NDLI: Ontogenetic change in genetic variance in size depends on growth environment.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Dmitriew, C. Blows, M. W. Rowe, L.
Description	Country affiliation: Canada Author Affiliation: Dmitriew C ( Department of Ecology and Evolutionary Biology, University of Toronto, Toronto, Ontario M5S 3B2, Canada. c.dmitriew@utoronto.ca)
Abstract	Within populations, the amount of environmental and genetic variation present may differ greatly among traits measured at multiple times over ontogeny. Brief periods of food deprivation are often followed by a period of accelerated (compensatory) growth. Early laboratory studies likewise reported a contraction of genetic variance in size as maturation approached. However, studies of wild populations often contradict these laboratory results. One possibility is that environmentally imposed stress is exposing genetic variance not seen in the laboratory. We tested the effect of rearing environment (high or low food) on genetic variance in size traits measured at two ages in the ladybird beetle Harmonia axyridis. A substantial amount of genetic variance was present in all combinations of rearing environment by ontogenetic stage among males. The pattern of change in male variance in mass over ontogeny was of opposite sign in the two food treatments, which may reflect cryptic genetic variance that is apparent only under stress. The proportion of overall variance that was due to additive genetic effects was much lower in females than in males, which suggests that the underlying genetics of female growth trajectories differs from that males. Our experimental design afforded an initial exploration of the genetics of compensatory growth.
File Format	HTM / HTML
ISSN	00030147
Issue Number	6
Volume Number	175
e-ISSN	15375323
Journal	The American Naturalist
Language	English
Publisher	The University of Chicago Press
Publisher Date	2010-06-01
Publisher Place	United States
Access Restriction	Subscribed
Subject Keyword	Discipline Ecology Discipline Evolutionary Biology Beetles Growth & Development Body Size Genetics Environment Animals Female Genetic Variation Larva Male Models, Genetic Comparative Study Journal Article Research Support, Non-u.s. Gov't
Content Type	Text
Resource Type	Article
Subject	Ecology, Evolution, Behavior and Systematics

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