Data Zone
The site was identified as important in 2012 because it was regularly supporting significant populations of the species listed below, meeting ('triggering') IBA criteria.
Populations meeting IBA criteria ('trigger species') at the site:| Species | Red List1 | Season | Year(s) | Size | IBA criteria |
|---|---|---|---|---|---|
| Northern Fulmar Fulmarus glacialis | LC | breeding | 1974-2009 | 227,461 individuals | A4ii |
| Northern Fulmar Fulmarus glacialis | LC | non-breeding | 1974-2009 | 422,046 individuals | A4ii |
| Short-tailed Shearwater Ardenna tenuirostris | LC | breeding | 1974-2009 | 3,344,250 individuals | A4ii |
| Sooty Shearwater Ardenna grisea | NT | breeding | 1974-2009 | 1,135,610 individuals | A4ii |
| Red Phalarope Phalaropus fulicarius | LC | breeding | 1974-2009 | 31,057 individuals | A4i |
| Black-legged Kittiwake Rissa tridactyla | VU | non-breeding | 1974-2009 | 30,342 individuals | A4i |
| Black-legged Kittiwake Rissa tridactyla | VU | breeding | 1974-2009 | 106,237 individuals | A4i |
| Glaucous-winged Gull Larus glaucescens | LC | breeding | 1974-2009 | 25,474 individuals | A4i |
| Glaucous-winged Gull Larus glaucescens | LC | non-breeding | 1974-2009 | 46,240 individuals | A4i |
| Tufted Puffin Fratercula cirrhata | LC | breeding | 1974-2009 | 295,697 individuals | A4ii |
| Whiskered Auklet Aethia pygmaea | LC | non-breeding | 1974-2009 | 12,079 individuals | A4ii |
| Whiskered Auklet Aethia pygmaea | LC | breeding | 1974-2009 | 127,285 individuals | A4ii |
| Crested Auklet Aethia cristatella | LC | non-breeding | 1974-2009 | 406,391 individuals | A4ii |
| Kittlitz's Murrelet Brachyramphus brevirostris | NT | breeding | 1974-2009 | 309 individuals | A4ii |
| Ancient Murrelet Synthliboramphus antiquus | LC | breeding | 1974-2009 | 29,504 individuals | A4ii |
1. The current IUCN Red List category. The category at the time of the IBA criteria assessment (2012) may differ.
Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Unimak & Akutan Passes (USA). Downloaded from
https://datazone.birdlife.org/site/factsheet/unimak-&-akutan-passes-iba-usa on 22/11/2024.