Species · Maine · BBS 2025 Release · 1966–2024
Common Tern Population Trend in Maine
Common Tern in Maine has fallen sharply: down 62% on the route-weighted index since 1968.
-62%Since 1968
6Routes In State
19Years
Notable Common Tern Trends in Maine
long arc declinecomputed index
Common Tern has fallen sharply in Maine: down 62% on the route-weighted index since 1968.
Common Tern Population Forecast in Maine
If the recent trend holds, Common Tern in Maine is projected to stay roughly flat through 2024, near 0.00 (95% range 0.00–0.68). A 5-year backtest shows a typical error of ±750.9%, with 40% of held-out values landing inside the 95% band.
n/aChange by 2024
0.00Projected 2024 index
0.00–0.6895% range
±750.9%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2020 | 0.00 | 0.00 | 0.68 |
| 2021 | 0.00 | 0.00 | 0.68 |
| 2022 | 0.00 | 0.00 | 0.68 |
| 2023 | 0.00 | 0.00 | 0.68 |
| 2024 | 0.00 | 0.00 | 0.68 |
Common Tern Survey Routes in Maine
| St David | 11 | 2005 | 1984 |
| Deblois | 4 | 1966 | 1966 |
| Baker Lake | 3 | 1997 | 1997 |
| Kittery Pt | 1 | 2019 | 1966 |
| Newcastle | 1 | 1973 | 1973 |
| Medway | 1 | 1993 | 1992 |
Common Tern Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.