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Species · South Carolina · BBS 2025 Release · 1966–2024

White Ibis Population Trend in South Carolina

All statesWetland birds

White Ibis in South Carolina has declined: down 26% on the route-weighted index since 1968.

-26%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 →
19Routes 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 →
51YearsYears 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 Ibis Trends in South CarolinaNotable 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 White Ibis in South Carolina. See the full index history below.

White Ibis Population Forecast in South Carolina

If the recent trend holds, White Ibis in South Carolina is projected to fall about 18% by 2029 — from 1.9 in 2024 to a central estimate of 1.5 (95% range 0.00–12). A 5-year backtest shows a typical error of ±172.4%, with 100% of held-out values landing inside the 95% band.

-18%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 →
1.5Projected 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 →
0.00–1295% 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 →
±172.4%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 Ibis in South Carolina is projected to fall about 18% by 2029 — from 1.9 in 2024 to a central estimate of 1.5 (95% range 0.00–12). A 5-year backtest shows a typical error of ±172.4%, 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 →
20251.70.0012
20261.60.0012
20271.60.0012
20281.60.0012
20291.50.0012

White Ibis Survey Routes in South Carolina

Routes recording White Ibis in South Carolina.
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 →
Nixonville2819921988
Nixville2820171998
Kiawah Island2220242017
Carvers Bay820061999
Dale820241998
Holly Hill720241975
Bennettsville620172014
Foreston520211971
Olar520171998
Johns Isle319791966
Hardeeville320221967
Rome320111988
Bishopville320221985
Walterboro320171970
Adams Run320231999
Wagener220241985
Jamestown120041969
Dillon119741974
Pinewood120081999

White Ibis Population Trend in Other States

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