Fatty acids in profundal benthic invertebrates and their major food resources in Lake Erken, Sweden: seasonal variation and trophic indications

Fatty acid (FA) concentrations and their seasonal variations were quantified for profundal benthic invertebrates, surficial sediment, and sedimenting matter from Lake Erken, Sweden. Food quality for profundal zoobenthos, as indicated by the concentrations of long-chain polyunsaturated FA, ω3 FA, or...

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Bibliographic Details
Published in:Canadian journal of fisheries and aquatic sciences 2000-11, Vol.57 (11), p.2267-2279
Main Authors: Goedkoop, Willem, Sonesten, Lars, Ahlgren, Gunnel, Boberg, Merike
Format: Article
Language:English
Subjects:
Animal and plant ecology
Animal, plant and microbial ecology
Benthic fauna
Biological and medical sciences
Fatty acids
Food chains
Food quality
Food resources
Fresh water ecosystems
Freshwater
Fundamental and applied biological sciences. Psychology
Invertebrata
Invertebrates
Lakes
Marine ecosystems
Seasonal variations
Seasons
Sediments
Sweden
Synecology
Zoobenthos
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Summary:Fatty acid (FA) concentrations and their seasonal variations were quantified for profundal benthic invertebrates, surficial sediment, and sedimenting matter from Lake Erken, Sweden. Food quality for profundal zoobenthos, as indicated by the concentrations of long-chain polyunsaturated FA, ω3 FA, or eicosapentaenoic acid (EPA) in sediment and sedimenting matter, was highest in spring and autumn and markedly lower in summer. Surficial sediment was consistently lower in all FA than was sedimenting matter. Palmitoleic acid (16:1ω7) was the dominating FA in both sedimenting matter and sediment. In fauna samples, EPA, palmitic acid (16:0), palmitoleic acid, and vaccenic acid (18:1ω7) were among the dominant FA. Docosahexaenoic acid was found only in the predators Chaoborus and Procladius. Differences between functional feeding guilds were found for the diatom-indicating FA palmitoleic acid and the bacteria-specific FA isoseptadecanoic acid (17:0iso). Furthermore, principal components analysis showed marked differences in FA composition among taxa. These differences reflect the relative contribution of food from autotrophic (phytoplankton production) and heterotrophic sources (detrital food web) in profundal invertebrate taxa.
ISSN:0706-652X
1205-7533
DOI:10.1139/f00-201