Species · BCR 4 · BBS 2025 Release · 1966–2024
Glaucous-winged Gull In BCR 4
Glaucous-winged Gull in BCR 4 has collapsed: down 99% on the route-weighted index since 1982.
-99%Since 1982
19Routes In Region
39Years
Notable Signals
long arc declinecomputed index
Glaucous-winged Gull has collapsed in BCR 4: down 99% on the route-weighted index since 1982.
Forecast
If the recent trend holds, Glaucous-winged Gull in BCR 4 is projected to fall about 100% by 2029 — from 0.14 in 2024 to a central estimate of 0.00 (95% range 0.00–24). A 5-year backtest shows a typical error of ±4600.8%, with 100% of held-out values landing inside the 95% band.
-100%Change by 2029
0.00Projected 2029 index
0.00–2495% range
±4600.8%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 0.00 | 0.00 | 24 |
| 2026 | 0.00 | 0.00 | 24 |
| 2027 | 0.00 | 0.00 | 24 |
| 2028 | 0.00 | 0.00 | 24 |
| 2029 | 0.00 | 0.00 | 24 |
Routes In BCR 4
| Homer | ALASKA | 463 | 1982 |
| Kalifonsky | ALASKA | 30 | 2023 |
| Petersville | ALASKA | 6 | 1987 |
| Cohoe | ALASKA | 5 | 2016 |
| Cottonwood | ALASKA | 3 | 1990 |
| Hatcher Pass | ALASKA | 2 | 1999 |
| Burma Road | ALASKA | 2 | 2006 |
| Unalakleet River | ALASKA | 2 | 2024 |
| Kuskulana | ALASKA | 2 | 1990 |
| Willow | ALASKA | 1 | 2021 |
| Swan Lake Rd | ALASKA | 1 | 2012 |
| Anchor River | ALASKA | 1 | 2023 |
| Seven Lakes | ALASKA | 1 | 2018 |
| Kachemak | ALASKA | 1 | 2022 |
| Hather Creek | ALASKA | 1 | 2024 |
| Kanuti Canyn | ALASKA | 1 | 2016 |
| Mcgrath | ALASKA | 1 | 1999 |
| Mud River | ALASKA | 1 | 2024 |
| Anvik River | ALASKA | 1 | 2024 |
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.