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The evolution of al...
The evolution of alternative developmental pathways : footprints of selection on life-history traits in a butterfly
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- Aalberg Haugen, Inger M., 1980- (author)
- Stockholms universitet,Zoologiska institutionen
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- Berger, David (author)
- Uppsala universitet,Stockholms universitet,Zoologiska institutionen,Uppsala University, Sweden,Zooekologi
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- Gotthard, Karl (author)
- Stockholms universitet,Zoologiska institutionen
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(creator_code:org_t)
- 2012-05-16
- 2012
- English.
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In: Journal of Evolutionary Biology. - : Wiley. - 1010-061X .- 1420-9101. ; 25:7, s. 1377-1388
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Abstract
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- Developmental pathways may evolve to optimize alternative phenotypes across environments. However, the maintenance of such adaptive plasticity under relaxed selection has received little study. We compare the expression of life-history traits across two developmental pathways in two populations of the butterfly Pararge aegeria where both populations express a diapause pathway but one never expresses direct development in nature. In the population with ongoing selection on both pathways, the difference between pathways in development time and growth rate was larger, whereas the difference in body size was smaller compared with the population experiencing relaxed selection on one pathway. This indicates that relaxed selection on the direct pathway has allowed life-history traits to drift towards values associated with lower fitness when following this pathway. Relaxed selection on direct development was also associated with a higher degree of genetic variation for protandry expressed as within-family sexual dimorphism in growth rate. Genetic correlations for larval growth rate across sexes and pathways were generally positive, with the notable exception of correlation estimates that involved directly developing males of the population that experienced relaxed selection on this pathway. We conclude that relaxed selection on one developmental pathway appears to have partly disrupted the developmental regulation of life-history trait expression. This in turn suggests that ongoing selection may be responsible for maintaining adaptive developmental regulation along alternative developmental pathways in these populations.
Subject headings
- NATURVETENSKAP -- Biologi -- Ekologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Ecology (hsv//eng)
- NATURVETENSKAP -- Biologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences (hsv//eng)
Keyword
- developmental plasticity
- diapause
- direct development
- Lepidoptera
- Phenotypic plasticity
- relaxed selection
- seasonal polyphenism
- sexual dimorphism protandry
- voltinism
- zoologisk ekologi
- Animal Ecology
Publication and Content Type
- ref (subject category)
- art (subject category)
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