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Tiselius, P. ., Univeristy of Gothenburg, Fiskeb├Ąckskil, Sweden, peter.tiselius@marecol.gu.se
Hansen, B. W., Roskilde University, Roskilde, Denmark, bhansen@ruc.dk
Calliari, D. ., Universidad de la Rep├║blica, Montevideo, Uruguay, dcalliar@fcien.edu.uy

ZOOPLANKTON AS TRANSFORMERS: FATTY ACID CONTENT AND CONVERSION FROM SESTON TO BENTHOS

We sampled seston, zooplankton and sediment trap material for fatty acid (FA) analysis during 5 campaigns spanning four seasons at a coastal site on the west coast of Sweden. Saturated (SAFA) and monounsaturated (MUFA) FAs dominated seston and trap material, while copepods contained 75-90% polyunsaturated FAs (PUFA). Sedimentation of bulk particulate organic carbon did not vary significantly with season, while pigment and in particular faecal pellet fluxes were highly variable as a result of copepod feeding. Copepod feeding, pellet and egg production were all high in summer and after the spring bloom and this resulted in a significant difference in FA composition between seston and sedimenting matter. SAFAs and MUFAs were enriched by 5-10% in sediment traps, while the sedimentation of the most important PUFA, docosahexaenoic acid (DHA), was reduced by up to 15% in summer and autumn. Overall, 5-25% of the sedimenting FAs were affected by copepod transformation with the highest transformation in the summer and autumn.

Poster presentation

Session #:146
Date: 2/20/2012
Time: 08:00 - 10:00
Location: Poster/Exhibit Hall

Presentation is given by student: No

PosterID: A0614