BirdAnalyst
Species · BCR 35 · BBS 2026 Release · 1966–2025

Warbling Vireo In Chihuahuan Desert

All regionsChihuahuan DesertForest birds

Warbling Vireo in Chihuahuan Desert has surged: up 76% on the route-weighted index since 1982.

+76%Since 1982TrendPercent 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 →
8Routes 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 →
41YearsYears 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 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 →

Warbling Vireo has surged in Chihuahuan Desert: up 76% on the route-weighted index since 1982.

Warbling Vireo In Chihuahuan Desert Population Forecast

If the recent trend holds, Warbling Vireo in Chihuahuan Desert is projected to fall about 32% by 2030 — from 2.2 in 2025 to a central estimate of 1.5 (95% range 0.15–2.8). A 5-year backtest shows a typical error of ±50.6%, with 80% of held-out values landing inside the 95% band.

-32%Change by 2030TrendPercent 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 2030 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.15–2.895% 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 →
±50.6%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, Warbling Vireo in Chihuahuan Desert is projected to fall about 32% by 2030 — from 2.2 in 2025 to a central estimate of 1.5 (95% range 0.15–2.8). A 5-year backtest shows a typical error of ±50.6%, with 80% of held-out values landing inside the 95% band.19782030
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 →
20261.50.132.8
20271.50.142.8
20281.50.142.8
20291.50.152.8
20301.50.152.8

Routes In Chihuahuan Desert

Routes recording Warbling Vireo in Chihuahuan Desert.
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 →
CloudcroftNEW-MEXICO742025
Red RockNEW-MEXICO32025
CarrizozoNEW-MEXICO12002
LaborcitaNEW-MEXICO12018
MesillaNEW-MEXICO11997
PinonNEW-MEXICO12024
QueenNEW-MEXICO11999
Sunshine WllNEW-MEXICO12025

Source: USGS North American Breeding Bird Survey, retrieved 2026-08-14.