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In order to examlne feeding selectivity by copepods, females of Calanus helgolandicus were allowed to graze on a mixture of three different chain-forming diatoms: Thalassiosira rotula (40 X 15 pm), Chaetoceros pseudocurvisetus (0 15 pm) and Stephanopyxis palrneriana (85 X 45 pm). T. rotula was deliberately offered at higher abundancies. C, helgolandicus filter a higher rate of C. pseudocurvisetus than of S. palmeriana and T. rotula, and graze preferentially on this spiny form. During experiments, T rotula rarely decrease, and electivity regarding this species was always negative; in contrast, on S. palmeriana and C. pseudocurvisetus it was always positive. Net particle production occurred only in the smaller chains (2, 3 and 4 cells per chain) of S. palrneriana; net particle removal was recorded on all phytoplankton species, but in S. palmeriana only on single cells and longer chains. Within a given species, removal pressure was high on large chains of S. palmeriana and T. rotula, whereas in C. pseudocum~sehrs a greater variability prevailed. Maximum removal occurred at or near modal peaks.

Feeding of Calanus helgolandicus on Phytoplankton Mixtures