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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Altered herb assemblages in fragments of the Brazilian Atlantic forest
Auteurs :	Patricia B. Lima, Auteur ; Liliane F. Lima, Auteur ; Braulio A. Santos, Auteur ; Marcelo Tabarelli, Auteur ; Carmen S. Zickel, Auteur
Type de document :	Article
Dans :	Biological Conservation (191 NOV 2015)
Article en page(s) :	588-595
Langues:	Anglais
Résumé :	Understanding the response of tropical plant communities to human disturbance is critical for conserving biodiversity in a changing world. Here we examine the shifts experienced by understory herb-assemblages while inhabiting small forest fragments in a fragmented Atlantic forest landscape to infer about community-level shifts imposed by either habitat loss or fragmentation. We established 100 25-m(2) plots, placed randomly in 10 forest fragments and 10 forest interior patches, in which all herb species were recorded, litter accumulation, soil temperature and moisture were estimated. We recorded a total of 6027 herbs belonging to 134 species, with a predominance of ferns, grasses, aroids, sedges and calatheas. Forest fragments and forest interior exhibited similar densities of herbs: 64.4 57.8 herbs/25 m(2) vs. 56.1 44.1, respectively. Species richness was reduced by a half in forest fragments at plot and habitat spatial scales. Fragments were particularly impoverished in terms of ferns, aroids and calatheas, but supported a subset of proliferating native herbs and indicator/exclusive species; i.e. a taxonomically and ecologically distinct herb flora. Fragments also supported less humid soils covered by a thicker litter layer and these attributes correlated to species distributions in both forest habitats. Our results suggest that habitat loss and fragmentation, particularly the-establishment of illuminated and desiccated forest edges, result in the extirpation of particular ecological groups with a few species/ecological groups experiencing proliferation, such as light-demanding species. Collectively, these processes result in impoverished/altered assemblages at multiple spatial scales, potentially limiting the conservation services provided by humanmodified landscapes. (C) 2015 Elsevier Ltd. All rights reserved.

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