The king penguin (Aptenodytes patagonicus) is a large species of penguin, second only to the emperor penguin in size. There are two subspecies: A. p. patagonicus and A. p. halli; patagonicus is found in the South Atlantic and halli elsewhere.
King penguins eat small fish, mainly lanternfish, and squid. They are less reliant on krill and other crustaceans than most Southern Ocean predators. On foraging trips king penguins repeatedly dive to over 100 metres (300Â ft), and have been recorded at depths greater than 300 metres (1,000Â ft).
King penguins breed on the subantarctic islands at the northern reaches of Antarctica, South Georgia, and other temperate islands of the region.
Description
The king penguin stands at 70 to 100Â cm (28 to 39Â in) tall and weighs from 9.3 to 18Â kg (21 to 40Â lb). Males are slightly larger than females. The mean body mass of adults from Marion Island was 12.4Â kg (27Â lb) for 70 males and 11.1Â kg (24Â lb) for 71 females. Another study from Marion Island found that the mean mass of 33 adults feeding chicks was 13.1Â kg (29Â lb). Thus the average weight of the king penguin is similar or just slightly higher than that of the largest living flying birds. The plumage of the king penguin is broadly similar to that of the closely related emperor penguin, with a broad cheek patch contrasting with surrounding dark feathers and yellow-orange color at the top of the chest, however the cheek patch of the adult king penguin is bright orange whereas that of the emperor penguins is white, while the chest orange tends to be more vivid and less yellowish in the king species. Both species have colorful markings along the side of their lower mandible, but these are pinkish in emperor penguins and orange in king penguins. Emperor and king penguins do not occur together in the wild typically, with the possible exception of vagrants at sea, but the emperor can readily be distinguished by being noticeably larger and bulkier. Once fully molted of its heavy dark brown down, the juvenile king penguin resembles the adult but is somewhat less colorful. King penguins often breed on the same large, circumpolar islands as at least half of all living penguins, but it is easily distinguished from co-occurring penguins by its much larger size and taller frame, distinctive markings and grizzled sooty-grayish rather than blackish back.
Distribution and habitat
King penguins breed on subantarctic islands between 45 and 55°S, at the northern reaches of Antarctica, as well as Tierra del Fuego, the Falkland Islands, and other temperate islands of the region. The total population is estimated to be 2.23 million pairs and is increasing. The largest breeding populations are on the Crozet Islands, with around 455,000 pairs, 228,000 pairs on the Prince Edward Islands, 240,000â€"280,000 on the Kerguelen Islands and over 100,000 in the South Georgia archipelago. Macquarie Island has around 70,000 pairs. The non-breeding range is poorly known due to vagrant birds having been recorded from the Antarctic peninsula as well as South Africa, Australia and New Zealand.
The Nature Protection Society released king penguins in Gjesvær in Finnmark, and Røst in Lofoten in northern Norway in August 1936. Birds were reported in the area several times in the 1940s though none have been seen since 1949.
Behavior
American zoologist Gerry Kooyman revolutionized the study of penguin foraging behaviour in 1971 when he published his results from attaching automatic dive-recording devices to emperor penguins, and recording a dive of 235 metres (771 ft) by a king penguin in 1982. The current maximum dive recorded is 343 metres in the Falkland Islands region, and a maximum time submerged of 552 seconds recorded at the Crozet Islands. The king penguin dives to depths of 100â€"300 meters (350â€"1000 feet), spending around five minutes submerged, during daylight hours, and less than 30 metres (98 ft) at night.
The majority (around 88% in one study) of dives undertaken by king penguins are flat-bottomed; that is, the penguin dives to a certain depth and remains there for a period of time hunting (roughly 50% of total dive time) before returning to the surface. They have been described as U-shaped or W-shaped, relating to the course of the dive. The bird dives in a V-shaped or "spike" pattern in the remaining 12% of dives; that is the bird dives at an angle through the water column, reaches a certain depth and then returns to the surface. Other penguins dive in this latter foraging pattern in contrast. Observations at Crozet Islands revealed most king penguins were seen within 30Â km (19Â mi) of the colony. Using the average swimming speed, Kooyman estimated the distance travelled to foraging areas at 28Â km (17Â mi).
Its average swimming speed is 6.5â€"10 km/h (4â€"6 mph). On shallower dives under 60 m (200 ft), it averages 2 km/h (1.2 mph) descending and ascending, while on deeper dives over 150 m (490 ft) deep, it averages 5 km/h (3.1 mph) in both directions. King penguins also porpoise, a swimming technique used to breathe while maintaining speed. On land, the king penguin alternates between walking with a wobbling gait and tobogganingâ€"sliding over the ice on its belly, propelled by its feet and wing-like flippers. Like all penguins, it is flightless.
Diet
King penguins eat small fish and squid and rely less than most Southern Ocean predators on krill and other crustaceans. Fish constitute 80â€"100% of their diet, except in winter months of July and August, when they make up only 30%. Lanternfish are the main fish taken, principally the species Electrona carlsbergi and Krefftichthys anderssoni, as well as Protomyctophum tenisoni. Slender escolar (Paradiplospinus gracilis) of the Gempylidae, and Champsocephalus gunneri, is also consumed. Cephalopods consumed include those of the genus Moroteuthis, the hooked squid or Kondakovia longimana, the sevenstar flying squid (Martialia hyadesii), young Gonatus antarcticus and Onychoteuthis species.
Predators
The king penguin's predators include birds and aquatic mammals:
- Giant petrels take several chicks of various sizes and some eggs, in rare cases they've been reported to kill adult king penguins, but probably largely infirm ones. However, these large seabirds possibly devour more young king penguins after they've already died from other causes.
