BirdAnalyst
Species · BCR 14 · BBS 2025 Release · 1966–2024

Common Merganser In Atlantic Northern Forest

All regionsAtlantic Northern ForestWaterfowl

Common Merganser in Atlantic Northern Forest has surged: up 168% on the route-weighted index since 1969.

+168%Since 1969
90Routes In Region
55Years

Notable Signals

long arc increasecomputed index

Common Merganser has surged in Atlantic Northern Forest: up 168% on the route-weighted index since 1969.

Forecast

If the recent trend holds, Common Merganser in Atlantic Northern Forest is projected to fall about 11% by 2029 — from 0.24 in 2024 to a central estimate of 0.21 (95% range 0.11–0.32). A 5-year backtest shows a typical error of ±23.7%, with 100% of held-out values landing inside the 95% band.

-11%Change by 2029
0.21Projected 2029 index
0.11–0.3295% range
±23.7%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
20250.200.100.31
20260.210.100.32
20270.210.100.32
20280.210.100.32
20290.210.110.32

Routes In Atlantic Northern Forest

Routes recording Common Merganser in Atlantic Northern Forest.
HudsonMAINE51995
GreenwoodMAINE42014
HarmonyMAINE42016
CastineMAINE41986
BaxterMAINE41984
WalpoleNEW-HAMPSHIRE42024
North RiverNEW-YORK42007
Bowdoin CtrMAINE32002
WinnMAINE32022
Ft FairfieldMAINE31994
MarlowNEW-HAMPSHIRE32021
GlenNEW-HAMPSHIRE32021
GaysvilleVERMONT32018
Wilson MillsMAINE22024
South ArmMAINE21994
NorthfieldMAINE21979
Moose RiverMAINE22005
CarrabassettMAINE22024
Seboomook LkMAINE22014
GreenvilleMAINE21997
Horse MtnMAINE22010
Jefferson HlNEW-HAMPSHIRE22022
StratfordNEW-HAMPSHIRE22019
SpeculatorNEW-YORK22023
GabrielsNEW-YORK22013

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