Species · Maine · BBS 2025 Release · 1966–2024
Alder Flycatcher Population Trend in Maine
Alder Flycatcher in Maine has declined: down 45% on the route-weighted index since 1968.
-45%Since 1968
77Routes In State
58Years
Notable Alder Flycatcher Trends in Maine
No notable trend signals for Alder Flycatcher in Maine. See the full index history below.
Alder Flycatcher Population Forecast in Maine
If the recent trend holds, Alder Flycatcher in Maine is projected to rise about 54% by 2029 — from 2.4 in 2024 to a central estimate of 3.7 (95% range 1.0–6.3). A 5-year backtest shows a typical error of ±79.4%, with 100% of held-out values landing inside the 95% band.
+54%Change by 2029
3.7Projected 2029 index
1.0–6.395% range
±79.4%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 3.7 | 1.1 | 6.3 |
| 2026 | 3.7 | 1.0 | 6.3 |
| 2027 | 3.7 | 1.0 | 6.3 |
| 2028 | 3.7 | 1.0 | 6.3 |
| 2029 | 3.7 | 1.0 | 6.3 |
Alder Flycatcher Survey Routes in Maine
| St David | 21 | 2005 | 1982 |
| Harmony | 17 | 2024 | 1974 |
| Benton | 15 | 1980 | 1971 |
| Ludlow | 15 | 1998 | 1968 |
| Ft Fairfield | 15 | 2005 | 1993 |
| Baker Lake | 13 | 2009 | 1995 |
| Deblois | 12 | 2007 | 1966 |
| Cooper | 10 | 2021 | 1975 |
| Northfield | 10 | 1981 | 1976 |
| Washburn | 10 | 2005 | 1979 |
| Warren | 9 | 1990 | 1975 |
| Forest Sta | 9 | 2000 | 1972 |
| Hancock | 8 | 2024 | 1969 |
| Boundary | 8 | 2016 | 1993 |
| Clayton Lake 2 | 8 | 2013 | 2010 |
| Castine | 7 | 2006 | 1976 |
| Clayton Lake | 7 | 2008 | 1982 |
| Big Twenty | 7 | 2008 | 1993 |
| Weeks Brook | 7 | 2016 | 1995 |
| East Troy | 6 | 2019 | 1972 |
| Hermon | 5 | 2019 | 1966 |
| Hudson | 5 | 2016 | 1973 |
| Ashland | 5 | 2008 | 1980 |
| Heron Lake | 5 | 2003 | 1983 |
| Greenwood | 4 | 2021 | 2005 |
Alder Flycatcher Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.