BRD and BRUD revealed high culturable cell densities (1.7-8.5×105 CFU g-1) despite their low total C (<0.01%). FRS possessed high CFU (3×106 g-1); however, its relative value per unit of total C (2.6%) was lower than that of the deposit samples. Based on the tag pyrosequencing of 16S rRNA genes, the BRD bacterial community was characterized by a higher number of betaproteobacterial families (or genus), represented by chemolithotrophic Methylophilaceae, Leptothrix, and Sulfuricellaceae. In contrast, BRUD was predominated by different betaproteobacterial families, such as Oxalobacteraceae, Comamonadaceae, and Rhodocyclaceae. Some bacterial (Oxalobacteraceae) sequences were phylogenetically related to those of known moss-associated bacteria. Within the FRS community, Proteobacteria was the most abundant phylum, followed by Acidobacteria, whereas Burkholderiaceae was the most dominant bacterial family within FRS. These results suggest that an inter-family succession of Betaproteobacteria occurred in response to colonization by mosses, followed by plants.
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Affiliation(s)
- Annisa N. Lathifah
- United Graduate School of Agricultural Science, Tokyo University of Agriculture and Technology3–5–8 Saiwai-cho, Fuchu-shi, Tokyo 183–8509Japan
- Ibaraki University College of Agriculture3–21–1 Chuo, Ami-machi, Ibaraki 300–0393Japan
| | - Yong Guo
- Ibaraki University College of Agriculture3–21–1 Chuo, Ami-machi, Ibaraki 300–0393Japan
| | - Nobuo Sakagami
- United Graduate School of Agricultural Science, Tokyo University of Agriculture and Technology3–5–8 Saiwai-cho, Fuchu-shi, Tokyo 183–8509Japan
- Ibaraki University College of Agriculture3–21–1 Chuo, Ami-machi, Ibaraki 300–0393Japan
| | - Wataru Suda
- Department of Computational Biology, Graduate School of Frontier Science, The University of TokyoKashiwaJapan
| | - Masanobu Higuchi
- Department of Botany, National Museum of Nature and Science4–1–1, Amakubo, IbarakiJapan
| | - Tomoyasu Nishizawa
- United Graduate School of Agricultural Science, Tokyo University of Agriculture and Technology3–5–8 Saiwai-cho, Fuchu-shi, Tokyo 183–8509Japan
- Ibaraki University College of Agriculture3–21–1 Chuo, Ami-machi, Ibaraki 300–0393Japan
| | - Irfan D. Prijambada
- Graduate School of Biotechnology, University of Gadjah MadaYogyakartaIndonesia
| | - Hiroyuki Ohta
- United Graduate School of Agricultural Science, Tokyo University of Agriculture and Technology3–5–8 Saiwai-cho, Fuchu-shi, Tokyo 183–8509Japan
- Ibaraki University College of Agriculture3–21–1 Chuo, Ami-machi, Ibaraki 300–0393Japan
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Fanin N, Kardol P, Farrell M, Kempel A, Ciobanu M, Nilsson MC, Gundale MJ, Wardle DA. Effects of plant functional group removal on structure and function of soil communities across contrasting ecosystems. Ecol Lett 2019; 22:1095-1103. [PMID: 30957419 DOI: 10.1111/ele.13266] [Citation(s) in RCA: 41] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2018] [Revised: 01/10/2019] [Accepted: 03/15/2019] [Indexed: 01/09/2023]
Abstract
Loss of plant diversity has an impact on ecosystems worldwide, but we lack a mechanistic understanding of how this loss may influence below-ground biota and ecosystem functions across contrasting ecosystems in the long term. We used the longest running biodiversity manipulation experiment across contrasting ecosystems in existence to explore the below-ground consequences of 19 years of plant functional group removals for each of 30 contrasting forested lake islands in northern Sweden. We found that, against expectations, the effects of plant removals on the communities of key groups of soil organisms (bacteria, fungi and nematodes), and organic matter quality and soil ecosystem functioning (decomposition and microbial activity) were relatively similar among islands that varied greatly in productivity and soil fertility. This highlights that, in contrast to what has been shown for plant productivity, plant biodiversity loss effects on below-ground functions can be relatively insensitive to environmental context or variation among widely contrasting ecosystems.
