JOURNAL OF PLANKTON RESEARCH | VOLUME 16 | NUMBER 10 | PAGES 1329-1351 | 1994
© Oxford University Press
research-article |
Egg production, growth and development of the cyclopoid copepod Oithona similis
Danish Institute for Fisheries and Marine Research Charlottenlund Castle, DK-2920 Charlottenlund, Denmark
Received on February 10, 1994; accepted on May 20, 1994
Egg production, growth and development rates of Oithona similis were measured in the laboratory as a function of food concentration and composition. On an optimum diet, development is isochronal and growth is near exponential. The maximum juvenile growth rate at 15°C (0.2 day–1) is similar to juvenile growth in calanoid copepods. The maximum weight-specific egg production rate (0.1 day–1), on the other hand, is substantially less than in free-spawning calanoids, but similar to that in egg-carrying calanoids. In the Kattegat, Oithona spp. egg production is strongly limited by food during summer and controlled by temperature during winter. The seasonal signal in fecundity and population biomass is much weaker than in the co-occurring free-spawning calanoid genera, where fecundity and population biomass undergo dramatic seasonal viaration.
1Present address: Instituto Nacional de Investigaciòn y Desarrollo Pesquero, INIDEP, CC 175, Playa Grande, Mar del Plata, Argentina
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