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Species · BCR 14 · BBS 2026 Release · 1966–2025

Warbling Vireo In Atlantic Northern Forest

All regionsAtlantic Northern ForestForest birds

Warbling Vireo in Atlantic Northern Forest has surged: up 92% on the route-weighted index since 1968.

+92%Since 1968TrendPercent 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 →
139Routes 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 →
59YearsYears 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 Atlantic Northern Forest: up 92% on the route-weighted index since 1968.

Warbling Vireo In Atlantic Northern Forest Population Forecast

If the recent trend holds, Warbling Vireo in Atlantic Northern Forest is projected to stay roughly flat through 2030, near 1.4 (95% range 0.77–2.1). A 5-year backtest shows a typical error of ±4.6%, with 100% of held-out values landing inside the 95% band.

+1%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 →
1.4Projected 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 →
0.77–2.195% 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 →
±4.6%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 Atlantic Northern Forest is projected to stay roughly flat through 2030, near 1.4 (95% range 0.77–2.1). A 5-year backtest shows a typical error of ±4.6%, with 100% of held-out values landing inside the 95% band.19662030
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 →
20261.40.752.1
20271.40.762.1
20281.40.762.1
20291.40.762.1
20301.40.772.1

Routes In Atlantic Northern Forest

Routes recording Warbling Vireo in Atlantic Northern Forest.
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 →
FitzwilliamNEW-HAMPSHIRE132025
Otisfield GrMAINE112015
Seboomook LkMAINE112010
TurnerMAINE82010
ChesterfieldMASSACHUSETTS72025
MontereyMASSACHUSETTS72025
CornvilleMAINE62025
StacyvilleMAINE52023
ConcordNEW-HAMPSHIRE52025
MarlowNEW-HAMPSHIRE52024
S WallingfrdVERMONT52022
WatervilleVERMONT51980
MedwayMAINE42018
Turner 2MAINE42025
Dixvil NotchNEW-HAMPSHIRE42008
HighmarketNEW-YORK42025
W RutlandVERMONT42025
ManchesterMAINE31995
WarrenMAINE31990
NorthfieldMAINE31978
WashburnMAINE32005
Ft FairfieldMAINE32005
RomeMAINE32024
Lake MoxieMAINE32010
SearsportMAINE32025

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