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Affiliation(s)
- Nicolas Fanin
- Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, 901-83, Umeå, Sweden.,INRA, UMR 1391 ISPA, Bordeaux Sciences Agro, 71 avenue Edouard Bourlaux, CS, 20032, F33882, Villenave-d'Ornon cedex, France
| | - Paul Kardol
- Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, 901-83, Umeå, Sweden
| | - Mark Farrell
- CSIRO Agriculture & Food, Locked bag 2, Glen Osmond, SA, 5064, Australia
| | - Anne Kempel
- Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, 901-83, Umeå, Sweden.,University of Bern, Institute of Plant Sciences, Altenbergrain 21, 3013, Bern, Switzerland
| | - Marcel Ciobanu
- Institute of Biological Research, Branch of the National Institute of Research and Development for Biological Sciences, Str. Republicii 48, Cluj-Napoca, Romania
| | - Marie-Charlotte Nilsson
- Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, 901-83, Umeå, Sweden
| | - Michael J Gundale
- Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, 901-83, Umeå, Sweden
| | - David A Wardle
- Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, 901-83, Umeå, Sweden.,Asian School of the Environment, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798
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12
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Fanin N, Gundale MJ, Farrell M, Ciobanu M, Baldock JA, Nilsson MC, Kardol P, Wardle DA. Consistent effects of biodiversity loss on multifunctionality across contrasting ecosystems. Nat Ecol Evol 2017; 2:269-278. [PMID: 29255299 DOI: 10.1038/s41559-017-0415-0] [Citation(s) in RCA: 82] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2017] [Accepted: 11/15/2017] [Indexed: 01/07/2023]
Abstract
Understanding how loss of biodiversity affects ecosystem functioning, and thus the delivery of ecosystem goods and services, has become increasingly necessary in a changing world. Considerable recent attention has focused on predicting how biodiversity loss simultaneously impacts multiple ecosystem functions (that is, ecosystem multifunctionality), but the ways in which these effects vary across ecosystems remain unclear. Here, we report the results of two 19-year plant diversity manipulation experiments, each established across a strong environmental gradient. Although the effects of plant and associated fungal diversity loss on individual functions frequently differed among ecosystems, the consequences of biodiversity loss for multifunctionality were relatively invariant. However, the context-dependency of biodiversity effects also worked in opposing directions for different individual functions, meaning that similar multifunctionality values across contrasting ecosystems could potentially mask important differences in the effects of biodiversity on functioning among ecosystems. Our findings highlight that an understanding of the relative contribution of species or functional groups to individual ecosystem functions among contrasting ecosystems and their interactions (that is, complementarity versus competition) is critical for guiding management efforts aimed at maintaining ecosystem multifunctionality and the delivery of multiple ecosystem services.
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Affiliation(s)
- Nicolas Fanin
- Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, Umeå, Sweden. .,Institut National de la Recherche Agronomique, UMR 1391 Interaction Soil Plant Atmosphere, Bordeaux Sciences Agro, 71 Avenue Edouard Bourlaux, Villenave-d'Ornon, France.
| | - Michael J Gundale
- Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, Umeå, Sweden
| | - Mark Farrell
- CSIRO Agriculture and Food, Locked Bag 2, Glen Osmond, South Australia, Australia
| | - Marcel Ciobanu
- Institute of Biological Research, Republicii Street 48, Cluj-Napoca, Romania
| | - Jeff A Baldock
- CSIRO Agriculture and Food, Locked Bag 2, Glen Osmond, South Australia, Australia
| | - Marie-Charlotte Nilsson
- Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, Umeå, Sweden
| | - Paul Kardol
- Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, Umeå, Sweden
| | - David A Wardle
- Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, Umeå, Sweden.,Asian School of the Environment, Nanyang Technological University, 50 Nanyang Avenue, Singapore
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13
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Palviainen M, Pumpanen J, Berninger F, Ritala K, Duan B, Heinonsalo J, Sun H, Köster E, Köster K. Nitrogen balance along a northern boreal forest fire chronosequence. PLoS One 2017; 12:e0174720. [PMID: 28358884 PMCID: PMC5373610 DOI: 10.1371/journal.pone.0174720] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2016] [Accepted: 03/14/2017] [Indexed: 12/02/2022] Open
Abstract
Fire is a major natural disturbance factor in boreal forests, and the frequency of forest fires is predicted to increase due to climate change. Nitrogen (N) is a key determinant of carbon sequestration in boreal forests because the shortage of N limits tree growth. We studied changes in N pools and fluxes, and the overall N balance across a 155-year non stand-replacing fire chronosequence in sub-arctic Pinus sylvestris forests in Finland. Two years after the fire, total ecosystem N pool was 622 kg ha-1 of which 16% was in the vegetation, 8% in the dead biomass and 76% in the soil. 155 years after the fire, total N pool was 960 kg ha-1, with 27% in the vegetation, 3% in the dead biomass and 69% in the soil. This implies an annual accumulation rate of 2.28 kg ha-1 which was distributed equally between soil and biomass. The observed changes in N pools were consistent with the computed N balance +2.11 kg ha-1 yr-1 over the 155-year post-fire period. Nitrogen deposition was an important component of the N balance. The biological N fixation increased with succession and constituted 9% of the total N input during the 155 post-fire years. N2O fluxes were negligible (≤ 0.01 kg ha-1 yr-1) and did not differ among post-fire age classes. The number and intensity of microbial genes involved in N cycling were lower at the site 60 years after fire compared to the youngest and the oldest sites indicating potential differences in soil N cycling processes. The results suggest that in sub-arctic pine forests, the non-stand-replacing, intermediate-severity fires decrease considerably N pools in biomass but changes in soil and total ecosystem N pools are slight. Current fire-return interval does not seem to pose a great threat to ecosystem productivity and N status in these sub-arctic forests.
