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JOURNAL OF PLANKTON RESEARCH | VOLUME 14 | NUMBER 1 | PAGES 71-96 | 1992
© Oxford University Press

research-article

Feeding, excretion and egg production by individuals and populations of the marine, planktonic copepods, Acartia spp. and Centropages furcatus

David M. Checkley, Jr, Michael J. Dagg1 and Shin-ichi Uye2

Department of Marine, Earth, and Atmospheric Sciences, Box 8208, North Carolina State University, Raleigh, NC 27695-8208, USA 1Louisiana Universities Marine Consortium Chauvin, LA 70344, USA 2Faculty of Applied Biological Science, Hiroshima University Shitami, Saijo-Cho, Higashi-Hiroshima 724, Japan

Received on September 3, 1990; accepted on July 29, 1991 Diel variations in vertical distribution, gut pigment content, ammonium excretion and egg production were investigated for adult females of Acartia erythraea and A.pacifica in the vertically mixed Inland Sea of Japan and Centropages furcatus in the stratified, neritic Gulf of Mexico. Gut pigment content and egg production rate were maximal at night and ammonium excretion was maximal during the daytime. Neither A.erythraea nor A.pacifica adult females showed an apparent diel migration, but the former were highly concentrated in the surface layer during the afternoon. In contrast, C.furcatus adult females showed a clear diel migration, residing immediately above the bottom during the daytime and being concentrated between 10 and 25 m depth during the nighttime. Individual-based data on gut content and excretion and egg production rates were combined with vertical-distribution data to calculate population values. In the Inland Sea of Japan, the resultant pattern for Acartia spp. reflected the diel variation in physiological rates and even distribution of adult females, except for the afternoon, surface aggregation of A.erythraea. In the Gulf of Mexico, the pattern for C.furcatus reflected largely the diel variation in each rate process and the heterogeneous distribution of adult females in the water column. Elevated nocturnal feeding activity of these copepods may be due to an endogenous rhythm. The daytime maximum in ammonium excretion and night-time maximum in egg production rate indicated approximate half-day and day time lags, respectively, after the intake of food until its conversion into dissolved excreta and released eggs.


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