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Difference between revisions of "Emperor penguin"
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==Distribution and habitat== | ==Distribution and habitat== | ||
[[File:Empereur ranges.png|thumb|right|Emperor penguin range. Breeding areas in green]] | [[File:Empereur ranges.png|thumb|right|Emperor penguin range. Breeding areas in green]] | ||
The emperor penguin has a circumpolar distribution in the [[Antarctica|Antarctic]] almost exclusively between the 66° and 77° south latitudes. It almost always breeds on stable [[pack ice]] near the coast and up to 18 km (11 mi) offshore. Breeding colonies are usually located in areas where ice cliffs and [[iceberg]]s shelter them from the wind. Three land colonies have been reported: one (now disappeared) on a shingle spit at the Dion Islands on the [[Antarctic Peninsula]], one on a headland at Taylor Glacier in Victoria Land, and most recently one at Amundsen Bay. Since 2009, a number of colonies have been reported on [[ice-shelf|shelf ice]] rather than sea ice, in some cases moving to the shelf in years when sea ice forms late. | The emperor penguin has a circumpolar distribution in the [[Antarctica|Antarctic]] almost exclusively between the 66° and 77° south latitudes. It almost always breeds on stable [[pack ice]] near the coast and up to 18 km (11 mi) offshore. Breeding colonies are usually located in areas where ice cliffs and [[iceberg]]s shelter them from the wind. Three land colonies have been reported: one (now disappeared) on a shingle spit at the [[Dion Islands]] on the [[Antarctic Peninsula]], one on a headland at [[Taylor Glacier]] in [[Victoria Land]], and most recently one at [[Amundsen Bay]]. Since 2009, a number of colonies have been reported on [[ice-shelf|shelf ice]] rather than sea ice, in some cases moving to the shelf in years when sea ice forms late. | ||
The northernmost breeding population is on Snow Island, near the northern tip of the Peninsula. | The northernmost breeding population is on [[Snow Island]], near the northern tip of the Arctic Peninsula. | ||
The total population was estimated in 2009 to be at around 595,000 adult birds, in 46 known colonies spread around the Antarctic and sub-Antarctic; around 35% of the known population lives north of the [[Antarctic Circle]]. Colonies are known to fluctuate over time, often breaking into "suburbs" which move apart from the parent group, and some have been known to disappear entirely. The Cape Crozier colony on the Ross Sea dropped drastically in size between the first visits by the Discovery Expedition in 1902–03 and the later visits by the Terra Nova Expedition in 1910–11; it was reduced to a few hundred birds, and may have come close to extinction due to changes in the position of the ice shelf. By the 1960s it had rebounded dramatically, but by 2009 was again reduced to a small population of around 300. | The total population was estimated in 2009 to be at around 595,000 adult birds, in 46 known colonies spread around the Antarctic and sub-Antarctic; around 35% of the known population lives north of the [[Antarctic Circle]]. Colonies are known to fluctuate over time, often breaking into "suburbs" which move apart from the parent group, and some have been known to disappear entirely. The Cape Crozier colony on the Ross Sea dropped drastically in size between the first visits by the Discovery Expedition in 1902–03 and the later visits by the Terra Nova Expedition in 1910–11; it was reduced to a few hundred birds, and may have come close to extinction due to changes in the position of the ice shelf. By the 1960s it had rebounded dramatically, but by 2009 was again reduced to a small population of around 300. | ||