Polytypic chromosomal variation  in Triturus boscai  (Urodela : Salamandridae)

Herrero, Pilar

doi:10.1051/gse:19910401

Cited by 4 publications

(5 citation statements)

References 6 publications

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“…For example, Arntzen et al () found clear signs of asymmetric viability of reciprocal‐cross hybrids between Triturus cristatus (crested) and T. marmoratus (marbled) newts that likely resulted from an incompatibility between the crested X chromosome and marbled cytoplasm, as adult F1 hybrids resulting from marbled‐female versus crested‐male crosses consisted entirely of males. Herrero () reported the formation of sterile hybrids of L. boscai resulting from crosses between two groups of populations differentiated by C‐band chromosomal patterns. According to this author, the occurrence of sterile hybrids derived from abnormalities during meiosis.…”

Section: Discussionmentioning

confidence: 99%

“…According to this author, the occurrence of sterile hybrids derived from abnormalities during meiosis. Considering that all L. boscai populations studied by Herrero () belong to the LBSE lineage (Martínez‐Solano et al, ; Teixeira et al, ), evidence of this intraspecific post‐zygotic reproductive barrier is somewhat intriguing in light of the successful experimental hybridization between L. boscai and other closely related newts (Bucci‐Innocenti, Ragghianti, & Mancino, ). Whereas asymmetry in backcrosses and in the distribution of mtDNA lineages could be explained by the action of pre‐ and post‐zygotic mechanisms, further field studies on population sex ratios and common garden experiments comparing the survival of parental lineages, hybrids and backcrosses in both directions are required to test these alternative but not mutually exclusive hypotheses.…”

Section: Discussionmentioning

confidence: 99%

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Discordant patterns of introgression across a narrow hybrid zone between two cryptic lineages of an Iberian endemic newt

Sequeira

Bessa-Silva

Tarroso

et al. 2019

J of Evolutionary Biology

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The study of natural hybrid zones can illuminate aspects of lineage divergence and speciation in morphologically cryptic taxa. We studied a hybrid zone between two highly divergent but morphologically similar lineages (south-western and southeastern) of the Iberian endemic Bosca's newt (Lissotriton boscai) in SW Iberia with a multilocus dataset (microsatellites, nuclear and mitochondrial genes). STRUCTURE and NEWHYBRIDS analyses retrieved few admixed individuals, which classified as backcrosses involving parental individuals of the south-western lineage. Our results show asymmetric introgression of mtDNA beyond the contact from this lineage into the south-eastern lineage. Analysis of nongeographic introgression patterns revealed asymmetries in the direction of introgression, but except for mtDNA, we did not find evidence for nonconcordant introgression patterns across nuclear loci. Analysis of a 150-km transect across the hybrid zone showed broadly coincident cline widths (ca. 3.2-27.9 km), and concordant cline centres across all markers, except for mtDNA that is displaced ca. 60 km northward. Results from ecological niche modelling show that the hybrid zone is in a climatically homogenous area with suitable habitat for the species, suggesting that contact between the two lineages is unlikely to occur further south as their distributions are currently separated by an extensive area of unfavourable habitat. Taken together, our findings suggest the genetic structure of this hybrid zone results from the interplay of historical (biogeographic) and populationlevel processes. The narrowness and coincidence of genetic clines can be explained by weak selection against hybrids and reflect a degree of reproductive isolation that is consistent with cryptic speciation. K E Y W O R D Samphibians, cline analysis, contact zone, cryptic speciation, introgression | 203 SEQUEIRA Et Al.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Discordant patterns of introgression across a narrow hybrid zone between two cryptic lineages of an Iberian endemic newt

Sequeira

Bessa-Silva

Tarroso

et al. 2019

J of Evolutionary Biology

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“…However, more sampling in (possible) transition zones and the study of nuclear genes and morphology seems required, prior to any new arrangement. The distinct clade found by Herrero (1991) also deserves further attention. Quoting Martínez-Solano et al (2006): "(…) new data from independent sources are needed to clarify the taxonomic status of these two divergent lineages, and morphological and molecular studies including data on variation in nuclear markers will be particularly helpful in this respect.…”

Section: Caudata or Urodelamentioning

confidence: 90%

A tentative species list of the European herpetofauna (Amphibia and Reptilia) — an update

Speybroeck

Beukema

Crochet

2010

Zootaxa

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“…As another plausible scenario, individuals might disperse but fail to reproduce or exhibit asymmetrical reproductive success in occupied areas due to sexual selection (Aragón et al, 2000;Gabor et al, 2000;Babik et al, 2003) or genetic barriers (e.g. Herrero, 1991). These alternative but not mutually exclusive hypotheses have yet to be empirically tested with further field and laboratory experiments, explicitly taking into account the historical, ecological and geographical contexts in which the processes are taking place, i.e.…”

Section: Nuclear Dna Phylogeography Of Lissotriton Boscaimentioning

confidence: 99%

Genealogy of the nuclear β-fibrinogen intron 7 in Lissotriton boscai (Caudata, Salamandridae): concordance with mtDNA and implications for phylogeography and speciation

Teixeira

Martínez‐Solano

Buckley

et al. 2015

CTOZ

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The power of phylogeographic inference resides in its ability to integrate information from multiple sources in an iterative hypothesis-testing framework. In this paper, we build upon previous mtDNA-based hypotheses about the evolutionary history of the Iberian newt Lissotriton boscai using sequences of the highly variable nuclear β-fibrinogen intron 7. In addition to the nuclear sequences, we produced new mtDNA data across the species range to delineate contact zones and test the congruence between nuclear and mitochondrial datasets at the same level of spatial organization. Through a combination of phylogenetic, phylogeographic continuous diffusion, and genetic landscape modelling analyses, we infer the evolutionary history of the species. We found notable congruence between nuclear and mtDNA datasets, which confirms deep and consistent differentiation between two major lineages that originated in the Miocene. Additionally, we found a new nuclear haplogroup with no mtDNA counterpart, roughly circumscribed to the Iberian Sistema Central mountains, and extensive areas of nuclear admixture across mtDNA lineages. We describe potential historical dispersal routes from an ancestral hypothetical refugium in the western end of the Sistema Central in central Portugal and highlight how deep phylogeographic breaks do not necessarily indicate cryptic speciation events.

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Polytypic chromosomal variation in Triturus boscai (Urodela : Salamandridae)

Cited by 4 publications

References 6 publications

Discordant patterns of introgression across a narrow hybrid zone between two cryptic lineages of an Iberian endemic newt

Discordant patterns of introgression across a narrow hybrid zone between two cryptic lineages of an Iberian endemic newt

A tentative species list of the European herpetofauna (Amphibia and Reptilia) — an update

Genealogy of the nuclear β-fibrinogen intron 7 in Lissotriton boscai (Caudata, Salamandridae): concordance with mtDNA and implications for phylogeography and speciation

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