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  Impacts of copepods on marine seston, and resulting effects on Calanus finmarchicus RNA : DNA ratios in mesocosm experiments

Becker, C., Brepohl, D., Feuchtmayr, H., Zöllner, E., Sommer, F., Clemmesen, C., et al. (2005). Impacts of copepods on marine seston, and resulting effects on Calanus finmarchicus RNA: DNA ratios in mesocosm experiments. Marine Biology, 146(3), 531-541. doi:10.1007/s00227-004-1459-7.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-000F-D9F9-A Version Permalink: http://hdl.handle.net/11858/00-001M-0000-000F-D9FA-8
Genre: Journal Article

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 Creators:
Becker, C.1, Author              
Brepohl, D., Author
Feuchtmayr, H.1, Author              
Zöllner, E.1, Author              
Sommer, F., Author
Clemmesen, C., Author
Sommer, U.1, Author              
Boersma, M.1, Author              
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1Department Ecophysiology, Max Planck Institute for Limnology, Max Planck Institute for Evolutionary Biology, Max Planck Society, ou_976547              

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 Abstract: We investigated the impact of copepods on the seston community in a mesocosm set-up, and assessed how the changes in food quantity, quality and size affected the condition of the grazers, by measuring the RNA:DNA ratios in different developmental stages of Calanus finmarchicus. Manipulated copepod densities did not affect the particulate carbon concentration in the mesocosms. On the other hand, chlorophyll a content increased with higher copepod densities, and increasing densities had a positive effect on seston food quality in the mesocosms, measured as C:N ratios and omega3:omega6 fatty acid ratios. These food quality indicators were significantly correlated to the nutritional status of C. finmarchicus. In contrast to our expectations, these results suggest a lower copepod growth potential on higher quality food. However, in concordance with earlier studies, we found that when copepods were in high densities the large particles (>1000 mum(3)) decreased and that the smaller particles (<1000 mum(3)) increased in number. These patterns were closely linked to the condition of C. finmarchicus, which were of better condition (RNA:DNA ratios) with increasing biovolumes of large particles, and, conversely, lower RNA:DNA ratios with increasing biovolumes of smaller particles. Consequentially, the selective grazing by copepods stimulated increased biovolumes of smaller plankton, and this increase was responsible for the increased food quality, in terms of C:N and omega3:omega6 ratios. Thus, we conclude that the decreasing growth potentials of C. finmarchicus were a result of a decrease of favourably sized food particles, induced by copepod grazing.

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Language(s): eng - English
 Dates: 2005-02
 Publication Status: Published in print
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 Identifiers: eDoc: 217940
DOI: 10.1007/s00227-004-1459-7
Other: 2375/S 38353
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Title: Marine Biology
Source Genre: Journal
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Pages: - Volume / Issue: 146 (3) Sequence Number: - Start / End Page: 531 - 541 Identifier: ISSN: 0025-3162