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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

  Average bird occupancy (# birds / 45km2) % Ecoregion occupied % bird distribution
  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
  1. Marine biogeographical ecoregions are those defined by Longhurst [9]