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Gestion forestière et biodiversité, les enjeux de conservation d'une espèce parapluie : Limoniscus violaceus (Coleoptera)

Abstract : The Violet Click Beetles - Limoniscus violaceus (Müller, 1821) - is a coleopteran species living within wood mould of hollow trees. Endangered in Europe, it is included in Annex II of the "Habitats" directive that aims to ensure the preservation of habitats and species of Community interest through the Natura 2000 network. Managers of this kind of area must consequently guarantee the favorable conservation status of the species. However, difficulties for detecting the species have limited the accumulation of knowledge about its biology and its ecology. This weakness has motivated this doctoral thesis. First, all data relative to the species' distribution are compiled. 184 localities in 17 countries are given. Several discordances with Natura 2000 data are highlighted. A survey method using emergence traps is developed and tested in 5 French Natura 2000 areas. A predictive model of the presence of Limoniscus violaceus based on two factors easy to handle (the degree of hollowing of the cavity and the circumference at 30 cm height) is identified. The study of these factors' thresholds and their confidence intervals leads to a decision rule for the assessment of habitats favorable to Limoniscus violaceus. Meanwhile, analysis of the composition of assemblages of species sampled result to the determination of 231 saproxylic beetles. Preservation of cavities favorable for Limoniscus violaceus appears beneficial for the majority of them, justifying it potentially being an umbrella species. For further prospection, a list of indicator species is identified. It helps to prioritize areas where monitoring of hollow trees and Limoniscus violaceus should be considered. Study of the dispersal from results of emergence traps crossed with bibliographic knowledge suggests that average population size is around 10 adults with 3 individuals dispersing per cavity each year. Sex-Ratio analysis gives complementary information about the functioning of the species populations. Finally, a case study of conservation strategy in the Forest of Grésigne is presented. To ensure the recruitment of trees that will guarantee the long term persistence of the species, management guidelines are given, based on the current forest management plan and on the results of a study on the origin of cavities.
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  • HAL Id : tel-00824627, version 1

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Nicolas Gouix. Gestion forestière et biodiversité, les enjeux de conservation d'une espèce parapluie : Limoniscus violaceus (Coleoptera). Biodiversité. Université Pierre et Marie Curie - Paris VI, 2011. Français. ⟨NNT : 2011PA066145⟩. ⟨tel-00824627⟩

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