Internal parasites of free-ranging guanacos from Patagonia

In the winter of 2000, a greater than 80% reduction in the guanaco population located in Cabo Dos Bah´ oas Wildlife Reserve, Chubut, Argentina, was evident due to massive mortality attributed to starvation. Twelve guanacos were necropsied and samples were analyzed at the Parasitology Laboratory of Facultad de Ciencias Veterinarias, Universidad Nacional del Litoral. Fecal analysis revealed developmental stages of Nematodirus sp., Marshallagia sp., Trichuris sp. and Eimeria spp. Histopathological analysis showed the presence of Sarcocystis sp. in muscle and fascia cysts. Other parasites recovered included Dictyocaulus filaria , Trichuris tenuisand Moniezia expansa .O f these, D. filariaand M. expansa possibly reflect interactions with domestic sheep. This is the first time that T. tenuis has been reported in guanacos. © 2003 Elsevier B.V. All rights reserved.