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JOURNAL OF PLANKTON RESEARCH | VOLUME 11 | NUMBER 3 | PAGES 487-502 | 1989
© Oxford University Press

research-article

Instar-dependent mortality rates of coexisting Daphnia species in Lake Vechten, The Netherlands

Wouter Hovenkamp

Limnological Institute Rijksstraatweg 6, Nieuwersluis 3631 AC, The Netherlands

Received on March 29, 1988; accepted on January 31, 1989 In Lake Vechten, population parameters were determined for two coexisting Daphnia species, D.hyalina and D.cucullata, from April 23 to December 10, 1986. Daphnia hyalina is dominant in spring and D.cucullata in summer and autumn. Size frequency distributions were converted into instar frequency distributions by using experimental growth curves and field measurements on newborn size and the size at first reproduction. A discrete event computer model was used to calculate the instar mortality rates. Relative importances of instar mortality rates for the population mortality rate were calculated and discussed. The mortality of the juvenile stages was found to be more important than adult mortality during most of the sampling season, despite egg mortality when egg-bearing females are killed. Only in September and October was the mortality of adult instars more important. Correlation coefficients between differences in the rates of increase and differences in mean brood size and instar mortalities show that the former are caused mainly by differences in juvenile mortality, the main factor determining the replacement of D.hyalina by D.cucullata during early summer.


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S. Hulsmann and W. Weiler
Adult, not juvenile mortality as a major reason for the midsummer decline of a Daphnia population
J. Plankton Res., January 1, 2000; 22(1): 151 - 168.
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