BirdAnalyst
Species · BCR 36 · BBS 2026 Release · 1966–2025

Summer Tanager In Tamaulipan Brushlands

All regionsTamaulipan BrushlandsForest birds

Summer Tanager in Tamaulipan Brushlands has risen sharply: up 53% on the route-weighted index since 1970.

+53%Since 1970TrendPercent 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 →
16Routes In RegionSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
39YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable SignalsNotable 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 →

Summer Tanager has risen sharply in Tamaulipan Brushlands: up 53% on the route-weighted index since 1970.

Summer Tanager In Tamaulipan Brushlands Population Forecast

If the recent trend holds, Summer Tanager in Tamaulipan Brushlands is projected to fall about 60% by 2030 — from 0.55 in 2025 to a central estimate of 0.22 (95% range 0.00–0.51). A 5-year backtest shows a typical error of ±107.9%, with 80% of held-out values landing inside the 95% band.

-60%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 →
0.22Projected 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 →
0.00–0.5195% 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 →
±107.9%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, Summer Tanager in Tamaulipan Brushlands is projected to fall about 60% by 2030 — from 0.55 in 2025 to a central estimate of 0.22 (95% range 0.00–0.51). A 5-year backtest shows a typical error of ±107.9%, with 80% of held-out values landing inside the 95% band.19672030
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 →
20260.220.000.50
20270.220.000.50
20280.220.000.50
20290.220.000.50
20300.220.000.51

Routes In Tamaulipan Brushlands

Routes recording Summer Tanager in Tamaulipan Brushlands.
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 →
HondoTEXAS52025
KingsvilleTEXAS31985
Agua NuevaTEXAS21973
RandadoTEXAS21994
El IndioTEXAS21997
ProgresoTEXAS21996
SejitaTEXAS22011
MillettTEXAS21996
RachalTEXAS12013
George WestTEXAS12025
La PryorTEXAS12017
RaymondvilleTEXAS12024
El SauzTEXAS12012
Catarina 3TEXAS12023
Pedro CreekTEXAS12005
Millett 2TEXAS12021

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