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Master Thesis

Trois méthodes d'évaluation pour l'expertise biodiversité d'un petit bois privé : application, comparaisons, complémentarités

Abstract : Nowadays the bad effect on biodiversity of the landscape standardization due to extensive agriculture is well known. Is there some biodiversity left in a small private wood isolated in inhospitable agricultural surroundings? Three evaluation methods have been used to realise a complete entomological biodiversity inventory of the Labroquère wood located in the "Coteaux de Gascogne". The first one is an indirect indicator based on the observation of wood structural parameters. This is the "Indice de Biodiversité Potentielle des peuplements" (IBP). The notation of different factors depending or not on the recent forest management allows to interpret the wood potential diversity. The second method is a new trapping strategy for entomological fauna emerged after winter. The method applied facilitate a stratified sampling by management method as well as a study of the distribution of wintering insects in the wood. The third evaluation method is a direct biodiversity indicator based on a Syrphid (Diptera, Syrphidae) inventory. Thanks to the expert system "Syrth the Net" these species can be compared to a list of expected species for the wood. This comparison allows to evaluate the role of the wood as a biodiversity reservoir. The result achieved is more complete and less biaised than with only one indicator. Each method brings a clue to the question. Shared results are confirmed and differences make the expertise more accurate. It contributes to a self controled strategy that takes into account a lot of factors and spatial scales. Consequently the studied wood has a high performance role of entomological fauna shelter as well as an entomological biodiversity reservoir. From an agronomical point of view the wood plays a neutral role beneficial insects and culture enemies being equally represented. One can find them at the edge of the wood. Other insects prefer the center of the wood. The wood exploitation has an impact on emergent species numbers as well as on their taxonomic diversity. One cutting in the wood contributes to develop medium term biodiversity and in particular it develops beneficial insects. The entomological biodiversity would be improved by cleaning the existing clearings and preserving old trees the beneficial insects being available for the culture around.
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Master Thesis
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Mathilde Redon. Trois méthodes d'évaluation pour l'expertise biodiversité d'un petit bois privé : application, comparaisons, complémentarités. Biodiversité et Ecologie. 2008. ⟨dumas-00356576⟩



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