Species · Delaware · BBS 2025 Release · 1966–2024
Acadian Flycatcher Population Trend in Delaware
Acadian Flycatcher in Delaware has surged: up 208% on the route-weighted index since 1968.
+208%Since 1968
16Routes In State
58Years
Notable Acadian Flycatcher Trends in Delaware
long arc increasecomputed index
Acadian Flycatcher has surged in Delaware: up 208% on the route-weighted index since 1968.
Acadian Flycatcher Population Forecast in Delaware
If the recent trend holds, Acadian Flycatcher in Delaware is projected to stay roughly flat through 2029, near 3.8 (95% range 1.7–5.9). A 5-year backtest shows a typical error of ±33.5%, with 60% of held-out values landing inside the 95% band.
+0%Change by 2029
3.8Projected 2029 index
1.7–5.995% range
±33.5%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 3.6 | 1.5 | 5.8 |
| 2026 | 3.7 | 1.6 | 5.8 |
| 2027 | 3.7 | 1.6 | 5.8 |
| 2028 | 3.8 | 1.6 | 5.9 |
| 2029 | 3.8 | 1.7 | 5.9 |
Acadian Flycatcher Survey Routes in Delaware
| Milton 2 | 11 | 2017 | 2017 |
| Millsboro | 7 | 2024 | 2017 |
| Pepperbox | 7 | 2016 | 1998 |
| Harrington | 5 | 2024 | 1966 |
| Holleyville | 3 | 2004 | 1966 |
| Pepperbox 2 | 3 | 2024 | 2017 |
| Blackbird | 2 | 2024 | 1995 |
| Holleyville 2 | 2 | 2024 | 2006 |
| Georgetown | 2 | 2022 | 1992 |
| Mt Pleasant | 1 | 2019 | 1966 |
| Wilmington | 1 | 1990 | 1967 |
| Frederica | 1 | 2013 | 1966 |
| Dover | 1 | 1975 | 1972 |
| Frankford | 1 | 2012 | 1966 |
| Lowes Xrds | 1 | 1991 | 1966 |
| Milton | 1 | 2016 | 1966 |
Acadian Flycatcher Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.