BirdAnalyst
Species · Iowa · BBS 2025 Release · 1966–2024

Eurasian Collared-Dove Population Trend in Iowa

All statesGeneralists

Eurasian Collared-Dove in Iowa has surged: up 51× on the route-weighted index since 2005.

51×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 →
21YearsYears 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 51× 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 stay roughly flat through 2029, near 6.7 (95% range 5.1–8.2). A 5-year backtest shows a typical error of ±27.5%, with 20% of held-out values landing inside the 95% band.

-1%Change by 2029TrendPercent 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 →
6.7Projected 2029 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
5.1–8.295% 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 →
±27.5%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 stay roughly flat through 2029, near 6.7 (95% range 5.1–8.2). A 5-year backtest shows a typical error of ±27.5%, with 20% of held-out values landing inside the 95% band.20002029
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 →
20255.54.07.1
20265.84.37.4
20276.14.57.7
20286.44.87.9
20296.75.18.2

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 →
West Liberty2820242009
Red Rock2720242004
Rock Valley1520242015
Sioux City1420242009
College Spgs 21420232008
Panther1120242009
Festina920242019
Brooklyn820222012
Prairieburg720242011
Burchinal520242009
Dinsdale520242013
Scranton520242016
Mccallsburg520242018
Bryant420242009
Washington420232004
Pierson420192013
Davis Corner420242015
Melrose320212012
Williamsburg320232007
Gaza320232017
Tipton320242021
Mt Hamill220242016
Wales220182014
Maquoketa220232009
Kanawha220242015

Eurasian Collared-Dove Population Trend in Other States

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

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