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Master thesis

Suivi d'une espèce rare en vue de sa conservation: dynamique spatiale et temporelle de populations de Pélobate cultripède (Pelobates cultripes) en Aquitaine

Abstract : Knowledge of key demographic parameters of a population is an essential preliminary step to the establishment of appropriate management measures for effective protection of the species. That's why a conservation program was founded by the association Cistude Nature between 2009 and 2011 in partnership with the National Office of Forest, to enable the acquisition of information on a rare and little known species of amphibian, the western spadefoot toad (Pelobates cultripes). This work has focused mainly on the issues of the species detection, distribution, population dynamics and habitat use. Its main objective was to highlight the environmental parameters required for the presence and the maintenance of its populations. To this end, several approaches have been implemented at different scales of landscape. First, inventory consisted in using different methods of detection and deal in parallel with aquatic breeding habitat selection; a second approach consisted in a radio-tracking monitoring to address terrestrial habitat selection; and a third one consisted in a Capture-Recapture monitoring to address demography and population dynamics. Results show difference in efficiency between the different detection methods employed, with a higher effectiveness for terrestrial inventories. They also show that the species prefer terrestrial open vegetated sites, closed to sunny aquatic habitats with little slope for reproduction. Individuals, active throughout the year, are more mobile in spring when they attend any type of terrestrial habitats rather bushy or forestry than in winter when they remain more exposed near the breeding site. The study on pilot Gironde coast site hosted a population of three hundred individuals, for 2/3 males, presumably closed to exchange with negligible temporary migration, with a low capture probability (p<0,20), higher in May, June and November, and a relatively low survival rate (S=0,50), higher for males than females. This study emphasizes on the importance of terrestrial habitats in amphibian protection and underlines the importance of long term demography studies to appropriately adjust efficient conservation strategies.
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Master thesis
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https://hal-ephe.archives-ouvertes.fr/hal-01424521
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Submitted on : Monday, January 2, 2017 - 2:44:01 PM
Last modification on : Wednesday, November 17, 2021 - 12:31:50 PM
Long-term archiving on: : Tuesday, April 4, 2017 - 12:46:59 AM

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  • HAL Id : hal-01424521, version 1

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Pauline Priol. Suivi d'une espèce rare en vue de sa conservation: dynamique spatiale et temporelle de populations de Pélobate cultripède (Pelobates cultripes) en Aquitaine. Sciences de l'environnement. 2015. ⟨hal-01424521⟩

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