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Species · Louisiana · BBS 2025 Release · 1966–2024

White-faced Ibis Population Trend in Louisiana

All statesWetland birds

White-faced Ibis in Louisiana has surged: up 129% on the route-weighted index since 1970.

+129%Since 1970TrendPercent 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 →
33Routes 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 White-faced Ibis 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 →

long arc increasecomputed 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 →

White-faced Ibis has surged in Louisiana: up 129% on the route-weighted index since 1970.

White-faced Ibis Population Forecast in Louisiana

If the recent trend holds, White-faced Ibis in Louisiana is projected to rise about 299% by 2029 — from 3.5 in 2024 to a central estimate of 14 (95% range 0.00–30). A 5-year backtest shows a typical error of ±124.6%, with 100% of held-out values landing inside the 95% band.

+299%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 →
14Projected 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 →
0.00–3095% 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 →
±124.6%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, White-faced Ibis in Louisiana is projected to rise about 299% by 2029 — from 3.5 in 2024 to a central estimate of 14 (95% range 0.00–30). A 5-year backtest shows a typical error of ±124.6%, with 100% of held-out values landing inside the 95% band.19672029
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 →
2025130.0029
2026130.0029
2027140.0029
2028140.0030
2029140.0030

White-faced Ibis Survey Routes in Louisiana

Routes recording White-faced Ibis 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 →
Creole15219801967
Kaplan8520231998
Ville Platte6120191988
Mamou4619681968
Port Allen3520242013
Esther3420241988
Gran Chenier3019801967
Woodlawn2820212008
Flat Creek2520002000
Ltl Chenier2420241988
Glencoe2220012001
Richard1720241998
Morgan City1620142012
De Quincy1520042004
Forked Island 21220112010
Maurice1220241988
Forked Island1220242008
Vinton 2920162016
Keystone820121991
Frogmore720242006
Atchafalaya520152009
Ramah420212011
Kraemer420102010
Lafitte319671967
Mayflower320232022

White-faced Ibis Population Trend in Other States

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