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Species · Florida · BBS 2025 Release · 1966–2024

Pied-billed Grebe Population Trend in Florida

All statesWetland birds

Pied-billed Grebe in Florida has collapsed: down 89% on the route-weighted index since 1968.

-89%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 →
51Routes 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 Pied-billed Grebe 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 declinecomputed 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 →

Pied-billed Grebe has collapsed in Florida: down 89% on the route-weighted index since 1968.

Pied-billed Grebe Population Forecast in Florida

If the recent trend holds, Pied-billed Grebe in Florida is projected to stay roughly flat through 2029, near 0.00 (95% range 0.00–0.56). A 5-year backtest shows a typical error of ±524%, with 100% of held-out values landing inside the 95% band.

n/aChange 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 →
0.00Projected 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 →
0.00–0.5695% 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 →
±524%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, Pied-billed Grebe in Florida is projected to stay roughly flat through 2029, near 0.00 (95% range 0.00–0.56). A 5-year backtest shows a typical error of ±524%, 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 →
20250.000.000.56
20260.000.000.56
20270.000.000.56
20280.000.000.56
20290.000.000.56

Pied-billed Grebe Survey Routes in Florida

Routes recording Pied-billed Grebe 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 →
Devils Gardn419961996
Webb319911991
Holey Land320091997
Winter Gardn320072007
Sandy319961989
Lake Buffum220051987
Ft Waltn Bch219901989
Punta Gorda219801980
Covington219871967
Corbett220121989
Scottsmoor219901969
Sunniland Gr219691966
Ft Lonesome220052005
Kenansville220031968
Salvista219711969
Tamiami219741966
Flemington219931992
Miccosukee120242024
Lovedale120091987
Croom120051998
Wildernes Pk120121992
Belmont120091992
Romeo119951995
St Augustine119671967
Merritt Isl120041992

Pied-billed Grebe Population Trend in Other States

alabamaalaskaarizonaarkansascaliforniacoloradoconnecticutdelawaregeorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniasouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwisconsinwyoming

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