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01.04.2013 | Original Paper | Ausgabe 4/2013

Biodiversity and Conservation 4/2013

Explaining the saproxylic beetle diversity of a protected Mediterranean area

Zeitschrift:
Biodiversity and Conservation > Ausgabe 4/2013
Autoren:
Estefanía Micó, Alejandra García-López, Hervé Brustel, Ascensión Padilla, Eduardo Galante
Wichtige Hinweise

Electronic supplementary material

The online version of this article (doi:10.​1007/​s10531-013-0456-x) contains supplementary material, which is available to authorized users.

Abstract

Saproxylic beetle diversity is high at the Cabañeros National Park (central Spain), where woodland habitats exhibit remarkable heterogeneity. Our aim was to explain the diversity of saproxylic beetles, focusing on species turnover among mature woodland types. We surveyed five woodland types that represented the heterogeneity of the park’s woodland habitats. Beetles were collected using window traps over a period of 20 months. The Jaccard Similarity Index was used as indirect value of beta diversity among woodlands and to test the relation between species turnover and geographical distance. We also identified the contribution of species turnover to landscape diversity by using a partitioning model. Moreover, the presence of mixed woodlands (more than one tree species) allowed us to attempt to valorise the effect of tree species (coupled with their historical management) on species turnover among woodlands. Finally, we looked for different saproxylic beetle preferences for habitat and tree species using an indicator value method. We found that saproxylic beetle species composition varied significantly among the studied woodlands. The variation in species turnover was independent from the distance among woodlands, which suggested that beetle dispersal abilities could not explain this high turnover. Tree species within woodlands were a key factor that increased diversity turnover in woodlands and, consequently, the diversity of the park. Moreover, we found saproxylic beetle species that had different habitat and tree species preferences. We conclude that woodland heterogeneity (highly affected by woodland composition) seems to be the driving force for saproxylic beetle diversity in this protected area.

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