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INTRODUCTION A. azarae is a small rodent abundant in the northeast of the Province of Buenos Aires (Argentina). This area belongs to the Pampean Phytogeographic Region, Eastern District. The natural vegetation is a gramineous steppe (Cabrera 1968), these grasses being the characteristic habitats of A. azarae (Barlow 1969). The intense agricultural activity developed in the Pampean Region has extensively modified its physionomy, strongly reducing the areas occupied by natural pastures which were replaced mostly by crops and to a lesser extent by implanted pastures. There still remain, however, relicts of the natural vegetation at roadsides, railroad beds and in areas of scarce agricultural value. At present, A. azarae lives preferably in relicts, implanted pastures and in the scarce natural pastures that still remain (Crespo 1966; Crespo et aL 1970; de Villafane et al. 1973, 1977; Dalby 1975 ; Zuleta et aL 1988). These habitats are less affected by agricultural activity than crop fields which are subject to strong perturbances (plowing, seeding and harvesting works). A. azarae density is very low at cultivated fields (Busch et al. 1984). This was attributed to its preference for habitats with high plant cover and to its low capacity to become adapted to
Mammalia - International Journal of the Systematics, Biology and Ecology of Mammals – de Gruyter
Published: Jan 1, 1992
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