Scottish Marine and Freshwater Science Volume 6 Number 4: A Mapping Study of the Overlap of Potential Eurasian Beaver (Castor fiber) Habitat and Atlantic Salmon (Salmo salar) Distribution in Scotland
Report establishing whether there would be substantial overlap of potential beaver habitat and known Atlantic salmon distribution, should beavers be formally reintroduced to Scotland.
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Table 1. Estimates of key parameters from current distributions of salmon and predicted area of suitable woodland for beavers. Potential beaver-salmon overlap is the percentage of salmon distribution within 50m of suitable beaver habitat. Major rivers (predominantly main stems) and minor rivers (mainly tributaries) refer to rivers width deemed to be above and below 10m respectively.
|Awe||Ayr||Conon||North Esk||Tay||Tweed in Scotland|
|Area of beaver woodland in catchment (m²)||18655128||16728110||21516908||23437700||121500771||86154807|
|Area of salmon habitat in catchment (m²)||2328842||2530925||3094610||2572830||17605365||17468072|
|Area of salmon habitat in major rivers (m²)||1531006||2028734||2665312||1793813||14723015||11127785|
|Area of salmon habitat in minor rivers (m²)||797835||502191||429298||779018||2882350||6340287|
|Potential beaver-salmon overlap in catchment (%)||62||71||55||73||72||47|
|Potential beaver-salmon overlap within major rivers (%)||70||80||61||87||75||54|
|Potential beaver-salmon overlap within minor rivers (%)||46||32||15||39||59||36|
Figure 1. General overview of the six study catchments in which distributions of salmon rivers and suitable beaver woodland were compared.
Figure 2. Maps showing salmon rivers within 50m of suitable beaver woodland in six Scottish river catchments. Figure 2(a) River Ayr, Figure 2(b) River Awe, Figure 2(c) River Tweed, Figure 2(d) River Tay, Figure 2(e) River North Esk, Figure 2(f) River Conon.
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