BirdAnalyst
Guild · New Jersey · BBS 2026 Release · 1966–2025

Aerial Insectivores In New Jersey

All statesNew Jersey

17 species in this guild. As a group they are -4%Guild trendA mean-index aggregate across the species in this group — the structural direction of the guild, with individual-species noise smoothed out.Full methodology → since 1968.

Guild SignalsNotable 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 aerial insectivores in New Jersey. See the full index history below.

Aerial Insectivores In New Jersey Population Forecast

If the recent trend holds, Aerial insectivores in New Jersey is projected to fall about 23% by 2030 — from 3.7 in 2025 to a central estimate of 2.8 (95% range 1.9–3.7). A 5-year backtest shows a typical error of ±18.5%, with 60% of held-out values landing inside the 95% band.

-23%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 →
2.8Projected 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 →
1.9–3.795% 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 →
±18.5%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, Aerial insectivores in New Jersey is projected to fall about 23% by 2030 — from 3.7 in 2025 to a central estimate of 2.8 (95% range 1.9–3.7). A 5-year backtest shows a typical error of ±18.5%, with 60% of held-out values landing inside the 95% band.19662030
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 →
20262.91.93.8
20272.81.93.8
20282.81.93.7
20292.81.93.7
20302.81.93.7

Member Species In New Jersey

Aerial insectivores species in New Jersey.
TrendPercent 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 →
Bank SwallowHirundinidae-67%
Least FlycatcherTyrannidae-66%
Purple MartinHirundinidae-55%
Cliff SwallowHirundinidae-48%
Eastern KingbirdTyrannidae-46%
Eastern Whip-poor-willCaprimulgidae-38%
Barn SwallowHirundinidae-18%
Chimney SwiftApodidae-17%
Alder FlycatcherTyrannidae-10%
Common NighthawkCaprimulgidae-1%
Great Crested FlycatcherTyrannidae+18%
Northern Rough-winged SwallowHirundinidae+28%
Tree SwallowHirundinidae+42%
Willow FlycatcherTyrannidae+78%
Eastern PhoebeTyrannidae+193%
Eastern Wood-PeweeTyrannidae+476%
Acadian FlycatcherTyrannidae+599%

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