BirdAnalyst
Guild · Louisiana · BBS 2026 Release · 1966–2025

Wetland Birds In Louisiana

All statesLouisiana

36 species in this guild. As a group they are -25%Guild trendA mean-index aggregate across the species in this group — the structural direction of the guild, with individual-species noise smoothed out.Full methodology → since 1969.

Guild SignalsNotable 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 wetland birds in Louisiana. See the full index history below.

Wetland Birds In Louisiana Population Forecast

If the recent trend holds, Wetland birds in Louisiana is projected to stay roughly flat through 2030, near 5.4 (95% range 0.98–9.7). A 5-year backtest shows a typical error of ±19%, with 100% of held-out values landing inside the 95% band.

-7%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 →
5.4Projected 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 →
0.98–9.795% 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 →
±19%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, Wetland birds in Louisiana is projected to stay roughly flat through 2030, near 5.4 (95% range 0.98–9.7). A 5-year backtest shows a typical error of ±19%, with 100% 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 →
20265.71.310
20275.61.210.0
20285.51.19.9
20295.41.19.8
20305.40.989.7

Member Species In Louisiana

Wetland birds species in Louisiana.
TrendPercent 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 →
American CootRallidae-99%
Snowy EgretArdeidae-90%
Forster's TernLaridae-87%
Great-tailed GrackleIcteridae-80%
King RailRallidae-80%
Royal TernLaridae-65%
Common TernLaridae-63%
Neotropic CormorantPhalacrocoracidae-62%
Least TernLaridae-62%
Gull-billed TernLaridae-49%
Belted KingfisherAlcedinidae-36%
Laughing GullLaridae-33%
Double-crested CormorantPhalacrocoracidae-32%
Little Blue HeronArdeidae-32%
Green HeronArdeidae-31%
Red-winged BlackbirdIcteridae-27%
Wood StorkCiconiidae-25%
Caspian TernLaridae-17%
Brown PelicanPelecanidae-5%
Pied-billed GrebePodicipedidae+27%
Black-crowned Night HeronArdeidae+36%
White-faced IbisThreskiornithidae+41%
Western Cattle-EgretArdeidae+69%
AnhingaAnhingidae+100%
Tricolored HeronArdeidae+111%
Great Blue HeronArdeidae+126%
Boat-tailed GrackleIcteridae+132%
Yellow-crowned Night HeronArdeidae+140%
Purple GallinuleRallidae+169%
Great EgretArdeidae+211%
White IbisThreskiornithidae+447%
Least BitternArdeidae+501%
Clapper RailRallidae+545%
Roseate SpoonbillThreskiornithidae+594%
Common GallinuleRallidae+601%
Seaside SparrowPasserellidae19×

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