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

Ring-billed Gull Population Trend in Alabama

All statesWetland birds

Ring-billed Gull in Alabama has declined: down 40% on the route-weighted index since 1974.

-40%Since 1974TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
8Routes In StateSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
24YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Ring-billed Gull Trends in AlabamaNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →

No notable trend signals for Ring-billed Gull in Alabama. See the full index history below.

Ring-billed Gull Population Forecast in Alabama

If the recent trend holds, Ring-billed Gull in Alabama is projected to stay roughly flat through 2019, near 0.03 (95% range 0.00–0.14). A 5-year backtest shows a typical error of ±266.9%, with 100% of held-out values landing inside the 95% band.

n/aChange by 2019TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
0.03Projected 2019 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–0.1495% range95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
±266.9%Backtest errorBacktest errorTypical error when we hold out the most recent years, forecast them, and compare to what actually happened. Lower means a more trustworthy projection.Full methodology →
If the recent trend holds, Ring-billed Gull in Alabama is projected to stay roughly flat through 2019, near 0.03 (95% range 0.00–0.14). A 5-year backtest shows a typical error of ±266.9%, with 100% of held-out values landing inside the 95% band.19682019
Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.
YearProjected indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →95% low95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →95% high95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
20150.040.000.15
20160.030.000.15
20170.030.000.15
20180.030.000.14
20190.030.000.14

Ring-billed Gull Survey Routes in Alabama

Routes recording Ring-billed Gull in Alabama.
Recent countThe raw number of individuals recorded on this route in its most recent survey year. A single-route tally, not a trend.Full methodology →
Alabama Pt 2320142004
Bon Secour219941993
Pine Grove219971969
St. Elmo220061999
Alabama Pt120031975
Dauphin Is119871968
Dauphin Is 2120131992
Triana120102010

Ring-billed Gull Population Trend in Other States

arizonacaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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