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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Tree-cavity availability and selection by a large-bodied secondary cavity-nester: the Military Macaw (2015)
Titre original:	Tree-cavity availability and selection by a large-bodied secondary cavity-nester
Auteurs :	Sylvia Margarita de la Parra-Martínez, Auteur ; Katherine Renton, Auteur ; Alejandro Salinas-Melgoza, Auteur ; Luis Guillermo Muñoz-Lacy, Auteur
Type de document :	Article
Dans :	Journal of Ornithology (156(2) 2015/01/13)
Article en page(s) :	489-498
Langues:	Anglais
Résumé :	Large-bodied secondary cavity-nesters are constrained to use cavities of sufficient size to permit access, while also selecting characteristics to reduce predation. However, no information exists on nest-site availability for large-bodied secondary cavity-nesters in tropical forests. We located 12 tree-cavity nests of the threatened Military Macaw (Ara militaris) in tropical dry semi-deciduous forest in Jalisco, Mexico. For each nest, we determined cavity characteristics, and compared the structure of nest-trees with nearest-neighbor trees. We also established four 100 × 50 m transects in each of deciduous, semi-deciduous, and oak forest to determine tree-cavity availability over 6 ha. Military Macaw nest-sites occurred most frequently in cavities of live Enterolobium cyclocarpum trees. Nest-trees had significantly larger diameter and ramification height than the four nearest-neighbor trees, indicating that macaws selected tall emergent trees as nest-sites. Cavities used as nest-sites by Military Macaws were also in significantly larger trees, at a greater height, and had larger entrance diameter and depth than all accessible cavities. Height above the ground was the main criteria predicting nest-cavity selection, possibly to reduce predation risk. There was also a negative correlation of nest-cavity height with depth, suggesting a trade-off in which Military Macaws may select a nest-cavity high above the ground regardless of depth, but when using lower cavities these tend to be deeper. We found a low density of cavities with characteristics suitable for nesting, and these were concentrated in semi-deciduous forest. Our results demonstrate that the Military Macaw exhibits species-specific selection of nest-cavities, with a low density of cavities suitable for large-bodied secondary cavity-nesters in tropical forests.
En ligne :	http://link.springer.com/article/10.1007/s10336-014-1150-9

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