Occurrence of migratory birds in an urban forest fragment in Rio Branco, Acre, Brazil

Migratory birds abandon their breeding sites to travel long distances, stimulated by a scarcity of feeding resources, associated with climatic factors and other, endogenous variables. In between August 2016 and May 2017 to detect and identify the bird species that use this area as part of their migratory routes. The area called Campus and zoobotanical park of the Federal University of Acre are located in the urban zone of Rio Branco, in the southwestern Amazon, Acre, Brazil. During the study period, a total of 22 migratory species were detected, originating from number of different parts of the Americas. of these species, 10 (45.45%) are austral migrants (Porphyrio flavirostris, Sporophila lineola, Elaenia parvirostris, Elaenia spectabilis, Griseotyrannus aurantioatrocristatus, Pyrocephalus rubinus, Tyrannus savana, Tyrannus albogularis, Sublegatus modestus, and Vireo chivi), seven (31.82%) are Nearctic migrants (Buteo swainsoni, Pandion haliaetus, Actitis macularius, Calidris melanotos, Tringa flavipes, Tringa solitaria, and Calidris fuscicollis), three (13.64%) are intratropical migrants (Chrysolampis mosquitus, Columbina picui, and Sporophila bouvronides), and two (9.09%) are regional migrants (Amazonetta brasiliensis and Dendrocygna viduata). The order represented by the most species was the Passeriformes (n=10;45.45%), followed by the Charadriiformes (n=5;22.73%), Accipitriformes (n=2;9.09%), Anseriformes (n=2;9.09%), Apodiformes (n=1;4.55%), Columbiformes (n=1;4.55%), and Gruiformes (n=1;4.55%). The largest number of records were collected for Tringa solitaria, which was observed between September 2016 and February 2017. The systematic monitoring of the region’s migratory birds contributed to the understanding of migration patterns (timing of arrival, duration of stay), as well as establishing georeferenced points on the route of each species.