Age, Body Size, and Sexual Dimorphism in Size and Shape in Salamandrella keyserlingii (Caudata: Hynobiidae)

Hasumi, Masato

doi:10.1007/s11692-010-9080-9

Cited by 45 publications

(41 citation statements)

References 50 publications

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“…For B. andrewsi, adult females significantly exceeded adult males in body size, a condition seen in about 90% of anuran species (Shine, 1979). Several proximate causes have been invoked, including sex differences in growth rate, age structure, age at maturity, and adult survivorship in explaining sexual size dimorphism (Halliday and Tejedo, 1995;Monnet and Cherry, 2002;Hasumi, 2010). Previous studies on this species showed that males have smaller age at maturity, average age and growth rate than females (Liao, 2009).…”

Section: Discussionmentioning

confidence: 99%

Evolution of sexual dimorphism in the forelimb muscles of Andrew's toad (Bufo andrewsi) in response to putative sexual selection

Liao

Barrett

2012

Animal Biol

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Sexual differences in morphological traits are widespread among animals. Theory predicts that dimorphism in secondary sexual characters evolves as a consequence of sexual selection. We investigated the intersexual difference in mass of forelimb muscles of the Andrew's toad, Bufo andrewsi, an elongated species inhabiting montane regions in western China. Our results showed that average body size of females was significantly larger than males. However, when the influence of body size was removed, the forelimb muscle mass of males significantly exceeded that of females, and total mass of forelimb muscles of amplectant males was significantly larger than that of non-amplectant males. These results suggest that the robustness of the forelimbs can allow amplectant males to retain a firm grip on the female in amplexus, which may aid resistance to inference by conspecific males. Our findings are consistent with the prediction that sexual selection favors large forelimb muscle mass in males.

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Section: Discussionmentioning

confidence: 99%

Evolution of sexual dimorphism in the forelimb muscles of Andrew's toad (Bufo andrewsi) in response to putative sexual selection

Liao

Barrett

2012

Animal Biol

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“…The sexual dimorphism of salamanders has attracted considerable interest in evolutionary biology (e.g., Halliday & Arano 1991;Kalezić et al 1992;Andersson 1994;Malmgren & Thollesson 1999;Serra-Cobo et al 2000;Ivanović et al 2008), but few studies have focused on Asian salamanders (Kuzmin 1995;Hasumi 2001Hasumi , 2010Poyarkov et al 2012). …”

Section: Please Scroll Down For Articlementioning

confidence: 99%

Sexual size and shape dimorphism in the Wushan salamander,Liua shihi(Liu, 1950) (Urodela: Hynobiidae)

Zhang

Xiong

et al. 2014

Italian Journal of Zoology

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Sexual dimorphism in size or shape is widespread in the animal world. Many studies have explored this topic, but few have focused on Asian salamanders. In this study, we analyzed morphometric data of the Wushan salamander Liua shihi, an endemic Chinese salamander, to examine sexual dimorphism in size and shape. We evaluated data sets that included 17 morphometric characteristics of 61 females and 55 males using univariate and multivariate methods. Results show that sexual dimorphism in this species includes not only body size (males have a longer snout-vent length than females), but also shape (females have a longer space between axilla and groin and head size than males, while males have greater limb size). This article discusses the evolution of intersexual dimorphism according to models of ecology, fecundity and sexual selection. We propose that sexual dimorphism of body size can be attributed to sexual selection and local climates, that AGS may contribute to fecundity selection, that head size may be attributed to reproductive roles and ecology, and that limb size may be beneficial for reproductive success. However, most aspects of the reproductive biology, ecology and life history of this species remain unknown. This article fills a gap in the literature on this species and builds a foundation for future research. Research on such species is increasingly important as many species of salamander are becoming threatened or endangered throughout the world.

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“…). Secondly, SSD can start to occur after hatch but before fledging, as a result of differences in the duration or rate of growth (Leigh & Shea , Hasumi , Zhang & Liu , Lok et al . ).…”

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confidence: 99%

Sex‐specific growth in chicks of the sexually dimorphic Black‐tailed Godwit

Loonstra

Verhoeven

Piersma

2017

Ibis

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Sexual size dimorphism (SSD) is common in birds and has been linked to various selective forces. Nevertheless, the question of how and when the sexes start to differentiate from each other is poorly studied. This is a critical knowledge gap, as sex differences in growth may cause different responses to similar ecological conditions. In this study, we describe the sex-specific growth -based on body mass and five morphometric measurements -of 56 captive Black-tailed Godwit Limosa limosa limosa chicks raised under ad libitum food conditions, and conclude that all six growth curves are sex-specific. Females are the larger sex in terms of body mass and skeletal body size. To test whether sex-specific growth leads to sex-specific susceptibility to environmental conditions, we compared the age-specific sizes of male and female chicks in the wild with those of Black-tailed Godwits reared in captivity. We then tested for a relationship between residual growth and relative hatching date, age, sex and habitat type in which the wild chicks were born. Early-hatched chicks were relatively bigger and in better condition than late-hatched chicks, but body condition and size were not affected by natal habitat type. Female chicks deviated more negatively from the sex-specific growth curves than male chicks for body mass and total-head length. This suggests that the growth of the larger females is more susceptible to limiting environmental conditions. On average, the deviations of wild chicks from the predicted growth curves were negative for all measurements, which suggests that conditions are limiting in the current agricultural landscape. We argue that in estimating growth curves for sexually dimorphic species, it is critical first to make accurate sex and age determinations.

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Age, Body Size, and Sexual Dimorphism in Size and Shape in Salamandrella keyserlingii (Caudata: Hynobiidae)

Cited by 45 publications

References 50 publications

Evolution of sexual dimorphism in the forelimb muscles of Andrew's toad (Bufo andrewsi) in response to putative sexual selection

Evolution of sexual dimorphism in the forelimb muscles of Andrew's toad (Bufo andrewsi) in response to putative sexual selection

Sexual size and shape dimorphism in the Wushan salamander,Liua shihi(Liu, 1950) (Urodela: Hynobiidae)

Sex‐specific growth in chicks of the sexually dimorphic Black‐tailed Godwit

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