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

Pine Siskin Population Trend in Maine

All statesGeneralists

Pine Siskin in Maine has fallen sharply: down 53% on the route-weighted index since 1968.

-53%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 →
56Routes 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 →
48YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Pine Siskin Trends in MaineNotable 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 →

Pine Siskin has fallen sharply in Maine: down 53% on the route-weighted index since 1968.

Pine Siskin Population Forecast in Maine

If the recent trend holds, Pine Siskin in Maine is projected to rise about 205% by 2023 — from 0.15 in 2018 to a central estimate of 0.45 (95% range 0.00–2.5). A 5-year backtest shows a typical error of ±526%, with 100% of held-out values landing inside the 95% band.

+205%Change by 2023TrendPercent 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 →
0.45Projected 2023 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–2.595% 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 →
±526%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, Pine Siskin in Maine is projected to rise about 205% by 2023 — from 0.15 in 2018 to a central estimate of 0.45 (95% range 0.00–2.5). A 5-year backtest shows a typical error of ±526%, with 100% of held-out values landing inside the 95% band.19662023
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 →
20190.490.002.5
20200.480.002.5
20210.470.002.5
20220.460.002.5
20230.450.002.5

Pine Siskin Survey Routes in Maine

Routes recording Pine Siskin in Maine.
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 →
Cambridge9020011992
Hartford2020162001
Seboomook Lk1519971972
Pillsbury Pd1319681968
Heron Lake1320011984
Northfield1219801978
Charleston1219921992
Boundary1019971997
Aurora619921988
Hudson619921990
Telos619951995
Hancock520121976
Yankeetuladi519971997
Weeks Brook420051997
Priestly Br.420011995
Northfield 2319981998
Wilson Mills320181983
Topsfield319921978
Moose River319991984
Carrabassett320161984
Winn320151969
Grnd Lk Strm319921991
Waite319771977
Forest Sta319991966
Ludlow319981968

Pine Siskin Population Trend in Other States

alaskaarizonacaliforniacoloradoconnecticutidahoiowamarylandmassachusettsmichiganminnesotamontananebraskanevadanew-hampshirenew-mexiconew-yorknorth-carolinanorth-dakotaohiooregonpennsylvaniarhode-islandsouth-dakotatennesseeutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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