BirdAnalyst
Species · BCR 19 · BBS 2025 Release · 1966–2024

Black-throated Sparrow In Central Mixed Grass Prairie

All regionsCentral Mixed Grass PrairieArid-land birds

Black-throated Sparrow in Central Mixed Grass Prairie has collapsed: down 77% on the route-weighted index since 1969.

-77%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 →
11Routes 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 →
44YearsYears 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 →

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 →

Black-throated Sparrow has collapsed in Central Mixed Grass Prairie: down 77% on the route-weighted index since 1969.

Forecast

If the recent trend holds, Black-throated Sparrow in Central Mixed Grass Prairie is projected to rise about 69% by 2029 — from 0.09 in 2024 to a central estimate of 0.15 (95% range 0.00–0.42). A 5-year backtest shows a typical error of ±59.7%, with 100% of held-out values landing inside the 95% band.

+69%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 →
0.15Projected 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 →
0.00–0.4295% 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 →
±59.7%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, Black-throated Sparrow in Central Mixed Grass Prairie is projected to rise about 69% by 2029 — from 0.09 in 2024 to a central estimate of 0.15 (95% range 0.00–0.42). A 5-year backtest shows a typical error of ±59.7%, 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 →
20250.150.000.42
20260.150.000.42
20270.150.000.42
20280.150.000.42
20290.150.000.42

Routes In Central Mixed Grass Prairie

Routes recording Black-throated Sparrow in Central Mixed Grass Prairie.
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 →
MertzonTEXAS92019
WinchellTEXAS42023
SilverTEXAS42024
Shields 2TEXAS42016
EldoradoTEXAS32023
Mertzon 2TEXAS32022
Pear ValleyTEXAS22024
ShieldsTEXAS22001
ChesterOKLAHOMA11984
ChildressTEXAS11974
WallTEXAS12019

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