Headcount 2010: the multiplication of the grey squirrel populations introduced to Italy

摘要: The introduction of non-native animal species is an important cause loss biodiversity, for this reason their population control has received a lot attention in the scientific literature. While number introduced many taxa constantly growing, eradication new populations (“a posteriori” action) and regulation trade live animals plants priori” strategies) proceeding slowly. Tree squirrels as taxon grey ( Sciurus carolinensis ) particular are among most successful invasive alien species. Here we present current situation (October 2010) squirrel Italy. was first reported Piedmont area around Stupinigi forests 1948. Subsequent major introductions were Genova-Nervi (1966) Ticino Valley Regional Park Lombardy (1999). In 2010, there 24 areas with (meta) or nucleus squirrels: 23 these three regions affected by Piedmont, Liguria. known presence strongly increased last years. With exception population, lack detailed knowledge on distribution size where now believed to be present. We underline necessity introduce immediately ban and, preferably, all Sciuridae family, start immediate actions.