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Affiliation(s)
- Marjo Palviainen
- Department of Forest Sciences, University of Helsinki, Helsinki, Finland
| | - Jukka Pumpanen
- Department of Environmental and Biological Sciences, University of Eastern Finland, Kuopio, Finland
| | - Frank Berninger
- Department of Forest Sciences, University of Helsinki, Helsinki, Finland
| | - Kaisa Ritala
- Department of Forest Sciences, University of Helsinki, Helsinki, Finland
| | - Baoli Duan
- Institute of Mountain Hazards and Environment, Chengdu, China
| | - Jussi Heinonsalo
- Department of Food and Environmental Sciences, University of Helsinki, Helsinki, Finland
| | - Hui Sun
- Department of Food and Environmental Sciences, University of Helsinki, Helsinki, Finland
- Collaborative Innovation Center of Sustainable Forestry in Southern China, College of Forestry, Nanjing Forestry University, Nanjing, China
| | - Egle Köster
- Department of Forest Sciences, University of Helsinki, Helsinki, Finland
| | - Kajar Köster
- Department of Forest Sciences, University of Helsinki, Helsinki, Finland
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14
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Cutler NA, Arróniz-Crespo M, Street LE, Jones DL, Chaput DL, DeLuca TH. Long-Term Recovery of Microbial Communities in the Boreal Bryosphere Following Fire Disturbance. MICROBIAL ECOLOGY 2017; 73:75-90. [PMID: 27538873 DOI: 10.1007/s00248-016-0832-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/13/2016] [Accepted: 08/05/2016] [Indexed: 06/06/2023]
Abstract
Our study used a ∼360-year fire chronosequence in northern Sweden to investigate post-fire microbial community dynamics in the boreal bryosphere (the living and dead parts of the feather moss layer on the forest floor, along with the associated biota). We anticipated systematic changes in microbial community structure and growth strategy with increasing time since fire (TSF) and used amplicon pyrosequencing to establish microbial community structure. We also recorded edaphic factors (relating to pH, C and N accumulation) and the physical characteristics of the feather moss layer. The molecular analyses revealed an unexpectedly diverse microbial community. The structure of the community could be largely explained by just two factors, TSF and pH, although the importance of TSF diminished as the forest recovered from disturbance. The microbial communities on the youngest site (TSF = 14 years) were clearly different from older locations (>100 years), suggesting relatively rapid post-fire recovery. A shift towards Proteobacterial taxa on older sites, coupled with a decline in the relative abundance of Acidobacteria, suggested an increase in resource availability with TSF. Saprotrophs dominated the fungal community. Mycorrhizal fungi appeared to decline in abundance with TSF, possibly due to changing N status. Our study provided evidence for the decadal-scale legacy of burning, with implications for boreal forests that are expected to experience more frequent burns over the course of the next century.
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Affiliation(s)
- Nick A Cutler
- Scott Polar Research Institute, Lensfield Road, Cambridge, CB2 1EP, UK.
- Churchill College, Cambridge, CB3 0DS, UK.
| | - María Arróniz-Crespo
- School of Environment, Natural Resources and Geography, Bangor University, Bangor, Gwynedd, LL57 2UW, UK
| | - Lorna E Street
- Terrestrial Environmental Sciences, Heriot-Watt University, Edinburgh, EH14 4AS, UK
| | - David L Jones
- School of Environment, Natural Resources and Geography, Bangor University, Bangor, Gwynedd, LL57 2UW, UK
| | - Dominique L Chaput
- Department of Mineral Sciences, National Museum of Natural History, Smithsonian Institution, 10th & Constitution NW, Washington, DC, 20560-119, USA
| | - Thomas H DeLuca
- School of Environment and Forest Science, University of Washington, Seattle, WA, 98195, USA
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15
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Cojoc EI, Postolache C, Olariu B, Beierkuhnlein C. Effects of anthropogenic fragmentation on primary productivity and soil carbon storage in temperate mountain grasslands. ENVIRONMENTAL MONITORING AND ASSESSMENT 2016; 188:653. [PMID: 27822788 DOI: 10.1007/s10661-016-5667-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/02/2016] [Accepted: 10/31/2016] [Indexed: 06/06/2023]
Abstract
Habitat fragmentation is one of the most severe anthropogenic pressures exerted on ecosystem's biodiversity. Empirical studies to date focused with an overriding interest on the effects of habitat loss or habitat fragmentation per se on species richness patterns detrimental to biogeochemical processes. To account for changes in ecosystem fluxes, we investigated how anthropogenic fragmentation affects primary productivity and carbon storage in temperate mountain grasslands. A field study was conducted to assess the influence of grassland isolation on soil carbon stocks, N availability, species biomass, and plant functional groups distribution. We tested the hypothesis that increased isolation of grassland, within the land cover, decreases soil carbon stocks, and available N nutrient as well as aboveground biomass. Soil carbon concentration decreased with isolation but increased near the forest edge. We found significant differences in aboveground biomass distribution and relative contribution of plant functional groups between isolation conditions. The magnitude of edge effect on carbon stocks, N availability, and primary productivity intensified with increasing isolation as a consequence of the additive influence of edges. Our study reveals that the potential creation of artificially isolated patches diminished primary productivity, N availability, and C stocks. However, in highly managed landscapes, grazing pressure is an additional factor that changes biomass and nutrients patterns. We emphasize that spatial configuration of the landscape has a major role in modulating ecological flows and ecosystem service supply, in addition to changes in species richness.
