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Species · Nevada · BBS 2025 Release · 1966–2024

Ring-billed Gull Population Trend in Nevada

All statesWetland birds

Ring-billed Gull in Nevada has edged down: down 25% on the route-weighted index since 1995.

-25%Since 1995TrendPercent 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 →
7Routes 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 →
21YearsYears 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 NevadaNotable 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 Nevada. See the full index history below.

Ring-billed Gull Population Forecast in Nevada

If the recent trend holds, Ring-billed Gull in Nevada is projected to rise about 164% by 2023 — from 0.33 in 2018 to a central estimate of 0.88 (95% range 0.00–5.2). A 5-year backtest shows a typical error of ±445.2%, with 100% of held-out values landing inside the 95% band.

+164%Change by 2023TrendPercent 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 →
0.88Projected 2023 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–5.295% 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 →
±445.2%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 Nevada is projected to rise about 164% by 2023 — from 0.33 in 2018 to a central estimate of 0.88 (95% range 0.00–5.2). A 5-year backtest shows a typical error of ±445.2%, with 100% of held-out values landing inside the 95% band.19722023
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 →
20191.10.005.4
20201.00.005.4
20210.980.005.3
20220.930.005.3
20230.880.005.2

Ring-billed Gull Survey Routes in Nevada

Routes recording Ring-billed Gull in Nevada.
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 →
Gardnerville4020041995
Dobbin Creek2920141972
Majors Place1020121999
Bald Mtn.720181997
Cortez420182018
Fallon220121992
Carson River120022001

Ring-billed Gull Population Trend in Other States

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

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