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Factors determining the distribution of coexisting dormouse species (Gliridae, Rodentia)

Bakó Botond, Hecker Kristóf

Polish Journal of Ecology

2006

Vol. 54, nr 3

379-386

This study investigated coexistence of three dormouse species living in the same habitat, Naszaly-hill, in the north-eastern part of the Danube-bend (47 degrees 49'N, 19 degrees 08'E). The vegetation of the area is very diverse, comprising a mosaic of orchards with natural forests and forest plantations. Data were collected from 1999 to 2005 with wooden nest boxes and from 2002 to 2005 also plastic nest tubes were used. Study area was approximately 6 ha. All three species (hazel dormouse Muscardinus avellanarius L., forest dormouse Dryomys nitedula Pall, and fat dormouse Glis glis L.) have different ecological requirements. However, they occurred simultaneously in some microhabitats and in some places one species clearly predominated. We also observed how the ongoing succession process in the former orchards affected the distribution of dormice. There were seasonal differences in timing of emergence from hibernation, greatly affecting spatial distribution of the different species. Hazel dormice were first to appear in nest boxes and/or tubes, in March, then forest dormice in April and fat dormice in June. As numbers of fat dormice increased the smaller species withdrew from using the nest boxes. Fat dormice reached peak numbers in summer and they entered hibernation by October.