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Species · Louisiana · BBS 2025 Release · 1966–2024

Seaside Sparrow Population Trend in Louisiana

All statesGeneralists

Seaside Sparrow in Louisiana has surged: up 19× on the route-weighted index since 1973.

19×Since 1973TrendPercent 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 →
7Routes 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 →
30YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Seaside Sparrow Trends in LouisianaNotable 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 increasecomputed 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 →

Seaside Sparrow has surged in Louisiana: up 19× on the route-weighted index since 1973.

Seaside Sparrow Population Forecast in Louisiana

If the recent trend holds, Seaside Sparrow in Louisiana is projected to stay roughly flat through 2026, near 1.8 (95% range 0.05–3.5). A 5-year backtest shows a typical error of ±1037.6%, with 60% of held-out values landing inside the 95% band.

n/aChange by 2026TrendPercent 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 →
1.8Projected 2026 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.05–3.595% 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 →
±1037.6%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, Seaside Sparrow in Louisiana is projected to stay roughly flat through 2026, near 1.8 (95% range 0.05–3.5). A 5-year backtest shows a typical error of ±1037.6%, with 60% of held-out values landing inside the 95% band.19672026
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 →
20221.60.003.4
20231.70.003.4
20241.70.003.4
20251.70.013.5
20261.80.053.5

Seaside Sparrow Survey Routes in Louisiana

Routes recording Seaside Sparrow in Louisiana.
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 →
Grand Isle11720192010
Forked Island 21420112010
Hackberry220161992
Creole119731967
Ltl Chenier120211988
Sabine Nwr120021989
Glencoe119971997

Seaside Sparrow Population Trend in Other States

alabamadelawarefloridamarylandmassachusettsnew-jerseynew-yorknorth-carolinasouth-carolinatexasvirginia

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