Abstract

TETA, Pablo; LOPONTE, Daniel  and  ACOSTA, Alejandro. Late Holocene sigmodontines (Mammalia, Rodentia) from northeastern Buenos Aires province (Argentina). Mastozool. neotrop. [online]. 2004, vol.11, n.1, pp.69-80. ISSN 0327-9383.

Remains of fossil muroid rodents found in La Bellaca 2 (34° 22' 79" S - 58° 39' 53" O) and Las Vizcacheras (34° 16' 81" S - 58° 48' 65" O) archeological sites were studied. These samples are Late Holocene in age (1-0,6 ka), according to several radiocarbon dates.The assemblages are largely dominated by the amphibious orizomyne Holochilus brasiliensis with low frequencies of the akodontines Bibimys cf. B.torresi, Necromys sp., Oxymycterus rufus and Scapteromys cf. S. aquaticus-S. tumidus. Samples of fossil muroids from the late Holocene in northeastern Buenos Aires wetlands are extremely isolated and chronologically limited. The scarce species registered in the archeological sites suggest climatic conditions similar to the present ones in the area. The sigmodontine fauna from la Bellaca II and Las Vizcacheras indicates an environment dominated by marshes, small fresh-water bodies, flooded grasslands and grass steppes.

Keywords : Pampean Region; wetlands; Sigmodontinae; palaeoenvironments; taphonomy.

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