Species · Pennsylvania · BBS 2025 Release · 1966–2024
Acadian Flycatcher Population Trend in Pennsylvania
Acadian Flycatcher in Pennsylvania has surged: up 257% on the route-weighted index since 1968.
+257%Since 1968
112Routes In State
58Years
Notable Acadian Flycatcher Trends in Pennsylvania
long arc increasecomputed index
Acadian Flycatcher has surged in Pennsylvania: up 257% on the route-weighted index since 1968.
Acadian Flycatcher Population Forecast in Pennsylvania
If the recent trend holds, Acadian Flycatcher in Pennsylvania is projected to rise about 13% by 2029 — from 2.2 in 2024 to a central estimate of 2.5 (95% range 1.7–3.4). A 5-year backtest shows a typical error of ±14.7%, with 100% of held-out values landing inside the 95% band.
+13%Change by 2029
2.5Projected 2029 index
1.7–3.495% range
±14.7%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 2.4 | 1.6 | 3.3 |
| 2026 | 2.5 | 1.6 | 3.3 |
| 2027 | 2.5 | 1.6 | 3.3 |
| 2028 | 2.5 | 1.7 | 3.3 |
| 2029 | 2.5 | 1.7 | 3.4 |
Acadian Flycatcher Survey Routes in Pennsylvania
| Broad Mtn. | 20 | 2024 | 1993 |
| Laurel Hill | 16 | 2024 | 1978 |
| Tussey Mtn. | 16 | 2024 | 1993 |
| Landisburg | 14 | 2024 | 1978 |
| Stoneybreak | 14 | 2024 | 1992 |
| St College | 9 | 2024 | 1976 |
| N Washington | 8 | 2024 | 1973 |
| Harmonsburg | 7 | 2023 | 1979 |
| Martinsburg | 7 | 2024 | 1988 |
| Warrens Mill | 7 | 2024 | 1972 |
| Mill Run | 7 | 2024 | 1978 |
| Ravensburg | 6 | 1971 | 1971 |
| Shelocta | 6 | 2024 | 1968 |
| Clear Spring | 6 | 2024 | 1966 |
| Beaver | 5 | 2024 | 1981 |
| Sardis | 5 | 1974 | 1970 |
| Peru Mills | 5 | 2024 | 1966 |
| Duvall | 4 | 2021 | 1974 |
| Parkwood | 4 | 2024 | 1983 |
| Kittanning | 4 | 2024 | 1973 |
| Kaylor | 4 | 2024 | 1995 |
| Margaret | 4 | 2024 | 1970 |
| Needmore | 4 | 1991 | 1966 |
| Harrisville | 4 | 2023 | 1997 |
| Rothrock Sf | 4 | 2019 | 1992 |
Acadian Flycatcher Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.