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Species · Louisiana · BBS 2026 Release · 1966–2025

Black-and-white Warbler Population Trend in Louisiana

All statesForest birds

Black-and-white Warbler in Louisiana has increased: up 40% on the route-weighted index since 1969.

+40%Since 1969TrendPercent 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 →
36Routes 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 →
57YearsYears 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 LouisianaNotable 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 Louisiana. See the full index history below.

Black-and-white Warbler Population Forecast in Louisiana

If the recent trend holds, Black-and-white Warbler in Louisiana is projected to stay roughly flat through 2030, near 0.29 (95% range 0.00–0.74). A 5-year backtest shows a typical error of ±64.7%, with 60% of held-out values landing inside the 95% band.

+3%Change by 2030TrendPercent 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 →
0.29Projected 2030 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–0.7495% 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 →
±64.7%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 Louisiana is projected to stay roughly flat through 2030, near 0.29 (95% range 0.00–0.74). A 5-year backtest shows a typical error of ±64.7%, with 60% of held-out values landing inside the 95% band.19672030
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 →
20260.290.000.75
20270.290.000.75
20280.290.000.75
20290.290.000.75
20300.290.000.74

Black-and-white Warbler Survey Routes in Louisiana

Routes recording Black-and-white Warbler in Louisiana.
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 →
Carterville1319921992
Chatham619731967
Marion619951988
Evelyn620242009
Linville420241998
Clay320231973
Mount Union320251998
Ivan 2320162014
Plettenberg220021973
Ivan220121998
Trout220231994
Goodwill220252004
Womack220251999
Haughton120221990
Fort Jessup120221998
Easton119821968
Derry119881969
Fishville120111970
Cypress119811970
Fort Polk119711971
Longstreet120241967
Fillmore119861970
Lake Cove120152013
Greensburg119991999
Many119891989

Black-and-white Warbler Population Trend in Other States

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

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