Contrasting reproductive strategies in a narrow latitude range: the case of D’Orbigny’s slider

in Amphibia-Reptilia
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Reproductive traits and the level of parental investment in offspring varies between individuals and species. These are central issues in life history theory and evolutionary biology. Maternal body size plays an important role in reproduction, and we usually observe variable investment in offspring by females. Thus, optimal egg size may not be reached in some populations or species. In this study, we tested if reproductive traits differed between populations of D’Orbigny’s slider in a specific geographical area in Brazil. We evaluated the relationship between reproductive traits to maternal body size and clutch size to egg size to determine possible trade-offs across populations. At the population level, maternal body size and reproductive traits of D’Orbigny’s slider were different even in geographically nearby areas. Maternal body size had a positive effect on clutch size, but not on egg size, except in the Arroio Grande population. Nevertheless, we did not observe a negative correlation between clutch and egg size in any population. Although maternal body size had effects in the different populations explaining most of the variation of clutch size, variation in egg size may be the result of decreased survival chances in unpredictable environments and possibly morphological constraints. The trade-off between egg size and number was not observed and this could be expected if resource availability and reproductive allocation by females vary greatly among individuals.

Amphibia-Reptilia

Publication of the Societas Europaea Herpetologica

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Figures

  • Location of the three populations of D’Orbigny’s slider sampled in South of Brazil.

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  • Carapace length frequency of reproductive females. (A) Arroio Grande; (B) ESEC Taim; (C) Pelotas.

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  • Linear relationships between clutch size and maternal body size at the three populations of D’Orbigny’s slider turtle. Grey triangles represent Arroio Grande (AIC = 931.94) and the linear model is described by Y=exp(0.012x0.508). Dark grey circles represent ESEC Taim (AIC = 266.93) and the linear model is described by Y=exp(0.007x+0.651). Black diamonds represent Pelotas (AIC = 150.4) and the linear model is described by Y=exp(0.0145x0.931).

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