Comparison of the diet of the Chimango Caracara (Milvago chimango) and the Burrowing Owl (Athene cunicularia) in a peri-urban site of central Chile

Authors

DOI:

https://doi.org/10.28947/hrmo.2020.21.2.497

Keywords:

arthropods, central Chile, dietary overlap, garbage, pellets.

Abstract

Trophic differentiation among raptors plays an essential role in their coexistence, a situation that becomes especially problematic when there is a transformation of the habitat, leading to changes in the availability of resources. In December 2018 we examined the diet of Milvago chimango and Athene cunicularia in central Chile, in an area close to a landfill in Montenegro. We collected 226 pellets of M. chimango and 68 pellets of A. cunicularia, and observed that both species concentrated a high proportion of their prey around arthropods (mainly class Insecta, with 54% and 64% for M. chimango and A. cunicularia, respectively), with variations in the consumption of the different orders and families in each case. Both raptors had differences in the consumption of birds (5.36% for M. chimango and 1.42% for A. cunicularia) and mammals (2.53% for M. chimango and 7.13% for A. cunicularia). Both species also showed a high dietary overlap (S = 0.94). The spatial and hunting differences of each species have resulted in mechanisms that would explain their coexistence in the study area.

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Published

2020-07-08

How to Cite

Zúñiga, A. H., & Subercaseaux, F. M. (2020). Comparison of the diet of the Chimango Caracara (Milvago chimango) and the Burrowing Owl (Athene cunicularia) in a peri-urban site of central Chile. Huitzil Revista Mexicana De Ornitologí­a, 21(2). https://doi.org/10.28947/hrmo.2020.21.2.497

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