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JOURNAL OF PLANKTON RESEARCH | VOLUME 18 | NUMBER 6 | PAGES 1033-1040 | 1996
© Oxford University Press

research-article

Is fecundity modified by crowding in the copepod Centropages typicus?

A. Miralto, A. Ianora, S.A. Poulet1, G. Romano and M. Laabir1

Stazione Zoologica ‘A. Dohrn’ Villa Comunale, I-80121 Naples, Italy 1Station Biologique CNRS, F-29682 Roscoff, France

Received on November 21, 1995; accepted on February 2, 1996 Experiments were conducted to test the effect of overcrowding on egg production rates in the copepod Centropages typicus. Fertility was not significantly reduced by the presence of other conspecifics when the volume of water was the same for females incubated alone or in the presence of other females and males. There was no evidence of chemical cues affecting egg production when females were kept in large (1 female in 100 ml sea water [SW] or small (1 female in 25 ml SW) volumes of water, with or without partitions, and in the presence or absence of food or males. Also, spawning rate was not reduced when females were incubated in flow-through experimental chambers which allowed diffusion of pheromones between females incubated alone or in high densities (100 ind. in 50 ml SW). Only when females were placed at unnaturally high densities (1 female ml–1) was egg production significantly reduced, probably due to physical disturbance and increased number of collisions rather than chemical communication among individuals. The results show that chemical cues do not affect spawning behaviour when population densities are close to field conditions. By contrast, overcrowding induced by swarming or aggregation may potentially limit reproductive success due to reduced feeding, and production and cannibalism of eggs.


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 J PLANKTON RESHome page
J. T. Turner, A. Ianora, F. Esposito, Y. Carotenuto, and A. Miralto
Zooplankton feeding ecology: does a diet of Phaeocystis support good copepod grazing, survival, egg production and egg hatching success?
J. Plankton Res., November 1, 2002; 24(11): 1185 - 1195.
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