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Research Note
Claire Stevenson
Understanding the role of the landscape matrix in species dispersal is important when targeting conservation and management strategies. This Research Note shows how least-cost modelling was used to assess invasive grey squirrel Sciurus carolinensis dispersal movements within the UK, with a focus on the county of Cumbria. Two major networks were identified separated by the Cumbrian Mountain range. This indicated that there may be multiple colonisation routes into the county. These findings were supported by evidence from DNA sequencing of seven grey squirrel populations. Least-cost model predictions were further validated through data from five global positioning system (GPS) collared grey squirrels. Buffered least-cost path analysis and the development of a least-cost corridor model enabled the most likely grey squirrel dispersal routes to be identified and validated using GPS data. To provide information on movements and land cover use, the individual movements of each squirrel were assessed. A case study was then used to highlight how the validated least-cost model can be applied to areas where red squirrels Sciurus vulgaris are still threatened by the invasive grey squirrel to provide information to target management and conservation actions. The findings should influence management strategies for grey squirrel control and conservation of the native red squirrels.
A4 | 8 pages | colour | online only
Stock code:FCRN014
Practice Note
John Gurnell, Peter Lurz, Robbie McDonald, Harry W Pepper
Practical surveying and monitoring techniques are essential for anyone involved in studying or managing squirrel populations in forests and woodland in Britain. Survey methods can be used to establish the presence of squirrels in a particular area and, if used systematically, can detect significant changes in the distribution or abundance of populations and species over time. Data gathered from surveys can be used to monitor how threatened populations of red squirrels are responding to conservation management or to environmental change, and they can also be used to assess the efficacy of grey squirrel control measures. This Practice Note describes how to plan a survey and gives guidance on which method(s) to use. Five indirect survey techniques are described, which are based on either sightings or signs of squirrels, and advice is given on their suitability for different types of habitat at different times of the year.
A4 leaflet | full colour | 12 pages
Stock code:FCPN011
Practice Note
Brenda A Mayle
This edition replaces the previous versions published in 2003 and 2004. It contains updates regarding legislation on the use of warfarin.
A4 leaflet | 16 pages | 4 colour | online only
Stock code:FCPN004
Information Note
Jenny Bryce
A4 leaflet | full colour
Stock code:FCIN076
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