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JPR Advance Access published online on February 22, 2006
Journal of Plankton Research, doi:10.1093/plankt/fbi143
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Published by Oxford University Press 2006.
Received October 5, 2005
Accepted February 15, 2006

Article

Capelin larvae (Mallotus villosus) and community structure of zooplankton off the coast of northern Norway

Maria Fossheim 1 *, Kurt S. Tande 1, Tatjana Semenova 2, and Alexander Timonin 2

1 Norwegian College of Fishery Science, University of Tromsø, 9037 Tromsø, Norway
2 P.P. Shirshov Institute of Oceanology, Russian Academy of Sciences, Nakhimovsky pr.36, Moscow 117218, Russia

* To whom correspondence should be addressed.
Maria Fossheim, E-mail: mariaf{at}nfh.uit.no


  Abstract

Capelin larvae (Mallotus villosus) and mesozooplankton were collected in May 2001 in the southern part of the Barents Sea. During the period of hatching and first feeding capelin larvae experience high mortality rates. In order to understand the underlying mechanisms influencing larval survival we monitored a selected site for ten days using a variety of different sampling approaches. Hydrological parameters (CTDF) were recorded and zooplankton samples were obtained simultaneously using MOCNESS at three time periods. The mesozooplankton consisted essentially of copepods (85 %), dominated by Calanus finmarchicus. The zooplankton community consisted of different assemblages derived from different areas (i.e. different water masses; Atlantic and coastal). Capelin larvae were found in surficial coastal waters. Copepod nauplii and Calanus finmarchicus were less abundant in coastal waters where small copepodites (such as Acartia spp. and Temora longicornis) were found together with early stages of coastal invertebrates that are possible prey for capelin larvae. We suggest that capelin larvae base their foraging on small prey organisms frequently found among the coastal zooplankton and that these larvae are less dependent on the propagation of the recruiting generation of Calanus finmarchicus present from April to June.

Communicating Editor: KJ Flynn


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