Factors affecting the distribution of<Emphasis Type="Italic">Sorex samniticus</Emphasis>, an endemic Italian shrew,in an heterogeneous landscape |
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Authors: | Alessio Mortelliti Giovanni Amori Giampiero Sammuri Luigi Boitani |
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Institution: | 1.Department of Animal and Human Biology,University ?La Sapienza?,Rome,Italy;2.CNR- Institute of Ecosystem Studies,Rome,Italy;3.Province of Siena,Environmental Policies Office,Siena,Italy |
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Abstract: | We studied the factors affecting the distribution of an endemic shrewSorex samniticus Altobello, 1926 in the Province of Siena, central Italy. Distribution data were obtained by examining pellets from 31 barn
owlTyto alba sites (roosts) over a period spanning from 1974 to 2005. We constructed a model using logistic regression analysis on presence/absence
data. Results show that an increase in forest dominated byQuercus cerris andCastanea sativa led to the local extinction of this species. Results were confirmed through the examination of one box, with 3044 prey items
deposited in layers, that documents the expansion of the species in that area following increased logging ofQuercus cerris andCastanea sativa forests. Cessation of logging has again led to the absence of the species from the area. We discuss these results from the
perspective of ecological network planning, showing that utilisation of non-detailed maps, such as Corine Land Cover, that
do not distinguish between the various kind of broadleaved forests is inadequate to describe the finer grade of habitat selection
of this small mammal. |
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