| 词条 | African black duck |
| 释义 |
| name = African black duck | image = African Black Duck.jpg | status = LC | status_system = IUCN3.1 | status_ref = [1] | taxon = Anas sparsa | authority = Eyton, 1838 | subdivision_ranks = Subspecies | subdivision =
}} The African black duck (Anas sparsa) is a species of duck of the genus Anas. It is genetically closest to the mallard group, but shows some peculiarities in its behavior[3] and (as far as they can be discerned) plumage; it is accordingly placed in the subgenus Melananas pending further research. DescriptionThe African black duck is a black duck with pronounced white marks on its back, a dark bill, and orange legs and feet. A purpish-blue speculum is often visible, especially in flight. It lives in central and southern Africa. It is also known as the black river duck, or (A. s. leucostigma) West African black duck or Ethiopian black duck. It is a medium-sized duck, length 48–57 cm, with the male the larger.[3] DistributionThe African black duck is mainly found in eastern and southern sub-Saharan Africa from South Africa n north to South Sudan and Ethiopia with outlying populations in western equatorial Africa, in south east Nigeria, Cameroon and Gabon.[2] Behavior and reproductionIt is a very shy and territorial duck. It is usually seen in pairs or small flocks. It breeds throughout the year in different areas. Incubation is about 30 days by the mother and the fledgling period is 86 days and only the mother takes care of the young. Their egg quantity ranges from 4 to 8 eggs.[3] EcologyThough it likes to stay in rivers and streams during the day it prefers large open waters during the night. This duck likes water in the wooded hills of Africa and hides its nest near running water. Also the African black duck makes its cup shaped nest of driftwood and matted grass. Though it builds its nest near water it is always above flood level and on the ground.[3] DietIt is an omnivore that feeds off of larvae and pupae usually found under rocks, aquatic animals, plant material, seeds, small fish, snails, and crabs.[3] References1. ^{{IUCN|id=22680170 |title=Anas sparsa |assessor=BirdLife International |assessor-link=BirdLife International |version=2013.2 |year=2012 |accessdate=26 November 2013}} [4]2. ^{{cite web | url = http://www.hbw.com/species/african-black-duck-anas-sparsa | title = African Black Duck (Anas sparsa) | accessdate = 2016-11-06 | publisher = Lunx Edicions|work = Handbook of the Birds of the World Alive}} 3. ^1 2 {{cite web | url = http://www.biodiversityexplorer.org/birds/anatidae/anas_sparsa.htm | title = Anas sparsa (African black duck) | accessdate = 2016-11-06 | publisher = Iziko Museums of South Africa|work = Biodiversity Explorer}} 4. ^1 2 {{cite journal|author=Johnson, Kevin P. |author2=McKinney, Frank |author3=Wilson, Robert |author4=Sorenson, Michael D. |last-author-amp=yes |year=2000 |title=The evolution of postcopulatory displays in dabbling ducks (Anatini): a phylogenetic perspective |journal=Animal Behaviour |volume=59 |issue=5 |pages=953–963 |url=http://ducksrus.bu.edu/~msoren/pubs/AnimBehav2000b.pdf |doi=10.1006/anbe.1999.1399 |pmid=10860522 |deadurl=yes |archiveurl=https://web.archive.org/web/20060105021653/http://ducksrus.bu.edu/~msoren/pubs/AnimBehav2000b.pdf |archivedate=2006-01-05 }} }} External links
5 : Anas|Ducks|Birds of Africa|Birds of Sub-Saharan Africa|Birds described in 1838 |
| 随便看 |
|
开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。