Species · Indiana · BBS 2025 Release · 1966–2024
Herring Gull Population Trend in Indiana
Herring Gull in Indiana has surged: up 142% on the route-weighted index since 1993.
+142%Since 1993
5Routes In State
19Years
Notable Herring Gull Trends in Indiana
long arc increasecomputed index
Herring Gull has surged in Indiana: up 142% on the route-weighted index since 1993.
Herring Gull Population Forecast in Indiana
If the recent trend holds, Herring Gull in Indiana is projected to fall about 63% by 2027 — from 0.33 in 2022 to a central estimate of 0.12 (95% range 0.00–0.45). A 5-year backtest shows a typical error of ±123.5%, with 100% of held-out values landing inside the 95% band.
-63%Change by 2027
0.12Projected 2027 index
0.00–0.4595% range
±123.5%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2023 | 0.12 | 0.00 | 0.45 |
| 2024 | 0.12 | 0.00 | 0.45 |
| 2025 | 0.12 | 0.00 | 0.45 |
| 2026 | 0.12 | 0.00 | 0.45 |
| 2027 | 0.12 | 0.00 | 0.45 |
Herring Gull Survey Routes in Indiana
| Indiana Dune | 17 | 2022 | 1993 |
| Gary | 2 | 1999 | 1987 |
| Portage | 1 | 2004 | 2004 |
| Kankakee Sands | 1 | 2004 | 2004 |
| Portage 2 | 1 | 2011 | 2011 |
Herring Gull Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.