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

Alder Flycatcher Population Trend in Connecticut

All statesAerial insectivores

Alder Flycatcher in Connecticut has risen sharply: up 66% on the route-weighted index since 1976.

+66%Since 1976
13Routes In State
42Years

Notable Alder Flycatcher Trends in Connecticut

long arc increasecomputed index

Alder Flycatcher has risen sharply in Connecticut: up 65% on the route-weighted index since 1976.

Alder Flycatcher Population Forecast in Connecticut

If the recent trend holds, Alder Flycatcher in Connecticut is projected to stay roughly flat through 2029, near 0.37 (95% range 0.00–0.94). A 5-year backtest shows a typical error of ±84.4%, with 100% of held-out values landing inside the 95% band.

+10%Change by 2029
0.37Projected 2029 index
0.00–0.9495% range
±84.4%Backtest error
19742029
Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.
YearProjected index95% low95% high
20250.360.000.94
20260.360.000.94
20270.360.000.94
20280.360.000.94
20290.370.000.94

Alder Flycatcher Survey Routes in Connecticut

Routes recording Alder Flycatcher in Connecticut.
Warren420111974
Buckingham220092004
Woodstock 2220242017
New Hartford120231996
Willimantic119961974
No Woodbury120121982
Sherman120052005
Long Hill119741974
Mid Haddam119961990
Southington119741974
New Hartford119871981
Warren 2120242024
Granby120231990

Alder Flycatcher Population Trend in Other States

alaskaidahoillinoisindianaiowamainemarylandmassachusettsmichiganminnesotamontananew-hampshirenew-jerseynew-yorknorth-carolinanorth-dakotaohiooklahomapennsylvaniasouth-dakotavermontvirginiawashingtonwest-virginiawisconsin

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