Changes in Abiotic Drivers of Green Sea Urchin Demographics following the Loss of a Keystone Predator

Table 2

Number of sites sampled by island and year.

Island group	Island	Time period of sea otter status
		Predecline				End of decline			Postdecline 1			Postdecline 2
		1987	1990	1993	1994	1997	1999	2000	2008	2010	2014	2015	2016	2017
Near Islands	Attu	10	14	18	2	-	-	21	22	-	6	4	-	6
	Agattu	-	-	6	-	-	-	-	6	-	-	4	-	-
	Semichi	33	-	1	29	30	-	-	33	-	6	6	-	5
Rat Islands	Kiska	-	-	20	-	-	-	20	20	-	6	6	-	5
	Hawadax	-	-	-	13	-	-	-	15	1	-	6	-	-
	Amchitka	29	-	-	-	-	31	11	31	-	6	5	-	6
Andreanof and Delarof Islands	Ogliuga	-	-	-	4	-	-		10	-	6	6	-	6
	Tanaga	-	-	-	13	-	-	-	4	-	6	-	5	-
	Adak	28	-	-	-	27	30	29	30	-	6	4	6	6
	Atka	-	-	-	-	-	-	-	10	-	-	-	3	6
Islands of Four Mountains	Seguam	-	-	-	10	-	-	-	-	7	-	-	-	-
	Yunaska	-	-	-	12	-	-	-	-	-	-	-	-	6
	Chuginadak	-	-	-	12	-	-	-	12	-	-	-	6	-
Fox Islands	Umnak	-	-	-	8	-	-	-	-	-	-	-	6	-
	Unalaska	-	-	-	12	-	-	-	-	2	-	-	6	-

Italicized numbers (<4) denote samples excluded from analysis for inadequate sample size. Dashes correspond to no available data.