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JPR Advance Access published online on October 5, 2005
Journal of Plankton Research, doi:10.1093/plankt/fbi078
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Published by Oxford University Press.
Received June 6, 2005
Accepted September 28, 2005

Article

Interannual variability in a predator-prey interaction: climate, chaetognaths, and copepods in the southeastern Bering Sea

C.T. Baier 1* and M. Terazaki 2*

1 NOAA/NMFS/AFSC, Seattle, USA, Christine
2 Ocean Research Institute, U. Tokyo, Tokyo, Japan

* To whom correspondence should be addressed.
C.T. Baier, E-mail: Baier{at}noaa.gov
M. Terazaki, E-mail: terazaki{at}ori.u-tokyo.ac.jp


  Abstract

The interaction of the chaetognath Sagitta elegans with the copepod community of the southeast Bering Sea middle shelf was examined in relation to environmental conditions during 1995-1999. Predation impact was estimated for two years, 1995 and 1997, using gut content analysis, experimentally-derived digestion time, and abundances of chaetognaths and prey. Pseudocalanus concentrations correlated with water temperature, and Calanus marshallae with sea ice extent. S. elegans were less abundant but individuals were larger in 1995, when C. marshallae predominated, compared to 1997, when Pseudocalanus and Acartia were the primary prey. Predation by S. elegans removed <1 % standing stock day-1 of Pseudocalanus or C. marshallae in 1995, and 1.7 % to 2.3 % of Pseudocalanus in 1997. The percent of the copepod community biomass required by chaetognaths was estimated to be <1% in 1995, compared with 8 to 12% in 1997. C. marshallae may be more vulnerable than Pseudocalanus to cumulative predation effects because of its reproductive strategy. The effect of chaetognath predation on the copepod community depends on which copepod species is predominant and its susceptibility to cumulative predation effects, as well as on daily predation impact, both of which varied between years with different climatic conditions.

Communicating Editor: R.P. Harris
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