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

Dickcissel Population Trend in Louisiana

All statesGrassland birds

Dickcissel in Louisiana has collapsed: down 81% on the route-weighted index since 1969.

-81%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 →
59Routes 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 →
57YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Dickcissel Trends in LouisianaNotable 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 →

Dickcissel has collapsed in Louisiana: down 81% on the route-weighted index since 1969.

Dickcissel Population Forecast in Louisiana

If the recent trend holds, Dickcissel in Louisiana is projected to rise about 221% by 2029 — from 0.54 in 2024 to a central estimate of 1.7 (95% range 0.00–4.6). A 5-year backtest shows a typical error of ±207.2%, with 100% of held-out values landing inside the 95% band.

+221%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 →
1.7Projected 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 →
0.00–4.695% 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 →
±207.2%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, Dickcissel in Louisiana is projected to rise about 221% by 2029 — from 0.54 in 2024 to a central estimate of 1.7 (95% range 0.00–4.6). A 5-year backtest shows a typical error of ±207.2%, 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 →
20251.90.004.8
20261.90.004.7
20271.80.004.7
20281.80.004.6
20291.70.004.6

Dickcissel Survey Routes in Louisiana

Routes recording Dickcissel in Louisiana.
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 →
Transylvania6320221998
Rayville4520081967
Ltl Chenier 23220112010
Mamou2819821967
Mer Rouge1820081967
Natchitoches1719911987
Fillmore1319891968
Ville Platte1320191988
Concord1120192006
Woodlawn720212008
Derry619891967
Mayflower520241967
Cypress519871967
Maurice520241988
De Quincy520211999
Hackberry 2520212021
River Road320241988
Shaw320241967
Clay320131970
Longstreet320071967
Enterprise320162011
Kaplan320231998
Oakdale319911991
Rayville 2320242009
Plettenberg219881988

Dickcissel Population Trend in Other States

alabamaarkansascoloradodelawaregeorgiaillinoisindianaiowakansaskentuckymarylandmichiganminnesotamississippimissourimontananebraskanew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniasouth-carolinasouth-dakotatennesseetexasvirginiawest-virginiawisconsinwyoming

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