AVIS-IBIS

Birds of Indian Subcontinent

Video Identification of Predators at Golden-Cheeked Warbler Nests / (Identificación mediante videos de depredadores de nidos de Dendroica chrysoparia)

Publication Type:Journal Article
Year of Publication:2004
Authors:Stake, MM, Faaborg, J, Thompson, III, FR
Journal:Journal of Field Ornithology
Volume:75
Issue:4
Date Published:2004
ISBN Number:02738570
Keywords:Accipiter, Accipiter cooperii, Accipitridae, Aphelocoma, Aphelocoma californica, Astur, Astur cooperii, Corvidae, Corvus, Corvus brachyrhynchos, Corvus corone, Cuculidae, Dendroica, Dendroica chrysopareia, Dendroica chrysoparia, Garrulus, Garrulus glandarius, Geococcyx, Geococcyx californianus, Icteridae, Molothrus, Molothrus ater, Niger, Parulidae, Setophaga, Setophaga chrysoparia
Abstract:We monitored 67 Golden-cheeked Warbler (Dendroica chrysoparia) nests with infrared video cameras and time-lapse recorders to identify predators. Rat snakes (Elaphe spp.) were the most frequent predators, depredating 12 nests and capturing three adult females. A variety of avian predators depredated seven nests, including three American Crows (Corvus brachyrynchos), two Brown-headed Cowbirds (Molothrus ater), one Western Scrub-Jay (Aphelocoma californicd), and one Cooper's Hawk (Accipiter cooperii). Fox squirrels (Sciurus niger) depredated four nests and were the only mammalian predators recorded. Post-outcome recordings (i.e., after young fledged or nests failed) revealed western coachwhips (Masticophis flagellum testaceus), mice (Peromyscus sp.), and Greater Roadrunners (Geococcyx californianus) as potential predators, though they were not recorded at active nests. Video proved to be an effective method of monitoring Golden-cheeked Warbler nests, because all but one predator was identified and only two nests (3%) were abandoned. /// Monitoreamos, con cámara infraroja de video y grabación por lapsos de tiempo, 67 nidos de la reinita Dendroica chrysoparia para identificar los depredadores. La culebra, Elaphe spp. resultó ser el depredador mas frecuente con 12 nidos, en donde atrapó a tres hembras adultas. Una variedad de aves depredadoras afectaron a siete nidos y a sus dueños. Entre estos tres cuervos (Corvus brachyrynchos), dos tordos (Molothrus ater), un azulejón (Aphelocoma californica) y un halcón (Accipiter cooperi). La ardilla Sciurus niger, fue el unico mamifero depredador, y fue responsable de la pérdida de cuatro nidos. La grabación, posterior a los pichones haber dejado el nido, reveló a Masticophis flagellum testaceus, Peromyscus sp. y a Geococcyx californianus como depredadores potenciales, aunque los mismos no fueron grabados en nidos activos. El uso de videos provó ser un método efectivo para monitorear nidos dado el caso de que en tan solo dos ocasiones las aves dejaron el nido (3%), y solo un depredador no pudo ser identificado.
URL:http://www.jstor.org/stable/4151224
Short Title:Journal of Field Ornithology
Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith