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Project grant
Title [sv]
Effekter av oorganisk kväveberikning på produktivitet, födovävsstruktur och trofisk överföringseffektivitet i klara och humösa sjöar
Title [en]
Effects of inorganic N enrichment on ecosystem productivity, food web structure, and trophic transfer efficiency in clear-water and humic lakes
Abstract [sv]
Elevated nitrogen (N) deposition due to anthropogenic activities provides major impacts on lake ecosystems worldwide. The aim of this study is to assess the effects of elevated inorganic N input from N deposition on ecosystem productivity and food web structure (from base to fish) in unproductive clear-water and humic lakes. The hypotheses will be tested in whole lake enrichment- and mesocosms experiments. Measurements include basal productivity by autotrophic and heterotrophic processes in the pelagic habitat, growth and carbon support of consumers (zooplankton and fish), and food stoichiometric imbalances between phytoplankton and zooplankton. The applicant has shown that phytoplankton in unproductive lakes is N limited, and that enhanced input of inorganic N from N deposition increases primary production and phytoplankton biomass in unproductive lakes over large areas of Europe and North America. Because pelagic primary production for long have been regarded as being primarily phosphorus limited, effects of enhanced N deposition, on ecosystem productivity in clear-water and humic lakes has been largely overlooked. Both N-deposition and catchment export of terrestrial dissolved organic carbon are sensitive to changes in climate and are connected to anthropogenic usage of fossil fuels and artificial fertilizers. Hence, the results will bring insight in how global climatic drivers will affect ecosystems productivity and food web structure of unproductive lakes.
Principal InvestigatorBergström, Ann-Kristin
Coordinating organisation
Umeå University
Funder
Period
2011-01-01 － 2013-12-31
Identifiers
DiVA, id: project:1038Project, id: 2010-04675_VR

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