BirdAnalyst
Species · BCR 36 · BBS 2025 Release · 1966–2024

Dickcissel In Tamaulipan Brushlands

All regionsTamaulipan BrushlandsGrassland birds

Dickcissel in Tamaulipan Brushlands has held roughly steady: down 2% on the route-weighted index since 1970.

-2%Since 1970TrendPercent 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 →
25Routes 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 →
56YearsYears 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 Dickcissel in Tamaulipan Brushlands. See the full index history below.

Dickcissel In Tamaulipan Brushlands Population Forecast

If the recent trend holds, Dickcissel in Tamaulipan Brushlands is projected to fall about 31% by 2029 — from 7.3 in 2024 to a central estimate of 5.0 (95% range 0.00–24). A 5-year backtest shows a typical error of ±57.6%, with 100% of held-out values landing inside the 95% band.

-31%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 →
5.0Projected 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 →
0.00–2495% 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 →
±57.6%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 Tamaulipan Brushlands is projected to fall about 31% by 2029 — from 7.3 in 2024 to a central estimate of 5.0 (95% range 0.00–24). A 5-year backtest shows a typical error of ±57.6%, with 100% of held-out values landing inside the 95% band.19682029
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 →
20255.50.0024
20265.40.0024
20275.30.0024
20285.10.0024
20295.00.0024

Routes In Tamaulipan Brushlands

Routes recording Dickcissel in Tamaulipan Brushlands.
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 →
HondoTEXAS502024
RandadoTEXAS492015
La PryorTEXAS302017
George WestTEXAS252023
Pedro CreekTEXAS182004
HeidelbergTEXAS172024
Millett 2TEXAS152015
MillettTEXAS142012
RaymondvilleTEXAS132024
CatarinaTEXAS92010
Agua NuevaTEXAS72023
KingsvilleTEXAS62024
Mirando CityTEXAS61993
RachalTEXAS32019
El SauzTEXAS32015
Catarina 3TEXAS32018
SejitaTEXAS32019
Catarina 2TEXAS22013
DilleyTEXAS22024
ProgresoTEXAS22010
ZapataTEXAS11983
EncinalTEXAS12005
El IndioTEXAS11997
GuerraTEXAS12009
Encinal 2TEXAS12018

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