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

Wetland Birds In New Jersey

All statesNew Jersey

24 species in this guild. As a group they are -3%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 wetland birds in New Jersey. See the full index history below.

Wetland Birds In New Jersey Population Forecast

If the recent trend holds, Wetland birds in New Jersey is projected to rise about 42% by 2030 — from 3.6 in 2025 to a central estimate of 5.1 (95% range 0.00–11). A 5-year backtest shows a typical error of ±25.2%, with 100% of held-out values landing inside the 95% band.

+42%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 →
5.1Projected 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 →
0.00–1195% 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 →
±25.2%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, Wetland birds in New Jersey is projected to rise about 42% by 2030 — from 3.6 in 2025 to a central estimate of 5.1 (95% range 0.00–11). A 5-year backtest shows a typical error of ±25.2%, with 100% 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 →
20265.10.0011
20275.10.0011
20285.10.0011
20295.10.0011
20305.10.0011

Member Species In New Jersey

Wetland birds 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 →
Black SkimmerLaridae-92%
Least TernLaridae-89%
Common TernLaridae-88%
Swamp SparrowPasserellidae-80%
Snowy EgretArdeidae-74%
Tricolored HeronArdeidae-57%
Little Blue HeronArdeidae-56%
Forster's TernLaridae-55%
Black-crowned Night HeronArdeidae-55%
Belted KingfisherAlcedinidae-52%
Green HeronArdeidae-44%
Yellow-crowned Night HeronArdeidae-29%
Red-winged BlackbirdIcteridae-10%
Western Cattle-EgretArdeidae-5%
Great EgretArdeidae+12%
Clapper RailRallidae+58%
Ring-billed GullLaridae+78%
Double-crested CormorantPhalacrocoracidae+88%
Boat-tailed GrackleIcteridae+110%
Great Blue HeronArdeidae+374%
Great Black-backed GullLaridae+397%
Glossy IbisThreskiornithidae+606%
Laughing GullLaridae13×
Herring GullLaridae56×

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