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

Ring-billed Gull Population Trend in Florida

All statesWetland birds

Ring-billed Gull in Florida has held roughly steady: down 9% on the route-weighted index since 1971.

-9%Since 1971TrendPercent 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 →
20Routes 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 →
31YearsYears 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 FloridaNotable 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 Florida. See the full index history below.

Ring-billed Gull Population Forecast in Florida

If the recent trend holds, Ring-billed Gull in Florida is projected to fall about 14% by 2020 — from 0.07 in 2015 to a central estimate of 0.06 (95% range 0.00–0.17). A 5-year backtest shows a typical error of ±382.6%, with 100% of held-out values landing inside the 95% band.

-14%Change by 2020TrendPercent 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 →
0.06Projected 2020 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–0.1795% 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 →
±382.6%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 Florida is projected to fall about 14% by 2020 — from 0.07 in 2015 to a central estimate of 0.06 (95% range 0.00–0.17). A 5-year backtest shows a typical error of ±382.6%, with 100% of held-out values landing inside the 95% band.19682020
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 →
20160.060.000.17
20170.060.000.17
20180.060.000.17
20190.060.000.17
20200.060.000.17

Ring-billed Gull Survey Routes in Florida

Routes recording Ring-billed Gull in Florida.
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 →
Merritt Isl419991993
Indiantown420151979
Port St Joe319911980
Plantation K320022002
Ft Gadsden219901990
Scottsmoor220111968
Alligator Pt219991990
Ft Waltn Bch120071971
Broad Branch119781978
Covington119911991
Mabel120032003
Shawano 2120102010
Santa Rosa120031989
Winter Gardn119961996
Pleasant Gr120092009
Homestead120142014
Cross City120152015
Aripeka120102007
Weaver Stn120012001
Citrus Park120071993

Ring-billed Gull Population Trend in Other States

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

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