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Dispersion et persistance de la biodiversité dans la trame forestière (DISTRAFOR)

Abstract : Establishing a functional forest network allowing species dispersal and migration requires identifying which species have limited dispersal abilities and which landscape configurations are deleterious. The Distrafor project studied the influence of forest connectivity on ground flora, saproxylic and carabid beetles and soil fauna, accounting for variations in habitat quality. Existing data and data gathered for this project (including forest mapping from ancient maps) were used to compare species assemblages in ancient and recent forests. The results showed that almost half plant species react to the age of the forest, partly because of differences in soil type. The proportion of plant species really limited by dispersal is likely to be lower, but complementary analyses are needed. Those species responded to an increase in forest cover in particular in deforested areas, such as intensively farmed and urban areas. The positive effect is much more marked when recent forest enlarge an ancient one. Naturalized plants do not seem to be particularly positively advantaged by connectivity. In farmed areas, the species composition of saproxylic and carabid beetles differed between recent and ancient patches but were related neither to the quality of forest patches, nor to their connectivity. A lower diversity was even observed in the most forested areas. Some beetle species seem to compensate for an increased forest fragmentation by higher dispersal abilities. On the same sites, soil macrofauna was influenced by these factors, but the response depended on the taxa and the region considered. These results show that connectivity should be restored primarily in the most deforested areas. In parallel, the most fragile forest habitats need to be preserved or restored, as biodiversity seems more often limited by the habitat quality than by its connectivity.
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https://hal.inrae.fr/hal-02801386
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Submitted on : Friday, June 5, 2020 - 8:47:49 PM
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  • HAL Id : hal-02801386, version 1
  • PRODINRA : 291865

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Frédéric Archaux, Laurent Bergès, Christophe Bouget, Antoine Brin, Sandrine Chauchard, et al.. Dispersion et persistance de la biodiversité dans la trame forestière (DISTRAFOR). Ministère de l'Ecologie et du Développement Durable (MEDD). 2014. ⟨hal-02801386⟩

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