Genetic variation for shell traits in a direct-developing marine snail involved in a putative sympatric ecological speciation process

Populations of the marine gastropod Littorina saxatilis from exposed rocky shores of NW Spain provide one of the few putative cases of sympatric ecological speciation. Two ecotypes with large differences in shell morphology and strong assortative mating are living at different vertical levels of the...

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Published inEvolutionary ecology Vol. 21; no. 5; pp. 635 - 650
Main Authors Conde-Padín, Paula, Carvajal-Rodríguez, Antonio, Carballo, Mónica, Caballero, Armando, Rolán-Alvarez, Emilio
Format Journal Article
LanguageEnglish
Published London Dordrecht : Springer Netherlands 01.09.2007
Springer Nature B.V
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ISSN0269-7653
1573-8477
DOI10.1007/s10682-006-9142-8

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Abstract Populations of the marine gastropod Littorina saxatilis from exposed rocky shores of NW Spain provide one of the few putative cases of sympatric ecological speciation. Two ecotypes with large differences in shell morphology and strong assortative mating are living at different vertical levels of the shore separated by a few meters. It has been hypothesized that shell size is the main determinant for the reproductive isolation observed between the ecotypes, and that several shell shape traits are subject to divergent natural selection and are responsible for the adaptation of each ecotype to its respective habitat. Using embryos extracted from wild females we obtain estimates of genetic variation for shell size and shape and compare them with those from neutral molecular markers. Estimates of heritability are significantly larger for the ecotype found in the upper shore than for that in the lower shore, in concordance with a similar result observed for heterozygosity of neutral markers. The large genetic differentiation between ecotypes for the shell traits, contrasting the smaller close to neutral differentiation between populations of the same ecotype, supports the implication of the traits in adaptation.
AbstractList Populations of the marine gastropod Littorina saxatilis from exposed rocky shores of NW Spain provide one of the few putative cases of sympatric ecological speciation. Two ecotypes with large differences in shell morphology and strong assortative mating are living at different vertical levels of the shore separated by a few meters. It has been hypothesized that shell size is the main determinant for the reproductive isolation observed between the ecotypes, and that several shell shape traits are subject to divergent natural selection and are responsible for the adaptation of each ecotype to its respective habitat. Using embryos extracted from wild females we obtain estimates of genetic variation for shell size and shape and compare them with those from neutral molecular markers. Estimates of heritability are significantly larger for the ecotype found in the upper shore than for that in the lower shore, in concordance with a similar result observed for heterozygosity of neutral markers. The large genetic differentiation between ecotypes for the shell traits, contrasting the smaller close to neutral differentiation between populations of the same ecotype, supports the implication of the traits in adaptation.[PUBLICATION ABSTRACT]
Populations of the marine gastropod Littorina saxatilis from exposed rocky shores of NW Spain provide one of the few putative cases of sympatric ecological speciation. Two ecotypes with large differences in shell morphology and strong assortative mating are living at different vertical levels of the shore separated by a few meters. It has been hypothesized that shell size is the main determinant for the reproductive isolation observed between the ecotypes, and that several shell shape traits are subject to divergent natural selection and are responsible for the adaptation of each ecotype to its respective habitat. Using embryos extracted from wild females we obtain estimates of genetic variation for shell size and shape and compare them with those from neutral molecular markers. Estimates of heritability are significantly larger for the ecotype found in the upper shore than for that in the lower shore, in concordance with a similar result observed for heterozygosity of neutral markers. The large genetic differentiation between ecotypes for the shell traits, contrasting the smaller close to neutral differentiation between populations of the same ecotype, supports the implication of the traits in adaptation.
Author Conde-Padín, Paula
Carballo, Mónica
Caballero, Armando
Rolán-Alvarez, Emilio
Carvajal-Rodríguez, Antonio
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  fullname: Rolán-Alvarez, Emilio
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Snippet Populations of the marine gastropod Littorina saxatilis from exposed rocky shores of NW Spain provide one of the few putative cases of sympatric ecological...
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SubjectTerms assortative mating
Ecotypes
Evolution
females
Gastropoda
Genetic differentiation·Geometric morphometrics
Genetic diversity
genetic markers
genetic variation
Genetics
habitats
heritability
heterozygosity
Hybrid zone
Littorina
Littorina saxatilis
natural selection
phenotypic plasticity
reproductive isolation
snails
Spain
Speciation
Title Genetic variation for shell traits in a direct-developing marine snail involved in a putative sympatric ecological speciation process
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