New Zealand fur seals communicate through posture and physical movement. Territory boundaries and readiness to fight can be recognized through these actions. Status of males can be assessed and established by the full neck display, where the smaller-necked males avoid the confrontation. The full neck posture is described as sitting in an upright, vertical position. The chest is protruding out, head is tilted back and nose is pointed up towards the sky. If the two males are the same size, the full neck display is done for much longer where the male’s chests keep in contact with the other. In order to prolong the display, while maneuvering for an attack position neck waving is conducted. When they carry their neck and head low dipped position, it’s to indicate submission; either after losing a full neck display or to avoid a fight in general. The male seal that has lost the full neck display faces away to appease the winner. The alert posture shows general awareness, where an open-mouth display is used as an aggressive and a submissive display. Young pups have also been seen doing these displays during play-fighting with one another, however as the pups get older, they are more aggressive and skilled.
New Zealand fur seals also produce vocalizations, to give low intensity threatening calls. Territorial males will often bark to demonstrate their status or give a loud, deep, throaty, gruff call known as a choke call. The bark can also show sexual interest, where both males and females will whine or squeal to be more submissive. Male fur seals also whine or squeal to appease the winning male after a fight, while females threaten others by producing a high-pitched raspy growl. When a female needs to locate her pup she uses both vocalization and vision. Once the female leaves the water she holds her body upright, extends and arches her head and neck forward searching, producing a high-pitched, rising screech. The returned call from the pup is also a high-pitched screech, but more monotone. To confirm recognition the female uses her olfactory senses to either accept or reject the pup as they sniff each other’s faces and noses. The seal’s whiskers are useful in sensing, underwater vibrations and therefore locate food.
Communication Channels: visual ; tactile ; acoustic ; chemical
Other Communication Modes: pheromones
Perception Channels: visual ; tactile ; acoustic ; vibrations ; chemical
New Zealand fur seals are listed as a low risk on the IUCN Red List, because they were once harvested by the native Polynesian culture and European sealers in the 1900s. In 1972, fur seals were given national protection. Trawling nets have been a source of drowning and entanglement to more than 10,000 New Zealand fur seals from 1989 to 1998. Hence, environmental groups are advocating for the creation of a trawl net that will not catch marine mammals. Environmentalists are also advising fish farms to build seal-proof barriers or away from fur seal habitats. Tourism also causes disturbances for the seals. They will often abandon those areas for quieter island shores. New Zealand fur seals are now protected by laws in Australia and New Zealand. All marine mammals of New Zealand are protected by the Marine Mammals Protection Act of 1978. In 2004, the Department of Conservation established a 5-year Conservation Plan. The Australian Commonwealth Government and the State Government each have their own jurisdiction over all marine animals that are within 4.8 km of the coast. New Zealand fur seals are protected by the Marine Mammal Sanctuary that was created in the Auckland Islands and by UNESCO in 1998 when they granted the New Zealand’s subantarctic islands “World Heritage” status. In 1999 a Conservation Action Plan was published for all Australian seals. On the eastern side of Macquarie Island in 2000, a 16 million hectare Marine Park was established. The Tasmanian government then encompassed all of Tasmania’s waters and 5.6 km adjoining Tasmania into the Macquarie Island Nature Reserve. These parks, reserves, laws, conservation plans and environmentalist groups successfully protect New Zealand fur seals. Since conservation efforts went into effect, seal population numbers have been on the rise.
US Federal List: no special status
CITES: appendix ii
State of Michigan List: no special status
IUCN Red List of Threatened Species: least concern
New Zealand fur seals cause negligible economic harm to humans. They often get caught in fishery nets and squid trawls, which could cause a negative economic impact. As seal populations grow, collisions with motor vehicles are on the rise.
New Zealand fur seals were a popular source of food and clothing to the Polynesian culture. When the European sealers arrived in the 19th century, they nearly caused the extinction of fur seals. Today, New Zealand fur seals also have become a popular modern day tourist attraction. To increase the profit of tourism, the tourist operations have created swim-with-seal programs.
Positive Impacts: food ; body parts are source of valuable material; ecotourism ; research and education
New Zealand fur seals host bacteria such as Mycobacteria tuberculosis and Campylobacter jejuni along with a few parasites. Lungworms such as Parafilaroides normani and Otostrongylus spp. also have been found along with respiratory mites (Orthohalaracne). New Zealand fur seals may also have blubber-cysts, which are the larvae of the cestode, Phyllobothrium enclosed in a cyst. Hookworms (Uncinaria spp.) and large roundworms such as Contracaecum, Psuedoterranova, Phocascaris and Anisakis are the most common parasites found in fur seals. Large amounts of these roundworms have been known to cause stomach ulcers.
