Penguin/Catalogs/Penguins in the northern hemisphere: Difference between revisions
imported>John Stephenson (Several new sections and reorganisation; equatorial penguins; penguins floating north on ice floes, etc.; new image) |
imported>John Stephenson m (Penguins in the Arctic Circle moved to Penguins in the northern hemisphere: The article no longer concerns penguins in the Arctic; rather, penguins in the northern hemisphere generally are discussed.) |
Revision as of 21:15, 25 May 2007
The assumption that all wild penguins live in the Earth's southern hemisphere, mainly in Antarctica, is inaccurate; in fact, there are probably hundreds of these flightless birds at large in northern waters. This is not only because there are penguin colonies on islands crossing the equator, but also due to at least two attempts to introduce penguins to the Arctic Circle.
Equatorial penguins
Although most penguins' natural habitat lies well within the southern hemisphere, many do live further north. The Galápagos penguin is the only equatorial species, living mainly colonies of several hundred birds on two of the Galápagos Islands west of Ecuador in South America. Because the northernmost point of Fernandina Island lies just inside the northern hemisphere, it is possible for these penguins to make regular incursions into the north.
Penguins in the Arctic Circle
The possibility of penguins in the Arctic Circle living for some time cannot be conclusively ruled out, as there have been at least two attempts to introduce them to the northern hemisphere.
The Arctic: a habitat unfit for penguins
Penguins have certainly not themselves made the Arctic their home; the Earth's poles are probably too far apart for these animals to make the journey. Penguin experts would not recommend introducing a penguin colony towards the North Pole as they would could count as an invasive species, possibly disrupting the ecosystem and disturbing the food chain; this could threaten other wildlife. Alternatively, penguins would be unable to compete successfully with local species, meaning they would succumb to starvation, disease or predation.
Penguins artificially introduced to the Arctic
Despite fears that penguins would not survive in Arctic conditions, groups of these animals have been introduced to the north. In the nineteenth century, the great auk was hunted to extinction by whalers; 1930s scientists speculated that penguins could fill this ecological niche, providing a source of meat and eggs.[1] In 1936, a team from the Norwegian Nature Protection Society led by Carl Schoyen released nine king penguins in northern Norway. In 1938, a separate group released several macaroni and jackass penguins into the same region. For most individual penguins, the trail then went cold; one was certainly killed by a local huntswoman who apparently mistook it for a demon, and another was caught on a fishing line as late as 1944, apparently in good health. No others were conclusively sighted.[2]
Captive penguins in the northern hemisphere
No further attempts to introduce penguins to the Arctic Circle are on record; any penguins north of the equator are confined to zoos, with some also acting as mascots for various organisations.[3][4] However, the myth of the 'Arctic penguin' persists on the internet,[5] possibly encouraged by various factors, from casual birdwatchers mistaking auks for penguins, to Christmas cards featuring penguins alongside northern polar bears.[6]
Penguins of the southern hemisphere found further north than usual
Occasionally, other species are spotted much further north than their natural grounds, though still inside the southern hemisphere. As these animals make good swimmers, it is possible for them to journey considerable differences, as one magellanic penguin from southern Chile proved, the bird travelling 3000 miles (5000 kilometres) to end up in Peru.[7] Larger groups of Antarctic species also regularly wash up on the coastline of Brazil every year, having floated thousands of miles on melting ice floes. While this phenomenon has kept Brazilian zoos well-supplied with penguins, more recently the Brazilian government has arranged for hundreds of the birds to be repatriated to Antarctica with the help of the air force and navy.[8]
Footnotes
- ↑ Modern science has also noted the similarities between the unrelated species of penguins and auks as an example of convergent evolution; see Van Tuinen et al. (2001: 1349-1350).
- ↑ New Scientist: 'Job swap.' 20th August 2005.
- ↑ For example, a king penguin from Edinburgh Zoo has been made an honorary regimental sergeant major in the Norwegian Army. See BBC News: 'Penguin picks up military honour'.
- ↑ Linus Torvalds, the creator of the Linux operating system, is from the northern hemisphere nation of Finland, and is also fond of penguins, to the extent that a cartoon version has become the official Linux mascot. Perhaps this tenuous association between penguins and Finnish people has also encouraged the myth of the 'Arctic penguin'.
- ↑ Superspoof.com: Save the Arctic Penguin Campaign'.
- ↑ There is also a Scottish cruise ship, the Arctic Penguin; how much this name has misled tourists is unknown.
- ↑ BBC News: Confused penguin strays 5,000km.' 11th May 2007.
- ↑ BBC News: Brazil to take penguins back home.' 31st July 2006.
Reference
- Van Tuinen M, Butvill DB, Kirsch JAW & Hedges SB (2001) 'Convergence and divergence in the evolution of aquatic birds'. Proceedings of the Royal Society B 268: 1345-1350.