Species · Alabama · BBS 2025 Release · 1966–2024
Tricolored Heron Population Trend in Alabama
Tricolored Heron in Alabama has collapsed: down 78% on the route-weighted index since 1968.
-78%Since 1968
8Routes In State
51Years
Notable Tricolored Heron Trends in Alabama
long arc declinecomputed index
Tricolored Heron has collapsed in Alabama: down 78% on the route-weighted index since 1968.
Tricolored Heron Population Forecast in Alabama
If the recent trend holds, Tricolored Heron in Alabama is projected to stay roughly flat through 2023, near 0.00 (95% range 0.00–0.14). A 5-year backtest shows a typical error of ±177.3%, with 100% of held-out values landing inside the 95% band.
n/aChange by 2023
0.00Projected 2023 index
0.00–0.1495% range
±177.3%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2019 | 0.00 | 0.00 | 0.14 |
| 2020 | 0.00 | 0.00 | 0.14 |
| 2021 | 0.00 | 0.00 | 0.14 |
| 2022 | 0.00 | 0.00 | 0.14 |
| 2023 | 0.00 | 0.00 | 0.14 |
Tricolored Heron Survey Routes in Alabama
| Dauphin Is | 1 | 1990 | 1966 |
| Alabama Pt | 1 | 1995 | 1980 |
| Dauphin Is 2 | 1 | 2015 | 1991 |
| Alabama Pt 2 | 1 | 2009 | 2009 |
| Epes | 1 | 2016 | 2016 |
| Gainestown Ferry | 1 | 2006 | 2001 |
| Chacaloochee Bay | 1 | 2017 | 2009 |
| Grangeburg | 1 | 2018 | 2018 |
Tricolored Heron Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.