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<dc:title xml:lang="fr">Améliorer le succès des programmes de renforcement des populations pour une espèce en danger critique d’extinction : le Hamster commun (Cricetus cricetus)</dc:title>
<dcterms:alternative xml:lang="en">Improving the success of reinforcement programs for a critically endangered species : the Common hamster (Cricetus cricetus)</dcterms:alternative>
<dc:subject xml:lang="fr">Conservation</dc:subject>
<dc:subject xml:lang="fr">Prédation</dc:subject>
<dc:subject xml:lang="fr">Comportement</dc:subject>
<dc:subject xml:lang="fr">Ontogénie</dc:subject>
<dc:subject xml:lang="fr">Reproduction</dc:subject>
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<dc:subject xml:lang="fr">Fitness</dc:subject>
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<dc:subject xml:lang="en">Prédation</dc:subject>
<dc:subject xml:lang="en">Behavior</dc:subject>
<dc:subject xml:lang="en">Ontogeny</dc:subject>
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<dcterms:abstract xml:lang="fr">Le Hamster commun (Cricetus cricetus) fait partie des mammifères les plus menacés d’Europe. En Alsace, des populations relictuelles et fragmentées subsistent. Pour tenter de préserver l’espèce, des renforcements de population ont été mis en place au début des années 2000. Ma thèse a cherché à identifier des solutions pour améliorer ces renforcements en étudiant deux facteurs principaux : un facteur extrinsèque (un pré-lâcher temporaire dans un milieu semi-naturel, le soft-release), et un facteur intrinsèque correspondant à l’âge des hamsters au moment des lâchers (adultes et subadultes). Les résultats de ces études ont mis en évidence qu’un soft-release permettait d’augmenter la réactivité des hamsters confrontés à un risque de prédation, se traduisant par une meilleure survie en milieu naturel, comparativement à des individus naïfs du même âge. Cette différence était perceptible jusqu’à un mois post-lâcher. De plus, des femelles lâchées dans la nature 1,5 ou 3 mois après leur naissance en captivité ont eu une survie et une reproduction similaires à celles de femelles adultes âgées d’un an. Ces résultats permettent d’informer les programmes de conservation pour améliorer le succès des renforcements de population.</dcterms:abstract>
<dcterms:abstract xml:lang="en">The Common hamster (Cricetus cricetus) is one of the most endangered mammal in Europe. In Alsace, relict and fragmented populations persist. Population reinforcements have been implemented since the 2000s as an attempt to preserve the species. My thesis sought to identify solutions to improve these reinforcements by examining two main factors: an extrinsic one (a temporary pre-release in a semi-natural environment, known as soft-release) and an intrinsic one related to the age of hamsters at the time of release (adults and subadults). Main results of my work highlighted that a soft-release increased the reactivity of hamster females when facing predation risk, resulting in better survival after release compared to naïve females of the same age. This difference was noticeable for up to one month after release. Furthermore, female hamsters released into the wild 1.5 or 3 months after their birth in captivity had a similar survival rate and reproduction than one-year-old adult females. These findings can be used to inform conservation actions and improve the success of population reinforcements.</dcterms:abstract>
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