Abstract

The distribution of the coypu (Myocastor coypus) in the Iberian Peninsula is restricted to the Atlantic region, even though recent data suggest an expansion into the western part of the Basque Autonomous Community (northern Iberian Peninsula). With the aim of providing new data on coypu distribution in this region, 76 transects (mean length = 1369 m; range = 900-1800 m) along riverbanks and marsh shorelines were surveyed, to record the presence of coypus by means of their signs: footprints, burrows, and droppings. Transects were distributed in 14 river basins, corresponding to 45 UTM 10x10 km squares. Between January and September 2004, we detected 105 activity signs in 4 river basins, verifying the presence of the species in 10 UTM squares. Our results confirm that the coypu is expanding into new areas in the north of the Iberian Peninsula.

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