Species · New Hampshire · BBS 2025 Release · 1966–2024
American Black Duck Population Trend in New Hampshire
American Black Duck in New Hampshire has collapsed: down 89% on the route-weighted index since 1968.
-89%Since 1968
23Routes In State
47Years
Notable American Black Duck Trends in New Hampshire
long arc declinecomputed index
American Black Duck has collapsed in New Hampshire: down 89% on the route-weighted index since 1968.
American Black Duck Population Forecast in New Hampshire
If the recent trend holds, American Black Duck in New Hampshire is projected to fall about 100% by 2027 — from 0.09 in 2022 to a central estimate of 0.00 (95% range 0.00–0.52). A 5-year backtest shows a typical error of ±127.3%, with 100% of held-out values landing inside the 95% band.
-100%Change by 2027
0.00Projected 2027 index
0.00–0.5295% range
±127.3%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2023 | 0.00 | 0.00 | 0.52 |
| 2024 | 0.00 | 0.00 | 0.52 |
| 2025 | 0.00 | 0.00 | 0.52 |
| 2026 | 0.00 | 0.00 | 0.52 |
| 2027 | 0.00 | 0.00 | 0.52 |
American Black Duck Survey Routes in New Hampshire
| Fitzwilliam | 3 | 1995 | 1966 |
| Concord | 3 | 1990 | 1966 |
| Hopkinton | 2 | 1990 | 1969 |
| Lempster | 2 | 2022 | 1967 |
| Milan | 2 | 2016 | 1967 |
| Stratford | 2 | 2014 | 1969 |
| Clarksville | 2 | 2004 | 1969 |
| Glen | 2 | 2000 | 1976 |
| Peterborough | 1 | 1987 | 1969 |
| Brentwood | 1 | 1975 | 1969 |
| Dover | 1 | 1992 | 1968 |
| Epsom | 1 | 1995 | 1969 |
| Strafford | 1 | 2019 | 1967 |
| Canterbury | 1 | 1975 | 1966 |
| Gilmantn I W | 1 | 2017 | 2017 |
| Wilmot | 1 | 1996 | 1982 |
| Mt Chocorua | 1 | 1977 | 1972 |
| Walpole | 1 | 2006 | 1971 |
| Marlow | 1 | 1998 | 1967 |
| Jefferson Hl | 1 | 2000 | 1976 |
| Franconia | 1 | 2008 | 1967 |
| Dixvil Notch | 1 | 1995 | 1966 |
| Jeffers Ntch | 1 | 2010 | 2010 |
American Black Duck Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.