Commensal/Parasitic Species:
Known predators include sharks, orcas, leopard seals, New Zealand sea lions, and humans. The only primary anti-predator adaptation the New Zealand fur seal has acquired through evolution is its coat color that blends into its rocky land surroundings, its ability to swim swiftly through water, and its ability to climb onto shore.
Known Predators:
Anti-predator Adaptations: cryptic
New Zealand fur seals have a pointed nose, long whiskers and ear flaps. The adult coat consists of two layers, a topcoat that is a dark grey-brown on the dorsal side, which gradually lightens to a lighter gray-brown underside, provides a sense of camouflage, and a thick undercoat. Seals dark appearances comes from their deep chestnut undercoat and the dark gray coarse guard hairs of the topcoat. When the fur is wet, it appears darker, but when it is dry the white tipped guard hairs give off a silvery sheen. At five months, the pups shed their black coats for their more adult silvery-grey coats. The bulls have long, thick guard hairs that make up their coarse mane. The females do not develop this mane. New Zealand fur seals are sexually dimorphic. The males are three times the females’ weight and 1.3 times longer. Bulls are massive throughout their neck and shoulders, while females possess an overall slender physique. Even male pups are significantly larger than female pups, which is due the high lipid reserves of female pups, while the male pups consist of more lean muscle tissue. Adult males average 1.5 to 2.5 m long and weigh 120 to 180 kg. Adult females average 1 to 1.5 m long and 30 to 50 kg. The largest male on record weighed 250 kg and the largest female weighed 90 kg. Physically there are no differences between the New Zealand fur seal and the Australian fur seal. Only genetic differences distinguish them.
Range mass: 30 to 250 kg.
Average mass: Males: 120 to 180, Females: 30 to 50 kg.
Range length: 1 to 2.5 m.
Average length: Males: 1.5 to 2.5, Females: 1 to 1.5 m.
Sexual Dimorphism: male larger; sexes shaped differently
Other Physical Features: endothermic ; bilateral symmetry
In the wild, the oldest observed New Zealand fur seals were a 25 year-old female and a 19-year-old male. The average lifespan in the wild is assumed to be 15 years for a male and 12 years for a female. However, the first year is the hardest - during the first 300 days, pup mortality is approximately 40%. The only captive age recorded was 23.1 years.
Range lifespan
Status: wild: Female-25, Male-19 (high) years.
Average lifespan
Status: wild: Female-12, Male-15 years.
Range lifespan
Status: captivity: 23.1 (high) years.
The New Zealand fur seals often inhabit rocky coastlines and offshore islands that provide protection from the strong ocean waves. They seem to prefer beaches with large rocks, reefs just off the coast and smooth rocky ledges to gain easy access to the sea. Warmer islands tend to have rock pools that the seals use for cooling. Areas of vegetation that contain tussock and scrub are the usual sanctuaries of breeding seals and their young. Non-breeding colonies are more flexible in their choice of habitat Females are mid-water feeders with the distance and depth depending on the season and the age of their pups. During the breeding season, they will feed just beyond the continental shelf. During the fall and winter seasons, they will venture out for longer periods of time and dive further depths. Adult males feed over the continental slope and the juvenile seals forage in areas specifically containing the migrating lanternfish. Both the adult males and females will forage in shallow waters (0 to 20 m), but most often do benthic dives off the continental slope (females 60 to 80 m and males 100 to 200 m). The longest dive and deepest depth recorded for the females are 9.3 minutes and 312 m, whereas for males they are 14.8 minutes and 380 m.
Range elevation: Sea Level (low) m.
Range depth: 0 to 380 m.
