SS4.10 Interdisciplinary Contributions to the Maintenance of the Integrity of Aquatic Ecosystems
Date: Tuesday, June 11, 2002
Time: 4:30:00 PM
Location: Colwood
 
Van NieuwerburghL, Uppsala University, EBC, Dept. Plant Ecology, Uppsala, Sweden, Lies.Van_Nieuwerburgh@ebc.uu.se
Wänstrand, I, , Uppsala University, EBC, Dept. Plant Ecology, Uppsala, Sweden, Ingrid.Wanstrand@ebc.uu.se
Snoeijs, P, , Uppsala University, EBC, Dept. Plant Ecology, Uppsala, Sweden, Pauli.Snoeijs@ebc.uu.se
 
PIGMENT TRANSFER FROM MICROALGAE TO COPEPODS IN GRAZING EXPERIMENTS
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Grazing experiments were performed to study the pigment transfer from microalgae to copepods and to find out which algae promote astaxanthin production in copepods in the Baltic Sea. This study was performed in connection with the M74 syndrome, a reproductive disturbance in the Baltic salmon. Indications of oxidative stress and deficiency of the carotenoid astaxanthin (a strong antioxidant) have been recorded in salmon suffering from M74. We hypothesize that changes in microalgal composition and biomass as a consequence of eutrophication may affect astaxanthin production in copepods and its transfer to higher trophic levels (herring, salmon). Ten grazing experiments were carried out in summer 2000. Single and multiple species cultures of several algal groups, including Haematococcus cysts with high astaxanthin content, were fed to wild copepod communities. The percentages of copepod survival and algal cells consumed were recorded and transfer ratios of carotenoids from algae to copepods were calculated.