BirdAnalyst
Species · Iowa · BBS 2026 Release · 1966–2025

Eurasian Collared-Dove Population Trend in Iowa

All statesGeneralists

Eurasian Collared-Dove in Iowa has surged: up 55× on the route-weighted index since 2005.

55×Since 2005TrendPercent 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 →
33Routes 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 →
22YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Eurasian Collared-Dove Trends in IowaNotable 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 →

Eurasian Collared-Dove has surged in Iowa: up 55× on the route-weighted index since 2005.

Eurasian Collared-Dove Population Forecast in Iowa

If the recent trend holds, Eurasian Collared-Dove in Iowa is projected to rise about 35% by 2030 — from 5.1 in 2025 to a central estimate of 6.8 (95% range 5.3–8.4). A 5-year backtest shows a typical error of ±20.5%, with 40% of held-out values landing inside the 95% band.

+35%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 →
6.8Projected 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 →
5.3–8.495% 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 →
±20.5%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, Eurasian Collared-Dove in Iowa is projected to rise about 35% by 2030 — from 5.1 in 2025 to a central estimate of 6.8 (95% range 5.3–8.4). A 5-year backtest shows a typical error of ±20.5%, with 40% of held-out values landing inside the 95% band.20002030
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 →
20265.74.27.3
20276.04.57.5
20286.34.77.8
20296.65.08.1
20306.85.38.4

Eurasian Collared-Dove Survey Routes in Iowa

Routes recording Eurasian Collared-Dove in Iowa.
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 →
Panther1420252009
Festina1420252019
Rock Valley1320252015
Bryant1220252009
Prairieburg1020252011
Dinsdale920252013
Brooklyn820222012
Sioux City820252009
Red Rock720252004
Pierson720252013
Davis Corner720252015
Gaza720252017
Scranton620252016
Washta620252008
Washington520252004
Melrose420252012
West Liberty420252009
Neola420252011
Williamsburg320232007
Titonka320252021
Tipton320252021
Mt Hamill220242016
Exline220252007
Wales220182014
Maquoketa220252009

Eurasian Collared-Dove Population Trend in Other States

alabamaalaskaarizonaarkansascaliforniacoloradofloridageorgiaidahoillinoisindianakansaskentuckylouisianamarylandmichiganminnesotamississippimissourimontananebraskanevadanew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniasouth-carolinasouth-dakotatennesseetexasutahvirginiawashingtonwisconsinwyoming

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