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Affiliation(s)
- Emilia Ionela Cojoc
- Department of Systems Ecology and Sustainable Development, University of Bucharest, Splaiul Independentei 91-95, 050095, Bucharest, Romania.
| | - Carmen Postolache
- Department of Systems Ecology and Sustainable Development, University of Bucharest, Splaiul Independentei 91-95, 050095, Bucharest, Romania
| | - Bogdan Olariu
- Department of Geography, University of Bucharest, Bucharest, Romania
| | - Carl Beierkuhnlein
- Department of Biogeography, BayCEER, University of Bayreuth, Bayreuth, Germany
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16
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Warshan D, Bay G, Nahar N, Wardle DA, Nilsson MC, Rasmussen U. Seasonal variation in nifH abundance and expression of cyanobacterial communities associated with boreal feather mosses. THE ISME JOURNAL 2016; 10:2198-208. [PMID: 26918665 PMCID: PMC4989308 DOI: 10.1038/ismej.2016.17] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/19/2015] [Revised: 12/16/2015] [Accepted: 01/08/2016] [Indexed: 11/13/2022]
Abstract
Dinitrogen (N2)-fixation by cyanobacteria living in symbiosis with pleurocarpous feather mosses (for example, Pleurozium schreberi and Hylocomium splendens) represents the main pathway of biological N input into N-depleted boreal forests. Little is known about the role of the cyanobacterial community in contributing to the observed temporal variability of N2-fixation. Using specific nifH primers targeting four major cyanobacterial clusters and quantitative PCR, we investigated how community composition, abundance and nifH expression varied by moss species and over the growing seasons. We evaluated N2-fixation rates across nine forest sites in June and September and explored the abundance and nifH expression of individual cyanobacterial clusters when N2-fixation is highest. Our results showed temporal and host-dependent variations of cyanobacterial community composition, nifH gene abundance and expression. N2-fixation was higher in September than June for both moss species, explained by higher nifH gene expression of individual clusters rather than higher nifH gene abundance or differences in cyanobacterial community composition. In most cases, 'Stigonema cluster' made up less than 29% of the total cyanobacterial community, but accounted for the majority of nifH gene expression (82-94% of total nifH expression), irrespective of sampling date or moss species. Stepwise multiple regressions showed temporal variations in N2-fixation being greatly explained by variations in nifH expression of the 'Stigonema cluster'. These results suggest that Stigonema is potentially the most influential N2-fixer in symbiosis with boreal forest feather mosses.
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Affiliation(s)
- Denis Warshan
- Department of Ecology, Environment and Plant Sciences, Stockholm University, Stockholm, Sweden
| | - Guillaume Bay
- Department of Ecology, Environment and Plant Sciences, Stockholm University, Stockholm, Sweden
- Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, Umeå, Sweden
| | - Nurun Nahar
- Department of Ecology, Environment and Plant Sciences, Stockholm University, Stockholm, Sweden
| | - David A Wardle
- Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, Umeå, Sweden
| | - Marie-Charlotte Nilsson
- Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, Umeå, Sweden
| | - Ulla Rasmussen
- Department of Ecology, Environment and Plant Sciences, Stockholm University, Stockholm, Sweden
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17
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Kardol P, Spitzer CM, Gundale MJ, Nilsson MC, Wardle DA. Trophic cascades in the bryosphere: the impact of global change factors on top-down control of cyanobacterial N2-fixation. Ecol Lett 2016; 19:967-76. [DOI: 10.1111/ele.12635] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2016] [Revised: 05/04/2016] [Accepted: 05/17/2016] [Indexed: 11/26/2022]
Affiliation(s)
- Paul Kardol
- Department of Forest Ecology and Management; Swedish University of Agricultural Sciences; 901 83 Umeå Sweden
| | - Clydecia M. Spitzer
- Department of Forest Ecology and Management; Swedish University of Agricultural Sciences; 901 83 Umeå Sweden
| | - Michael J. Gundale
- Department of Forest Ecology and Management; Swedish University of Agricultural Sciences; 901 83 Umeå Sweden
| | - Marie-Charlotte Nilsson
- Department of Forest Ecology and Management; Swedish University of Agricultural Sciences; 901 83 Umeå Sweden
| | - David A. Wardle
- Department of Forest Ecology and Management; Swedish University of Agricultural Sciences; 901 83 Umeå Sweden
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18
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Metcalfe DB, Crutsinger GM, Kumordzi BB, Wardle DA. Nutrient fluxes from insect herbivory increase during ecosystem retrogression in boreal forest. Ecology 2016; 97:124-32. [PMID: 27008782 DOI: 10.1890/15-0302.1] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Ecological theory, developed largely from ungulates and grassland systems, predicts that herbivory accelerates nutrient cycling more in productive than unproductive systems. This prediction may be important for understanding patterns of ecosystem change over time and space, but its applicability to other ecosystems and types of herbivore remain uncertain. We estimated fluxes of nitrogen (N) and phosphorus (P) from herbivory of a common tree species (Betula pubescens) by a common species of herbivorous insect along a -5000-yr boreal chronosequence. Contrary to established theory, fluxes of N and P via herbivory increased along the chronosequence despite a decline in plant productivity. The herbivore-mediated N and P fluxes to the soil are comparable to the main alternative pathway for these nutrients via tree leaf litterfall. We conclude that insect herbivores can make large contributions to nutrient cycling even in unproductive systems, and influence the rate and pattern of ecosystem development, particularly in systems with low external nutrient inputs.
