Aspectos evolutivos da história de vida e estrutura da casca do ovo de lagartos tropiduríneos / Evolutive aspects of life history and eggshell morphology of Tropidurinae lizards

AUTOR(ES)

Renata Brandt Nunes

DATA DE PUBLICAÇÃO

2010

RESUMO

In lizards, life history components have great phenotypic plasticity and evolve in a correlated way. Clutch size, for example, tends to be positively correlated to body size of gravid females, when comparing different evolutive lineages or different individuals, though some kinds of habit seems to restrict larger clutches. There are indications that other factors, such as climate components or latitude, also determine characteristics of lizard life history, as a matter of thermal physiology or ecology. Climate factors also affect different aspects of lizards reproduction, for example the structure and morphology of Squamata eggshells, as differences observed in these factors between oviparous lizards lineages indicate. In this context, the present work investigated evolutive aspects of Tropidurinae lizards life history and its relation to climate components and latitude, using comparative phylogenetic methods. It has been observed that clutch size is positively correlated to body size in the Tropidurinae lineage. On the other hand, this pattern is not observed in lizards with scansorial habits or those that inhabit rock crests, maybe due to compromises involving the weight and shape of female bodies that can affect female survival. The body size in Tropidurinae is larger in geographical regions presenting higher precipitation, possibly due to increased food availability. Female body size decreases with increased distance from the Equator until approximately 1500 km. Beyond this limit, female body size increases. Additionally, morphology and structure of eggshells were studied on Tropidurus torquatus, one of the species within the Tropidurinae group with higher latitudinal range of distribution. Tropidurus torquatus eggshell morphology follows the general pattern described for Squamata with some particularities, and future comparative studies are needed to elucidate evolutive patterns of eggshell morphology in the group.

ASSUNTO(S)

eggshell morphology estrutura de casca história de vida life history tropidurinae tropidurinae

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