BirdAnalyst
Species · Alabama · BBS 2025 Release · 1966–2024

Caspian Tern Population Trend in Alabama

All statesWetland birds

Caspian Tern in Alabama has declined: down 30% on the route-weighted index since 1970.

-30%Since 1970
4Routes In State
35Years

Notable Caspian Tern Trends in Alabama

No notable trend signals for Caspian Tern in Alabama. See the full index history below.

Caspian Tern Population Forecast in Alabama

If the recent trend holds, Caspian Tern in Alabama is projected to stay roughly flat through 2024, near 0.04 (95% range 0.00–0.16). A 5-year backtest shows a typical error of ±57.2%, with 100% of held-out values landing inside the 95% band.

n/aChange by 2024
0.04Projected 2024 index
0.00–0.1695% range
±57.2%Backtest error
19662024
Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.
YearProjected index95% low95% high
20200.040.000.17
20210.040.000.17
20220.040.000.17
20230.040.000.16
20240.040.000.16

Caspian Tern Survey Routes in Alabama

Routes recording Caspian Tern in Alabama.
Dauphin Is 2320191991
Alabama Pt220001968
Dauphin Is119901966
St. Elmo120072007

Caspian Tern Population Trend in Other States

alaskacaliforniadelawarefloridaidahoillinoisindianalouisianamarylandmichiganminnesotamontananevadanorth-carolinanorth-dakotaoregonsouth-carolinatexasutahvermontvirginiawashingtonwisconsinwyoming

Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.