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19
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Jonsson M, Kardol P, Gundale MJ, Bansal S, Nilsson MC, Metcalfe DB, Wardle DA. Direct and Indirect Drivers of Moss Community Structure, Function, and Associated Microfauna Across a Successional Gradient. Ecosystems 2014. [DOI: 10.1007/s10021-014-9819-8] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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20
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Wardle DA, Jonsson M. Long-term resilience of above- and belowground ecosystem components among contrasting ecosystems. Ecology 2014; 95:1836-49. [DOI: 10.1890/13-1666.1] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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21
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Lindo Z, Nilsson MC, Gundale MJ. Bryophyte-cyanobacteria associations as regulators of the northern latitude carbon balance in response to global change. GLOBAL CHANGE BIOLOGY 2013; 19:2022-35. [PMID: 23505142 DOI: 10.1111/gcb.12175] [Citation(s) in RCA: 84] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2012] [Revised: 01/17/2013] [Accepted: 01/23/2013] [Indexed: 05/03/2023]
Abstract
Ecosystems in the far north, including arctic and boreal biomes, are a globally significant pool of carbon (C). Global change is proposed to influence both C uptake and release in these ecosystems, thereby potentially affecting whether they act as C sources or sinks. Bryophytes (i.e., mosses) serve a variety of key functions in these systems, including their association with nitrogen (N2 )-fixing cyanobacteria, as thermal insulators of the soil, and producers of recalcitrant litter, which have implications for both net primary productivity (NPP) and heterotrophic respiration. While ground-cover bryophytes typically make up a small proportion of the total biomass in northern systems, their combined physical structure and N2 -fixing capabilities facilitate a disproportionally large impact on key processes that control ecosystem C and N cycles. As such, the response of bryophyte-cyanobacteria associations to global change may influence whether and how ecosystem C balances are influenced by global change. Here, we review what is known about their occurrence and N2 -fixing activity, and how bryophyte systems will respond to several key global change factors. We explore the implications these responses may have in determining how global change influences C balances in high northern latitudes.
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Affiliation(s)
- Zoë Lindo
- Department of Biology, Western University, London, ON, Canada.
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22
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Gundale MJ, Hyodo F, Nilsson MC, Wardle DA. Nitrogen niches revealed through species and functional group removal in a boreal shrub community. Ecology 2012; 93:1695-706. [DOI: 10.1890/11-1877.1] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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23
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Gundale MJ, Nilsson M, Bansal S, Jäderlund A. The interactive effects of temperature and light on biological nitrogen fixation in boreal forests. THE NEW PHYTOLOGIST 2012; 194:453-463. [PMID: 22329746 DOI: 10.1111/j.1469-8137.2012.04071.x] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Plant productivity is predicted to increase in northern latitudes as a result of climate warming; however, this may depend on whether biological nitrogen (N)-fixation also increases. We evaluated how the variation in temperature and light affects N-fixation by two boreal feather mosses, Pleurozium schreberi and Hylocomium splendens, which are the primary source of N-fixation in most boreal environments. We measured N-fixation rates 2 and 4 wk after exposure to a factorial combination of environments of normal, intermediate and high temperature (16.3, 22.0 and 30.3°C) and light (148.0, 295.7 and 517.3 μmol m(-2) s(-1)). Our results showed that P. schreberi achieved higher N-fixation rates relative to H. splendens in response to warming treatments, but that the highest warming treatment eventually caused N-fixation to decline for both species. Light strongly interacted with warming treatments, having positive effects at low or intermediate temperatures and damaging effects at high temperatures. These results suggest that climate warming may increase N-fixation in boreal forests, but that increased shading by the forest canopy or the occurrence of extreme temperature events could limit increases. They also suggest that P. schreberi may become a larger source of N in boreal forests relative to H. splendens as climate warming progresses.
