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Species · Nevada · BBS 2025 Release · 1966–2024

California Gull Population Trend in Nevada

All statesWetland birds

California Gull in Nevada has held roughly steady: up 8% on the route-weighted index since 1973.

+8%Since 1973TrendPercent 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 →
12Routes 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 →
43YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable California 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 California Gull in Nevada. See the full index history below.

California Gull Population Forecast in Nevada

If the recent trend holds, California Gull in Nevada is projected to fall about 62% by 2029 — from 5.6 in 2024 to a central estimate of 2.1 (95% range 0.00–23). A 5-year backtest shows a typical error of ±607.9%, with 100% of held-out values landing inside the 95% band.

-62%Change by 2029TrendPercent 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 →
2.1Projected 2029 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–2395% 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 →
±607.9%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, California Gull in Nevada is projected to fall about 62% by 2029 — from 5.6 in 2024 to a central estimate of 2.1 (95% range 0.00–23). A 5-year backtest shows a typical error of ±607.9%, with 100% of held-out values landing inside the 95% band.19692029
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 →
20252.70.0023
20262.60.0023
20272.40.0023
20282.30.0023
20292.10.0023

California Gull Survey Routes in Nevada

Routes recording California 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 →
Ruby Valley 211820242006
Sand Pass6420191996
Fallon3520241992
Carson River2220052002
Hiko1320092009
Gardnerville1020031993
Dobbin Creek520181971
Nixon420181973
Bald Mtn.320242024
Ruby Valley120001997
Sutcliffe119711969
Darroughs Hot Spgs120062006

California Gull Population Trend in Other States

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