- Skua species (Stercorarius spp.) take small chicks and eggs. Some writings may overemphasize the effect skua predation have on king penguin colonies, but large numbers are taken in areas where skua nest close to penguin colonies.
- The snowy sheathbill (Chionis alba) and kelp gull (Larus dominicanus) scavenge for dead chicks and unattended eggs.
- The leopard seal (Hydrurga leptonyx) takes adult birds at sea.
- Orcas may also hunt king penguins.
- Antarctic fur seals on Marion Island have also been seen chasing king penguins on the beach, killing and eating them. It seems that especially males, and particularly sub-adults males, are involved.
Courtship and breeding
The king penguin is able to breed at three years of age, although only a very small minority (5% recorded at Crozet Islands) actually do then; the average age of first breeding is around 6 years. King penguins are serially monogamous. They have only one mate each year, and stay faithful to that mate. However, fidelity between years is only about 29%. The long breeding cycle may contribute to this low rate.
The king penguin has an unusually prolonged breeding cycle, taking some 14â€"16 months from laying to offspring fledging. Although pairs will attempt to breed annually, they are generally only successful one year in two, or two years in three in a triennial pattern on South Georgia. The reproductive cycle begins in September to November, as birds return to colonies for a prenuptial moult. Those that were unsuccessful in breeding the previous season will often arrive earlier. They then return to the sea for three weeks before coming ashore in November or December. The female penguin lays one pyriform (pear-shaped) white egg weighing 300 g (â…" lb). It is initially soft, but hardens and darkens to a pale greenish colour. It measures around 10 cm × 7 cm (3.9 in × 2.8 in). The egg is incubated for around 55 days with both birds sharing incubation in shifts of 6â€"18 days each. Hatching may take up to 2â€"3 days to complete, and chicks are born semi-altricial and nidicolous. In other words, they have only a thin covering of down and are entirely dependent on their parents for food and warmth. The guard phase starts with the birth of the chick. The young chick spends its time balanced on its parents' feet, sheltered by a pouch formed from the abdominal skin of the latter. During this time, the parents alternate every 3â€"7 days, one guarding the chick while the other forages. The guard phase lasts for 30â€"40 days. By then the chick has grown much bigger, can keep itself warm and protect itself against most predators. It becomes more curious and starts to explore its surroundings. It ends up forming a group with other chicks, a so-called crèche. Crèches are guarded by only a few adult birds; most parents can leave their chick to forage for themselves and their chick. Other species of penguins also practice this method of communal care for offspring.
By April the chicks are almost fully grown, but lose weight by fasting over the winter months, gaining it again during spring in September. Fledging then takes place in late spring/early summer.
King penguins form huge breeding colonies; for example, the colony on South Georgia Island at Salisbury Plain holds over 100,000 breeding pairs and the one at St. Andrew's Bay over 100,000 birds. Because of the long breeding cycle, colonies are continuously occupied.
The king penguin feeds its chicks by eating fish, digesting it slightly and vomiting the food into the chick's mouth.
Because of their large size, king penguin chicks take 14â€"16 months before they are ready to go to sea. This is markedly different from smaller penguins, who rear their chicks through a single summer when food is plentiful. King penguins time their mating so the chicks will develop over the harshest season for fishing. In this way, by the time the young penguins are finally mature enough to leave their parents, it is summer when food is plentiful and conditions are more favorable for the young to survive alone.
Relationship with humans
Considered a flagship species, 176 individuals were counted in captivity in North American zoos and aquaria in 1999. The species has been bred in captivity at SeaWorld San Diego. The species is exhibited at SeaWorld Orlando, Indianapolis Zoo, Detroit Zoo, Saint Louis Zoo, Kansas City Zoo, Newport Aquarium in Newport, Kentucky, Edinburgh Zoo in Scotland, Berlin Zoological Garden in Germany, Zurich Zoo, in the Netherlands Diergaarde Blijdorp, in Switzerland, 63 Seaworld in Seoul, South Korea, Melbourne Aquarium in Australia, Mar del Plata Museum of the Sea in Argentina, Loro Parque in Spain and Ski Dubai in United Arab Emirates, Calgary Zoo in Canada, Odense Zoo in Denmark and many other collections.
The king penguin is the emblem of Edinburgh Zoo.
Roger Tory Peterson's ornithological nickname was "King Penguin".
Notable king penguins
- Brigadier Sir Nils Olav, the Edinburgh-based mascot and colonel-in-chief of the Royal Norwegian Guard
- Misha, a central character and metaphor in two novels by Ukrainian writer Andrey Kurkov
- The king penguin is also the species of penguin represented by the popular character Pondus, an image found on various paraphernalia in many retail stores throughout Canada. Pondus originates in Danish children's books written and photographed by Ivar Myrhøj and published in 1997 by Lademann publisher in the late 1960s. These penguins appeared in the production of Batman Returns.
- Opus the Penguin, a fictional character in the comic strips Bloom County, Outland, and Opus, is a king penguin and the most famous character of the comic strips.
- Lala the Penguin became a viral video star after an Animal Planet special featured him venturing to a nearby market in Japan to fetch a fish with a specially made backpack.
References
Citations
Bibliography
- Williams, Tony D. (1995). The Penguins. Oxford, England: Oxford University Press. ISBNÂ 019854667X.Â
External links
- Aptenodytes patagonicus, the University of Michigan Museum of Zoology's Animal Diversity Web
- King penguin videos, photos & sounds, the Internet Bird Collection
