Table 3 Annual occupancy of marine biogeographical ecoregions by migrating black-legged kittiwakes (Rissa tridactyla) from the Pribilof Islands (October thru February)
From: Wintering North Pacific black-legged kittiwakes balance spatial flexibility and consistency
| Â | Average bird occupancy (# birds / 45km2) | % Ecoregion occupied | % bird distribution | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Â | 2008/09 | 2009/10 | 2010/11 | 2008/09 | 2009/10 | 2010/11 | 2008/09 | 2009/10 | 2010/11 |
Epicontinental Seas: | 3.9 ± 3.0 | 6.6 ± 5.3 | 4.9 ± 3.0 | 38.8 | 56.2 | 62.9 | 16.1 | 24.4 | 25.6 |
 Bering Sea | 4.3 ± 3.2 | 7.4 ± 5.5 | 5.6 ± 3.0 | 55.1 | 77.2 | 81.7 | 13.2 | 19.4 | 19.3 |
 Sea of Okhotsk | 1.9 ± 1.0 | 3.4 ± 2.2 | 2.6 ± 1.3 | 14.9 | 29.0 | 35.5 | 2.8 | 5.7 | 6.6 |
Subarctic Gyre (West) | 8.5 ± 4.3 | 9.2 ± 5.2 | 7.6 ± 4.0 | 99.7 | 98.5 | 99.7 | 22.0 | 22.7 | 21.5 |
Subarctic Gyre (East) | 6.6 ± 5.0 | 5.3 ± 5.6 | 5.4 ± 4.4 | 58.0 | 39.2 | 79.9 | 16.5 | 11.6 | 22.2 |
Alaska Coastal Downwelling | 4.1 ± 2.4 | 1.4 ± 1.0 | 2.2 ± 1.4 | 20.5 | 12.1 | 34.5 | 1.4 | 0.8 | 2.2 |
Polar Front | 4.5 ± 4.0 | 4.9 ± 4.2 | 2.3 ± 1.8 | 53.4 | 53.2 | 25.6 | 34.0 | 35.3 | 15.9 |
California Current | 1.1 ± 0.3 | 0 | 1.5 ± 0.7 | 16.8 | 0 | 22.9 | 3.7 | 0 | 4.9 |
Kuroshio Current | 3.3 ± 2.4 | 1.9 ± 1.1 | 1.1 ± 0.3 | 21.1 | 12.4 | 22.6 | 5.5 | 3.4 | 5.8 |