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Observations of copepod feeding and vertical distribution under natural turbulent conditions in the North Sea

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Abstract

We present results of simultaneous measurements of turbulent-dissipation rate, zooplankton vertical distribution and copepod gut pigments in the northern North Sea. Analysis shows that some, but not all, copepods (by species, sex and stage) exhibit significant dependence on turbulence in respect to vertical distribution and feeding rate. Oithona similis (female and copepodite stages) exhibits an avoidance of the surface layer when turbulence is strong there. For the range of turbulence (10−7 to 10−3 m2 s−3) and ambient chlorophyll concentration (0.5–0.8 μg l−1) encountered, Calanus spp. and Metridia lucens exhibited a significant negative response in feeding-rate index with increasing turbulence. Centropages typicus and Pseudocalanus spp. also exhibited a negative response but of less significance.

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Authors and Affiliations

  1. Danish Institute for Fisheries Research, Department of Marine Ecology and Aquaculture, Kavalergården 6, 2920 Charlottenlund, Denmark e-mail: awv@dfu.min.dk, , , , , , DK

    A. W. Visser

  2. Biological Oceanography Section, Hokkaido National Fisheries Research Institute, Katsurakoi 116, Kushiro 085-0802, Japan, , , , , , JP

    H. Saito

  3. Institut de Ciències del Mar, CSIC, Ps. Joan de Borbó s/n, 08039 Barcelona, Catalonia, Spain, , , , , , ES

    E. Saiz

  4. Danish Institute for Fisheries Research, Department of Marine Ecology and Aquaculture, Kavalergården 6, 2920 Charlottenlund, Denmark, , , , , , DK

    T. Kiørboe

Authors
  1. A. W. Visser
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  2. H. Saito
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  3. E. Saiz
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  4. T. Kiørboe
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Received: 12 October 2000 / Accepted: 11 December 2000

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Visser, A., Saito, H., Saiz, E. et al. Observations of copepod feeding and vertical distribution under natural turbulent conditions in the North Sea. Marine Biology 138, 1011–1019 (2001). https://doi.org/10.1007/s002270000520

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  • DOI: https://doi.org/10.1007/s002270000520

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