Citizendia
Your Ad Here

Diving ducks
Red-crested Pochard
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Anseriformes
Family: Anatidae
Subfamily: Aythyinae
Genera

see article text

The 15 or so living species of diving duck, commonly called pochards or scaups, are part of the diverse and very large duck, goose, and swan family, Anatidae. The Red-crested Pochard ( Netta rufina) is a large Diving duck. Chordates ( Phylum Chordata) are a group of Animals that includes the Vertebrates together with several closely related Invertebrates Birds ( class Aves) are bipedal endothermic ( Warm-blooded) Vertebrate animals that lay eggs. The order Anseriformes contains about 150 living Species of Birds in three extant families the Anhimidae (the screamers Anseranatidae For duck as a food see Duck (food; for other meanings see Duck (disambiguation. Goose (plural geese) is the English name for a considerable number of Birds belonging to the family Anatidae. Swans are Birds of the family Anatidae, which also includes geese and Ducks Swans are grouped with the closely related geese in The latter article should be referred to for an overview of this very large family of birds. Birds ( class Aves) are bipedal endothermic ( Warm-blooded) Vertebrate animals that lay eggs.

The diving ducks here are placed in a distinct subfamily, Aythyinae. In Biological classification, family ( Latin While morphologically close to the dabbling ducks (Livezey, 1986), there are nonetheless some pronounced differences such as in the structure of the trachea. The term morphology in Biology refers to the outward appearance ( Shape, Structure, Colour, Pattern) of an Organism The Anatinae is a Subfamily of the family Anatidae ( Swans geese and Ducks. The traceartes, or windpipe, is a tube that has an inner diameter of about 20-25 mm and a length of about 10-16 cm in humans mtDNA cytochrome b and NADH dehydrogenase subunit 2 sequence data (Johnson & Sorenson, 1999) indicate that the dabbling and diving ducks are fairly distant from each other, the outward similarities being due to convergent evolution. Mitochondrial DNA ( mtDNA) is the DNA located in Organelles called mitochondria. Cytochrome b/b6 is main subunit of transmembrane cytochrome bc1 and b6f complexes NADH dehydrogenase ( is an Enzyme located in the inner mitochondrial membrane that catalyzes the transfer of Electrons from NADH to Coenzyme In Structural biology, a protein subunit or subunit protein is a single Protein Molecule that assembles (or " coassembles " A DNA sequence or genetic sequence is a succession of letters representing the Primary structure of a real or hypothetical DNA Molecule Convergent evolution describes the acquisition of the same biological trait in unrelated lineages

Alternatively (e. g. Terres, 1991), the diving ducks are placed as a tribe Aythyini in a subfamily Anatidae which would encompass all duck-like birds except the whistling-ducks. In Biology, a tribe &mdashor infrafamily&mdashis a Taxonomic rank between family and Genus. Dendrocygninae is a Subfamily of the Duck, Goose and Swan family of Birds Anatidae.

The seaducks commonly found in coastal areas, such as the Long-tailed Duck (formerly known in the US as Oldsquaw), scoters, goldeneyes and eiders, are also sometimes colloquially referred to in North America as diving ducks because they also feed by diving; their subfamily (Merginae) is a very distinct one however. The Long-tailed Duck ( Clangula hyemalis) is a medium-sized Sea duck. The scoters are stocky Seaducks in the Genus Melanitta. The drakes are mostly black and have swollen bills Goldeneye are small tree-hole nesting Northern hemisphere Seaducks belonging to the Genus Bucephala. For the river see Eider River. For other uses see Eider (disambiguation.

Although the group is cosmopolitan, most members are native to the northern hemisphere, and it includes several of the most familiar northern hemisphere ducks. In Biogeography, a Biological category of living things is said to have cosmopolitan distribution if this category can be found almost anywhere around the world Northern Hemisphere is the half of a Planet that is North of the Equator —the word hemisphere literally means 'half ball'

This group of ducks is so named because its members feed mainly by diving, although in fact the Netta species are reluctant to dive, and feed more like dabbling ducks.

These are gregarious ducks, mainly found on fresh water or on estuaries, though the Greater Scaup becomes marine during the northern winter. An estuary is a semi-enclosed Coastal body of Water with one or more Rivers or Streams flowing into it and with a free connection to the open The Greater Scaup ( Aythya marila) just Scaup in Europe, or colloquially known as "Bluebill" is a small Diving duck. They are strong fliers; their broad, blunt-tipped wings require faster wing-beats than those of many ducks and they take off with some difficulty. Northern species tend to be migratory; southern species do not migrate though the Hardhead travels long distances on an irregular basis in response to rainfall. Bird migration refers to the regular seasonal journeys undertaken by many species of Birds Bird movements include those made in response to changes in food availability For the fictional characters in the Transformers series see Hardhead (Transformers. Diving ducks do not walk as well on land as the dabbling ducks; their legs tend to be placed further back on their bodies to help propel them when underwater. The Anatinae is a Subfamily of the family Anatidae ( Swans geese and Ducks.

Systematics

Here, three genera are included in the Aythyini. A genus (plural genera from Γένος Latin genus "descent family type gender" is a low-level Taxonomic The Marbled Duck which makes up the monotypic genus Marmaronetta, however, seems very distinct and might have diverged prior to the split of dabbling and diving ducks as indicated by morphological (Livezey, 1986) and molecular characteristics (Johnson & Sorenson, 1999). The Marbled Duck, or Marbled Teal ( Marmaronetta angustirostris) is a medium-sized Duck. Monotypic is an adjective that refers to a taxonomic group with only one type: In Botany, "monotypic" means that a Taxon has only The probably extinct Pink-headed Duck, previously treated separately in Rhodonessa, has been suggested to belong into Netta (Livezey, 1998 contra Livezey, 1986), but this approach has been questioned (Collar et al. The Pink-headed Duck ( Netta caryophyllacea) is (or was a large Diving duck. , 2001). DNA sequence analyses, which would probably resolve this question, have not been conducted to date for lack of suitable material. A DNA sequence or genetic sequence is a succession of letters representing the Primary structure of a real or hypothetical DNA Molecule It might be an early divergence from the dabbling duck lineage (Livezey, 1986). The molecular analysis of Johnson & Sorenson (1999) also suggests that the White-winged Wood Duck should be placed into a monotypic genus Asarcornis which is fairly close to Aythya and might belong into this subfamily. The White-winged Wood Duck, Cairina scutulata is a species of Duck, usually placed in the Genus Cairina and allied with the Monotypic is an adjective that refers to a taxonomic group with only one type: In Botany, "monotypic" means that a Taxon has only

FAMILY ANATIDAE

References

Dictionary

diving duck

-noun

  1. A duck that feeds mainly by diving such as the pochard.
© 2009 citizendia.org; parts available under the terms of GNU Free Documentation License, from http://en.wikipedia.org
 Dapyx Software network: MP3 Explorer | Ebook Manager | Zenithic