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Species · Ohio · BBS 2025 Release · 1966–2024

Marsh Wren Population Trend in Ohio

All statesForest birds

Marsh Wren in Ohio has edged down: down 19% on the route-weighted index since 1974.

-19%Since 1974TrendPercent 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 →
9Routes 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 →
18YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Marsh Wren Trends in OhioNotable 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 Marsh Wren in Ohio. See the full index history below.

Marsh Wren Population Forecast in Ohio

If the recent trend holds, Marsh Wren in Ohio is projected to stay roughly flat through 2003, near 0.05 (95% range 0.00–0.12). A 5-year backtest shows a typical error of ±91.7%, with 100% of held-out values landing inside the 95% band.

n/aChange by 2003TrendPercent 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 →
0.05Projected 2003 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–0.1295% 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 →
±91.7%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, Marsh Wren in Ohio is projected to stay roughly flat through 2003, near 0.05 (95% range 0.00–0.12). A 5-year backtest shows a typical error of ±91.7%, with 100% of held-out values landing inside the 95% band.19662003
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 →
19990.050.000.12
20000.050.000.12
20010.050.000.12
20020.050.000.12
20030.050.000.12

Marsh Wren Survey Routes in Ohio

Routes recording Marsh Wren in Ohio.
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 →
Bolins Mills319971997
Herner Crns219881988
New Somerset219871987
Bloomville119971997
Graytown119661966
Fulton119741974
Limestone119861986
Middlefield119981973
Strongsville119731973

Marsh Wren Population Trend in Other States

alabamaarizonacaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaslouisianamainemarylandmassachusettsmichiganminnesotamissourimontananebraskanevadanew-hampshirenew-jerseynew-yorknorth-carolinanorth-dakotaoregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatexasutahvermontvirginiawashingtonwisconsinwyoming

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