Species · Connecticut · BBS 2025 Release · 1966–2024
American Black Duck Population Trend in Connecticut
American Black Duck in Connecticut has collapsed: down 88% on the route-weighted index since 1969.
-88%Since 1969
11Routes In State
23Years
Notable American Black Duck Trends in Connecticut
long arc declinecomputed index
American Black Duck has collapsed in Connecticut: down 88% on the route-weighted index since 1969.
American Black Duck Population Forecast in Connecticut
If the recent trend holds, American Black Duck in Connecticut is projected to fall about 100% by 2022 — from 0.07 in 2017 to a central estimate of 0.00 (95% range 0.00–1.2). A 5-year backtest shows a typical error of ±397.5%, with 100% of held-out values landing inside the 95% band.
-100%Change by 2022
0.00Projected 2022 index
0.00–1.295% range
±397.5%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2018 | 0.00 | 0.00 | 1.2 |
| 2019 | 0.00 | 0.00 | 1.2 |
| 2020 | 0.00 | 0.00 | 1.2 |
| 2021 | 0.00 | 0.00 | 1.2 |
| 2022 | 0.00 | 0.00 | 1.2 |
American Black Duck Survey Routes in Connecticut
| Westbrook | 9 | 1991 | 1981 |
| Willimantic | 5 | 1970 | 1969 |
| E Hartland | 2 | 1969 | 1968 |
| Danbury | 2 | 1971 | 1971 |
| Mystic | 1 | 2017 | 1981 |
| Uncasville | 1 | 1982 | 1982 |
| Woodstock | 1 | 1979 | 1968 |
| No Woodbury | 1 | 1970 | 1969 |
| Sherman | 1 | 1989 | 1972 |
| Greenwich | 1 | 1975 | 1967 |
| Mid Haddam | 1 | 1994 | 1983 |
American Black Duck Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.