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Species · Alabama · BBS 2025 Release · 1966–2024

Black-and-white Warbler Population Trend in Alabama

All statesForest birds

Black-and-white Warbler in Alabama has edged down: down 16% on the route-weighted index since 1968.

-16%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 →
68Routes 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 →
58YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Black-and-white Warbler 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 Black-and-white Warbler in Alabama. See the full index history below.

Black-and-white Warbler Population Forecast in Alabama

If the recent trend holds, Black-and-white Warbler in Alabama is projected to fall about 14% by 2029 — from 0.58 in 2024 to a central estimate of 0.50 (95% range 0.20–0.79). A 5-year backtest shows a typical error of ±27.2%, with 80% of held-out values landing inside the 95% band.

-14%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 →
0.50Projected 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 →
0.20–0.7995% 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 →
±27.2%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, Black-and-white Warbler in Alabama is projected to fall about 14% by 2029 — from 0.58 in 2024 to a central estimate of 0.50 (95% range 0.20–0.79). A 5-year backtest shows a typical error of ±27.2%, with 80% of held-out values landing inside the 95% band.19662029
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 →
20250.500.200.79
20260.500.200.79
20270.500.200.79
20280.500.200.79
20290.500.200.79

Black-and-white Warbler Survey Routes in Alabama

Routes recording Black-and-white Warbler 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 →
Grove Hill519831983
Sunny Eve420241966
Howard420241982
Liberty City 2420242018
Borden Sprng419981993
Vina420231996
Millerville320241969
Maytown320151966
Cottonton320241981
Mentone320221993
Wheeler Dam320091993
St Florian220241968
Swaim220192011
Liberty220181978
Riderwood220231972
Greensboro220221968
Warrior Std220241984
Nixburg 2220222001
Millry219921970
Liberty City220112003
Elamville220242011
Childersburg219851985
Youngtown220211993
Woodville220242007
Eufaula220242013

Black-and-white Warbler Population Trend in Other States

arkansascaliforniaconnecticutdelawaregeorgiaillinoisindianakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourinebraskanew-hampshirenew-jerseynew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniarhode-islandsouth-carolinatennesseetexasvermontvirginiawest-virginiawisconsinwyoming

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