EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021
(Virtually the same conference, without elevators, airplane tickets, or hotel room keys)
5/25/2021 | 2:00 PM - 3:30 PM | EFFECTS OF HABITAT SPECIFIC PRIMARY PRODUCTION ON FISH BIOMASS, PRODUCTION AND SIZE IN NORTHERN EUROPEAN LAKES | Virtual Platform
EFFECTS OF HABITAT SPECIFIC PRIMARY PRODUCTION ON FISH BIOMASS, PRODUCTION AND SIZE IN NORTHERN EUROPEAN LAKES
Most fish species undergo ontogenetic niche shifts feeding on small sized prey like pelagic zooplankton as young while they with increasing size shift to larger prey such as benthic invertebrates. Theory suggest that, besides the total productivity of an ecosystem, the relative resource production between the pelagic and benthic habitats may have major effects on the production and population biomass of fish. We studied lake populations of Arctic char and brown trout in oligotrophic lakes in northern Sweden and find support for that increasing proportion of benthic production, which provides resources mainly for adult fish, results in higher population biomass and larger maximum and mean sizes of fish – regardless of the total productivity of the benthic habitat alone or the ecosystem as a whole. We link our results to theory on the effects of ontogenetic asymmetry in energetic efficiency between juvenile and adult fish.
- Species interactions
- Habitat
- Resource subsidies
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Presenters/Authors
Sven Norman
(), Umeå university, Department of Ecology and Environmental Science, sven.norman@umu.se;
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