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Master Thesis

Individual phenotype, conspecific interactions and access to reproduction in an iteparous cryptic poikilotherm : the European Pond Turtle Emys orbicularis

Abstract : The theory of evolution predicts that the reproductive success of an organism, i.e. the number of offspring, depends on its phenotypic traits and conspecific interactions. In oviparous species where females provide most of the reproductive costs, larger females are predicted to produce larger clutches. Additionally, when females mate with more than one single male during the breeding season, conspecific interactions are predicted to be centred around females. These two predictions were tested in a female-biased sexual size dimorphic species, the European Pond Turtle Emys orbicularis, where multiple paternity has been reported but whose social interactions are unknown. We investigated individual biometry and conspecific interactions in 23 adults and genetic-inferred paternity of their offspring born between 2012 and 2020 in the conservatory facility of Petite Camargue Alsacienne, Saint-Louis, France. For the 112 collected clutches, multiple paternity occurrence frequency was 38%, with 2 (35%) to 3 (3%) fathers per clutch. Fathers’ body colour has been correlated with single paternity. However, female position in the social network could not predict individual mating (single versus multiple paternity) strategy. When reproduction and potentially population dynamics mainly depend on maternal traits, females have to be highly considered, particularly in species of conservation concern.
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Master Thesis
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https://dumas.ccsd.cnrs.fr/dumas-02975257
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Submitted on : Thursday, October 22, 2020 - 3:20:53 PM
Last modification on : Sunday, January 10, 2021 - 3:08:50 AM
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Anne-Sophie Le Gal. Individual phenotype, conspecific interactions and access to reproduction in an iteparous cryptic poikilotherm : the European Pond Turtle Emys orbicularis. Life Sciences [q-bio]. 2020. ⟨dumas-02975257⟩

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