Evolution of sex-chromosomes in lacertid lizards

Olmo, Ettore; Odierna, Gaëtano; Capriglione, Teresa

doi:10.1007/bf00285880

Cited by 61 publications

(54 citation statements)

References 16 publications

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“…As far as we know, there is no information about the sex chromosomes of Dendrobatidae, Craugastoridae, Polychrotidae, and Tropiduridae in the literature. Dactyloidae members have homomorphic sex chromosomes (Gamble et al, 2014), but Lacertidae, Agamidae, and the majority of Gekkonidae members have female heterogametic systems (Olmo et al, 1987;Ezaz et al, 2005Ezaz et al, , 2009Kupriyanova et al, 2008;Molavi et al, 2014), while Scincidae and Iguanidae members have male systems (Ezaz et al, 2009). The above-mentioned information about chromosomal sex-determination systems confirmed our statement that species with female heterogametic systems (such as Lacertidae and Agamidae) are characterized by higher digit ratios in males, whereas, species with male heterogametic systems (such as humans and all species of newts which we studied) are characterized by higher digit-ratio in females.…”

Section: Discussionmentioning

confidence: 99%

Females Have Larger Ratio of Second‐to‐Fourth Digits Than Males in Four Species of Salamandridae, Caudata

Kaczmarski

Kubicka

Tryjanowski

et al. 2015

The Anatomical Record

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Digit ratio (2D:4D) denotes the relative length of the second and fourth digits. It is considered to be a suitable biomarker of the in utero balance of fetal sex hormones, which affect early development of individua ls behavioral and morphological characteristics. In recent decades, digit ratio attracted a great attention in biology and psychology. However, for unmasking the biological basis of the phenomenon, extensive studies on nonhuman animals are necessary. Despite it was hypothesized that digit ratio is well conserved in all Tetrapoda, and there exist studies on mammals, birds, and reptiles, there are only two such study on anuran amphibians. Therefore, the aim of this study is to investigate the 2D:4D in the most basal salamanders, Caudata. We have studied digit ratio in four species of newts: Triturus cristatus, Mesotriton alpestris, Lissotriton montandoni, and Lissotriton vulgaris, using museum collection. We used computerized measuring of each limbs photos. We have found out that, in M. alpestris, females 2D:4D of all four limbs were significantly larger than in males. In L. montandoni and L. vulgaris, only 2D:4D of rear limbs significantly differed, in females being larger. In T. cristatus, digit ratios of males and females did not statistically differ. Thus, the results confirmed our hypothesis that at least in M. alpestris, L. montandoni, and L. vulgaris, females seem to have larger 2D:4D comparing to males, the pattern known from most mammals and opposite to birds, reptiles and anuran amphibians.

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Section: Discussionmentioning

confidence: 99%

Females Have Larger Ratio of Second‐to‐Fourth Digits Than Males in Four Species of Salamandridae, Caudata

Kaczmarski

Kubicka

Tryjanowski

et al. 2015

The Anatomical Record

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“…The location of the NOR has been demonstrated to be of phylogenetic and taxonomic validity in many animal groups including amphibians, reptiles, and fish (Amemiya and Gold, 1990;King, 1990;Olmo et al, 1993). In the genus Mantidactylus, Aprea et al (1998) have found variability of the NOR location among different species groups and subgenera but, on the other hand, a constant state within these groups.…”

Section: Discussionmentioning

confidence: 99%

Chromosome Data for Malagasy Poison Frogs (Amphibia: Ranidae: Mantella) and Their Bearing on Taxonomy and Phylogeny

Odierna¹,

Vences

Aprea³

et al. 2001

Zoological Science

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“…For example, the lack of cytogenetically distinct sex chromosomes could suggest a polygenic sex-determining mechanism, as suggested in some fishes (Devlin & Nagahama 2002), which may facilitate retention of genetic variation in sex determination. However, it should be stressed that in other groups of lizards, for example, Lacertidae, where a ZW sex chromosome system has been shown to occur almost universally (Olmo et al 1987;Odierna et al 1993), sex chromosomes can evolve rapidly and independently in related taxa (Bosch in den et al 2003;Odierna et al 2004). This could be applied in agamids also, where a recent study has found heteromorphic W and Z micro-chromosomes in the bearded dragon, Pogona vitticeps (Ezaz et al 2005), suggesting that further studies on micro-chromosomes in agamids could reveal novel patterns.…”

Section: Discussionmentioning

confidence: 99%

Consistent sex ratio bias of individual female dragon lizards

et al. 2006

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Sex ratio evolution relies on genetic variation in either the phenotypic traits that influence sex ratios or sex-determining mechanisms. However, consistent variation among females in offspring sex ratio is rarely investigated. Here, we show that female painted dragons (Ctenophorus pictus) have highly repeatable sex ratios among clutches within years. A consistent effect of female identity could represent stable phenotypic differences among females or genetic variation in sex-determining mechanisms. Sex ratios were not correlated with female size, body condition or coloration. Furthermore, sex ratios were not influenced by incubation temperature. However, the variation among females resulted in female-biased mean population sex ratios at hatching both within and among years.

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Evolution of sex-chromosomes in lacertid lizards

Cited by 61 publications

References 16 publications

Females Have Larger Ratio of Second‐to‐Fourth Digits Than Males in Four Species of Salamandridae, Caudata

Females Have Larger Ratio of Second‐to‐Fourth Digits Than Males in Four Species of Salamandridae, Caudata

Chromosome Data for Malagasy Poison Frogs (Amphibia: Ranidae: Mantella) and Their Bearing on Taxonomy and Phylogeny

Consistent sex ratio bias of individual female dragon lizards

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