BirdAnalyst
Species · Alabama · BBS 2026 Release · 1966–2025

Common Gallinule Population Trend in Alabama

All statesWetland birds

Common Gallinule in Alabama has surged: up 99% on the route-weighted index since 1977.

+99%Since 1977TrendPercent 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 →
11Routes 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 Common Gallinule 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 Common Gallinule in Alabama. See the full index history below.

Common Gallinule Population Forecast in Alabama

If the recent trend holds, Common Gallinule in Alabama is projected to stay roughly flat through 2028, near 0.07 (95% range 0.00–0.13). A 5-year backtest shows a typical error of ±86%, with 100% of held-out values landing inside the 95% band.

n/aChange by 2028TrendPercent 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 →
0.07Projected 2028 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–0.1395% 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 →
±86%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, Common Gallinule in Alabama is projected to stay roughly flat through 2028, near 0.07 (95% range 0.00–0.13). A 5-year backtest shows a typical error of ±86%, with 100% of held-out values landing inside the 95% band.19662028
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 →
20240.060.000.13
20250.060.000.13
20260.070.000.13
20270.070.000.13
20280.070.000.13

Common Gallinule Survey Routes in Alabama

Routes recording Common Gallinule 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 →
Chacaloochee Bay720192009
Dauphin Is 2219941994
Fairview219921992
Rock Chapel220232023
Madrid119991997
Dauphin Is119851966
Alabama Pt119901973
Brooksville119901990
Smyer Lake120042004
Elberta119951995
Grangeburg120051999

Common Gallinule Population Trend in Other States

arizonaarkansascaliforniaconnecticutdelawarefloridageorgiaillinoisindianakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippinevadanew-jerseynew-yorknorth-carolinaohiopennsylvaniasouth-carolinatennesseetexasutahvermontwisconsin

Source: USGS North American Breeding Bird Survey, retrieved 2026-08-14.