Spread and attempted eradication of the grey squirrel ( Sciurus carolinensis ) in Italy, and consequences for the red squirrel ( Sciurus vulgaris ) in Eurasia

2003 ◽  
Vol 109 (3) ◽  
pp. 351-358 ◽  
Author(s):  
Sandro Bertolino ◽  
Piero Genovesi
Keyword(s):  
Sciurus Carolinensis ◽  
Red Squirrel ◽  
Sciurus Vulgaris ◽  
Grey Squirrel

Distribution and status of the Red Squirrel (Sciurus vulgaris) and Grey Squirrel (Sciurus carolinensis) in Ireland

Mammal Review ◽  
2000 ◽  
Vol 30 (1) ◽  
pp. 45-56 ◽  
Author(s):  
D. O. Teangana ◽  
S. Reilly ◽  
W. I. Montgomery ◽  
J. Rochford
Keyword(s):  
Sciurus Carolinensis ◽  
Red Squirrel ◽  
Sciurus Vulgaris ◽  
Grey Squirrel

Biodiversity threats from outside to inside: effects of alien grey squirrel (Sciurus carolinensis) on helminth community of native red squirrel (Sciurus vulgaris)

2015 ◽  
Vol 114 (7) ◽  
pp. 2621-2628 ◽  
Author(s):  
Claudia Romeo ◽  
Nicola Ferrari ◽  
Paolo Lanfranchi ◽  
Nicola Saino ◽  
Francesca Santicchia ◽  
...  
Keyword(s):  
Sciurus Carolinensis ◽  
Red Squirrel ◽  
Helminth Community ◽  
Sciurus Vulgaris ◽  
Grey Squirrel

scholarly journals Natural strongholds for red squirrel conservation in Scotland

2021 ◽  
Vol 43 ◽  
pp. 93-108
Author(s):  
Andrew Slade ◽  
Andy White ◽  
Kenny Kortland ◽  
Peter W. W. Lurz
Keyword(s):  
Management Practice ◽  
Management Policy ◽  
Sciurus Carolinensis ◽  
Red Squirrel ◽  
Grey Squirrel ◽  
Case Scenario ◽  
Red Squirrels ◽  
Worst Case ◽  
Standard Management ◽  
Grey Squirrels

The Eurasian Red Squirrel (Sciurus vulgaris) is under threat from the invasive North American eastern Grey Squirrel (Sciurus carolinensis) with 80% of the remaining red squirrel populations in the British Isles found in Scotland. In this study we develop a spatially explicit mathematical model of the red and grey squirrel system and use it to assess the population viability of red squirrels across Scotland. In particular, we aim to identify existing forests – natural strongholds for red squirrels – that can successfully support red squirrels under UK Forestry Standard management and protect them from potential disease-mediated competition from grey squirrels. Our model results indicate that if current levels of grey squirrel control, which restrict or reduce the distribution of grey squirrels, are continued then there will be large expanses of forests in northern Scotland that support viable red squirrel populations. Model results that represent (hypothetical) scenarios where grey squirrel control no longer occurred indicated that grey squirrel range expansion and the process of red squirrel replacement would be slow. Model results for an assumed worst-case scenario where grey squirrels have expanded to all regions in Scotland identified forest regions – denoted natural strongholds – that could currently support red squirrels under UK Forestry Standard management practice. The results will be used to inform forest management policy and support a strategic review of red squirrel management by land management agencies and other stakeholders.

Spacing behaviour, kinship, and population dynamics of grey squirrels in a newly colonized broadleaf woodland in Italy

2001 ◽  
Vol 79 (9) ◽  
pp. 1533-1543 ◽  
Author(s):  
John Gurnell ◽  
Luc A Wauters ◽  
Damiano Preatoni ◽  
Guido Tosi
Keyword(s):  
Home Range ◽  
Home Range Size ◽  
Core Area ◽  
Adult Survival ◽  
Sciurus Carolinensis ◽  
Red Squirrel ◽  
Grey Squirrel ◽  
Colonization Process ◽  
Juvenile Males ◽  
Grey Squirrels

Eastern grey squirrels, Sciurus carolinensis, introduced to Britain and northern Italy are replacing the native Eurasian red squirrel, Sciurus vulgaris. We studied the pattern of colonization of a high-quality broadleaf woodland by grey squirrels by means of livetrapping and radio-tracking. The studies started in July 1996, when six grey squirrels (four males, two females) first colonized the woodland, and lasted until November 1998, when densities exceeded those of the local red squirrel population. Grey squirrel colonization was rapid, with a high proportion of adult and yearling females breeding. Juvenile recruitment was also higher than in stable populations in Britain. Adult survival was better in 1997 (83%) than in 1998 (47%), with predation accounting for 67% of losses in 1998. This indicates the effects of local predator communities on the colonization process. Densities of grey squirrels were moderate in 1998, with a maximum of 1.9 squirrels/ha and we expect density to increase further. Adult home range sizes were three to four times larger than those of subadults, and male ranges were larger than those of females. Body mass was positively correlated with both total home range size and core-area size. Core-area size for adults was inversely correlated with food availability. Juvenile female grey squirrels were philopatric, forming female kin groups, while most juvenile males settled outside the mother's home range.

scholarly journals An Opportunistic Assessment of the Impact of Squirrelpox Disease Outbreaks upon a Red Squirrel Population Sympatric with Grey Squirrels in Wales

Animals ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 99
Author(s):  
Craig M. Shuttleworth ◽  
David Everest ◽  
Paul Holmes ◽  
Suzi Bell ◽  
Rachel Cripps
Keyword(s):  
Survival Rates ◽  
Disease Outbreaks ◽  
Sciurus Carolinensis ◽  
Red Squirrel ◽  
Grey Squirrel ◽  
Red Squirrels ◽  
Local Survival ◽  
Temporal And Spatial ◽  
The Impact ◽  
Grey Squirrels

Native red squirrels (Sciurus vulgaris) persisted in the coastal mainland woodlands of northern Gwynedd whilst sympatric with an invasive grey squirrel (Sciurus carolinensis) population suppressed by culling. Squirrelpox disease in the red squirrel population was recorded in 2017 and 2020/21. An autumn 2020 outbreak was associated with only 17.4% of animals caught and marked in the preceding June known to be present in March 2021. Despite an opportunistic data collection lacking the rigour of empirical experimental design, we observed low local survival rates similar to previously published accounts reported during major squirrelpox outbreaks. The use of a conservation dog to detect red squirrel carcasses resulted in positive detection and confirmation of a temporal and spatial expansion of one disease outbreak. The study is the first in Wales to use conservation dogs and the findings reinforce the vital strategic importance of geographical isolation reducing sympatry of red with grey squirrels in European regions where the introduced congener is a source of the squirrelpox infection.

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