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Landscape Controls ...
Landscape Controls on Nutrient Stoichiometry Regulate Lake Primary Production at the Margin of the Greenland Ice Sheet
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- Prater, Clay (författare)
- Geography and Environment, Loughborough University, Loughborough, United Kingdom
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- Bullard, Joanna E. (författare)
- Geography and Environment, Loughborough University, Loughborough, United Kingdom
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- Osburn, Christopher L. (författare)
- Department of Marine, Earth and Atmospheric Science, North Carolina State University, NC, Raleigh, United States
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- Martin, Sarah L. (författare)
- Geography and Environment, Loughborough University, Loughborough, United Kingdom
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- Watts, Michael J. (författare)
- Inorganic Geochemistry, Centre for Environmental Geochemistry, British Geological Survey, Keyworth, United Kingdom
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- Anderson, N. John (författare)
- Umeå universitet,Institutionen för ekologi, miljö och geovetenskap,Geography and Environment, Loughborough University, Loughborough, United Kingdom
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(creator_code:org_t)
- 2021-08-17
- 2022
- Engelska.
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Ingår i: Ecosystems (New York. Print). - : Springer. - 1432-9840 .- 1435-0629. ; 25, s. 931-947
- Relaterad länk:
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https://doi.org/10.1...
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https://umu.diva-por... (primary) (Raw object)
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https://link.springe...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Global change is reshaping the physical environment and altering nutrient dynamics across the Arctic. These changes can affect the structure and function of biological communities and influence important climate-related feedbacks (for example, carbon (C) sequestration) in biogeochemical processing hot spots such as lakes. To understand how these ecosystems will respond in the future, this study examined recent (< 10 y) and long-term (1000 y) shifts in autotrophic production across paraglacial environmental gradients in SW Greenland. Contemporary lake temperatures and light levels increased with distance from the ice sheet, along with dissolved organic C (DOC) concentrations and total nitrogen:total phosphorus (TN:TP) ratios. Diatom production measured as biogenic silica accumulation rates (BSiARs) and diatom contribution to microbial communities declined across these gradients, while total production estimated using C accumulation rates and δ13C increased, indicating that autochthonous production and C burial are controlled by microbial competition and competitive displacement across physiochemical gradients in the region. Diatom production was generally low across lakes prior to the 1800's AD but has risen 1.5–3× above background levels starting between 1750 and 1880 AD. These increases predate contemporary regional warming by 115–250 years, and temperature stimulation of primary production was inconsistent with paleorecords for ~ 90% of the last millennium. Instead, primary production appeared to be more strongly related to N and P availability, which differs considerably across the region due to lake landscape position, glacial activity and degree of atmospheric nutrient deposition. These results suggest that biological responses to enhanced nutrient supply could serve as important negative feedbacks to global change.
Ämnesord
- NATURVETENSKAP -- Biologi -- Ekologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Ecology (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Environmental Sciences (hsv//eng)
Nyckelord
- Arctic
- Atmospheric deposition
- Biogenic silica
- Biogeochemistry
- Diatom
- Ecological stoichiometry
- Limnology
- Nutrient limitation
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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