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Importance de la structure des haies, des lisières, et de la disponibilité en abris sur la biodiversité, implications en termes de gestion

Abstract : During the last decencies, massive amounts of hedgerows and forest hedges have been destroyed in Europe whereas increasing fire regimes threatened Mediterranean habitats. The loss of these hedge habitats is concomitant to a drastic loss of biodiversity. Notably through the decrease of shelter available to the fauna. This thesis aims to investigate the role of refuges considering different scales and biological systems. First, the positive influence of the availability of shelter at the base of hedgerows on biodiversity has been demonstrated using surveys and a field experiment. For that, a novel technique has been developed by combining the advantages of rapid biodiversity assessments with non-lethal procedures. At an intermediary scale, the positive impact of habitat opening on ophidian populations has been shown in a forest context. Finally, individual monitoring of Hermann tortoises allowed us to examine the impact of a major fire in habitat changes; the results suggest that burnt habitats remain suitable on the long term. In conclusion, the importance of refuges on biodiversity have been demonstrated at different time, spatial and accuracy scales. In practice, technical recommendations should take into account this key element to manage hedgerows and other hedge habitats; this currently not the case.
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https://theses.hal.science/tel-00938190
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Submitted on : Wednesday, January 29, 2014 - 11:01:39 AM
Last modification on : Friday, October 23, 2020 - 4:50:47 PM
Long-term archiving on: : Wednesday, April 30, 2014 - 2:15:17 AM

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  • HAL Id : tel-00938190, version 1

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Stéphane Lecq. Importance de la structure des haies, des lisières, et de la disponibilité en abris sur la biodiversité, implications en termes de gestion. Sciences de l'environnement. Université de Poitiers, 2013. Français. ⟨NNT : ⟩. ⟨tel-00938190⟩

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