Mergini

The sea ducks (Mergini) are a tribe of the duck subfamily of birds, the Anatinae. The taxonomy of this group is incomplete. Some authorities separate the group as a subfamily, while others remove some genera. Most species within the group spend their winters near coastal waters. Many species have developed specialized salt glands to allow them to tolerate salt water, but these are poorly developed in juveniles. Some of the species prefer riverine habitats. All but two of the 22 species in this group live in far northern latitudes.

The fish-eating members of this group, such as the mergansers and smew, have serrated edges to their bills to help them grip their prey and are often known as "sawbills". Other sea ducks forage by diving underwater, taking molluscs or crustaceans from the sea floor. The Mergini take on the eclipse plumage during the late summer and molt into their breeding plumage during the winter.

Species

There are twenty-two species in ten genera:

Image	Genus	Living species
File:Clangula hyemalis Hokkaido25 (cropped).jpg	Clangula Template:Au	Long-tailed duck (formerly oldsquaw) (Clangula hyemalis)
File:Harlequin ducks (Histrionicus histrionicus) (13022042595).jpg	Histrionicus Template:Au	Harlequin duck (Histrionicus histrionicus)
File:Steller's Eider (Polysticta stelleri) (13667583535).jpg	Polysticta Template:Au	Steller's eider (Polysticta stelleri)
File:Somateria spectabilis 389138499.jpg	Somateria Template:Au	Spectacled eider (Somateria fischeri) Common eider (Somateria mollissima) King eider (Somateria spectabilis)
File:WWT Arundel (2552).jpg	Melanitta Template:Au	Common scoter (Melanitta nigra) Black scoter or American scoter (Melanitta americana) (sometimes considered a subspecies of M. nigra) Velvet scoter (Melanitta fusca) White-winged scoter (Melanitta deglandi) (sometimes considered a subspecies of M. fusca) Stejneger's scoter (Melanitta stejnegeri) Surf scoter (Melanitta perspicillata)
File:Common Goldeneye (Bucephala clangula) RWD2.jpg	Bucephala Template:Au	Common goldeneye (Bucephala clangula) Barrow's goldeneye (Bucephala islandica) Bufflehead (Bucephala albeola)
File:Mergellus albellus Oulu Finland 2020-05-08.jpg	Mergellus Template:Au	Smew (Mergellus albellus)
File:Hooded Merganser pair.JPG	Lophodytes Template:Au	Hooded merganser (Lophodytes cucullatus)
File:Scaly-sided Merganser RWD.jpg	Mergus Template:Au	Red-breasted merganser (Mergus serrator) †New Zealand merganser (Mergus australis) Common merganser or goosander (Mergus merganser) Brazilian merganser (Mergus octosetaceus) Scaly-sided merganser (Mergus squamatus)
File:Camptorhynchus labradorius (pair) -John James Audubon.jpg	†Camptorhynchus Template:Au	†Labrador duck (Camptorhynchus labradorius) (extinct)

Below is a phylogeny based on a mitogenomic study of the placement of the Labrador duck and the diving "goose" Chendytes lawi. Template:Clade

References

• SeaDucks.org - Science and Management Reference