Resumen

COURTALON, Paula; LO COCO, Gastón  y  BO. Presencia de Holochilus chacarius Thomas, 1906 (Mammalia, Rodentia, Sigmodontinae) en el Delta Medio del río Paraná, Entre Ríos, Argentina. Rev. Mus. Argent. Cienc. Nat. [online]. 2013, vol.15, n.2, pp.289-293. ISSN 1853-0400.

We describe the presence of Holochilus chacarius in the Victoria Island Zone included in the Middle Delta of the Paraná River (Entre Ríos, Argentina). We collected and analysed pellets of the Striped Owl (Pseudoscops clamator). All cranio dental items that were identified and measured belong to the Chaco Marsh Rat. We postulate that its occurrence is becoming less casual and is associated with the high climate variability and extreme events of flooding and drought that have affected the area in recent years. These events would favour the ingression and eventual establishment of these rodents in the study area.

Palabras clave : Holochilus chacarius; Sigmodontinae; Middle Delta of the Paraná River; Entre Ríos; Argentina.

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