Plasticity and heritability of morphological variation within and between parapatric stickleback demes

Journal of Evolutionary Biology
R J Scott McCairns, Louis Bernatchez

Abstract

The threespine stickleback (Gasterosteus aculeatus) has emerged as an important model organism in evolutionary ecology, largely due to the repeated, parallel evolution of divergent morphotypes found in populations having colonized freshwater habitats. However, morphological divergence following colonization is not a universal phenomenon. We explore this in a large-scale estuarine ecosystem inhabited by two parapatric stickleback demes, each physiologically adapted to divergent osmoregulatory environments (fresh vs. saline waters). Using geometric morphometric analyses of wild-caught individuals, we detected significant differences between demes, in addition to sexual dimorphism, in body shape. However, rearing full-sib families from each deme under controlled, reciprocal salinity conditions revealed no differences between genotypes and highly significant environmental effects. It is also noteworthy that fish from both demes were fully plated, whether found in the wild or reared under reciprocal salinity conditions. Although we found significant heritability for body shape, we also noted significant direct environmental effects for many latent shape variables. Moreover, we found little evidence for diversifying selection acting ...Continue Reading

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Jul 19, 2013·Journal of Evolutionary Biology·J Defaveri, J Merilä
Apr 25, 2013·Molecular Ecology·Rose L AndrewLoren H Rieseberg
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Dec 2, 2020·Nature Ecology & Evolution·Isabel S MagalhaesAndrew D C MacColl
Aug 22, 2021·Scientific Reports·Stefanos FragkoulisGeorge Koumoundouros

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