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Méthodes d’étude et modélisation de la dynamique de population du triton marbré dans le cadre du projet de construction d’une infrastructure de grande ampleur en zone bocagère dans l’ouest de la France

Abstract : Habitat loss and fragmentation are the main causes of amphibian decline in Western Europe. In spite of regulations concerning the construction of new infrastructures, the lack of knowledge concerning species and their habitat make difficult to evaluate the impact as well as the implementation of effective solutions to preserve biodiversity. Using the example of marbled newt (Triturus marmoratus), a protected species presents in Western France, this works aims at estimating the relevance of the fieldwork and modeling methods available to obtain data necessary for characterizing the dynamic of population for this species. To do so, two populations of marbled newts (situated in Loire Atlantique and Vendée) were studied using torch counts, traps, dip nets, with an intensive capture recapture (CR) protocol, and environmental DNA (eDNA) method. In the first part, this work allowed us to show that within the framework of quantitative characterization of the dynamics of a population, the information gathered by CR is the most reliable. This is especially due to the low and heterogeneous detection rate in space and time for marbled newt, which does not allow traditional methods to get reproducible and transposable results. eDNA is the most accurate method when it comes to estimating occurence but the possibility to use it to estimate absolute or even relative abundances stays a promising perspective that did not succeed yet. In a second chapter, we showed how recent methodological advances in modeling approaches allow estimating time spent by a species in a site thanks to CR data. These methods were applied to marbled newts to highlight a particular phenology, with arriving and leaving individuals being not simultaneous but progressive and each individual occupying the pond only for a part of the breeding season. These results allows to define a methodological frame adapted to develop long term studies of compensation measures within the framework of the construction project, but also more generally for future studies of urodele species.
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https://tel.archives-ouvertes.fr/tel-02106998
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Submitted on : Tuesday, April 23, 2019 - 2:29:05 PM
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2017PSLEP063_archivage.pdf
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  • HAL Id : tel-02106998, version 1

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Sandra Guerin. Méthodes d’étude et modélisation de la dynamique de population du triton marbré dans le cadre du projet de construction d’une infrastructure de grande ampleur en zone bocagère dans l’ouest de la France. Ecosystèmes. Université Paris sciences et lettres, 2017. Français. ⟨NNT : 2017PSLEP063⟩. ⟨tel-02106998⟩

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