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