BirdAnalyst
Species · BCR 31 · BBS 2025 Release · 1966–2024

Double-crested Cormorant In Peninsular Florida

All regionsPeninsular FloridaWetland birds

Double-crested Cormorant in Peninsular Florida has collapsed: down 95% on the route-weighted index since 1968.

-95%Since 1968
70Routes In Region
58Years

Notable Signals

long arc declinecomputed index

Double-crested Cormorant has collapsed in Peninsular Florida: down 95% on the route-weighted index since 1968.

Forecast

If the recent trend holds, Double-crested Cormorant in Peninsular Florida is projected to fall about 100% by 2029 — from 0.29 in 2024 to a central estimate of 0.00 (95% range 0.00–4.1). A 5-year backtest shows a typical error of ±99.7%, with 100% of held-out values landing inside the 95% band.

-100%Change by 2029
0.00Projected 2029 index
0.00–4.195% range
±99.7%Backtest error
19662029
Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.
YearProjected index95% low95% high
20250.000.004.1
20260.000.004.1
20270.000.004.1
20280.000.004.1
20290.000.004.1

Routes In Peninsular Florida

Routes recording Double-crested Cormorant in Peninsular Florida.
Plantation KFLORIDA802004
ShawanoFLORIDA702002
Key WestFLORIDA291987
Sugarloaf KeyFLORIDA272004
Merritt IslFLORIDA132011
Merritt Island 2FLORIDA132014
Ridge HarborFLORIDA112015
ScottsmoorFLORIDA72024
AndytownFLORIDA71998
St AugustineFLORIDA62014
Pennywash CrFLORIDA62017
Key LargoFLORIDA61991
Sandy 2FLORIDA52016
Shawano 2FLORIDA52011
Dale MabryFLORIDA41986
Myakka HeadFLORIDA42011
TamiamiFLORIDA41971
Lake BuffumFLORIDA42014
SebastianFLORIDA31991
Citrus ParkFLORIDA32017
CrewsvilleFLORIDA32016
Vero BeachFLORIDA32022
MabelFLORIDA22007
ChildsFLORIDA22016
Sunniland GrFLORIDA22001

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