Gentoo Penguin
Pygoscelis papua
Attractive, medium-sized penguin that is rarely seen away from well-known colony sites. Appearance is distinctive with white “headphones” and a lipstick-orange bill unlike any other penguin. Striking head and bill pattern also make it one of the easiest penguins to identify when seen swimming at sea. Nests in small colonies and occurs around King and Magellanic Penguins in northern areas of its range, as on the Falklands.
识别特征
The gentoo penguin is easily recognised by the wide, white stripe extending like a bonnet across the top of its head and its bright orange-red bill. It has pale whitish-pink, webbed feet and a fairly long tail – the most prominent tail of all penguin species. Chicks have grey backs with white fronts. As the gentoo penguin waddles along on land, its tail sticks out behind, sweeping from side to side, hence the scientific name Pygoscelis, which means "rump-tailed".<p>Gentoo penguins can reach a length of 70 to 90 cm (28 to 35 in), making them the third-largest species of penguin after the emperor penguin and the king penguin. Males have a maximum weight around 8.5 kg (19 lb) just before moulting and a minimum weight of about 4.9 kg (11 lb) just before mating. For females, the maximum weight is 8.2 kg (18 lb) just before moulting, but their weight drops to as little as 4.5 kg (9.9 lb) when guarding the chicks in the nest. Birds from the north are on average 700 g (1.5 lb) heavier and 10 cm (3.9 in) longer than the southern birds. Southern gentoo penguins reach 75–80 cm (30–31 in) in length. They are the fastest underwater swimmers of all penguins, reaching speeds up to 36 km/h (22 mph). Gentoos are well adapted to extremely cold and harsh climates.
分类信息
The gentoo penguin is one of three species in the genus Pygoscelis. Mitochondrial and nuclear DNA evidence suggests the genus split from other penguins around 38 million years ago (Mya), about 2 million years after the ancestors of the genus Aptenodytes. In turn, the Adélie penguins split off from the other members of the genus around 19 Mya and the chinstrap and gentoo finally diverged around 14 Mya.<p>There are 4 subspecies recognized by the International Ornithological Congress:<p>Although the population on the Kerguelen Islands is tentatively included in taeniata, it may also be a distinct subspecies.<p>Before 2021, only two subspecies of the gentoo penguin have been recognised: P. p. papua (subantarctic gentoo) and the smaller P. p. ellsworthi (Antarctic gentoo). However, a 2020 study suggested that the gentoo penguin be split into a species complex of four morphologically similar but separate species: the northern gentoo penguin (P. papua sensu stricto), the southern gentoo penguin (P. ellsworthi), the eastern gentoo penguin (P. taeniata) and the newly described South Georgia gentoo penguin (P. poncetii). The International Ornithological Congress incorporated the results of this study in 2021, but relegated the newly recognized or newly described species to being subspecies of P. papua.
- 学名
- Pygoscelis papua
- 命名信息
- (Forster, JR, 1781)
- 目
- Sphenisciformes
- 科
- Spheniscidae
- 属
- Pygoscelis
分布与栖息地
- 迁徙
- Resident species
保护状况
The population of Pygoscelis papua in the maritime Antarctic is rapidly increasing. Due to regional climate changes, they colonise previously inaccessible territories southwards.As of 2019[update], the IUCN Red List lists the gentoo as least concerned with a stable population trend, although rapid declines in some key areas are believed to be driving a moderate overall decline in the species population. Examples include Bird Island, South Georgia, where the population has fallen by two-thirds over 25 years.[1] Many threats to this species, including pollution, hunting, fishing and human recreational activities continue to affect them.[30][31]
- 种群趋势
- stable
照片
分布
鸟叫声
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