BirdAnalyst
Species · BCR 27 · BBS 2025 Release · 1966–2024

American Black Duck In Southeastern Coastal Plain

All regionsSoutheastern Coastal PlainWaterfowl

American Black Duck in Southeastern Coastal Plain has collapsed: down 85% on the route-weighted index since 1975.

-85%Since 1975TrendPercent 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 →
4Routes 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 →
16YearsYears 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 declinecomputed 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 →

American Black Duck has collapsed in Southeastern Coastal Plain: down 85% on the route-weighted index since 1975.

Routes In Southeastern Coastal Plain

Routes recording American Black Duck in Southeastern Coastal Plain.
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 →
MerrimonNORTH-CAROLINA52001
Milltail CrNORTH-CAROLINA42007
BranchvilleVIRGINIA31996
SpeedNORTH-CAROLINA22017

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