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JOURNAL OF PLANKTON RESEARCH | VOLUME 13 | NUMBER 1 | PAGES 155-166 | 1991
© Oxford University Press

research-article

Cannibalistic feeding behavior of the brackish-water copepod Sinocalanus tenellus

Akio Hada and Shin-ichi Uye

Faculty of Applied Biological Science, Hiroshima University Shitami, Saijo-cho, Higashi-Hiroshima 724, Japan

Received on April 3, 1990; revised on August 28, 1990 Cannibalistic feeding behavior of the brackish-water copepod Sinocalanus tenellus was examined in the laboratory using CI-II, CIII-IV and CVI female as predators and NI-II, NIII-IV, NV-VI and CI-II as prey. In each prey-predator combination, the ingestion rate increased with increasing prey density to an asymptotic value. Cannibalism took place even when phytoplankton was available as an alternative food supply. Based on a daily ration, the optimal prey stages for CVI females, CIII-IV and CI-II are NI-VI, NI-IV and NI-II respectively. Under average, natural prey density (10 nauplii l–1), S tenellus can achieve only a small fraction (max 9%) of the daily minimum food requirement by cannibalistic feeding. However, the impact of cannibalism on naupliar survivorship can be significant. When adult females occur at a density of 10 l–1, the mortality due to cannibalism attains 99.2% during the naupliar stages.


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