Species · Vermont · BBS 2025 Release · 1966–2024
American Black Duck Population Trend in Vermont
American Black Duck in Vermont has collapsed: down 87% on the route-weighted index since 1968.
-87%Since 1968
20Routes In State
39Years
Notable American Black Duck Trends in Vermont
long arc declinecomputed index
American Black Duck has collapsed in Vermont: down 86% on the route-weighted index since 1968.
American Black Duck Population Forecast in Vermont
If the recent trend holds, American Black Duck in Vermont is projected to stay roughly flat through 2023, near 0.00 (95% range 0.00–0.33). A 5-year backtest shows a typical error of ±181%, with 100% of held-out values landing inside the 95% band.
n/aChange by 2023
0.00Projected 2023 index
0.00–0.3395% range
±181%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2019 | 0.00 | 0.00 | 0.33 |
| 2020 | 0.00 | 0.00 | 0.33 |
| 2021 | 0.00 | 0.00 | 0.33 |
| 2022 | 0.00 | 0.00 | 0.33 |
| 2023 | 0.00 | 0.00 | 0.33 |
American Black Duck Survey Routes in Vermont
| Landgrove | 4 | 1999 | 1967 |
| Post Mills | 4 | 1999 | 1966 |
| Greensboro | 4 | 1988 | 1968 |
| Marlboro | 3 | 1973 | 1967 |
| East Haven | 3 | 1971 | 1969 |
| North Pownal | 2 | 1975 | 1971 |
| Gaysville | 2 | 2004 | 2004 |
| Middlesex | 2 | 2012 | 1997 |
| Hardwick | 2 | 1994 | 1967 |
| Waterville | 2 | 1973 | 1973 |
| Stratton | 1 | 2018 | 1976 |
| S Reading | 1 | 1992 | 1990 |
| Shaftsbury | 1 | 1966 | 1966 |
| S Wallingfrd | 1 | 2003 | 1966 |
| W Rutland | 1 | 2002 | 1968 |
| East Calais | 1 | 2014 | 1974 |
| Fletcher | 1 | 2008 | 1971 |
| Hinesburg | 1 | 1988 | 1966 |
| Grand Isle | 1 | 1999 | 1967 |
| Bristol | 1 | 2009 | 2008 |
American Black Duck Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.