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Habitat use by Swainson's Hawks on their austral winter grounds in Argentina

Journal of Raptor Research

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Abstract

We examined the use of agricultural habitats by Swainson's Hawks (Buteo swainsoni)in La Pampa and Santa Fe provinces, Argentina. We found an association of foraging Swainson's Hawks with permanent pastures such as fallow, natural, and alfalfa fields. The hawks also used plowed fields for sunning, resting, and preening. Fields planted with annual crops and pastures were used very little, except when they were cut for hay, plowed, and harvested, or when low crop height and cover allowed the hawks to land in fields. The availability of abundant, yet widely-spaced and transient food-sources, such as insect outbreaks, appeared to be the principal factor influencing habitat use by the hawks. Their reliance on agricultural habitats makes Swainson's Hawks highly vulnerable to pesticide contamination and has contributed to the occurrence of significant mortality events on their wintering grounds.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Habitat use by Swainson's Hawks on their austral winter grounds in Argentina
Series title:
Journal of Raptor Research
Volume
37
Issue:
2
Year Published:
2003
Language:
English
Contributing office(s):
Forest and Rangeland Ecosystem Science Center
Description:
p. 125-134
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
125
Last page:
134
Number of Pages:
10