Use of Mainland Habitats by Supposed River-Island Obligate Birds Along the Amazon River in Peru

[摘要] Abstract. Eighteen species of Amazonian birds have been considered river-island obligates in northeastern Peru, but some of these species have been detected recently at mainland sites along the Amazon River. We document the presence of supposed river-island obligate birds at riparian sites on the mainland and characterize these birds' habitat use on the islands and the mainland on the basis of point counts at five island sites, five riparian mainland sites, and five upland mainland sites. We regularly encountered seven species of supposed river-island obligates on the islands and four of them, including the Ash-breasted Antbird (Myrmoborus lugubris), Black-and-white Antbird (Myrmochanes hemileucus), Castelnau's Antshrike (Thamnophilus cryptoleucus), and Fuscous Flycatcher (Cnemotriccus fuscatus), also occurred regularly at the riparian mainland sites, but none occurred at the upland mainland sites. These four species are primarily birds of early-successional scrub or forest, but they also used agricultura...

[学科分类] 动物科学

[关键词] habitat specialization;habitat colonization;agricultural disturbance;river islands;river-island obligates;Amazonia;Peru