Historical and ecological correlates of body shape in the brook stickleback, Culaea inconstans
Identifieur interne : 000592 ( Main/Exploration ); précédent : 000591; suivant : 000593Historical and ecological correlates of body shape in the brook stickleback, Culaea inconstans
Auteurs : Jessica Lyn Ward [Canada] ; Deborah Ann Mclennan [Canada]Source :
- Biological Journal of the Linnean Society [ 0024-4066 ] ; 2009-04.
English descriptors
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Abstract
Using geometric morphometric methods, we evaluated the correlation between phenotypic variation and available historical and habitat information for two genetically differentiated, allopatric lineages of a widespread North American species, the brook stickleback (Culaea inconstans). The results obtained revealed strong patterns of structured phenotypic differentiation across the species range with extreme phenotypes occurring at the northwest and southeast range boundaries. Shape variation was broadly congruent with the distribution of two mitochondrial DNA lineages; a deep‐bodied eastern form (Atlantic refugium) and a slim‐bodied western form (Mississippian refugium); however, the two forms were not lineage‐specific and phenotypic cladistic diversification is likely to be an artefact of underlying clinal variation associated with longitudinal and latitudinal gradients. In addition, we found little evidence of diagnosable lake and river forms across North America. Taken together, large‐scale patterns of phenotypic diversity observed in C. inconstans suggest that relatively recent factors, such as continually varying natural selection across the range and/or potential local gene flow, may substantially mitigate the effects of historical separation or a generalized adaptive response to alternative habitats. © 2009 The Linnean Society of London, Biological Journal of the Linnean Society, 2009, 96, 769–783.
Url:
DOI: 10.1111/j.1095-8312.2008.01180.x
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The results obtained revealed strong patterns of structured phenotypic differentiation across the species range with extreme phenotypes occurring at the northwest and southeast range boundaries. Shape variation was broadly congruent with the distribution of two mitochondrial DNA lineages; a deep‐bodied eastern form (Atlantic refugium) and a slim‐bodied western form (Mississippian refugium); however, the two forms were not lineage‐specific and phenotypic cladistic diversification is likely to be an artefact of underlying clinal variation associated with longitudinal and latitudinal gradients. In addition, we found little evidence of diagnosable lake and river forms across North America. Taken together, large‐scale patterns of phenotypic diversity observed in C. inconstans suggest that relatively recent factors, such as continually varying natural selection across the range and/or potential local gene flow, may substantially mitigate the effects of historical separation or a generalized adaptive response to alternative habitats. © 2009 The Linnean Society of London, Biological Journal of the Linnean Society, 2009, 96, 769–783.</div></front></TEI><affiliations><list><country><li>Canada</li></country><region><li>Ontario</li></region><settlement><li>Toronto</li></settlement><orgName><li>Université de Toronto</li></orgName></list><tree><country name="Canada"><region name="Ontario"><name sortKey="Ward, Jessica Lyn" sort="Ward, Jessica Lyn" uniqKey="Ward J" first="Jessica Lyn" last="Ward">Jessica Lyn Ward</name></region><name sortKey="Mclennan, Deborah Ann" sort="Mclennan, Deborah Ann" uniqKey="Mclennan D" first="Deborah Ann" last="Mclennan">Deborah Ann Mclennan</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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