Landscape Controls on Nutrient Stoichiometry Regulate Lake Primary Production at the Margin of the Greenland Ice Sheet
| Autor: | Clay Prater, N. John Anderson, Joanna E. Bullard, Sarah L. Martin, Christopher L. Osburn, Michael J. Watts |
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| Jazyk: | angličtina |
| Rok vydání: | 2022 |
| Předmět: |
Biogeochemical cycle
Greenland ice sheet Atmospheric deposition Biogenic silica Nutrient Arctic Paraglacial Limnology Environmental Chemistry Ecosystem Ecology Evolution Behavior and Systematics Ekologi geography geography.geographical_feature_category biology Ecology Diatom Biogeochemistry biology.organism_classification Miljövetenskap Ecological stoichiometry Nutrient limitation Environmental science Ice sheet Environmental Sciences |
| Popis: | 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 (13C 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. |
| Databáze: | OpenAIRE |
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