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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Arthropod responses to harvesting and wildfire: Implications for emulation of natural disturbance in forest management
Auteurs :	C. M. Buddle, Auteur ; D. W. Langor, Auteur ; G. R. Pohl, Auteur ; J. R. Spence, Auteur
Type de document :	Article
Dans :	Biological Conservation (128(3) MAR 2006)
Article en page(s) :	346-357
Langues:	Anglais
Résumé :	Although natural disturbance has been widely adopted as a template for forest management that protects biodiversity, this hypothesis has not been adequately tested. We compared litter-dwelling arthropod assemblages (Coleoptera: Carabidae and Staphylinidae; Araneae) in aspen-dominated stands originating as clear-cuts or wildfires across three age classes (1-2, 14-15, and 28-29 years old) to test whether the post-harvest and post-fire assemblages converged following disturbances, and to compare faunal succession. These findings were compared to data about epigaeic arthropods in old and mature pyrogenic aspen stands (> 70 years old) to determine whether diversity and community composition of arthropods from the younger age-classes approached what may have been typical predisturbance conditions. The resulting data-set of almost 27,000 arthropods and 230 species showed convergence in most taxa, and some general similarities between 28- and 29-year-old stands and old and mature stands. However, not all taxa responded similarly, and faunal succession following clear-cutting appeared to progress more rapidly than following wildfire. Rarefaction-estimated diversity was elevated in 1-2-year-old stands, compared to unharvested stands, reflecting a mix of closed-canopy and open-habitat species. Nonmetric multi-dimensional scaling ordinations showed that samples from young wildfire disturbed stands (1-2 years old) included more variable assemblages than all other study sites, and contained species that may depend on unique post-fire habitat characteristics. The fauna of old and mature stands exhibited low diversity, but contained species with limited dispersal abilities, and species tied to old-growth habitats such as dead wood. Harvesting systems that do not allow adequate recovery following a first harvesting pass, or do not maintain microhabitat features associated with older fire-origin forests, may threaten persistence of some elements of boreal arthropod faunas. (c) 2005 Elsevier Ltd. All rights reserved.

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