Population cytogenetics of the "Northern Mod 1" chromosomal race of Liolaemus monticola Müller &amp; Helmich (Iguanidae) from Central Chile

Lamborot, Madeleine; Ossa, Carmen Gloria; Vasquez, Mauricio

doi:10.4067/s0717-65382012000200002

Cited by 7 publications

(13 citation statements)

References 23 publications

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“…A number of studies have been performed on chromosomes, coloration, diet, thermoregulation, and geometric morphometrics which have provided evidence for clinal variation of lizards in Chile (Lamborot 1991;Lamborot et al 2012;Vásquez et al 2007;Vidal et al 2007;Sepúlveda et al 2008;Fariña et al 2008;. In spite of these evidences, our results do not show clinal variation in head shape among the five studied localities of M. atacamensis.…”

Section: Discussioncontrasting

confidence: 56%

Geometric morphometric analysis of the head of Microlophus atacamensis (Tropiduridae) in a latitudinal gradient

et al. 2015

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Background: Clinal variation is defined as gradual variation in a character associated with geographic distance among sites. Microlophus atacamensis is a medium large lizard species which inhabits the intertidal zone of northern Chile, distributed from Antofagasta (23°39′ S) to Arrayán, La Serena (29°41′ S) in a gradient which could show clinal variation. Geometric morphometrics analyzes differences in shape independent of size; information about shape allows a more complete biological interpretation than information on morphological variation. This study evaluated clinal variation in the head shape of M. atacamensis from five localities (Antofagasta, Paposo, Pan de Azúcar, Caldera, and Tres Playitas) using dorsal and lateral views, comparing form variation with latitudinal distribution. The heads of adults collected were photographed in lateral and dorsal views. Results: The analysis did not find significant differences in form among the five localities, in contrast to the proposal of earlier studies, and no differences were recorded between the sexes. Possible reasons why these populations are not differentiated in the latitudinal gradient are discussed. Conclusions: Our results show that there are no differences between the studied, among the explanations are that populations of this species are subjected to similar environments that promote convergence of the structures analyzed.

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Section: Discussioncontrasting

confidence: 56%

Geometric morphometric analysis of the head of Microlophus atacamensis (Tropiduridae) in a latitudinal gradient

et al. 2015

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“…Data on recombination patterns in reptiles remain scarce. Most studies used chiasma counts and distribution at diakinesis-metaphase I ( Cobror et al 1986 , Lamborot et al 2012 , Reed et al 1992 ). However, the resolution of chiasmata analysis is rather poor, because the chromosomes at metaphase I are condensed, making precise chiasmata localization along the chromosome difficult.…”

Section: Introductionmentioning

confidence: 99%

Immunocytological analysis of meiotic recombination in two anole lizards (Squamata, Dactyloidae)

Lisachov

Trifonov

Giovannotti³

et al. 2017

CCG

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Although the evolutionary importance of meiotic recombination is not disputed, the significance of interspecies differences in the recombination rates and recombination landscapes remains under-appreciated. Recombination rates and distribution of chiasmata have been examined cytologically in many mammalian species, whereas data on other vertebrates are scarce. Immunolocalization of the protein of the synaptonemal complex (SYCP3), centromere proteins and the mismatch-repair protein MLH1 was used, which is associated with the most common type of recombination nodules, to analyze the pattern of meiotic recombination in the male of two species of iguanian lizards, Anolis carolinensis Voigt, 1832 and Deiroptyx coelestinus (Cope, 1862). These species are separated by a relatively long evolutionary history although they retain the ancestral iguanian karyotype. In both species similar and extremely uneven distributions of MLH1 foci along the macrochromosome bivalents were detected: approximately 90% of crossovers were located at the distal 20% of the chromosome arm length. Almost total suppression of recombination in the intermediate and proximal regions of the chromosome arms contradicts the hypothesis that “homogenous recombination” is responsible for the low variation in GC content across the anole genome. It also leads to strong linkage disequilibrium between the genes located in these regions, which may benefit conservation of co-adaptive gene arrays responsible for the ecological adaptations of the anoles.

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“…A previous study reported at least four major lineages allowing to infer strong phylogeographic structure within L. nigroviridis [27]; therefore, an increase taxon sampling seems recommendable to determine the position of the new proposed taxon (L. uniformis) related to its sister species (L. nigroviridis). The second model, L. monticola, is a saxicolous lizard species from the mediterranean Andes [32,33] and the Coast Range [34] in central Chile from between 600 m to 1900 m. This species displays an extensive variation and complexity in chromosome number in a latitudinal gradient [35,36], with riverine barriers playing a major role in the divergence of populations [37,38]. Phylogenetic inferences show that L. nitidus is sister to L. monticola [3,39].…”

Section: Introductionmentioning

confidence: 99%

Molecular phylogenetic analyses reveal the importance of taxon sampling in cryptic diversity: Liolaemus nigroviridis and L. monticola (Liolaeminae) as focal species

Torres-Pérez

Boric-Bargetto

Rodríguez-Valenzuela

et al. 2017

Rev. Chil. de Hist. Nat.

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Background: Mitochondrial markers are widely used as a first approach in determining evolutionary relationships among vertebrate taxa at different hierarchical scales. Cytochrome b and cytochrome oxidase I are among the most common markers; they are particularly useful in phylogeography and species delineation studies. Simulation and empirical studies show that increasing the taxon sampling has a clear and strong effect on the accuracy of the inferred trees and therefore on hypothesized phylogenetic relationships (and eventually in new taxonomic rearrangements); this should be considered in the design of studies. The lizard genus Liolaemus is widely distributed in southern South America and includes more than 250 described species. The number of taxa and the distribution of Liolaemus species/populations makes them a good model for testing different hypotheses in systematics. Methods: We studied two Liolaemus species, Liolaemus nigroviridis and L. monticola as focal species to evaluate their monophyly and the influence of adding new samples from related taxa in the resulting phylogenies. We performed phylogenetic analyses (maximum likelihood and Bayesian inference) using 141 sequences of the mitochondrial DNA Cytochrome b (cyt-b) of 11 Liolaemus species. Results: Our study show that using intensive taxon sampling for phylogenetic reconstructions, two species (L. uniformis and L. nitidus) are placed within the clades of the two focal species (L. nigroviridis and L. monticola, respectively). Conclusions: Our study confirms the importance of taxon sampling to infer more accurate phylogenetic relationships, particularly to reveal hidden polyphyly or paraphyly, which may have a strong impact on taxonomic proposals and/or inferring cryptic diversity.

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Population cytogenetics of the "Northern Mod 1" chromosomal race of Liolaemus monticola Müller & Helmich (Iguanidae) from Central Chile

Cited by 7 publications

References 23 publications

Geometric morphometric analysis of the head of Microlophus atacamensis (Tropiduridae) in a latitudinal gradient

Geometric morphometric analysis of the head of Microlophus atacamensis (Tropiduridae) in a latitudinal gradient

Immunocytological analysis of meiotic recombination in two anole lizards (Squamata, Dactyloidae)

Molecular phylogenetic analyses reveal the importance of taxon sampling in cryptic diversity: Liolaemus nigroviridis and L. monticola (Liolaeminae) as focal species

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