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<title><string language="fre"><![CDATA[Dr Liliana D’Alba - Eggshell mineralization in relation to nesting ecology in reptiles]]></string></title>
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<string language="fre"><![CDATA[Egg morphology
is essential for animal survival, mediating the interactions between embryos
and their environment, and a result have evolved into an enormous diversity of
forms and functions in modern vertebrates. Reptiles show considerable variation in the
degree eggshell calcification, which through evolution shows a tendency to
increase. Several hypotheses have been proposed to explain the advantages of
intensified mineralization, for example that calcified eggshells increase
protection of embryos from mechanical and biological stressors, modulate gas
exchange and water physiology or that calcification might be a detoxification
mechanism. However, these hypotheses still await experimental validation.
Moreover, a vast proportion of reptiles successfully reproduce based on
eggshells with incipient or no calcification. Thus, the questions of why the
process of increasing calcification of eggshells occurred or about the
advantages of shell calcification still remain. In this study I characterized
eggshell structure and chemical composition of eggshells of 96 species, and
performed comparative phylogenetic analyses to investigate the relationship
between life-history, nesting ecology and functional properties on the
evolution of calcification of reptile eggshells. The findings show that reptile eggs display larger diversity in egg phenotypes than
previously thought and that this diversity is coupled with a large range of
functional properties.
Calcium content is correlated with adult body size but it seems a poor
predictor of its functional performance. At a large scale, the nesting
environment seems to play a minor role in determining the level of
mineralization of eggshells but specific nesting microclimates might lead to
particular calcification patterns. Inferences generated in this project will
contribute to increase our understanding about the
importance of reptile eggs on vertebrate evolution and diversification.
 ]]></string></description>
<keyword><string language="fre"><![CDATA[coquille oeuf]]></string></keyword>
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<date><dateTime>2021-03-23</dateTime></date>
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@ LE STUDIUM 2021]]></string>
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<string language="fre"><![CDATA[Innate immunity in a biomineralized context: trade-offs or synergies?]]></string>
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