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Species · Florida · BBS 2025 Release · 1966–2024

Glossy Ibis Population Trend in Florida

All statesWetland birds

Glossy Ibis in Florida has surged: up 327% on the route-weighted index since 1969.

+327%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 →
63Routes 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 →
53YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Glossy Ibis Trends in FloridaNotable 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 →

Glossy Ibis has surged in Florida: up 327% on the route-weighted index since 1969.

Glossy Ibis Population Forecast in Florida

If the recent trend holds, Glossy Ibis in Florida is projected to rise about 71% by 2029 — from 1.6 in 2024 to a central estimate of 2.7 (95% range 0.81–4.5). A 5-year backtest shows a typical error of ±55.3%, with 100% of held-out values landing inside the 95% band.

+71%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 →
2.7Projected 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 →
0.81–4.595% 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 →
±55.3%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, Glossy Ibis in Florida is projected to rise about 71% by 2029 — from 1.6 in 2024 to a central estimate of 2.7 (95% range 0.81–4.5). A 5-year backtest shows a typical error of ±55.3%, with 100% 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 →
20252.50.654.4
20262.50.694.4
20272.60.734.4
20282.60.774.5
20292.70.814.5

Glossy Ibis Survey Routes in Florida

Routes recording Glossy Ibis in Florida.
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 →
Clewiston6020232016
Holey Land5020241993
Broward4219711966
Mabel 23020192013
Shawano 22320112004
Shawano2320011988
Dupuis W.E.A2220082000
Indiantown 22020222018
Ridge Harbor1720241998
Myakka Head 21620212012
Kissimmee1520171999
Cross City1520192019
Aripeka1520222022
Sandy1420151990
Alva1320232012
Andytown1219871974
Pennywash Cr1120091993
Green Swamp1020011997
Homestead1020232022
Polk City820191980
Webb720241998
Winter Gardn720192005
Weaver Stn520191992
Scottsmoor420241969
Alligator Pt419971997

Glossy Ibis Population Trend in Other States

alabamaconnecticutdelawaregeorgialouisianamainemarylandmassachusettsnew-hampshirenew-jerseynew-yorknorth-carolinarhode-islandsouth-carolinasouth-dakotatexasvirginia

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