Alien Species

The Red-Bellied Beautiful Squirrel (Callosciurus erythraeus) in Argentina

Monday, September 20th, 2004

M. Laura Guichón writes: “In 2003, I began studying the invasion dynamics of an alien mammal in Argentina: the Red-Bellied Beautiful Squirrel (Callosciurus erythraeus). Less than five individuals of this arboreal species, native to South-east Asia, were liberated in the Pampas region, Argentina, in 1973. Initial questionnaire surveys have suggested that its distribution in this […]

A modelling study of the spread of the alien grey squirrel (Sciurus carolinensis) in Italy

Tuesday, August 17th, 2004

Clare Tattoni Red squirrels beware A recently discovered population of the North American grey squirrel (Sciurus carolinensis), introduced to Ticino Park, Lombardy (N Italy), is likely to spread into continuous prealpine broadleaf forests of Lombardy and the south of Switzerland. The replacement of red by grey squirrels that is taking place in Piedmont, northern Italy, […]

Pallas’s squirrel (Callosciurus erythraeus erythrogaster) in France

Monday, September 8th, 2003

by Peter Lurz Callosciurus erythraeus Pallas’s Squirrel was introduced to Cap d’Antibes in the 1970s. The species is thought to occur at higher densities than the native red squirrel and causes damage to trees and crops in the area (Jouanin 1990, 1992). Measurements of specimens are reported as: tail: 163-193 mm, head and body length: […]

Red and grey squirrels in the North-East

Monday, September 1st, 2003

Jason Reynolds I was appointed as Red Squirrel Conservation Officer in August 1999. This is the first time that a full-time officer has worked in the North East. Funding of £125000 for three years has been secured from Northumbrian Water Environmental Trust. English Nature’s Species Recovery Programe is also providing £15000 over three years. The […]

The Asian Chipmunk in De Panne, Belgium

Wednesday, October 17th, 2001

Goedele Verbeyen Investigation of the Asian Chipmunk (Eutamias sibiricus Laxmann 1769) in De Panne (Belgium) The Asian chipmunk is being imported in Belgium as a pet since the beginning of the sixties. Now there are four free-living populations in Belgium, one in the Zoniënwoud (Brussels, estimated at 18.000 individuals in 2000!), one in Westerlo, one […]

Expansion of the grey squirrel in Italy

Monday, January 1st, 2001

Sandro Bertolino The grey squirrel in Italy: species expansion and threats for neighbouring countries Origin and spread of the grey squirrel in Italy The grey squirrel was introduced into Piedmont (north-western Italy) in 1948, when two pairs were released at Stupinigi (province of Turin) (Bertolino et al., 2000). In 1966, 5 animals imported from Norfolk […]