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Title [sv]
Ett globalt kväveanrikningsexperiment - Kvävedepositionens roll för näringsbegränsning av växtplankton och djurplankton i lågproduktiva sjöar
Title [en]
A Global Nitrogen Enrichment Experiment (AGNEE) - Role of nitrogen deposition on nutrient limitation of phytoplankton and zooplankton in low productive lakes
Abstract [sv]
Variation in atmospheric nitrogen (N) deposition due to anthropogenic activities have profound effects on the chemistry and biology of lake ecosystems worldwide. Our previous research has shown that there are dramatic variations in productivity, nutrient biogeochemistry, and food chain structure among low productivity lakes in the Northern biosphere. The proposed research program will assess on a global scale two critical knowledge gaps: How rates of N deposition control lake dissolved inorganic N (DIN):total phosphorus (TP) stoichiometry, nutrient limitation of phyto- and zooplankton, and the consequence of these biogeochemical changes on the nutritional quality of the food web; and (2) How catchment structure and function may serve to mitigate unwanted changes in lake ecosystem stoichiometry. This will be researched in A Global N Enrichment Experiment, i.e. on low productive lakes in Sweden and Canada/US along a similar climate and wet DIN deposition gradient (<1 to 8-10 kg N/ha/yr) located across a latitudinal range from 45-68 deg N. We will use N deposition, satellite remote sensing- and GIS data to determine the influence of catchment structure in regulating DIN:TP ratios in lakes. We will establish how DIN:TP ratios influence biomass, composition and elemental stoichiometry of phyto- and zooplankton communities; and perform bioassay enrichment experiments to determine nutrient limiting factors of phytoplankton and consumer driven nutrient regeneration responses.
Principal InvestigatorBergström, Ann-Kristin
Coordinating organisation
Umeå University
Funder
Period
2015-01-01 － 2018-12-31
National Category
Climate ResearchOther Earth and Related Environmental SciencesEcology
Identifiers
DiVA, id: project:1348Project, id: 2014-05909_VR
v. 2.46.0
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