La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Nest protectors provide a cost-effective means of increasing breeding success in Giant Ibis Thaumatibis gigantea
Auteurs :	Omaliss Keo, Auteur ; Nigel J. Collar, Auteur ; William J. Sutherland, Auteur
Type de document :	Article
Dans :	Bird Conservation International (19(1) MAR 2009)
Article en page(s) :	77-82
Langues:	Anglais
Résumé :	A main cause of nestling loss of the 'Critically Endangered' Giant Ibis Thaumatibis gigantea appeared to be mammalian predation. Predator-exclusion devices were added to a randomly selected half of 52 nesting trees, with the other half acting as controls. The number of young fledged per nest was 50% higher for protected nests than control nests. Each protected nest produced almost two-thirds (0.63) of an extra chick. During the nestling period, the daily nestling survival rate was (99.9%) (equivalent to 90% survival over the nestling period) for protected nests and 99.3% (61.3% survival over the whole period) for control nests. Nest protection devices cost US$(5) per tree. Each extra nestling fledged as a result of this intervention therefore cost $8. if it was also necessary to pay to locate the nests, then the cost of protecting each nest would be $(140) and the cost of producing each extra chick $(224). Trees with protectors added were significantly more likely to be reused in the next year than unprotected trees.

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