Habitat Regions: temperate ; terrestrial ; saltwater or marine
Aquatic Biomes: reef ; coastal
New Zealand fur seals (Arctocephalus forsteri) are a non-migratory coastal species. Prior to being driven to near extinction, the population was historically found all around the North and South Islands including many offshore islands and sub-Antarctic islands. Today, they are found in New Zealand, around South Island, Big Green Island, Open Bay Islands, West Coast, Cape Foulwind, Cascade Point, Wekakura Point, Three Kings Islands, eastern Bass Strait, the Nelson-northern Marlborough region, Fjordland, New Zealand's sub-Antarctic islands Snares, Campbell, Chatham Islands, Antipodes, Bounty Islands, Stewart Island, the islands of the Foveaux Strait, a small colony at Cape Palliser near Wellington on the North Island and near the continental shelf edge of Otago Peninsula. There is also a population in southern and western Australia, Kangaroo Island, Tasmania and Victorian coastal waters, although the two New Zealand and Australian populations rarely overlap. On Australia’s sub-Antarctic Macquarie Island, a population of young non-breeding males was discovered. They are believed to have originated from New Zealand. The distribution of seals across this range is largely a result of the distribution of their food source. When New Zealand fur seals migrate it’s during the breeding season. However, during the summer, they stay closer to the rookery (70 to 80 km) then they do during the fall and winter seasons (162 to 178 km).
Biogeographic Regions: australian (Native ); oceanic islands (Native ); indian ocean (Native ); pacific ocean (Native )
Other Geographic Terms: island endemic
The New Zealand fur seals are opportunistic foragers and will vary their diet according to what is available in the season and their location. They prey on several different cephalopods, fish, and birds throughout the year. The New Zealand fur seals can use their whiskers to feel underwater vibrations to help them to locate their food. Some of the animals they have been found to eat are: small penguins like the rockhopper penguins, short-tailed shearwaters, arrow squid, broad squid, warty squid, Antarctic flying squid, butterfish, New Zealand octopus, krill, lamprey, blind eel, ling, ahuru, crayfish, crab, lanternfish (Myctophidae, Symbolophonts, Lampanyctodes hectoris, Gymnoscopelus, Electrona), juvenile red cod, blue cod, flounder, whiptail, kahawai, horse mackerel, redbait, anchovy, ocean jackets, hagfish, spiny dogfish, school shark, sprat, silverside, lightfish, hoki, rattail, tarakihi, opalfish , Graham's gudgeon, barracouta, rostfish, warehou, lemon sole, sole, wary fish, dory, yelloweyed mullet, dwarf cod, Oliver's rattail, yellow weever, silver warehou, Southern blue whiting, javelin fish, deepsea smelt, common roughy, seaperch, and pilchard. Very few of these species are commercially important.
Animal Foods: birds; fish; mollusks; aquatic crustaceans; other marine invertebrates
Primary Diet: carnivore (Eats terrestrial vertebrates, Piscivore , Molluscivore , Eats other marine invertebrates)
New Zealand fur seals have a polygynous system, in which the male defends his territory with his harem of 5 to 8 females. As an island-hopper, a male fur seal will choose an island as his breeding site. When they arrive at an island, males will compete with each other to establish their territories a full two weeks before pregnant females come ashore. Successful males with established territories are typically those between 7 and 15 years of age. Both male and female seals that aren’t breeding find other hauling grounds to rest upon during that season. The ideal territory has many shaded areas for the male and his group of females to cool themselves. These sheltered areas near the sea are frequently fought over throughout the breeding season and seldom left unoccupied by the territory holder. Seals appear on the hauling grounds, which allow easy access to and from the sea, around late October and stay until at least early February. As the breeding season progresses and the number of territorial males increases, the size of an individual’s territory decreases. Most communication during the breeding season is aggressive. The males will herd the females to keep them on their territory and away from the other males. The longer the female is on a male’s territory, the higher the chances are that she will mate with him. Each male performs his herding techniques slightly different from the others. Females are allowed to move about the hauling grounds, but the herding territorial males make it difficult by blocking access for up to an hour at times. Smelling is another key part of their mating behaviors. Males will smell the face and perineal regions of females to determine if the female is ready to mate. If the female is not ready to receive the male she displays aggressive behaviors such as growling, snapping and moving away. Females become more aggressive right before and after birth. Around eight days after giving birth, the female again goes into estrous. When the female is in estrous she will show interest in the male who occupies the territory she gave birth in by rubbing up against him and displaying very little aggression. The male detects the female’s sexual readiness by olfaction primarily. Copulation consists of mutual touching, and the male mounting and biting. When the female begins to the resist the male, he soon ejaculates and dismounts the female. The entire copulation can take from 5 to 30 minutes.
