TABLE 1. Sources of data.

	Environment	Location	Samples	Source reference	Other related references; environmental information
	Marsh	S Norway	10	Murray and Alve, 1999b	Alve and Murray, 1999; Murray and Alve, 1999a
		S Sweden	1	Murray and Alve, 1999b	Alve and Murray, 1999; Murray and Alve, 1999a
		Denmark	3	Murray and Alve, 1999b	Alve and Murray, 1999; Murray and Alve, 1999a
		Exe estuary, UK	3	new	Murray, 1980
		Christchurch, UK	1	new
		Hamble, Beaulieu, UK	11	new	Horne et al., 2004
	Marginal marine	S Norway	59	Murray and Alve, 1999b	Alve and Nagy, 1986; Alve and Murray, 1999; Murray and Alve, 1999a
	(excluding marshes)	S Sweden	36	Murray and Alve, 1999b	Alve and Murray, 1999; Murray and Alve, 1999a
		Denmark	24	Murray and Alve, 1999b	Alve and Murray, 1999; Murray and Alve, 1999a
		Exe estuary, UK	7	new	Murray, 1980, 1983
		Poole, UK	15	new	Humphreys, 2005
		Christchurch, UK	18	new	Murray, 1968
		Hamble estuary, UK	8	Alve and Murray, 1994	Murray and Alve, 2000b; Alve and Murray, 2001
	Fjord	S Norway	4	Alve and Murray, 1995a
		S Norway	8	new
		W Norway	17	new	Alve et al., 2011
		Scotland, Loch Etive	6	Murray, et al., 2003
	Shelf seas	North Sea	21	Alve and Murray, 1995a	Murray, 1985, 1992
		Southern UK	54	Murray and Alve, 2000a	Murray, 1970, 1979, 1986
	Shelf deeps	Skagerrak	18	Alve and Murray, 1995a	Alve and Murray, 1995b, 1997
		Skagerrak	4	new
		W Scotland	3	new	Murray, 2003a, 2003b
	Slope	NE Atlantic	17	Alve and Murray, 1994
		Total	348