Planktivorous vendace (Coregonus albula) utilise algae-derived fatty acids for biomass increase and lipid deposition
Strandberg, U., Hiltunen, M., Taipale, S., Yeung, S., & Kankaala, P. (2018). Planktivorous vendace (Coregonus albula) utilise algae-derived fatty acids for biomass increase and lipid deposition. Ecology of Freshwater Fish, 27(2), 533-541. https://doi.org/10.1111/eff.12367
Published inEcology of Freshwater Fish
© 2017 John Wiley & Sons A/S.
Spatial and seasonal variation in the abundance and composition of phytoplankton and other basal resources (bacteria, terrestrial detritus) influence the availability of essen-tial polyunsaturated fatty acids (PUFA) for upper trophic levels in lake food webs. We studied accumulation, composition and content of fatty acids in planktivorous ven-dace (Coregonus albula) muscle tissue during the summer feeding period (May to late September) in six boreal lakes. Vendace muscle fatty acid content increased from ~17.7 mg/g DW to ~28.1 mg/g DW from spring to summer, corresponding to a ~59% increase in total fatty acids. PUFA accounted for 45%–65% of all fatty acids, and the most abundant fatty acid was docosahexaenoic acid (DHA, 22:6n- 3). The DHA con-tent remained relatively constant throughout the sampling period (~7–8 mg/g DW), but the proportion of DHA decreased from ~40% in spring to ~30% in summer and autumn. The decrease in DHA proportion was due to accumulation of other fatty acids, primarily C18 PUFA (predominantly synthetised by algae) and monounsaturated fatty acids. A similar fatty acid accumulation pattern was observed in lipid storing co-pepods, an important prey for planktivorous vendace. The abundance of bacterial and terrestrial biomarker fatty acids in vendace muscle and prey items was low (<5% and <0.1% respectively). The increase in weight and the deposition of internal energy stores in vendace were achieved predominantly by algae- based food chain. This has ecological implications, as vendace requires sufficient lipid stores for reproduction in autumn and survival over winter. ...
PublisherWiley-Blackwell Publishing, Inc.
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