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Ecologie des coléoptères saproxyliques : Biologie des populations et conservation d'Osmoderma eremita (Coleoptera : Cetoniidae)

Abstract : Saproxylophagous insects are an important part of the biodiversity of temperate forests and play a fundamental biogeochemical role being involved in the degradation of dead wood. The European saproxylic complex is now disrupted by anthropogenic changes in forests. Many species of this complex are endangered and their conservation necessitates understanding the causes of their vulnerability. We studied the ecology of a cavity-dwelling saproxylophagous beetle, Osmoderma eremita, a species that is becoming scarce throughout its range and has low dispersal capacities. We monitored its populations by capture-recapture and radio-tracking. Additional measures were undertaken in the laboratory (flight-mill). Our objectives were to explain the distribution of the species in an agricultural landscape, to study its dispersal capacities and to analyze its other demographic characteristics. We have revealed the influence of openness and of the density of microhabitats on the presence of the species, with a preference for areas that have suffered the smallest loss of habitat within 60 years. We measured dispersal capacities that were three times greater than those observed in nature. The capacities of females were related to their condition. The demographic analysis revealed biased sex-ratios depending on population and year. We have demonstrated the role of sex in the demography of the species, a factor which should take place in viability analyses. Such analyses enable to propose conservation measures for O. eremita adaptable to other saproxylophagous species.
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Submitted on : Thursday, April 15, 2010 - 4:20:48 PM
Last modification on : Monday, April 29, 2019 - 2:30:45 PM
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  • HAL Id : tel-00473556, version 1

Citation

Glenn Dubois. Ecologie des coléoptères saproxyliques : Biologie des populations et conservation d'Osmoderma eremita (Coleoptera : Cetoniidae). Ecologie, Environnement. Université Rennes 1, 2009. Français. ⟨tel-00473556⟩

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