BirdAnalyst
Species · Mississippi · BBS 2025 Release · 1966–2024

Anhinga Population Trend in Mississippi

All statesGeneralists

Anhinga in Mississippi has surged: up 13× on the route-weighted index since 1973.

13×Since 1973TrendPercent 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 →
20Routes 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 →
35YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Anhinga Trends in MississippiNotable 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 →

Anhinga has surged in Mississippi: up 13× on the route-weighted index since 1973.

Anhinga Population Forecast in Mississippi

If the recent trend holds, Anhinga in Mississippi is projected to rise about 14% by 2029 — from 0.47 in 2024 to a central estimate of 0.54 (95% range 0.01–1.1). A 5-year backtest shows a typical error of ±79.1%, with 60% of held-out values landing inside the 95% band.

+14%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 →
0.54Projected 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 →
0.01–1.195% 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 →
±79.1%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, Anhinga in Mississippi is projected to rise about 14% by 2029 — from 0.47 in 2024 to a central estimate of 0.54 (95% range 0.01–1.1). A 5-year backtest shows a typical error of ±79.1%, with 60% of held-out values landing inside the 95% band.19692029
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 →
20250.500.001.0
20260.510.001.0
20270.520.001.0
20280.530.011.1
20290.540.011.1

Anhinga Survey Routes in Mississippi

Routes recording Anhinga in Mississippi.
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 →
Fort Adams619971991
Tchula 2619941994
Eagle Lake520242012
Star420212021
Tchula 3420241995
Dundee220102010
Delta N.F.220162015
Benndale220121999
Beverly120081969
Benton120232007
Isola120222021
Tippo120232007
Tallahatchie120192019
Columbia120031978
Cybur120132001
Corinth120232023
Macon120212021
Waynesboro120092009
Trace South120072007
Moon120142011

Anhinga Population Trend in Other States

alabamaarkansasfloridageorgialouisiananorth-carolinaoklahomasouth-carolinatexasvirginia

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