Selective transfer of polyunsaturated fatty acids from phytoplankton to planktivorous fish in large boreal lakes.

摘要: Lake size influences various hydrological parameters, such as water retention time, circulation patterns and thermal stratification that can consequently affect the plankton community composition, benthic-pelagic coupling function of aquatic food webs. Although socio-economical (particularly commercial fisheries) ecological importance large lakes has been widely acknowledged, little is known about availability trophic transfer polyunsaturated fatty (PUFA) in lakes. The objective this study was to investigate trajectories PUFA pelagic web (seston, zooplankton, planktivorous fish) six boreal Finnish District. Docosahexaenoic acid (DHA), eicosapentaenoic (EPA) α-linolenic (ALA) were most abundant organisms, particularly zooplanktivorous fish. Our results show from n-3 family (PUFAn-3), often associated with marine webs, are also proportion DHA increased ~4±3% seston ~32±6% vendace (Coregonus albula) smelt (Osmerus eperlanus), whereas ALA showed opposite pattern highest values observed (~11±2%) lowest opossum shrimp (Mysis relicta) fish (~2±1%). dominance diatoms cryptophytes at base accounted for high amount PUFAn-3 planktonic consumers. Furthermore, abundance copepods explains effective composition these supports a fishery resource (vendace) very nutritional quality (in terms EPA contents) humans.