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Diversity of Small Mammals in Winter Season in North East Lithuania

The trapping of small mammals was done in two winter seasons (2004/2005 and 2005/2006) in the Zarasai district, north-east Lithuania. Nine small mammal species were registered. For Apodemus uralensis, it was the first finding of the species in north-east Lithuania. C. glareolus (49.4% of all trapped animals) were dominating in both seasons both by numbers and by frequency of occurrence. The shares of M. oeconomus, A. uralensis, A. agrarius and M. musculus were less than 1% each. One to six small mammal species were registered every month. Towards spring numbers of trapped C. glareolus decreased; in March–April dominant became M. arvalis. The dominance of C. glareolus was lessening towards spring, when it was changed by M. arvalis. The diversity of the small mammal community in the winter period was not high (averaged Shannon's H = 1.27). Negative correlation (r = -0.64) was found between the number of trapped animals per session (100 traps) and snow depth. M. arvalis was registered breeding quite early: f...