Effects of sexual differences of age at maturity and survival on population sex ratio |
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| Authors: | Marc Girondot Claude Pieau |
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| Institution: | (1) Laboratoire de Biochimie du Développement, Institut Jacques Monod, Centre National de la Recherche Scientifique et Université Paris 7, 2 place Jussieu, 75251 Paris cedex 05, France |
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| Abstract: | Summary Five demographical factors influencing the sex ratio of a population are classically considered. The influence of two of them is dependent on the longevity of individuals in the population. The effect of differential age at maturity between males and females is higher for animals with low annual survival, whereas the effect of differential annual survival between males and females is higher for animals with high annual survival. Such a conclusion applied to turtles, which are long life-span animals, allows us to retain differential survival between sexes as a major factor influencing the population sex ratio. |
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| Keywords: | sex ratio long life-span turtle survival sexual maturity |
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