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Species · Alabama · BBS 2025 Release · 1966–2024

Clapper Rail Population Trend in Alabama

All statesWetland birds

Clapper Rail in Alabama has fallen sharply: down 69% on the route-weighted index since 1968.

-69%Since 1968TrendPercent 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 →
5Routes 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 →
50YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Clapper Rail 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 →

long arc declinecomputed indexTrend sourceWhether the figure is our own computed route-weighted index or an official USGS modeled estimate. The current build labels every trend as computed.Full methodology →

Clapper Rail has fallen sharply in Alabama: down 69% on the route-weighted index since 1968.

Clapper Rail Population Forecast in Alabama

If the recent trend holds, Clapper Rail in Alabama is projected to fall about 89% by 2024 — from 0.05 in 2019 to a central estimate of 0.01 (95% range 0.00–0.15). A 5-year backtest shows a typical error of ±47.3%, with 100% of held-out values landing inside the 95% band.

-89%Change by 2024TrendPercent 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 →
0.01Projected 2024 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–0.1595% 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 →
±47.3%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, Clapper Rail in Alabama is projected to fall about 89% by 2024 — from 0.05 in 2019 to a central estimate of 0.01 (95% range 0.00–0.15). A 5-year backtest shows a typical error of ±47.3%, with 100% of held-out values landing inside the 95% band.19662024
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 →
20200.020.000.16
20210.010.000.16
20220.010.000.15
20230.010.000.15
20240.010.000.15

Clapper Rail Survey Routes in Alabama

Routes recording Clapper Rail 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 →
Dauphin Is 2420191991
Dauphin Is319901966
Alabama Pt119921973
Alabama Pt 2120112008
Chacaloochee Bay120162014

Clapper Rail Population Trend in Other States

connecticutdelawarefloridageorgialouisianamarylandnew-jerseynew-yorknorth-carolinasouth-carolinatexasvirginia

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