EVOLUTION IN EXTREME ENVIRONMENTS: REPLICATED PHENOTYPIC DIFFERENTIATION IN LIVEBEARING FISH INHABITING SULFIDIC SPRINGS
Identifieur interne : 000816 ( Main/Exploration ); précédent : 000815; suivant : 000817EVOLUTION IN EXTREME ENVIRONMENTS: REPLICATED PHENOTYPIC DIFFERENTIATION IN LIVEBEARING FISH INHABITING SULFIDIC SPRINGS
Auteurs : Michael Tobler [États-Unis] ; Maura Palacios [États-Unis] ; Lauren J. Chapman [Canada] ; Igor Mitrofanov [Canada] ; David Bierbach [Allemagne] ; Martin Plath [Allemagne] ; Lenin Arias-Rodriguez [Mexique] ; Francisco J. García De Le N [Mexique] ; Mariana Mateos [États-Unis]Source :
- Evolution [ 0014-3820 ] ; 2011-08.
English descriptors
- KwdEn :
Abstract
We investigated replicated ecological speciation in the livebearing fish Poecilia mexicana and P. sulphuraria (Poeciliidae), which inhabit freshwater habitats and have also colonized multiple sulfidic springs in southern Mexico. These springs exhibit extreme hypoxia and high concentrations of hydrogen sulfide, which is lethal to most metazoans. We used phylogenetic analyses to test whether springs were independently colonized, performed phenotypic assessments of body and gill morphology variation to identify convergent patterns of trait differentiation, and conducted an eco‐toxicological experiment to detect differences in sulfide tolerances among ecotypes. Our results indicate that sulfidic springs were colonized by three different lineages, two within P. mexicana and one representing P. sulphuraria. Colonization occurred earlier in P. sulphuraria, whereas invasion of sulfidic springs in P. mexicana was more recent, such that each population is more closely related to neighboring populations from adjacent nonsulfidic habitats. Sulfide spring fish also show divergence from nonsulfidic phenotypes and a phenotypic convergence toward larger heads, larger gills, and increased tolerance to H2S. Together with previous studies that indicated significant reproductive isolation between fish from sulfidic and nonsulfidic habitats, this study provides evidence for repeated ecological speciation in the independent sulfide spring populations of P. mexicana and P. sulphuraria.
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DOI: 10.1111/j.1558-5646.2011.01298.x
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These springs exhibit extreme hypoxia and high concentrations of hydrogen sulfide, which is lethal to most metazoans. We used phylogenetic analyses to test whether springs were independently colonized, performed phenotypic assessments of body and gill morphology variation to identify convergent patterns of trait differentiation, and conducted an eco‐toxicological experiment to detect differences in sulfide tolerances among ecotypes. Our results indicate that sulfidic springs were colonized by three different lineages, two within P. mexicana and one representing P. sulphuraria. Colonization occurred earlier in P. sulphuraria, whereas invasion of sulfidic springs in P. mexicana was more recent, such that each population is more closely related to neighboring populations from adjacent nonsulfidic habitats. Sulfide spring fish also show divergence from nonsulfidic phenotypes and a phenotypic convergence toward larger heads, larger gills, and increased tolerance to H2S. Together with previous studies that indicated significant reproductive isolation between fish from sulfidic and nonsulfidic habitats, this study provides evidence for repeated ecological speciation in the independent sulfide spring populations of P. mexicana and P. sulphuraria.</div></front></TEI><affiliations><list><country><li>Allemagne</li><li>Canada</li><li>Mexique</li><li>États-Unis</li></country><region><li>Oklahoma</li><li>Québec</li><li>Texas</li></region><settlement><li>Montréal</li></settlement><orgName><li>Université McGill</li></orgName></list><tree><country name="États-Unis"><region name="Oklahoma"><name sortKey="Tobler, Michael" sort="Tobler, Michael" uniqKey="Tobler M" first="Michael" last="Tobler">Michael Tobler</name></region><name sortKey="Mateos, Mariana" sort="Mateos, Mariana" uniqKey="Mateos M" first="Mariana" last="Mateos">Mariana Mateos</name><name sortKey="Palacios, Maura" sort="Palacios, Maura" uniqKey="Palacios M" first="Maura" last="Palacios">Maura Palacios</name><name sortKey="Tobler, Michael" sort="Tobler, Michael" uniqKey="Tobler M" first="Michael" last="Tobler">Michael Tobler</name></country><country name="Canada"><region name="Québec"><name sortKey="Chapman, Lauren J" sort="Chapman, Lauren J" uniqKey="Chapman L" first="Lauren J." last="Chapman">Lauren J. Chapman</name></region><name sortKey="Mitrofanov, Igor" sort="Mitrofanov, Igor" uniqKey="Mitrofanov I" first="Igor" last="Mitrofanov">Igor Mitrofanov</name></country><country name="Allemagne"><noRegion><name sortKey="Bierbach, David" sort="Bierbach, David" uniqKey="Bierbach D" first="David" last="Bierbach">David Bierbach</name></noRegion><name sortKey="Plath, Martin" sort="Plath, Martin" uniqKey="Plath M" first="Martin" last="Plath">Martin Plath</name></country><country name="Mexique"><noRegion><name sortKey="Arias Odriguez, Lenin" sort="Arias Odriguez, Lenin" uniqKey="Arias Odriguez L" first="Lenin" last="Arias-Rodriguez">Lenin Arias-Rodriguez</name></noRegion><name sortKey="Garcia De Le N, Francisco J" sort="Garcia De Le N, Francisco J" uniqKey="Garcia De Le N F" first="Francisco J." last="García De Le N">Francisco J. García De Le N</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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