TM 181 Table 5.2

Table 5.2. Number of studies included in this review, by substrate type. (PR = peer-reviewed; NPR = non-peer-reviewed.)

Substrate	1990-2002			Pre-1990			Total
	PR	NPR	Total	PR	NPR	Total
Mud	10	2	12	0	0	0	12
Sand	25	4	29	3	2	5	34
Gravel/Rock	4	0	4	1	0	1	5
Biogenic	3	2	5	1	1	2	7
Mixed Substrate	11	3	14	6	2	8	22

Total	53	11	64	11	7	18	80

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(Modified Jun. 13 2008)