The crested newt (<i>Triturus carnifex</i>) in the Submediterranean: Reproductive biology, body size, and age

Cvetković, Dragana; Kalezić, Miloš L.; Djorović, Ana; Džukić, Georg

doi:10.1080/11250009609356116

Cited by 20 publications

(13 citation statements)

References 17 publications

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“…Similarly, Verrell and Francillon (1986) and Cvetković et al (1996) reported that age was significantly correlated with SVL, but only in males of T. vulgaris and T. carnifex. Also, Marunouchi et al (2000) found significant correlations between SVL and age in six populations for both sexes in Cynops pyrrhogaster and they reported a significant correlation for only males in three populations and for only females in two populations.…”

Section: Discussionmentioning

confidence: 84%

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

Kutrup¹,

Yilmaz²,

Bülbül³

2005

Amphib Reptilia

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We 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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Section: Discussionmentioning

confidence: 84%

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

Kutrup¹,

Yilmaz²,

Bülbül³

2005

Amphib Reptilia

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“…In crested newts, large females have more oocytes and heavier ovaries, i.e. they have higher fecundity than smaller females (Cvetković et al. , 1996).…”

Section: Discussionmentioning

confidence: 99%

“…In crested newts, large females have more oocytes and heavier ovaries, i.e. they have higher fecundity than smaller females (Cvetković et al, 1996). This suggests that the increased sexual dimorphism can be related to an increase of parental investment (more eggs, larger eggs or both).…”

Section: Discussionmentioning

confidence: 99%

Ecogeographical variation of body size in the newt Triturus carnifex: comparing the hypotheses using an information‐theoretic approach

Ficetola

Scali

Denoël

et al. 2010

Global Ecology and Biogeography

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Aim Ecogeographical variation of body size in vertebrates (e.g. Bergmann's rule) has long been recognized. However, the patterns and causes of intra-specific ecogeographical variation of body size in ectotherms, and in amphibians in particular, are strongly debated. We identified the relationship between bioclimatic variables and body size predicted a priori by alternative hypotheses (heat balance, endurance, seasonality, starvation resistance, water availability, primary productivity, parental investment) proposed to explain ecogeographical patterns of body size in ectotherms, and we evaluated the relative support of these hypotheses in explaining variation in body size of the Italian crested newt, Triturus carnifex.Location Twenty-three populations covering the whole range of T. carnifex (Austria, Croatia, Italy and Slovenia). MethodsWe obtained data on body size (snout-vent length, SVL) of 2639 adult newts from direct measurements and the literature; we obtained high-resolution environmental data for the sampled localities. We used an information-theoretic approach to evaluate the support of the data for the different hypotheses. We also integrated information on population genetics in our models. ResultsWe observed strong geographical variation of body size. The best Akaike information criterion (AIC) models showed that populations with larger body size are associated with cold climates and secondarily with high primary productivity. Furthermore, sexual dimorphism increases in cold climates, as the increase in body size was stronger for females. When taking into account population genetics, we did not find support for relationships with the other variables. Main conclusionOur results are consistent with three hypotheses proposed to explain ecogeographical variation in amphibians: heat balance, increased parental investment of females and productivity. Information theory provides the framework for comparing hypotheses rather than looking for patterns. We suggest that evaluating the support for mechanisms can provide better insights than simply assessing whether ecogeographical variation is in agreement with some 'rule' .

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“…5. Results for the Vlasi populations were compared with data from the literature (Cvetković et al, 1996and A. Ivanović, unpublished data on T. macedonicus and Üzüm, 2006and Üzüm and Olgun, 2009 on T. ivanbureschi). In three out of four populations females are larger than males of the same age.…”

Section: Resultsmentioning

confidence: 99%

Peer Review #3 of "Absence of heterosis in hybrid crested newts (v0.1)"

2018

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We investigated relationshipsRelationships between phylogenetic relatedness, hybrid zone spatial structure, the amount of interspecific gene flow and population demography were investigated, with the newt genus Triturus as a model system. AIn earlier work, a bimodal hybrid zone of two distantly related species in France combined low interspecific gene flow with hybrid sterility and heterosis, whereas a suite of unimodal hybrid zones in closely related Triturus showed more or less extensive introgressive hybridization with no evidence for heterosis. We here report on population demography and interspecific gene flow in two Triturus species (T. macedonicus and T. ivanbureschi in Serbia) that are moderately related, engage in a heterogeneous uni-/bimodal hybrid zone and hence represent an intermediate situation. TheThis study withused 13 diagnostic nuclear genetic markers ofin a population at the species contact zone. This showed that all individuals were hybrids, with no parentals detected. Age, size and longevity and the estimated growth curves are as in purenot exceeding that of the parental species populations, so that we conclude to the absence of heterosis in T. macedonicus-T. ivanbureschi. Observations across the genus support the hypothesis that fertile hybrids allocate resources to reproduction and infertile hybrids allocate resources to growth. Several Triturus species hybrid zones not yet studied allow the testing of this hypothesis.

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The crested newt (Triturus carnifex) in the Submediterranean: Reproductive biology, body size, and age

Cited by 20 publications

References 17 publications

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

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

Ecogeographical variation of body size in the newt Triturus carnifex: comparing the hypotheses using an information‐theoretic approach

Peer Review #3 of "Absence of heterosis in hybrid crested newts (v0.1)"

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