Species · Rhode Island · BBS 2025 Release · 1966–2024
American Black Duck Population Trend in Rhode Island
American Black Duck in Rhode Island has risen sharply: up 57% on the route-weighted index since 1970.
+57%Since 1970
3Routes In State
21Years
Notable American Black Duck Trends in Rhode Island
long arc increasecomputed index
American Black Duck has risen sharply in Rhode Island: up 57% on the route-weighted index since 1970.
American Black Duck Population Forecast in Rhode Island
If the recent trend holds, American Black Duck in Rhode Island is projected to stay roughly flat through 2009, near 3.6 (95% range 0.75–6.5). A 5-year backtest shows a typical error of ±58.9%, with 80% of held-out values landing inside the 95% band.
-10%Change by 2009
3.6Projected 2009 index
0.75–6.595% range
±58.9%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2005 | 3.4 | 0.51 | 6.3 |
| 2006 | 3.4 | 0.57 | 6.3 |
| 2007 | 3.5 | 0.63 | 6.4 |
| 2008 | 3.6 | 0.69 | 6.4 |
| 2009 | 3.6 | 0.75 | 6.5 |
American Black Duck Survey Routes in Rhode Island
| Block Island | 4 | 2004 | 1987 |
| Quonset Pt | 3 | 1978 | 1969 |
| Sachuest Pt | 1 | 1988 | 1967 |
American Black Duck Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.