Abstract
Carnivores control their territory by locating their scent marks and responding to marks left by homo or heterospecific intruders, being re-marking one of the possible answers. In order to investigate the possible factors that trigger re-marking (local nature of the intruder, phylogenetic closeness, similarity in the diet), we studied in Monte de Valdelatas (Madrid) , from January to October 2005, the response of foxes to faeces from diverse species, introduced into its territory: common genet (Genetta genetta), bush dog (Speothos venaticus), leopard (Panthera pardus) and nilgai (Boselaphus tragocamelus). The analysis showed significant differences only between the responses to faeces from nilgai and leopard, in three of the four routes selected for the study. Neither local/non local character of donor species nor its degree of kinship with the fox influenced significantly in the results. The only clear trend was that the response was all the more intense the more carnivore was the donor species.
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