Document Detail

Stochastic variation in food availability influences weight and age at maturity.
MedLine Citation:
PMID:  10666359     Owner:  NLM     Status:  MEDLINE    
Variation in mean food availability, and in the variance around the mean, affects the growth rate during development. Previous theoretical work on the influence of environmental quality or growth rates on the phenotypic traits age and size at maturation assumed that there is no variation in growth rate or food availability within a generation. We develop a stochastic dynamic programming (SDP) model of the foraging behaviour of aphidophagous syrphids, and use this model to predict when syrphids should pupate (mature) when average food availability changes, or varies stochastically, during development. The optimal strategy takes into account not only the availability of food, but also the timing of its availability. Food availability, when small, influences developmental time, but not weight at pupation. Food availability, when large, influences weight at pupation, but not developmental time. When the food supply is low, the optimal strategy adjusts the size at pupation downwards for stochastic as opposed to deterministic availability of food. The conclusions reinforce the need for life-history studies to consider state dependence and short-term variability in growth rates.
B Tenhumberg; A J Tyre; B Roitberg
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of theoretical biology     Volume:  202     ISSN:  0022-5193     ISO Abbreviation:  J. Theor. Biol.     Publication Date:  2000 Feb 
Date Detail:
Created Date:  2000-03-29     Completed Date:  2000-03-29     Revised Date:  2009-11-03    
Medline Journal Info:
Nlm Unique ID:  0376342     Medline TA:  J Theor Biol     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  257-72     Citation Subset:  IM    
Copyright Information:
Copyright 2000 Academic Press.
Department of Biological Sciences, Behavioural Ecology Research Group, Burnaby, BC, V5A 1S6, Canada. btenhumberg@waite.adelaide
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MeSH Terms
Aphids / growth & development*
Food Supply*
Models, Biological
Stochastic Processes

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