Bacteria associated with a marine planktonic copepod in culture. II. Degradation of fecal pellets produced on a diatom, a nanoflagellate or a dinoflagellate diet |
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Authors: | Hansen B; Fotel FL; Jensen NJ; Madsen SD |
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Institution: | University of Roskilde, Department of Life Sciences & Chemistry PO Box 260, DK-4000 Roskilde, Denmark |
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Abstract: | Copepods (A cartia tonsa Dana) were allowed to feed on culturedalgal species simulating the yearly boreal phytoplankton succession,where the spring is characterized by diatoms, the summer bynanoflagellates and the autumn by dinoflagellates. Degradationof freshly produced fecal pellets in suspension was followedover time by volume recording and estimation of carbon loss.The fecal pellets produced on a diatom diet were very denseand showed a significantly slower degradation than those producedon nanoflagellate or dinoflagellate diets. This indicates thatthe algal texture, i.e. the mechanical robustness given by inertstructures, determines the degradation rate of the pellets.The degradation rate was also very dependent on the algal concentrationfor the grazer (565 µg Cl1 T1 |
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