La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Feeding on the edge: foraging White Ibis target inter-habitat prey fluxes (2019)
Titre original:	Feeding on the edge
Auteurs :	Erin E. Binkley, Auteur ; Nathan J. Dorn, Auteur ; Mark I. Cook, Auteur
Type de document :	Article
Dans :	Journal of Field Ornithology (90(3) 2019)
Article en page(s) :	235-247
Langues:	Anglais
Mots-clés:	Eudocimus albus ; numerical response ; prey availability hypothesis ; prey pulse ; restoration
Résumé :	Avian population dynamics are influenced by the availability of spatiotemporally variable prey resources, but the conditions producing abundant and accessible prey are not always clear. In the Florida Everglades, wading birds nest in the dry season when receding water levels concentrate prey and facilitate improved foraging efficiency. White Ibis (Eudocimus albus) feed extensively on crayfish in sloughs, and previous studies have demonstrated that crayfish move downgradient from higher elevation, heavily vegetated ridge habitats into adjacent less-vegetated sloughs when ridges are almost dry. Most White Ibis foraging is thought to occur in sloughs with relatively shallow water ( 25 cm), we found that White Ibis will forage on crayfish in water at those depths. Maintenance of habitat elevational differences and hydro-patterns that promote crayfish production will be necessary to promote this predator–prey interaction in the ridge-slough landscape of the Everglades.
En ligne :	https://onlinelibrary.wiley.com/doi/abs/10.1111/jofo.12302

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