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Écologie et biocénoses des coléoptères saproxyliques dans quatre forêts du nord des Alpes françaises

Abstract : Saproxylic beetles are strongly related on the dead wood and the heterotrophic phase of the forest cycle. This situation places them in direct competition with the human forest management. The conservation of these animals and their ecological functions needs an increased knowledge on their biologies and the relations which they maintain with the dead wood and the forest.

In this work we have analyzed the autecologic and synecological relations established between the saproxylic beetles and the types of dead wood within 3 forest types of the French Alps (10 stations). Dead wood was studied by a method derived from the European protocol COST E4 while the saproxylic beetles were sampled by window traps.

The existence of communities of saproxylic beetles at the forest level is confirmed by ANOSIM and correspondences analyze (CA). Communities compositions are documented by clusters, CCA and RDA. PCA and multiple linear regressions permit to identify 3 major environmental factors which determine these faunisitical groups. They are, in order of importance: a dichotomy between leafy and resinous dead wood, a gradient of dimension-position (combining size, origin of death and position on the soil), and finally, a gradient of wood disorganization (gathering bark surface, decomposition classes and type of rot).

The historical continuity of the dead wood, estimated with a dead wood profile, has a significant impact on the diversity of the rarest taxa, which confirm preceding observations and, again, raises the question of the long-term impact of the forestry activites on the biodiversity.
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https://tel.archives-ouvertes.fr/tel-00203673
Contributor : Benoit Dodelin <>
Submitted on : Thursday, January 10, 2008 - 10:24:24 PM
Last modification on : Friday, November 6, 2020 - 3:33:48 AM
Long-term archiving on: : Tuesday, April 13, 2010 - 5:00:40 PM

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  • HAL Id : tel-00203673, version 1

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Benoit Dodelin. Écologie et biocénoses des coléoptères saproxyliques dans quatre forêts du nord des Alpes françaises. Ecologie, Environnement. Université de Savoie, 2006. Français. ⟨tel-00203673⟩

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