Brown Teal
Anas chlorotis
Largest of the three endemic New Zealand teal species. Both sexes are primarily dark brown in color. Male in breeding plumage has green iridescence on head. Females and juveniles are a duller dark mottled brown. Both sexes show conspicuous white eye-ring around a dark brown eye. Mostly restricted to northern North Island (Northland, Great Barrier Island, and Coromandel Peninsula). Successfully bred in captivity for reintroduction efforts across the country in predator controlled areas. Crepuscular to nocturnal, favoring margins of small streams with overhanging vegetation and even stock ponds for feeding and breeding. Distinguished from similar looking Gray Teal and vagrant Chestnut Teal by lack of red eye, and lack of obvious white patches on the upperwing.
识别特征
There are no distinctive differences between a male, female and a juvenile brown teal during non-mating season. They all have a white ring around their eyes as well as a mottled brown color on their heads and throat. During breeding season the male will begin to change color, now having a green colored head, chestnut colored breast and a white stripe on each side of their body. They will sometimes also have a white clerical neck band. This does vary as some males do tend to be more colorful than others.
分类信息
Pateke is the progenitor of the flightless Auckland teal and Campbell teals but all are now recognised as separate species on account of their geographic isolation and their plumage, size and genetic distinctions. The insular A. aucklandica and A. nesiotis are recognised as distinct species, but are still sometimes referred to as being part of the "brown teal group". The use of the name 'pateke' is now common and is specific for this particular species.<p>Concerns have been raised about establishing genetically similar populations during re-introduction. The original captive pateke were sourced from Great Barrier Island, where only one haplotype was found in abundance, compared with eleven haplotypes found in the other remaining population at Mimiwhangata. The newly released flocks exclusively contain these birds of captive origin, and diversity is perhaps now not being fully represented in the National population.<p>The former population of Fiordland brown teal, which died out by 2013 has been replaced with captive-origin birds. Sequencing showed striking similarity to grey duck and mallard sequences, with which they group. It therefore seems extremely likely that the former Fiordland population of brown teal have at sometime in the past hybridised extensively with these invading species.
- 学名
- Anas chlorotis
- 命名信息
- Gray, GR, 1845
- 目
- Anseriformes
- 科
- Anatidae
- 属
- Anas
分布与栖息地
- 迁徙
- Resident species
行为
Migration pattern: Resident species.
保护状况
Population trend: rising.
- 种群趋势
- rising
照片
分布
鸟叫声
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