Disassociation between weak sexual isolation and genetic divergence in a hermaphroditic land snail and implications about chirality

Giokas, Sinos; Mylonas, M.; Rolán‐Alvarez, Emilio

doi:10.1111/j.1420-9101.2006.01115.x

Cited by 11 publications

(10 citation statements)

References 101 publications

(214 reference statements)

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“…Albinaria is a highly speciose genus with more than 200 taxa distributed in Greece [83], whereas Codringtonia is an endemic land-snail genus with six species distributed in mainland Greece [84]. At the same time premating isolation mechanisms are in effect non-existent in Albinaria , thus hybrids are very frequent [85]. On the other hand, hybridization has not been reported in Codringtonia .…”

Section: Discussionmentioning

confidence: 99%

Animal Mitochondria, Positive Selection and Cyto-Nuclear Coevolution: Insights from Pulmonates

2013

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Pulmonate snails have remarkably high levels of mtDNA polymorphism within species and divergence between species, making them an interesting group for the study of mutation and selection on mitochondrial genomes. The availability of sequence data from most major lineages – collected largely for studies of phylogeography - provides an opportunity to perform several tests of selection that may provide general insights into the evolutionary forces that have produced this unusual pattern. Several protein coding mtDNA datasets of pulmonates were analyzed towards this direction. Two different methods for the detection of positive selection were used, one based on phylogeny, and the other on the McDonald-Kreitman test. The cyto-nuclear coevolution hypothesis, often implicated to account for the high levels of mtDNA divergence of some organisms, was also addressed by assessing the divergence pattern exhibited by a nuclear gene. The McDonald-Kreitman test indicated multiple signs of positive selection in the mtDNA genes, but was significantly biased when sequence divergence was high. The phylogenetic method identified five mtDNA datasets as affected by positive selection. In the nuclear gene, the McDonald-Kreitman test provided no significant results, whereas the phylogenetic method identified positive selection as likely present. Overall, our findings indicate that: 1) slim support for the cyto-nuclear coevolution hypothesis is present, 2) the elevated rates of mtDNA polymorphims and divergence in pulmonates do not appear to be due to pervasive positive selection, 3) more stringent tests show that spurious positive selection is uncovered when distant taxa are compared and 4) there are significant examples of positive selection acting in some cases, so it appears that mtDNA evolution in pulmonates can escape from strict deleterious evolution suggested by the Muller’s ratchet effect.

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Section: Discussionmentioning

confidence: 99%

Animal Mitochondria, Positive Selection and Cyto-Nuclear Coevolution: Insights from Pulmonates

2013

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“…flat keeled versus globular) mated and produced viable offspring (Rensch, ), and that the different populations had similar genitalia (Fiorentino et al ., ). Furthermore, neither substantial sexual isolation barriers nor genital differentiation were found between Albinaria species (Schilthuizen & Lombaerts, ; Giokas, Mylonas & Rolán‐Alvarez, ).…”

Section: Discussionmentioning

confidence: 97%

Genetic and morphological studies of species status for poorly known endemicTrochulus phorochaetius(Bourguignat, 1864) (Gastropoda: Pulmonata: Hygromiidae), and its comparison with closely related taxa

Proćków¹,

Mackiewicz

Pieńkowska

2013

Zool J Linn Soc

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The taxonomic status of Trochulus phorochaetius and its phylogenetic relationships to Trochulus plebeius and Trochulus hispidus were evaluated based on molecular, morphological, and genital anatomy data. The canonical discriminant analysis (CDA) of shell morphology allowed the clear differentiation between these three nominal species, whereas the genitalia revealed their high similarity. Analyses of cytochrome c oxidase subunit I (COI) sequences were not always congruent with the differentiation between these three species by shell characters. None of them formed a monophyletic group covering all its sequences. Instead, many sequences obtained from individuals classified to the same morphospecies, and/or usually collected from the same region or country, created highly supported separate clades and delimited clusters. Three distinct clades containing sequences of two morphospecies originating from the same country were identified in molecular phylogenetic and species delimitation studies: (1) T. plebeius + T. hispidus from Great Britain; (2) T. plebeius + T. hispidus from Poland; and (3) T. phorochaetius + T. hispidus from France. In the latter case some of the sequences were even identical. Their genetic similarity could indicate the ability to hybridize, which may be evidenced by the lack of major differences in their reproductive system. The assignment of distinctive morphospecies, and thus existing taxonomic names, to genetically defined evolutionary lineages is premature and arbitrary to some extent at this stage. © 2013 The Linnean Society of London

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“…Whereas chirality might have a significant effect on gene flow between taxa with partial postzygotic isolation (as between different species of the P. suturalis complex), it is unlikely to initiate divergence (Johnson et al, 1987) or even to maintain existing differences that accumulated in allopatry as in the Alopia case. Nevertheless, it has been discussed that assortative mating of enantiomorphic taxa resulted in reproductive character displacement, that is, a boost of prezygotic reproductive isolation, in some cases where dextral and sinistral species of door snails co-occur (Giokas, Mylonas, & Rol an-Alvarez, 2006; Uit de Weerd, Groenenberg, Schilthuizen, & Gittenberger, 2006; but see Kornilios, Stamataki, & Giokas, 2015). This is only likely if stronger reproductive isolation evolved already during the differentiation of these taxa in allopatry than in the case of A. livida and A. straminicollis.…”

Section: Impact Of Chirality On Differentiationmentioning

confidence: 99%

High gene flow despite opposite chirality in hybrid zones between enantiomorphic door snails

et al. 2017

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We studied differentiation and geneflow patterns between enantiomorphic door-snail species in two hybrid zones in the Bucegi Mountains (Romania) to investigate the effects of intrinsic barriers (complications in copulation) and extrinsic selection by environmental factors. A mitochondrial gene tree confirmed the historical separation of the examined populations into the dextral Alopia livida and the sinistral Alopia straminicollis in accordance with the morphological classification, but also indicated gene flow between the species. By contrast, a network based on amplified fragment length polymorphisms (AFLP) markers revealed local groups of populations as units independent of their species affiliation. Admixture analyses based on AFLP data showed that the genomes of most individuals in the hybrid zones are composed of parts of the genomes of both parental taxa. The introgression patterns of a notable fraction of the examined markers deviated from neutral introgression. However, the patterns of most non-neutral markers were not concordant between the two hybrid zones. There was also no concordance between non-neutral markers in the two genomic clines and markers that were correlated with environmental variables or markers that were correlated with the proportion of dextral individuals in the populations. Neither extrinsic selection by environmental factors nor intrinsic barriers resulting from positive frequency-dependent selection of the prevailing coiling direction were sufficient to maintain the distinctness of A. straminicollis and A. livida. Despite being historically separated units, we conclude that these taxa now merge where they come into contact.

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Disassociation between weak sexual isolation and genetic divergence in a hermaphroditic land snail and implications about chirality

Cited by 11 publications

References 101 publications

Animal Mitochondria, Positive Selection and Cyto-Nuclear Coevolution: Insights from Pulmonates

Animal Mitochondria, Positive Selection and Cyto-Nuclear Coevolution: Insights from Pulmonates

Genetic and morphological studies of species status for poorly known endemicTrochulus phorochaetius(Bourguignat, 1864) (Gastropoda: Pulmonata: Hygromiidae), and its comparison with closely related taxa

High gene flow despite opposite chirality in hybrid zones between enantiomorphic door snails

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