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ICES Journal of Marine Science, 57: 18251833. 2000 doi:10.1006/jmsc.2000.0976, available online at http://www.idealibrary.com on
 

Summary: ICES Journal of Marine Science, 57: 18251833. 2000
doi:10.1006/jmsc.2000.0976, available online at http://www.idealibrary.com on
The adaptive timing of diapause a search for evolutionarily
robust strategies in Calanus finmarchicus
. Fiksen
Fiksen, . 2000. The adaptive timing of diapause a search for evolutionarily robust
strategies in Calanus finmarchicus. ICES Journal of Marine Science, 57: 18251833.
In environments with strong and variable seasonal fluctuations, organisms are selected
on the basis of their phenology, such as the timing of diapause, reproduction, or
assembling of storage products. A simulation model of the dynamic balance of various
phenologies within a population facing density-dependence and varying annual,
environmentally determined growth opportunities is presented. The main assumption
is that the timing of phenological events is heritable and cued by a single signal (day
length). Then, the balance between alternative strategies is regulated by natural
selection and reproductive success. The model is developed for the marine copepod
Calanus finmarchicus, which must decide when to start preparing for diapause by
allocating to storage rather than somatic growth, how much storage (lipids) to bring
with it during wintering and when to ``wake up'' to complete development and to
reproduce. The results show that (1) density-dependence may lead to frequency-
dependent resting and emergence strategies, (2) environmental stochasticity causes

  

Source: Aksnes, Dag L. - Institutt for biologi, Universitetet i Bergen

 

Collections: Environmental Sciences and Ecology; Biology and Medicine