Mergus is the genus of the typical mergansers, fish-eating ducks in the subfamily Anatinae. The genus name is a Latin word used by Pliny the Elder and other Roman authors to refer to an unspecified waterbird.
|Red-breasted merganser (Mergus serrator)|
The common merganser (Mergus merganser) and red-breasted merganser (M. serrator) have broad ranges in the northern hemisphere. The Brazilian merganser (M. octosetaceus) is a South American duck, and one of the six most threatened waterfowl in the world, with possibly fewer than 250 birds in the wild. The scaly-sided merganser or "Chinese merganser" (M. squamatus) is an endangered species. It lives in temperate East Asia, breeding in the north and wintering in the south.
The hooded merganser (Lophodytes cucullatus, formerly known as Mergus cucullatus) is not of this genus but is closely related. The other "aberrant" merganser, the smew (Mergellus albellus), is phylogenetically closer to goldeneyes (Bucephala).
Although they are seaducks, most of the mergansers prefer riverine habitats, with only the red-breasted merganser being common at sea. These large fish-eaters typically have black-and-white, brown and/or green hues in their plumage, and most have somewhat shaggy crests. All have serrated edges to their long and thin bills that help them grip their prey. Along with the smew and hooded merganser, they are therefore often known as "sawbills". The goldeneyes, on the other hand, feed mainly on mollusks, and therefore have a more typical duck-bill.
Mergus ducks are also classified as "diving ducks" because they submerge completely in looking for food. In other traits, however, the genera Mergus, Lophodytes, Mergellus, and Bucephala are very similar: uniquely among all Anseriformes, they do not have notches at the hind margin of their sternum, but holes surrounded by bone.
|Image||Scientific name||Common name||Distribution|
|Mergus merganser||Common merganser or goosander||Europe, northern and central Asia, and North America|
|Mergus octosetaceus||Brazilian merganser||Brazil|
|Mergus serrator||Red-breasted merganser||Northern North America, Greenland, Europe, and Asia.|
|Mergus squamatus||Scaly-sided merganser||East Asia|
- New Zealand merganser, Mergus australis (extinct c.1902)
- Chatham Island merganser, Mergus milleneri, is known from Holocene remains from the Chatham Island (may have survived to historical times).
- Mergus miscellus is known from the Middle Miocene Calvert Formation (Barstovian, c.14 million years ago) of Virginia, USA.
- Mergus connectens lived in the Early Pleistocene about 2–1 million years ago, in Central and Eastern Europe.
The Early Oligocene booby "Sula" ronzoni was at first mistakenly believed to be a typical merganser. A Late Serravallian (13–12 million years ago) fossil sometimes attributed to Mergus, found in the Sajóvölgyi Formation of Mátraszőlős, Hungary, probably belongs to Mergellus. The affiliations of the mysterious "Anas" albae from the Messinian (c. 7–5 million years ago) of Hungary are undetermined; it was initially believed to be a typical merganser too.
- Jobling, James A (2010). The Helm Dictionary of Scientific Bird Names. London: Christopher Helm. p. 251. ISBN 978-1-4081-2501-4.
- Etymology: Latin mergus, a catch-all term for sea-going birds: Arnott, W.G. (1964). "Notes on Gavia and Mergvs in Latin Authors". Classical Quarterly. New Series. 14 (2): 249–262. doi:10.1017/S0009838800023806. JSTOR 637729.
- "Common Goldeneye". Seattle Audubon Society. Retrieved 18 April 2014.
- Livezey, Bradley C. (1986). "A phylogenetic analysis of recent anseriform genera using morphological characters" (PDF). Auk. 103 (4): 737–754.
- Mlíkovský, Jirí (2002a). "Early Pleistocene birds of Stránská skála, Czech Republic: 2. Absolon's cave" (PDF). Sylvia. 38: 19–28. Archived from the original (PDF) on 2016-04-11. Retrieved 2008-08-05.
- Mlíkovský (2002b): p. 264
- Gál, Erika; Hír, János; Kessler, Eugén & Kókay, József (1998–99). "Középsõ-miocén õsmaradványok, a Mátraszõlõs, Rákóczi-kápolna alatti útbevágásból. I. A Mátraszõlõs 1. lelõhely [Middle Miocene fossils from the sections at the Rákóczi chapel at Mátraszőlős. Locality Mátraszõlõs I.]" (PDF). Folia Historico Naturalia Musei Matraensis (in Hungarian and English). 23: 33–78. Archived from the original (PDF) on 2011-07-21. Retrieved 2007-02-06.
- Mlíkovský (2002b): p. 124
|Wikimedia Commons has media related to Mergus.|
- Mlíkovský, Jirí (2002b): Cenozoic Birds of the World, Part 1: Europe. Ninox Press, Prague.