The population size and trends for mergansers are not reliably known, as many of the aerial surveys used to monitor the birds do not distinguish between the three species, whose breeding ranges overlap extensively. An important part of the merganser breeding range in the boreal forest is not covered by the surveys. However, the three species can be reliably identified during helicopter-based plot surveys conducted as part of the Eastern Waterfowl Breeding Ground Survey The Hooded Merganser is also monitored by the Waterfowl Breeding Population Survey of the Central Interior Plateau of British Columbia and the Southern Ontario Waterfowl Plot Survey. The Hooded Merganser is currently experiencing increasing or stable long-term trends in all surveyed areas; and it is at an acceptable level relative to its national population goal. Detailed information on the population status of waterfowl species is available in the Population Status of Migratory Game Birds in Canada report (summarized version). To obtain a copy of the full version of this report, including tables and graphs, please contact ec.scf-oismiggibiers-cws-miggamebirds.ec@canada.ca.
Additional information on: British Columbia Coastal Waterbird Survey
Additional information on: Eastern waterfowl breeding ground survey
Additional information on: Southern Ontario Waterfowl Plot Survey
Additional information on: Waterfowl Breeding Population Survey of the Central Interior Plateau of B.C.
