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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Birds of a feather flock together: Using trait-groups to understand the effect of macropod grazing on birds in grassy habitats
Auteurs :	Brett W. A. Howland, Auteur ; Dejan Stojanovic, Auteur ; Iain J. Gordon, Auteur ; Jim Radford, Auteur ; Adrian D. Manning, Auteur ; David B. Lindenmayer, Auteur
Type de document :	Article
Dans :	Biological Conservation (194 FEB 2016)
Article en page(s) :	89-99
Langues:	Anglais
Résumé :	Restoration of appropriate disturbance regimes is a high conservation priority. However, for most species, little is known about appropriate disturbance regimes to achieve defined conservation outcomes. In this context, trait based approaches can offer a means to generalize responses to environmental change across multiple species. Here, we investigated the potential of a trait-based approach to predict the preference of birds utilizing the grassy layers for different levels of grazing by a native grazer within grassy habitats in south-eastern Australia. We tested three hypotheses: 1) birds with particular traits (i.e. large ground-foraging, small ground-foraging, aerial insectivore, and ground-nesting/concealment) will show preferences for certain levels of grazing: 2) species within the same trait group will show preferences for a similar level of grazing intensity: and 3) different bird trait groups will favor different grazing intensities Overall, we found a significant relationship between grazing intensity and the richness of aerial insectivore and large ground-foraging trait groups utilizing the grassy layer, but not for the richness of small ground-foraging and ground-nesting/concealment trait groups. We also found that the likelihood of 3/3 aerial insectivores, 4/7 large ground-foragers, 3/10 small ground-foragers, and 1/3 ground-nesting/concealment species using the grassy layer was significantly related to grazing intensity. However, we found no significant relationship between the probability of

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