La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Movements by birds in Acacia savanna in southeast Botswana
Auteurs :	S. J. Tyler, Auteur
Type de document :	Article
Dans :	Ostrich (No number JUL 2001)
Article en page(s) :	98-103
Langues:	Anglais
Résumé :	In Botswana where rainfall is unpredictable and often highly localised, this results in resources being patchy. Many bird species are therefore nomadic to some degree. Movements of many, even common, species are, however, very poorly understood. This paper looks at patterns of movement in six species in mixed Acacia savanna at Ruretse in southeast Botswana using both transect and ringing data. Sedentary species such as Sabota Lark Mirafra sabota and Kalahari Scrub-robin Erythropygia poena typically had a high frequency of occurrence and were common on transects, but low numbers were ringed. There was some evidence for seasonality in occurrence for Namaqua Dove Oena capensis, Marico Sunbird Nectarinia mariquensis and Green-winged Pytilia Pytilia melba. One species showed erratic movements, apparently in response to rainfall,whilst two species clearly showed nomadic behaviour.

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