Skeletochronology and Geographic Variation in Age Structure in the Wood Frog, Rana sylvatica

Sagor, Eli; Ouellet, Martin; Barten, Evelynne; Green, David M.

doi:10.2307/1565199

Cited by 73 publications

(72 citation statements)

References 11 publications

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“…In the study, the maximum age recorded for both populations was 3 years in males and 4 years in females. Similar life spans have been reported in other anurans, such as R. sylvatica (Sagor et al 1998), R. japonica (Marunouchi et al 2002) and R. latastei (Guarino et al 2003). In both populations, longevity of females was greater than males.…”

Section: Discussionsupporting

confidence: 84%

Age structure and body size of two populations of the rice frogRana limnocharisfrom different altitudes

Liao

Lü

Shen

et al. 2011

Italian Journal of Zoology

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Identifying the patterns of body size and age in relation to altitudes may help us to understand the evolution of life history of organisms. With this view, we compared the demographic traits of a subtropical frog, Rana limnocharis, between populations from southwestern China located at two altitudes (310 and 800 m) with distinct mean annual temperature (17.1°C and 15.2°C). Overall, frogs from the higher altitude tended to be significantly larger in body size. Within each population, adult females were markedly larger and older than males. However, average age between high altitude and low altitude was not strongly different within each sex. There were significant relationships between age and body size within each sex in both altitudes. ANCOVAs revealed that body size within sexes differed significantly between altitudes when the effect of age was removed. Our findings suggest that factors other than age may contribute to differences in body size between altitudes, such as air temperature and breeding season length.

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Section: Discussionsupporting

confidence: 84%

Age structure and body size of two populations of the rice frogRana limnocharisfrom different altitudes

Liao

Lü

Shen

et al. 2011

Italian Journal of Zoology

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“…We marked all individuals with the toe-clipping method and then released them in situ. We also clipped the three phalanges of the fourth toe of the left hind limb and preserved them in a 10% neutral buffered formalin water solution for at least 5 days for the skeletochronological study (Sagor et al 1998;Lai et al 2005).…”

Section: Sampling Methodsmentioning

confidence: 99%

“…Each slide with the label covered was read twice by the observers (Morrison et al 2004;Lai et al 2005). The endosteal resorption from the inner surface of the bone could completely destroy LAGs, resulting in age determination error (Sagor et al 1998;Rozenblut and Ogielska 2005). Following the protocol of Lai et al (2005), we compared the major axis of the innermost LAG of each section with the mean of juveniles' LAG without resorption.…”

Section: Skeletochronologymentioning

confidence: 99%

Altitudinal variation in body size and age structure of the Sauter’s frog Rana sauteri in Taiwan

Hsu

Hsieh

et al. 2014

Zool. Stud.

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Background: The tendency for organisms to be larger in cooler climates, the so-called Bergmann's rule, has been widely observed in endotherms, but it is debatable in ectothermic anurans. Altitudinal variations in body size, age, and growth rate of the Sauter's frog Rana sauteri were investigated with skeletochronology at six sites along the altitudinal gradients from 330 to 2,320 m in subtropical Taiwan. The aims of this study were to determine whether these life history traits vary with altitude and differ between males and females. Results: The body size of male R. sauteri followed a converse Bergmann's cline; the size decreased with increase in altitude, while no significant altitudinal change was found for females. The size dimorphism was female-biased and became greater at higher altitudes because of the altitudinal decrease in male size. Ages ranged between 1 and 5 years for males and 1 and 6 years for females. There was no significant difference in the age structures between the two sexes, but both sexes had higher average ages at higher-altitude sites. According to von Bertalanffy's model, the growth coefficients decreased with increase in altitude for males but not for females. The annual growth rates were greater for all age classes of females than males, suggesting that growth rate was a major factor underlying body size patterns of both sexes. Conclusions: Growth rate was a major factor underlying body size patterns in both sexes of R. sauteri. It could be affected by not only altitudinal temperature gradient but also sex-biased life history traits and environmental factors.

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“…Hemelaar, 1988;Kusano et al, 1995a;Sagor et al, 1998). The method is based on the presence of growth layers recorded in cross-sections of long bones (Halliday and Verrell, 1988;Castanet and Smirina, 1990).…”

Section: Introductionmentioning

confidence: 99%

Age Determination by Skeletochronology of Rana nigrovittata, a Frog from Tropical Forest of Thailand

2000

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ABSTRACT-Age in 96 individuals of a tropical frog Rana nigrovittata from Thailand was skeletochronologically investigated. Hematoxylinophilic lines interpreted as lines of arrested growth (LAGs) were observed clearly in the periosteal bone suggesting that this technique can be used to estimate the age of frogs from tropical Asia. The maximum age observed was nine years in males and six in females, but age structure did not differ significantly between the sexes. In the same age class, males were significantly larger than females.

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Skeletochronology and Geographic Variation in Age Structure in the Wood Frog, Rana sylvatica

Cited by 73 publications

References 11 publications

Age structure and body size of two populations of the rice frogRana limnocharisfrom different altitudes

Age structure and body size of two populations of the rice frogRana limnocharisfrom different altitudes

Altitudinal variation in body size and age structure of the Sauter’s frog Rana sauteri in Taiwan

Age Determination by Skeletochronology of Rana nigrovittata, a Frog from Tropical Forest of Thailand

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