Species · New Jersey · BBS 2025 Release · 1966–2024
Vesper Sparrow Population Trend in New Jersey
Vesper Sparrow in New Jersey has fallen sharply: down 67% on the route-weighted index since 1968.
-67%Since 1968
11Routes In State
24Years
Notable Vesper Sparrow Trends in New Jersey
long arc declinecomputed index
Vesper Sparrow has fallen sharply in New Jersey: down 67% on the route-weighted index since 1968.
Vesper Sparrow Population Forecast in New Jersey
If the recent trend holds, Vesper Sparrow in New Jersey is projected to fall about 89% by 2007 — from 0.05 in 2002 to a central estimate of 0.01 (95% range 0.00–0.17). A 5-year backtest shows a typical error of ±55.6%, with 100% of held-out values landing inside the 95% band.
-89%Change by 2007
0.01Projected 2007 index
0.00–0.1795% range
±55.6%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2003 | 0.02 | 0.00 | 0.18 |
| 2004 | 0.02 | 0.00 | 0.18 |
| 2005 | 0.01 | 0.00 | 0.17 |
| 2006 | 0.01 | 0.00 | 0.17 |
| 2007 | 0.01 | 0.00 | 0.17 |
Vesper Sparrow Survey Routes in New Jersey
| Sandbrook | 2 | 1969 | 1969 |
| Six Points | 1 | 1978 | 1978 |
| Ancora | 1 | 1970 | 1968 |
| Masonville | 1 | 1967 | 1966 |
| Bennett Mill | 1 | 1972 | 1968 |
| New Bedford | 1 | 2002 | 1970 |
| Robbinsville | 1 | 1969 | 1968 |
| Bloomsbury | 1 | 1995 | 1969 |
| High Point | 1 | 2001 | 1988 |
| Pottersville | 1 | 1980 | 1980 |
| Roosevelt | 1 | 1994 | 1994 |
Vesper Sparrow Population Trend in Other States
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Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.