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The changes in abundance of three species of lizards were determined and compared between grazed and ungrazed desert scrub near La Paz, in the Cape Region, Baja California Sur, Mexico, from April 1992 to March 1993. A total of 54 censuses were taken of these species over two transect systems, one inside and one outside livestock enclosure. Urosaurus nigricaudus were negatively affected by the grazing activities, but Uta stansburiana exhibited an apparently positive effect by such activities. Cnemidophorus hyperythrus population apparently showed no effect by the livestock grazing. The paper discusses the possible relationship between the microhabitat specificity of each species and their population number individuals response. Os cambios na reproduo de 3 especies de lagartixas foram definidos e tem sido comparados em dois sitios de matos deserticos: um de pastoreado e o outro no, localizados nos arrededores Cidade de La Paz, na Regio del Cabo na Baja California Sur no Mexico, no lapso de abril de 1992 ao maro de 1993. Foram desenvolvidos um total de 54 censos para as tres espcies com base ao sistema de "dois transectos" - quer dizer: um dentro e o outro fora da excluso de gado. O resultado foi: uma lagartixa foi negativamente afectada pelas actividades de pastoreo. Uma outra mostra um aparente efecto positivo pelas mesmas condies e a terceira, no mostro alterao nehuma pelo pastoreo. Este artgo pe em causa, as posiveis relaes entre a especificidade do microhabitat de cada uma das espcies e a sua resposta de abundncia no numero de indivduos

Changes in lizard abundance on protected versus grazed desert scrub in Baja California Sur, Mexico