Novel colour polymorphisms in a hybrid zone of Mandarina (Gastropoda: Pulmonata)

Chiba, Satoshi

doi:10.1111/j.1095-8312.1997.tb01797.x

Cited by 10 publications

(10 citation statements)

References 30 publications

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“…In Albinaria hippolyti, the hybrid zone between subspecies is not associated with any obvious environmental gradient, with coincident clines between shell, morphological, and allozyme characteristics (Schilthuizen et al 1999a). Interestingly, the hybrid zone in this species and others (Woodruff 1989;Chiba 1997;Schilthuizen et al 1999a) is associated with rare alleles and novel polymorphisms, a potential source of evolutionary novelty.…”

Section: Genetic Studies In Snails: Within Speciesmentioning

confidence: 82%

Land snails as a model to understand the role of history and selection in the origins of biodiversity

Davison

2002

Population Ecology

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It is nearly 100 years since the first studies on variation in the shell patterns of land snails. Subsequently, snails have come to play an important role in our understanding of natural selection in the wild. In particular, snails have been an ideal model to understand the roles of history and selection in the origins of diversity. More recently, many studies have investigated the molecular genetic variation within snails. It is clear that snails are unusual, because some genes may vary by 10%-30% within a species. This molecular variation affords an excellent opportunity to further understand the action of natural selection in shaping the present-day phenotypic diversity. In the first part of this review, I illustrate the distinction between the historical and selective interpretations using one of the best-studied species, Cepaea nemoralis, and the example of "area effects." In the second part, studies that have compared patterns of morphological and molecular variation (especially DNA) are examined.

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Section: Genetic Studies In Snails: Within Speciesmentioning

confidence: 82%

Land snails as a model to understand the role of history and selection in the origins of biodiversity

Davison

2002

Population Ecology

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“…However, differences in genital morphologies may not be an important factor in the reproductive isolation of Mandarina. For example, even though the size of the penis of M. chichijimana is no more than one-fifth that of M. mandarina, these species interbreed in the central areas of Chichijima (Chiba 1997). A large penis with an extremely thick basal portion distinguishes M. aureola from all other species on Hahajima, but it does not prevent hybridization with M. polita (Chiba 1993).…”

Section: Reproductive Isolationmentioning

confidence: 99%

Ecological diversity and speciation in land snails of the genus Mandarina from the Bonin Islands

Chiba

2002

Population Ecology

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Endemic land snails of the genus Mandarina of the oceanic Bonin Islands offer an example of habitat and character divergence among closely related species. The molecular phylogenies of Mandarina show that a divergence of arboreal, semiarboreal, and ground-dwelling species has occurred repeatedly in different times, areas, and lineages. Ecological diversification is suggested to be important for the coexistence of Mandarina species based on the facts that sympatric species are typically highly differentiated ecologically and morphologically, and that species occupying similar habitats do not coexist. The ecological diversification of Mandarina has occurred without much genetic divergence compared with that of its mainland relatives. This suggests that morphological and ecological diversifications are accelerated in depauperate environments where there are fewer competitors and predators. Although the details of the reproductive isolation mechanisms are not understood and further examination is needed, the rapid evolution of prezygotic isolation is the main cause of speciation in Mandarina. In particular, ecological diversification may be an effective barrier to gene exchange between two species. Because of incomplete postmating isolation and the lower genetic divergence among species of Mandarina, breakdowns of reproductive isolation have frequently occurred as a result of habitat change. It is important to estimate the effect of hybridization on species diversification in future studies.

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“…In plants, new species are known to have been produced from certain recombinant genotypes (Rieseberg et al . 1996), while in land snail hybrid zones, new colour morphs (Chiba 1997) and shell shapes (Goodfriend & Gould 1996) appear.…”

Section: Introductionmentioning

confidence: 99%

The ‘rare allele phenomenon’ in a ribosomal spacer

Hoekstra

Gittenberger

2001

Molecular Ecology

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We describe the increased frequency of a particular length variant of the internal transcribed spacer 1 (ITS-1) of the ribosomal DNA in a hybrid zone of the land snail Albinaria hippolyti. The phenomenon that normally rare alleles or other markers can increase in frequency in the centre of hybrid zones is not new. Under the term 'hybrizyme' or 'rare allele' phenomenon it has been recorded in many organisms and different genetic markers. However, this is the first time that it has been found in a multicopy locus. On the one hand, the pattern fits well with the view that purifying selection in hybrid populations works on many loci across the genome and should thus have its effect on many independent molecular markers. On the other hand, the results are puzzling, given that the multiple copies of rDNA are not expected to respond in unison. We suggest two possible explanations for these conflicting observations.

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Novel colour polymorphisms in a hybrid zone of Mandarina (Gastropoda: Pulmonata)

Cited by 10 publications

References 30 publications

Land snails as a model to understand the role of history and selection in the origins of biodiversity

Land snails as a model to understand the role of history and selection in the origins of biodiversity

Ecological diversity and speciation in land snails of the genus Mandarina from the Bonin Islands

The ‘rare allele phenomenon’ in a ribosomal spacer

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