Short communicationRodents from southern Patagonian semi-arid steppes (Santa Cruz Province, Argentina)
Introduction
When Charles Darwin travelled along the Santa Cruz River (Santa Cruz Province, Argentina) during the months of April and May of 1834, he wrote in his diary: “Patagonia, poor as she is in some respects, can however boast of a greater stock of small rodents than perhaps any other country in the world. Several species of mice are externally characterised by large thin ears and a very fine fur. These little animals swarm amongst the thickets in the valleys, where they cannot for months together taste a drop of water excepting the dew” (Darwin, 1989 [1839]). As a result of the expedition between the mouth (Atlantic Ocean, 68°W) and the upper course of Santa Cruz River (near the Andean Cordillera; 71° W), Darwin collected the types of Mus micropus Waterhouse, 1837 (=Loxodontomys micropus), Mus xanthopygus Waterhouse, 1837 (=Phyllotis xanthopygus), Mus xanthorhinus Waterhouse, 1837 (=Abrothrix olivaceus), and Reithrodon cuniculoides Waterhouse, 1837 (=Reithrodon auritus). For the following 60 years, the knowledge of the small mammal communities from Santa Cruz Province has remained in a static situation. Between 1890 and 1920, another scientific expeditions reached the southern extreme of the Santa Cruz Province, exploring the western mountain ranges and the adjoining steppes or the Atlantic coast (e.g., Princeton Expedition to Patagonia [1896–1899]; J. Pemberton, for the Museo Argentino de Ciencias Naturales [1914–1915]; E. Budin for the British Museum of Natural History [1927–1928]). On the other hand, the widely extended semi-desert steppes along the course of the Santa Cruz River have remained virtually unexplored since the Darwin's voyage, near 170 years ago.
In this paper, we studied the mammalian fauna along the Santa Cruz and La Leona rivers and the areas of Lago Argentino and Lago Viedma (Santa Cruz province, Argentina), based on trapping data and analysis of owl pellets collected in several localities. Fieldwork was largely conducted during 2004 and 2005.
Section snippets
Study area and methods
The study area is mostly included in an ecotone between the dwarf shrub steppes of Nassauvia glomerulosa, Nassauvia ulicina and Chuquiraga aurea (locally known as eriales) and the shrubby steppes of Junellia tridens of the Central District of the Patagonian Phytogeoghapic Province (León et al., 1998) (Fig. 1). Towards the south and west, these formations are intermixed with the herbaceous steppes of the Subandean District of the same phytogeographic province. Climate is cold and semi-arid, with
Results and discussion
Thirty-nine individuals of seven species were recorded in a total of 753 trap nights (Table 1). A. olivaceus (Waterhouse, 1839) and Eligmodontia sp. were the most abundant trapped species. Other trapped taxa included L. micropus, Microcavia australis I. Geoffroy et d’Orbigny, 1833, Mus musculus Linnaeus, 1758, P. xanthopygus, and Oligoryzomys magellanicus (Bennett, 1835). Two species of the genus Eligmodontia are present in Patagonia (Sikes et al., 1997): E. typus Cuvier, 1837 and E. morgani J.
Acknowledgements
Silvana Peiretti and Karina Hodara greatly improved the writing of this paper. We would like to thank the editor and two anonymous reviewers for providing useful comments on a first version of the manuscript. Special thanks are extended to our field colleagues, Carlos Albrieu and Julio Monguillot. Financial support was provided by Unidad Académica Río Gallegos, Universidad de la Patagonia Austral (UNPA, Santa Cruz, Argentina).
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