Reproductive activity and plasma androgen concentrations in the male of<i>Rana dalmatina</i>

Guarino, Fabio Maria; Bellini, Luigi

doi:10.1080/11250009309355824

Cited by 11 publications

(3 citation statements)

References 15 publications

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“…However, the agile frog sex chromosomes are homomorphic (Jeffries et al, 2018), suggesting limited genetic differentiation between the sexes. By this latter logic, female-to-male sex-reversed individuals may be more likely to resemble concordant males, due to the presence of testes which produce androgen hormones that stimulate the expression of male phenotypic traits (Guarino and Bellini, 1993). We evaluated these predictions by comparing early life development, growth, and behavior among three groups: males and females with concordant genetic and phenotypic sex, and female-to-male sex-reversed individuals.…”

Section: Introductionmentioning

confidence: 99%

Sex Reversal and Performance in Fitness-Related Traits During Early Life in Agile Frogs

et al. 2021

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Sex reversal is a mismatch between genetic sex (sex chromosomes) and phenotypic sex (reproductive organs and secondary sexual traits). It can be induced in various ectothermic vertebrates by environmental perturbations, such as extreme temperatures or chemical pollution, experienced during embryonic or larval development. Theoretical studies and recent empirical evidence suggest that sex reversal may be widespread in nature and may impact individual fitness and population dynamics. So far, however, little is known about the performance of sex-reversed individuals in fitness-related traits compared to conspecifics whose phenotypic sex is concordant with their genetic sex. Using a novel molecular marker set for diagnosing genetic sex in agile frogs (Rana dalmatina), we investigated fitness-related traits in larvae and juveniles that underwent spontaneous female-to-male sex reversal in the laboratory. We found only a few differences in early life growth, development, and larval behavior between sex-reversed and sex-concordant individuals, and altogether these differences did not clearly support either higher or lower fitness prospects for sex-reversed individuals. Putting these results together with earlier findings suggesting that sex reversal triggered by heat stress may be associated with low fitness in agile frogs, we propose the hypothesis that the fitness consequences of sex reversal may depend on its etiology.

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Section: Introductionmentioning

confidence: 99%

Sex Reversal and Performance in Fitness-Related Traits During Early Life in Agile Frogs

et al. 2021

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“…R. esculenta, R. ridibunda, R. epeirotica, while the discontinuous type has evolved in the brown frogs, e.g. R. dalmatina (Guarino and Bellini, 1993). So, we could speculate that spermatogenetic type probably is related not only to climatic conditions but also to the reproductive pattern.…”

Section: Discussionmentioning

confidence: 91%

Male reproductive cycle of the water frog Rana epeirotica in northwestern Greece

Tsiora¹,

Kyriakopoulou-Sklavounou²

2001

Amphib Reptilia

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The reproductive cycle of male Rana epeirotica was studied with emphasis on spermatogenetic activity and changes in the weights of testis, fat body and liver. The spermatogenesis of Rana epeirotica is of the potentially continuous type. Significant seasonal variations were observed in testis, fat body and liver weight. The seasonal variation of testis weight showed a good agreement with the spermatogenetic cycle. The reduction of fat body weight during the pre-hibernating period was attributed to mobilizing of lipids to other body parts or to transformation into other metabolites. The significant decrease of liver weight in the dormant period indicates that this frog consumes mainly glycogen during wintering. The greatest decrease of fat body and liver weight in May results from the intensive activities related to reproduction and maintenance.

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“…Είναι αξιοσηµείωτο, ότι ανάµεσα στα διάφορα είδη Rana της Ευρώπης, ο δυνητικά συνεχής σπερµατογενετικός κύκλος παρατηρείται κυρίως στους νεροβατράχους, ενώ οι καφέ βάτραχοι της ίδιας περιοχής, έχουν αναπτύξει τον ασυνεχή σπερµατογενετικό κύκλο (π .χ R. dalmatina,, Guarino & Bellini, 1993). Έτσι θα µπορούσαµε να υποθέσουµε ότι ο σπερµατογενετικός κύκλος, πέρα από τις περιβαλλοντικές συνθήκες, εξαρτάται και από τον αναπαραγωγικό πρότυπο των βατράχων.…”

Section: (αύξηση στόµατος)unclassified

Βιολογία αναπαραγωγής του νεροβατράχου Rana Epeirotica (Schneider et al. 1984) της λίμνης των Ιωαννίνων

Tsiora¹

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Reproductive activity and plasma androgen concentrations in the male ofRana dalmatina

Abstract: Reproductive activity (spermatogenesis, testis and fat-body weight, thumpad) is related to environmental factors and plasma androgen levels in the male of Rana dalmatina.

Cited by 11 publications

References 15 publications

Sex Reversal and Performance in Fitness-Related Traits During Early Life in Agile Frogs

Sex Reversal and Performance in Fitness-Related Traits During Early Life in Agile Frogs

Male reproductive cycle of the water frog Rana epeirotica in northwestern Greece

Βιολογία αναπαραγωγής του νεροβατράχου Rana Epeirotica (Schneider et al. 1984) της λίμνης των Ιωαννίνων

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