Thermal ecophysiology of Basiliscus galeritus (Squamata: Corytophanidae) in two populations at different altitudes: Does the crest participate actively in thermoregulation?

AbstractWe estimated differences in body size and age structure of two populations of Pelophylax ridibundus living at different altitudes in Turkey, one from Dörtyol (6 m a.s.l.) and the other from Karagöl (1480 m a.s.l.). Their age structure was determined by skeletochronology performed on the LAGs (lines of arrested growth) of the phalanges. While ages ranged from 2 to 8 years for males and from 2 to 7 years for females in Karagöl, in Dörtyol the ages ranged from 4 to 11 years for males, and 3 to 7 years for females. Sexual size dimorphism was only found in the Dörtyol population. Larger females tend to be found in hotter climates (Dörtyol) but reach maturity later (3-4 years) than the highland population (2 years). A significant relationship between age and snout-vent length (SVL) was found for both sexes and populations with the exception of females in Dörtyol.

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Age, growth and survival rate in two populations of Darevskia derjugini (Nikolsky, 1898) from different altitudes (Squamata: Sauria: Lacertidae)

Animal Biology ◽

10.1163/15707563-bja10025 ◽

2020 ◽

pp. 1-15

Author(s):

Abdullah Altunışık ◽

Halit Eksilmez

Keyword(s):

Body Size ◽

Survival Rate ◽

Life Expectancy ◽

Age Structure ◽

Sexual Maturity ◽

Adult Life ◽

Growth And Survival ◽

Low Altitude ◽

Two Populations ◽

Different Altitudes

Abstract We investigated age structure, age at sexual maturity, lifespan, growth and survival rate and adult life expectancy (as demographic life-history traits) as well as body size of two Darevskia derjugini (Artvin lizard) populations from different altitudes, using skeletochronology. Our findings indicated that age upon attaining sexual maturity was two or three years in the low-altitude population (Fındıklı) while it was three years in the high-altitude population (Murgul) for both sexes. The maximum longevity was seven years in the high-elevation site while it was six years in the low-elevation site. As reported for many lizards, we found a significant positive relationship between age and body size within each sex of Artvin lizard at both altitudes. High- and low-altitude populations did not differ in age structure, survival rates, adult life expectancy and body size. Rather than the effect of altitude, which is hard to compare without replication of other low and high altitude populations, the fact that these two populations have similar growth rates and the similarity of local conditions (food availability and predator density) may indicate similarity between the two regions.

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A Comparison of Somatic Condition and Testis Mass in Black-Spectacled Toad (Duttaphrynus melanostictus) between Two Populations at Different Altitudes

Pakistan Journal of Zoology ◽

10.17582/journal.pjz/20190318020331 ◽

2020 ◽

Vol 52 (6) ◽

Author(s):

Duo Jing Qiu ◽

Xin Yu ◽

Mao Jun Zhong ◽

Long Jin

Keyword(s):

Duttaphrynus Melanostictus ◽

Somatic Condition ◽

Two Populations ◽

Testis Mass ◽

Different Altitudes

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Age Determination in Two Populations of the Snake-eyed Lizard (Ophisops elegans) (Sauria: Lacertidae) at Different Altitudes

Journal of Anatolian Environmental and Animal Sciences ◽

10.35229/jaes.288008 ◽

2017 ◽

Vol 2 (1) ◽

pp. 11-14

Author(s):

ABDULLAH ALTUNIŞIK ◽

TUĞBA ERGÜL KALAYCI ◽

İBRAHİM UYSAL ◽

MURAT TOSUNOĞLU ◽

NURHAYAT ÖZDEMİR

Keyword(s):

Age Determination ◽

Two Populations ◽

Different Altitudes ◽

Ophisops Elegans

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Age structure in two populations of Triturus vittatus ophryticus at different altitudes

Amphibia-Reptilia ◽

10.1163/1568538053693314 ◽

2005 ◽

Vol 26 (1) ◽

pp. 49-54 ◽

Cited By ~ 12

Author(s):

Bilal Kutrup ◽

Nurhayat Yilmaz ◽

Ufuk Bulbul

Keyword(s):

Body Size ◽

Sexual Dimorphism ◽

Age Structure ◽

Breeding Populations ◽

Minimum Age ◽

The Mean ◽

Age At Maturation ◽

Two Populations ◽

Different Altitudes

AbstractWe investigated age structure by skeletochronology in two breeding populations of Triturus vittatus ophryticus inhabiting altitudes ranging from 300 m (in Gurbulak) to 1300 m (in Hidirnebi) in northeastern Turkey. The mean age was 4 years (maximum 10) in Gurbulak population and 8 (maximum 16) in Hidirnebi population. In the lowland population, minimum age at maturation was two to three years while it was four years in the highland population. The mean snout-vent length of the populations was significantly different and we found no correlation between age and snout-vent length except for females of Gurbulak. Sexual dimorphism in body size and weight was detected in both populations.

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Comparison of Principal Component Solutions in Two Populations

Methodology ◽

10.1027/1614-2241/a000099 ◽

2016 ◽

Vol 12 (1) ◽

pp. 11-20 ◽

Cited By ~ 1

Author(s):

Gregor Sočan

Keyword(s):

Simulation Study ◽

Principal Components ◽

Common Factor ◽

Principal Component ◽

Component Model ◽

Bootstrap Procedure ◽

Factor Loadings ◽

Component Loadings ◽

Principal Component Model ◽

Two Populations

Abstract. When principal component solutions are compared across two groups, a question arises whether the extracted components have the same interpretation in both populations. The problem can be approached by testing null hypotheses stating that the congruence coefficients between pairs of vectors of component loadings are equal to 1. Chan, Leung, Chan, Ho, and Yung (1999) proposed a bootstrap procedure for testing the hypothesis of perfect congruence between vectors of common factor loadings. We demonstrate that the procedure by Chan et al. is both theoretically and empirically inadequate for the application on principal components. We propose a modification of their procedure, which constructs the resampling space according to the characteristics of the principal component model. The results of a simulation study show satisfactory empirical properties of the modified procedure.

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