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Title [sv]
Kontroll av sjöproduktivitet: effekter av ljus, terrestert organiskt material och födovävsstruktur
Title [en]
Control of lake productivity: effects of light, terrestrial organic matter and food web structure
Abstract [sv]
Research shows that nutrient poor lake ecosystems are limited by light rather than by nutrients. Thus, the prevailing nutrient limitation paradigm is insufficient for explaining the function of a majority of lakes in temperate, boreal and arctic regions. The reason for this poor understanding is (1) that existing models focus on the pelagic habitat, thereby neglecting that much of the production and resource use takes place in the benthic habitat, and (2) that these models does not consider that the large amounts of organic matter (OM) imported from terrestrial surroundings has a fundamental role by both absorbing light and serving as a carbon and energy source for heterotrophs. The aim of this study is to increase the understanding of how productivity is controlled in nutrient poor lake ecosystems. The project will (i) study the importance of different factors controlling the production of benthic algae, (ii) quantify differences in nutrient use and trophic transfer efficiency in different types of lakes, and (iii) assess the net effect (repressor or subsidizer) of terrestrial OM on lake productivity. The project includes laboratory microcosm experiments, field mesocosm experiments and long-term whole lake experiments. Measurements include the basal production in benthic and pelagic habitats, the transfer of energy trough the food web and the growth of fish top consumers, and how these aspects are related to abiotic (light, nutrients, terrestrial OM) characteristics.
Principal InvestigatorKarlsson, Jan
Coordinating organisation
Umeå University
2012-01-01 - 2015-12-31
National Category
Oceanography, Hydrology, Water Resources
DiVA, id: project:1179Project, id: 2011-03908_VR

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