BirdAnalyst
Species · BCR 27 · BBS 2025 Release · 1966–2024

Pied-billed Grebe In Southeastern Coastal Plain

All regionsSoutheastern Coastal PlainWetland birds

Pied-billed Grebe in Southeastern Coastal Plain has declined: down 48% on the route-weighted index since 1971.

-48%Since 1971TrendPercent 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 →
35Routes In RegionSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
47YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable 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 Pied-billed Grebe in Southeastern Coastal Plain. See the full index history below.

Pied-billed Grebe In Southeastern Coastal Plain Population Forecast

If the recent trend holds, Pied-billed Grebe in Southeastern Coastal Plain is projected to stay roughly flat through 2029, near 0.01 (95% range 0.00–0.05). A 5-year backtest shows a typical error of ±120.2%, 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 →
0.01Projected 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 →
0.00–0.0595% 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 →
±120.2%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 Southeastern Coastal Plain is projected to stay roughly flat through 2029, near 0.01 (95% range 0.00–0.05). A 5-year backtest shows a typical error of ±120.2%, 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 →
20250.010.000.05
20260.010.000.05
20270.010.000.05
20280.010.000.05
20290.010.000.05

Routes In Southeastern Coastal Plain

Routes recording Pied-billed Grebe in Southeastern Coastal Plain.
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 →
Myrtle GroveNORTH-CAROLINA112004
MerrimonNORTH-CAROLINA61984
Fort AdamsMISSISSIPPI51995
BostonGEORGIA32014
Dauphin IsALABAMA21978
Rock ChapelALABAMA22021
Ft Waltn BchFLORIDA21990
CovingtonFLORIDA21987
PittsGEORGIA21987
DickeyGEORGIA22017
WhitevilleTENNESSEE22004
HumboldtTENNESSEE22009
GreensboroALABAMA11997
CastleberryALABAMA12012
Alabama PtALABAMA11975
FairviewALABAMA11990
HoltALABAMA12007
MiccosukeeFLORIDA12024
BelmontFLORIDA12009
BettsFLORIDA12011
Hixtown SwmpFLORIDA12005
PinettaFLORIDA12021
LovedaleFLORIDA12009
Eglin A.F.B.FLORIDA12000
St Vincent IFLORIDA12010

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