Abstract
Clearing of caldén (Prosopis caldenia) forests for agriculture and cattle raising in east-central La Pampa Province, central Argentina, has created a highly fragmented landscape, a condition that has resulted in adverse effects on birds in other forests, mainly through increased predation rates near forest edges. We evaluated bird nest predation rates using artificial nests, assessing the effects of forest fragment size, distance to the edge and nest height. We measured survival rate of 570 artificial nests located in trees, in bushes and on the ground, at different distances from the edge, in six forest fragments ranging in size from 2.1 to 117.6 ha, during two consecutive breeding seasons. Nest predation rates were significantly related with the number of days of exposition of the nest, nest height and distance to the edge, whereas fragment size and year of the experiment were not associated with predation rates. Ground nests were less likely to be predated than those located in bushes and trees. Predation rates decreased with the distance to the edge, showing a pattern consistent with the existence of an edge effect.
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Acknowledgements
We thank Violeta Poggio, Daniela Caldentey and Marcos Reyes for their valuable help during fieldwork and Lyn C. Branch for language correction. The Torroba’s family made this work possible by giving permission to carry out fieldwork in their ranch. We thank handling editor and the anonymous reviewers for their constructive comments which helped us to improve the manuscript. This study was supported by a grant (PI 020/RRNN) from the Departamento de Recursos Naturales, Facultad de Ciencias Exactas y Naturales, Universidad Nacional de La Pampa, and Sigma Xi Grant-in-Aid of Research, National Academy of Sciences. All research was conducted in accordance with Argentinean laws and guidelines.
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Sosa, R.A., Lopez de Casenave, J. Edge effect on bird nest predation in the fragmented caldén (Prosopis caldenia) forest of central Argentina: an experimental analysis. Ecol Res 32, 129–134 (2017). https://doi.org/10.1007/s11284-016-1421-4
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DOI: https://doi.org/10.1007/s11284-016-1421-4