Keywords
Argentina
conservation
grasslands
tree plantations
trophic guilds
Abstract
Little attention has been paid to the seasonal variation of bird assemblages using crop edges. The objective of this study is to analyze the use of different types of crop edges during winter and spring in southeastern Buenos Aires Province, Argentina. We recorded a higher use of edges during spring, although some bird species made a higher use of field interior in winter. Edges with trees and natural grasslands were the most used in both seasons. Field edges with trees were more used by insectivorous birds during spring, whereas edges with natural grasslands were more used by granivorous birds in winter. Edges had higher species richness in spring, whereas bird abundance was higher in spring only in edges with trees and in edges surrounded by crops. The similarity of bird assemblages was related with the similarity in the structure of the different types of crop edges. Our results show that management policies should consider the seasonality and the differences in the composition of bird assemblages in the different types of edge.
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