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Affiliation(s)
- Michael J Gundale
- Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, SE901-83 Umeå, Sweden
| | - Madeleine Nilsson
- Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, SE901-83 Umeå, Sweden
| | - Sheel Bansal
- Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, SE901-83 Umeå, Sweden
| | - Anders Jäderlund
- Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, SE901-83 Umeå, Sweden
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24
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Response of photosynthetic carbon gain to ecosystem retrogression of vascular plants and mosses in the boreal forest. Oecologia 2012; 169:661-72. [PMID: 22228262 DOI: 10.1007/s00442-011-2246-z] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2011] [Accepted: 12/23/2011] [Indexed: 10/14/2022]
Abstract
In the long-term absence of rejuvenating disturbances, forest succession frequently proceeds from a maximal biomass phase to a retrogressive phase characterized by reduced nutrient availability [notably nitrogen (N) and phosphorus (P)] and net primary productivity. Few studies have considered how retrogression induces changes in ecophysiological responses associated with photosynthetic carbon (C) gain, and only for trees. We tested the hypothesis that retrogression would negatively impact photosynthetic C gain of four contrasting species, and that this impact would be greater for vascular plants (i.e., trees and shrubs) than for non-vascular plants (i.e., mosses). We used a 5,000-year-old chronosequence of forested islands in Sweden, where retrogression occurs in the long-term absence of lightning-ignited wildfires. Despite fundamental differences in plant form and ecological niche among species, vascular plants and mosses showed similar ecophysiological responses to retrogression. The most common effects of retrogression were reductions in photosynthesis and respiration per unit foliar N, increases in foliar N, δ(13)C and δ(15)N, and decreases in specific leaf areas. In contrast, photosynthesis per unit mass or area generally did not change along the chronosequence, but did vary many-fold between vascular plants and mosses. The consistent increases in foliar N without corresponding increases in mass- or area-based photosynthesis suggest that other factor(s), such as P co-limitation, light conditions or water availability, may co-regulate C gain in retrogressive boreal forests. Against our predictions, traits of mosses associated with C and N were generally highly responsive to retrogression, which has implications for how mosses influence ecosystem processes in boreal forests.
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25
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Ininbergs K, Bay G, Rasmussen U, Wardle DA, Nilsson MC. Composition and diversity of nifH genes of nitrogen-fixing cyanobacteria associated with boreal forest feather mosses. THE NEW PHYTOLOGIST 2011; 192:507-517. [PMID: 21714790 DOI: 10.1111/j.1469-8137.2011.03809.x] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Recent studies have revealed that nitrogen fixation by cyanobacteria living in association with feather mosses is a major input of nitrogen to boreal forests. We characterized the community composition and diversity of cyanobacterial nifH phylotypes associated with each of two feather moss species (Pleurozium schreberi and Hylocomium splendens) on each of 30 lake islands varying in ecosystem properties in northern Sweden. Nitrogen fixation was measured using acetylene reduction, and nifH sequences were amplified using general and cyanobacterial selective primers, separated and analyzed using density gradient gel electrophoresis (DGGE) or cloning, and further sequenced for phylogenetic analyses. Analyses of DGGE fingerprinting patterns revealed two host-specific clusters (one for each moss species), and sequence analysis showed five clusters of nifH phylotypes originating from heterocystous cyanobacteria. For H. splendens only, N(2) fixation was related to both nifH composition and diversity among islands. We demonstrated that the cyanobacterial communities associated with feather mosses show a high degree of host specificity. However, phylotype composition and diversity, and nitrogen fixation, did not differ among groups of islands that varied greatly in their availability of resources. These results suggest that moss species identity, but not extrinsic environmental conditions, serves as the primary determinant of nitrogen-fixing cyanobacterial communities that inhabit mosses.
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26
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Li Y, Wang Z, Xu T, Tu W, Liu C, Zhang Y, Yang C. Reorganization of photosystem II is involved in the rapid photosynthetic recovery of desert moss Syntrichia caninervis upon rehydration. JOURNAL OF PLANT PHYSIOLOGY 2010; 167:1390-7. [PMID: 20719403 DOI: 10.1016/j.jplph.2010.05.028] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/19/2010] [Revised: 05/07/2010] [Accepted: 05/17/2010] [Indexed: 05/12/2023]
Abstract
The moss Syntrichia caninervis (S. caninervis) is one of the dominant species in biological soil crusts of deserts. It has long been the focus of scientific research because of its ecological value. Moreover, S. caninervis has a special significance in biogenesis research because it is characterized by its fast restoration of photosynthesis upon onset of rehydration of the desiccated organism. In order to study the mechanisms of rapid photosynthetic recovery in mosses upon rewatering, we investigated the kinetics of the recovery process of photosynthetic activity in photosystem (PS) II, with an indirect assessment of the photochemical processes based on chlorophyll (Chl) fluorescence measurements. Our results showed that recovery can be divided into two phases. The fast initial phase, completed within 3 min, was characterized by a quick increase in maximal quantum efficiency of PSII (F(v)/F(m)). Over 50% of the PSII activities, including excitation energy transfer, oxygen evolution, charge separation, and electron transport, recovered within 0.5 min after rehydration. The second, slow phase was dominated by the increase of plastoquinone (PQ) reduction and the equilibrium of the energy transport from the inner antenna to the reaction center (RC) of PSII. Analysis of the recovery process in the presence of 3-(3,4-dichlorophenyl)-1,1-dimethyl urea (DCMU) revealed that blocking the electron transport from Q(A) to Q(B) did not hamper Chl synthesis or Chl organization in thylakoid membranes under light conditions. A de novo chloroplast protein synthesis was not necessary for the initial recovery of photochemical activity in PSII. In conclusion, the moss's ability for rapid recovery upon rehydration is related to Chl synthesis, quick structural reorganization of PSII, and fast restoration of PSII activity without de novo chloroplast protein synthesis.
