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

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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.

	River
	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.