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Title of Journal: Oecologia

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Abbravation: Oecologia

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Springer Berlin Heidelberg

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DOI

10.1007/bf00957539

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1432-1939

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Summer dormancy as a refuge from mortality in the

Authors: T Callaghan R Karlson
Publish Date: 2002/06/01
Volume: 132, Issue: 1, Pages: 51-59
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Abstract

In expanding populations individuals that produce dormant offspring when conditions are otherwise suitable for growth and reproduction incur a cost since the dormant life stage delays reproduction These individuals are at a disadvantage unless 1 there is not enough time for reproduction to occur before the environment degrades or 2 the probability of death in the nondormant state is high Here we investigate resting stages of the freshwater bryozoan Plumatella emarginata to test the prediction that delayed emergence from dormancy can be related to seasonal fluctuations in mortality Our results show that emergence in late spring and summer occurs at much lower frequencies than in early spring and is strongly associated with high mortality at least in part due to predation We document significant reductions in the growth and survival of plumatellid colonies during the summer in the presence of the crayfish Orconectes limosus Thus summer dormancy provides a significant refuge from predation Dormant resting stages during the winter also experience significant mortality Our results are consistent with the general notions that 1 the proportion of colonies emerging from dormancy reflects tradeoffs in the relative risks of mortality in dormant versus nondormant states and 2 temporal shifts in the risk of mortality influence the timing of lifecycle transitions

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