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Affiliation(s)
- Yang Li
- Key Laboratory of Photobiology, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China
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Peltzer DA, Wardle DA, Allison VJ, Baisden WT, Bardgett RD, Chadwick OA, Condron LM, Parfitt RL, Porder S, Richardson SJ, Turner BL, Vitousek PM, Walker J, Walker LR. Understanding ecosystem retrogression. ECOL MONOGR 2010. [DOI: 10.1890/09-1552.1] [Citation(s) in RCA: 308] [Impact Index Per Article: 22.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Jackson BG, Martin P, Nilsson MC, Wardle DA. Response of feather moss associated N2 fixation and litter decomposition to variations in simulated rainfall intensity and frequency. OIKOS 2010. [DOI: 10.1111/j.1600-0706.2010.18641.x] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Gundale MJ, Wardle DA, Nilsson MC. Vascular plant removal effects on biological N fixation vary across a boreal forest island gradient. Ecology 2010; 91:1704-14. [PMID: 20583712 DOI: 10.1890/09-0709.1] [Citation(s) in RCA: 22] [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
There is currently much interest in understanding how biodiversity loss affects the functioning of ecosystems, but few studies have evaluated how ecosystem processes change in response to one another following biodiversity loss. We focused on a well-described gradient of 30 forested lake islands in northern Sweden, where island size determines the occurrence of lightning-ignited wildfire, which in turn determines successional stage, plant species composition, and productivity. We investigated the effect of biodiversity loss on biological nitrogen fixation by feathermosses through an experiment consisting of factorial removals of three understory shrub species (Vaccinium myrtillis, Vaccinium vitis-idaea, and Empetrum hermaphroditum) and two plant functional groups (shrubs and tree roots). We tested the hypothesis that, following vascular plant species loss, N fixation rates would be impaired by changes in pools or processes that increase extractable soil N, because changes in the supply rate of N to feathermosses should influence their demand for newly fixed N. Further, we hypothesized that the effects of removals on N fixation would depend on environmental context (i.e., island size), because it has been previously demonstrated that the effect of vascular plant species removal on N recycling pools and processes was strongest on productive islands. The data demonstrated that removal of two shrub species (V. vitis-idaea and E. hermaphroditum) negatively aflected the N fixation of Hylocomium splendens, but positively affected Pleurozium schreberi, resulting in unchanged areal N fixation rates. In the functional removal experiment, tree root removal resulted in a significant negative effect on N fixation. The effects of shrub and root removals on N fixation occurred only on small islands and thus were context dependent. This pattern did not correspond to the effect of shrub and root removal treatments on N-recycling pools or processes, which only occurred in response to specific vascular plant removals on large or medium islands. The data thus did not support our hypothesis that N fixation was directly responsive to changes in N-recycling pools or processes caused by vascular plant species removals, but instead highlighted the importance of species-specific interactions and environmental context in determining the manner in which biodiversity loss alters ecosystem processes.
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Affiliation(s)
- Michael J Gundale
- Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, SE901-83 Umeå, Sweden.
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Lindo Z, Gonzalez A. The Bryosphere: An Integral and Influential Component of the Earth’s Biosphere. Ecosystems 2010. [DOI: 10.1007/s10021-010-9336-3] [Citation(s) in RCA: 182] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Waite M, Sack L. How does moss photosynthesis relate to leaf and canopy structure? Trait relationships for 10 Hawaiian species of contrasting light habitats. THE NEW PHYTOLOGIST 2010; 185:156-72. [PMID: 19863726 DOI: 10.1111/j.1469-8137.2009.03061.x] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
Mosses are an understudied group of plants that can potentially confirm or expand principles of plant function described for tracheophytes, from which they diverge strongly in structure. We quantified 35 physiological and morphological traits from cell-, leaf- and canopy-level, for 10 ground-, trunk- and branch-dwelling Hawaiian species. We hypothesized that trait values would reflect the distinctive growth form and slow growth of mosses, but also that trait correlations would be analogous to those of tracheophytes. The moss species had low leaf mass per area and low gas exchange rate. Unlike for tracheophytes, light-saturated photosynthetic rate per mass (A(mass)) did not correlate with habitat irradiance. Other photosynthetic parameters and structural traits were aligned with microhabitat irradiance, driving an inter-correlation of traits including leaf area, cell size, cell wall thickness, and canopy density. In addition, we found a coordination of traits linked with structural allocation, including costa size, canopy height and A(mass). Across species, A(mass) and nitrogen concentration correlated negatively with canopy mass per area, analogous to linkages found for the 'leaf economic spectrum', with canopy mass per area replacing leaf mass per area. Despite divergence of mosses and tracheophytes in leaf size and function, analogous trait coordination has arisen during ecological differentiation.
