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Species · New Mexico · BBS 2025 Release · 1966–2024

Williamson's Sapsucker Population Trend in New Mexico

All statesForest birds

Williamson's Sapsucker in New Mexico has edged down: down 21% on the route-weighted index since 1984.

-21%Since 1984TrendPercent 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 StateSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
32YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Williamson's Sapsucker Trends in New MexicoNotable 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 Williamson's Sapsucker in New Mexico. See the full index history below.

Williamson's Sapsucker Population Forecast in New Mexico

If the recent trend holds, Williamson's Sapsucker in New Mexico is projected to stay roughly flat through 2029, near 0.06 (95% range 0.00–0.16). A 5-year backtest shows a typical error of ±35.7%, with 100% of held-out values landing inside the 95% band.

n/aChange 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 →
0.06Projected 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 →
0.00–0.1695% 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 →
±35.7%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, Williamson's Sapsucker in New Mexico is projected to stay roughly flat through 2029, near 0.06 (95% range 0.00–0.16). A 5-year backtest shows a typical error of ±35.7%, with 100% of held-out values landing inside the 95% band.19772029
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 →
20250.060.000.17
20260.060.000.17
20270.060.000.17
20280.060.000.16
20290.060.000.16

Williamson's Sapsucker Survey Routes in New Mexico

Routes recording Williamson's Sapsucker in New Mexico.
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 →
Cebolla220211977
Bluewater Lake220191999
Angel Fire220011993
Ojo Sarco119891984
Angel Fire 2120192006
Gallinas120172011
Dulce120192019
Mt. Taylor120111993
Vallecitos120241994
Cloudcroft120102010
Mt. Taylor 2120242014

Williamson's Sapsucker Population Trend in Other States

arizonacaliforniacoloradoidahomontananevadaoregonutahwashingtonwyoming

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