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Species · BCR 26 · BBS 2026 Release · 1966–2025

Summer Tanager In Mississippi Alluvial Valley

All regionsMississippi Alluvial ValleyForest birds

Summer Tanager in Mississippi Alluvial Valley has surged: up 82% on the route-weighted index since 1968.

+82%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 →
67Routes 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 →

Summer Tanager has surged in Mississippi Alluvial Valley: up 82% on the route-weighted index since 1968.

Summer Tanager In Mississippi Alluvial Valley Population Forecast

If the recent trend holds, Summer Tanager in Mississippi Alluvial Valley is projected to rise about 15% by 2030 — from 3.8 in 2025 to a central estimate of 4.4 (95% range 3.1–5.7). A 5-year backtest shows a typical error of ±3.8%, with 100% of held-out values landing inside the 95% band.

+15%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 →
4.4Projected 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 →
3.1–5.795% 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 →
±3.8%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, Summer Tanager in Mississippi Alluvial Valley is projected to rise about 15% by 2030 — from 3.8 in 2025 to a central estimate of 4.4 (95% range 3.1–5.7). A 5-year backtest shows a typical error of ±3.8%, 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 →
20264.22.95.5
20274.23.05.5
20284.33.05.6
20294.33.15.6
20304.43.15.7

Routes In Mississippi Alluvial Valley

Routes recording Summer Tanager in Mississippi Alluvial Valley.
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 →
Delta N.F.MISSISSIPPI302021
AtchafalayaLOUISIANA272025
Crowley'S RidgeARKANSAS152025
Tensas NwrLOUISIANA152025
TallahatchieMISSISSIPPI112025
Dahomey NwrMISSISSIPPI92025
ShawLOUISIANA82024
FrogmoreLOUISIANA72025
CommerceMISSISSIPPI71993
Bardwell 2KENTUCKY62025
Tchula 2MISSISSIPPI61994
South BendARKANSAS52025
SaffellARKANSAS52019
BardwellKENTUCKY52003
RamahLOUISIANA52025
GonzalesLOUISIANA52019
ConcordLOUISIANA52019
Panther Swamp NwrMISSISSIPPI52018
EnglandARKANSAS42025
Augusta 2ARKANSAS42016
MayflowerLOUISIANA42025
IsolaMISSISSIPPI42022
WintervilleMISSISSIPPI42011
TippoMISSISSIPPI42025
Cp GirardeauMISSOURI42025

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