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Aquatic Microbial Ecology

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AME 47:99-106 (2007)  -  doi:10.3354/ame047099

Bacteria associated with copepods: abundance, activity and community composition

Eva Friis Møller1,2,*, Lasse Riemann3, Morten Søndergaard1

1Freshwater Biological Laboratory, University of Copenhagen, Helsingørsgade 51, 3400 Hillerød, Denmark
2Department of Marine Ecology and Aquaculture, Danish Institute for Fisheries Research, Kavalergården 6, 2920 Charlottenlund, Denmark
3School of Pure and Applied Natural Sciences, Kalmar University, 391 82 Kalmar, Sweden

ABSTRACT: We measured abundance, activity and community composition of bacteria associated with Calanus spp. in the North Sea in late July and compared it to the free living bacteria. Both the local density and production of bacteria associated with Calanus spp. were magnitudes higher than the average in a comparable volume of water. As analyzed by denaturing gradient gel electrophoresis (DGGE) and 16S rRNA gene sequencing, the bacterial community associated with Calanus spp. consisted of members of the Roseobacter lineage (Alphaproteobacteria), whereas the free living bacteria were more diverse. Discovery of an identical bacterial phylotype on Calanus spp. and in the free living community at the specific depth with the highest Calanus spp. biomass suggested an active exchange of bacteria between copepods and the free living state.

KEY WORDS: Calanus spp. · Attached bacteria · Bacterial production · Community composition

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