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Affiliation(s)
- Mashuri Waite
- Department of Botany, University of Hawaii, 3190 Maile Way, Honolulu, HI 96822, USA
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Biological Nitrogen Fixation in Two Tropical Forests: Ecosystem-Level Patterns and Effects of Nitrogen Fertilization. Ecosystems 2009. [DOI: 10.1007/s10021-009-9290-0] [Citation(s) in RCA: 83] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Hyodo F, Wardle DA. Effect of ecosystem retrogression on stable nitrogen and carbon isotopes of plants, soils and consumer organisms in boreal forest islands. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2009; 23:1892-1898. [PMID: 19462406 DOI: 10.1002/rcm.4095] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
In the prolonged absence of catastrophic disturbance, ecosystem retrogression occurs, and this involves increased nutrient limitation, and reduced aboveground and belowground ecosystem processes rates. Little is known about how the nitrogen and carbon stable isotope ratios (delta(15)N and delta(13)C) of plants, soils and consumer organisms respond to retrogression in boreal forests. We investigated a 5000 year chronosequence of forested islands in the boreal zone of northern Sweden, for which the time since lightning-induced wildfire increases with decreasing island size, leading to ecosystem retrogression. For this system, tissue delta(15)N of three abundant plant species (Betula pubescens, Vaccinium myrtillus and Pleurozium schreberi) and humus all increased as retrogression proceeded. This is probably due to enhanced ecosystem inputs of N by biological fixation, and greater dependency of the plants on organic N during retrogression. The delta(13)C of B. pubescens and plant-derived humus also increased during retrogression, probably through nutrient limitation increasing plant physiological stress. Unlike the plants, delta(15)N of invertebrates (lycosid spiders and ants) did not increase during retrogression, probably because of their partial dependence on aquatic-derived prey that had a variable delta(15)N signature. The delta(13)C of the invertebrates increased as retrogression proceeded and converged towards that of an aquatic prey source (chironomid flies), suggesting increased dependence on aquatic-derived prey during retrogression. These results show that measurement of delta(15)N and delta(13)C of plants, soils, and consumers across the same environmental gradient can provide insights into environmental factors that drive both the aboveground and belowground subsystems, as well as the linkages between them.
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Affiliation(s)
- Fujio Hyodo
- Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, S901 83 Umeå, Sweden.
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Aboveground and Belowground Consequences of Long-Term Forest Retrogression in the Timeframe of Millennia and Beyond. ACTA ACUST UNITED AC 2009. [DOI: 10.1007/978-3-540-92706-8_9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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Variation in moss-associated nitrogen fixation in boreal forest stands. Oecologia 2009; 161:353-9. [PMID: 19543750 DOI: 10.1007/s00442-009-1391-0] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2008] [Accepted: 05/25/2009] [Indexed: 10/20/2022]
Abstract
Traditionally it has been thought that most boreal forest communities lack a significant input of biologically fixed nitrogen. Recent discoveries of nitrogen fixation by cyanobacteria associated with mosses have resulted in a re-evaluation of this view. While it is recognized that rates of nitrogen fixation in mosses can be highly variable, there is little understanding as to why this occurs. I monitored nitrogen fixation, using acetylene reduction, in wet lowland and dry upland boreal forest communities, in central Canada, over a growing season. At the peak of nitrogen fixation in mid summer, Sphagnum capillifolium had an 11 times higher rate of fixation than Pleurozium schreberi. Variation in canopy openness and precipitation had no effect on rates of fixation over the growing season. In P. schreberi fixation rates did not vary between sites. Temperature had a positive effect on fixation rates in both S. capillifolium and P. schreberi, but the effect was 4 times more pronounced in S. capillifolium. Seasonal rates of nitrogen fixation were estimated at 193 mg N m(-2) for S. capillifolium and 23 mg N m(-2) for P. schreberi. With moderate increases in climate warming, predicted increases in nitrogen fixation in S. capillifolium are sufficient to raise its decomposition rate. Increased temperatures may therefore act synergistically to change boreal systems from a sink to a source of carbon.
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Wardle DA, Bardgett RD, Walker LR, Bonner KI. Among- and within-species variation in plant litter decomposition in contrasting long-term chronosequences. Funct Ecol 2009. [DOI: 10.1111/j.1365-2435.2008.01513.x] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Nitrogen fixation in mixed Hylocomium splendens moss communities. Oecologia 2009; 160:309-19. [DOI: 10.1007/s00442-009-1299-8] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2008] [Accepted: 01/22/2009] [Indexed: 10/21/2022]
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