Species · BCR 2 · BBS 2025 Release · 1966–2024
American Tree Sparrow In BCR 2
American Tree Sparrow in BCR 2 has increased: up 49% on the route-weighted index since 1987.
+49%Since 1987
19Routes In Region
34Years
Notable Signals
No notable trend signals for American Tree Sparrow in BCR 2. See the full index history below.
Forecast
If the recent trend holds, American Tree Sparrow in BCR 2 is projected to rise about 471% by 2029 — from 1.3 in 2024 to a central estimate of 7.6 (95% range 0.00–21). A 5-year backtest shows a typical error of ±177.8%, with 100% of held-out values landing inside the 95% band.
+471%Change by 2029
7.6Projected 2029 index
0.00–2195% range
±177.8%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 8.5 | 0.00 | 22 |
| 2026 | 8.3 | 0.00 | 22 |
| 2027 | 8.1 | 0.00 | 21 |
| 2028 | 7.8 | 0.00 | 21 |
| 2029 | 7.6 | 0.00 | 21 |
Routes In BCR 2
| Gweek River | ALASKA | 37 | 2002 |
| Nome | ALASKA | 36 | 2023 |
| Togiak River | ALASKA | 29 | 2005 |
| Kanektok Riv | ALASKA | 24 | 2005 |
| St. Mary'S | ALASKA | 15 | 2014 |
| Goodnews Bay | ALASKA | 13 | 2005 |
| Dillingham | ALASKA | 11 | 2012 |
| Salmon Lake | ALASKA | 10 | 2019 |
| Kugarak (Short) | ALASKA | 9 | 1987 |
| Tupuknuk | ALASKA | 8 | 1995 |
| King Salmon | ALASKA | 6 | 2024 |
| Selawik (Short) | ALASKA | 5 | 1987 |
| Katmai N.P. | ALASKA | 4 | 2022 |
| Kotzebue | ALASKA | 3 | 2024 |
| Teller | ALASKA | 2 | 2024 |
| Dillingham (Short) | ALASKA | 2 | 1984 |
| Cape Nome | ALASKA | 1 | 2023 |
| Council | ALASKA | 1 | 2024 |
| Kotzebue (Short) | ALASKA | 1 | 1994 |
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.