Seasonal changes in bird assemblages of a forest-steppe ecotone in North Patagonia

CUETO, V.R.; GOROSITO, C.A.

ORNITOLOGIA NEOTROPICAL

NEOTROPICAL ORNITHOLOGICAL SOC

Lugar: ALEMANIA; Año: 2018 vol. 29 p. 349 - 358

1075-4377

Abstract ∙ We studied seasonal variation in a community of birds inhabiting a forest?steppe ecotone of north Patagonia. We analyzed changesin species richness, species composition and total abundance, and, at the species level, we evaluated differences in breeding and moltingseasonality. The bird assemblage showed a low seasonal variation in richness and total abundance, but a great change in species compositionbetween spring?summer and fall?winter. The change in species composition did not lead to changes in richness and total abundance, due tothe presence of abundant species that visit the area in different seasons. At the species level, resident birds and short distance migrantstended to begin breeding earlier than long distance migrants, and those bird species began to molt body and flight feathers after breeding.Therefore, we found a low overlap between these two energetically demanding activities. Elaenia albiceps, the only long-distance migrantspecies, did not molt body and flight feathers in our study area. Our results highlight the importance of bird movements in response to seasonalvariations in the availability of resources, which promote migration or local displacements of birds.