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Species · Tennessee · BBS 2025 Release · 1966–2024

Bewick's Wren Population Trend in Tennessee

All statesForest birds

Bewick's Wren in Tennessee has collapsed: down 95% on the route-weighted index since 1968.

-95%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 →
31Routes 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 →
31YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Bewick's Wren Trends in TennesseeNotable 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 →

Bewick's Wren has collapsed in Tennessee: down 95% on the route-weighted index since 1968.

Bewick's Wren Population Forecast in Tennessee

If the recent trend holds, Bewick's Wren in Tennessee is projected to stay roughly flat through 2010, near 0.00 (95% range 0.00–0.39). A 5-year backtest shows a typical error of ±1031.3%, with 80% of held-out values landing inside the 95% band.

n/aChange by 2010TrendPercent 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 →
0.00Projected 2010 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–0.3995% 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 →
±1031.3%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, Bewick's Wren in Tennessee is projected to stay roughly flat through 2010, near 0.00 (95% range 0.00–0.39). A 5-year backtest shows a typical error of ±1031.3%, with 80% of held-out values landing inside the 95% band.19662010
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 →
20060.000.000.39
20070.000.000.39
20080.000.000.39
20090.000.000.39
20100.000.000.39

Bewick's Wren Survey Routes in Tennessee

Routes recording Bewick's Wren in Tennessee.
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 →
Petersburg519701967
Silerton319801976
Silver Pt319761966
Tibbs219721966
Sweetlips219881970
Humboldt219701966
Indian Mound219961968
Collinwood219861966
Glen219761967
Climer219681967
Allens Brdge219761966
Moscow119681968
Brownsville119761967
Whiteville119751974
Big Sandy119771966
Mansfield119871966
Pond Creek119701966
Wrigley119741966
Campbellsville119971967
Lewis Forest119771966
Belotes Bend120051966
Peytonsville119981973
Bradyville119741967
Tullahoma119791967
Union Hill119941967

Bewick's Wren Population Trend in Other States

alabamaarizonaarkansascaliforniacoloradoidahoillinoisindianaiowakansaskentuckymarylandmississippimissourinevadanew-mexiconorth-carolinaohiooklahomaoregonpennsylvaniatexasutahvirginiawashingtonwest-virginiawisconsinwyoming

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