Powell, M.D. & A.J. Berry. (1990). Ingestion and regurgitation of living and inert materials by the estuarine copepod Eurytemora affinis (Poppe) and the influence of salinity. Estuarine, Coastal and Shelf Science. 31(6):763-773.

109006

Powell, M.D. & A.J. Berry

1990

31(6):763-773.

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Eurytemora afinis Introduction Copepods rate of such large O272-7714/90/X20763+ diatoms by Eucalanus pileatus. 11 $03.00/O @ 1990 Academic Press Limited Ingestion and Regurgitation of Living and Inert Materials by the Estuarine Copepod Eurytemora afinis (Poppe) and the Influence of Salinity (Poppe) fed on cultured Thalassiosira weissjlogii (Grunnow) at rates of 200-34 000 cells copepod-’ h -‘. Feeding was delayed and diminished in bright light. In dim light, feeding was initially faster in 15X (27 000-34 000 copepod-’ h-‘) than in loo/o0 (23 000-25 000 copepod-’ h-‘) and much faster than in 3% (6000 copepod..’ h-‘). After l-3 h, feeding continued more steadily in 30/w (1200-6500 copepod--‘h-l) but slowed drastically in 10 and 15% to 200-5000 copepod-’ h-l). These patterns were maintained when copepods were first acclimated briefly to the test salinities. E. afinis fed at slightly higher rates on sterile latex beads of similar size to T. weissjloggi, fastest in 100/Wand slowest in 3%. While the beads appeared in the guts, they did not appear in the faecal pellets and after 1 h (10, 15’%0) or 3 h (3%0), their numbers in suspension recovered close to original counts. In contrast, beads infected with a marine bacterium were similarly eaten (at slightly higher rates than the sterile beads), and appeared in the guts and then in the faecal pellets, while numbers in suspension continued to fall or remained low. The contrasts between initial rapid feeding in lo-15%0 and slower steadier feeding in 3%, and between regurgitation of swallowed sterile beads and passage through the gut of bacterially-contaminated beads, have significance for the biology of a copepod living in the upper reaches of an estuary.

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