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Universidad de Buenos Aires (2016)

Vegetation structure and food influence in the space use by granivorous birds in the central Monte Desert

Zarco, Agustín

Titre : Vegetation structure and food influence in the space use by granivorous birds in the central Monte Desert

Influencia de la estructura de la vegetación y del alimento sobre el uso del espacio por las aves granívoras del desierto del Monte Central

Auteur : Zarco, Agustín

Université de soutenance : Universidad de Buenos Aires

Grade : Doctor en el área de Ciencias Biológicas 2016

Résumé
Birds behaviour could be differently influenced by changes in food abundance and habitat structure, depending on dietary restrictions and resources use. In these study was analyzed how those factors modified the use of space of three seed-eating birds in the central Monte desert during the breeding and non- breeding seasons : Zonotrichia capensis, a granivorous generalist, Saltatricula multicolor, a grass specialist, and Poospiza torquata, a grass specialist in the non-breeding season. During the breeding season and considering at an habitat scale, S. multicolor increased their territorial area due to the lack of food abundance and tree cover, while Z. capensis did not. At a microhabitat scale, there was no difference in song perch selection for any species besides the vegetation structure differences between environments. On the other hand, during the non-breeding season the movement patterns of young individuals and natal dispersal differed among species : S. multicolor shows a delayed natal dispersal and Z. capensis and P. torquata leaved their natal area after the nutritional dependence period. The structure of wintering flocks was affected by food abundance : size and seed-eating birds proportion in the flocks dimished with food decrease. This study results suggest that in the central Monte desert, food and habitat structure affect the space use, being species-specific and depending on bird characteristics.

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Page publiée le 19 juillet 2017