Species · Maine · BBS 2025 Release · 1966–2024
Herring Gull Population Trend in Maine
Herring Gull in Maine has collapsed: down 88% on the route-weighted index since 1968.
-88%Since 1968
41Routes In State
58Years
Notable Herring Gull Trends in Maine
long arc declinecomputed index
Herring Gull has collapsed in Maine: down 88% on the route-weighted index since 1968.
Herring Gull Population Forecast in Maine
If the recent trend holds, Herring Gull in Maine is projected to fall about 100% by 2029 — from 1.8 in 2024 to a central estimate of 0.00 (95% range 0.00–8.0). A 5-year backtest shows a typical error of ±227.1%, with 80% of held-out values landing inside the 95% band.
-100%Change by 2029
0.00Projected 2029 index
0.00–8.095% range
±227.1%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 0.00 | 0.00 | 8.0 |
| 2026 | 0.00 | 0.00 | 8.0 |
| 2027 | 0.00 | 0.00 | 8.0 |
| 2028 | 0.00 | 0.00 | 8.0 |
| 2029 | 0.00 | 0.00 | 8.0 |
Herring Gull Survey Routes in Maine
| Kittery Pt | 31 | 2024 | 1966 |
| Moose River | 28 | 2008 | 1983 |
| Biddeford | 8 | 2006 | 1973 |
| Jefferson | 8 | 2010 | 1992 |
| Deblois | 5 | 2007 | 1966 |
| Greenville | 4 | 1999 | 1977 |
| Seboomook Lk | 3 | 2014 | 1972 |
| Newcastle | 2 | 2024 | 1971 |
| Bethel | 2 | 1989 | 1979 |
| Turner | 2 | 2010 | 1972 |
| Hartford | 2 | 1982 | 1975 |
| Brooks | 2 | 2016 | 1977 |
| Hancock | 2 | 2011 | 1969 |
| Cooper | 2 | 2005 | 1975 |
| Cape Neddick | 1 | 2023 | 1972 |
| Westbrook | 1 | 2010 | 1977 |
| Wilson Mills | 1 | 2024 | 1984 |
| Greenwood | 1 | 1999 | 1974 |
| South Arm | 1 | 1979 | 1979 |
| Otisfield Gr | 1 | 2012 | 1966 |
| Bowdoin Ctr | 1 | 1999 | 1971 |
| Manchester | 1 | 1980 | 1971 |
| East Troy | 1 | 1996 | 1972 |
| Warren | 1 | 1990 | 1973 |
| Freedom | 1 | 1992 | 1978 |
Herring Gull Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.