Mating System: polygynous
The breeding season for the New Zealand fur seal starts in late October and ends by early February. To increase breeding opportunities, males will remain ashore for as long as possible, surviving off energy reserves. The male will not eat for two to three months of breeding season. Cows typically mate once a year and have a gestation period of nine months. After fertilization the embryo goes through a 2 to 4 month delayed implantation. This allows females to birth and mate in the same breeding season. It also allows her body recovery time between birthing and the development of her next pup. The pups are born between late November and mid-January, with an average length of 40 to 55 cm. These pups are precocial, and can start suckling within 60 minutes. At 9 to 10 months of age the pups are weaned. There is significant weight variation in the pups at birth, which may be explained by the considerable sexual dimorphism between the two sexes. Male pups weigh on average 3.9 to 5.6 kg at birth and females at birth weigh 3.3 to 4.8 kg. At 290 days old the male pups weighed 14.1 kg and the females were 12.6 kg. From birth to 240 days of age the pups gained on average 24 g and 0.86 cm a day, but this rate slowed as they continued to age. Both male and female New Zealand fur seals reach sexual maturity around four to five years of age. Females will deliver their first pup at this time, but males don’t become territorial until 8 to 10 years because their body size does not compete with other males. Seven to eight days after giving birth, the cows will mate with the bull closest to her. Usually this will end up being the bull in whose territory they reside. Females breed anytime throughout the breeding season. However, only females breeding for the first time or females that didn't birth and rear a pup the year before are early season breeders.
Breeding interval: The New Zealand fur seal breeds once yearly.
Breeding season: The New Zealand fur seal breeding season is between late October and early February.
Range number of offspring: 0 to 1.
Average gestation period: 9 months.
Average weaning age: 9 to 10 months.
Average time to independence: 9 to 10 months.
Range age at sexual or reproductive maturity (female): 4 to 8 years.
Average age at sexual or reproductive maturity (female): 5 years.
Range age at sexual or reproductive maturity (male): 4 to 5 years.
Key Reproductive Features: seasonal breeding ; gonochoric/gonochoristic/dioecious (sexes separate); sexual ; fertilization ; viviparous ; delayed implantation
Average birth mass: 3833.33 g.
Average gestation period: 236 days.
Average number of offspring: 1.
When New Zealand fur seal cows have have pups they protect and nurse it. Six to twelve days after giving birth, cows will leave their pup with other pups and start the feeding/weaning cycle. Mothers will go to sea and feed for three to eight days before returning to their pup and let it suckle for two to seven days. As the pup gets older, the foraging trips the cow takes gradually become longer and her time ashore becomes shorter. Harems occur when multiple females loyal to territorial bulls return to the bull’s territory. When several of the mothers simultaneously leave their pups for longer periods on feeding trips, the pups gather into small groups called pods until each hears the call of its mother and returns to her to suckle. The older the pups get, the more adventurous they become. They swim in water pools, play with the other pups, and mimic battles. The birth mass of the pup is related to the changes in yearly conditions such as place of birth, the mother’s age, her experience, prey abundance, and the mother’s foraging efficiency.
Parental Investment: precocial ; female parental care ; pre-independence (Provisioning: Female, Protecting: Female)
Yeni Zelandiya dəniz pişiyi (lat. Arctocephalus forsteri) — Qulaqlı suitilər fəsiləsinə daxil olan Dəniz pişikləri yarımfəsiləsinə aiddir. Cənub dəniz pişikləri cinsinə daxildir.
Yeni Zelandiya dəniz pişiyi boz-qəhvəyi rəngdə olur. Onların uzunluğu 250 sm, çəkisi 70 kq-dan çox olur.
Bu növün nümayəndələri əssasən Yeni Zelandiyanın cənub, Avstraliyanın cənub və qərb sahillərində yaşayır. Onların koloniyalarına Çatem arxioelaqı, Antipodov, Kampel və Oklend adalarında rast gəlinir. Bir necə mini isə Tasmaniya adasında qərar tutur. Çütləşmə dönəmində Makkuori adalarında qədər gəlirlər. Bəzi hallarda isə azaraq Yeni Kaledoniya adalarında rast gəlinir.
İri koloniyalar Avstraliya sahillərində artıq XIX əsrdə demək olar ki, tamamən məhv edilir. Sonradan ov Yeni Zelandiya ərazisinə keçir və 1925-ci ildə isə burada da tükənir. Çox az bir qismi ovçulardan mağaralarda gizlənir. Hazırda isə onların ümumi sayı 60 min baş təşkil edir. Sayları ilbəil artır. Yeni Zelandiyanın şimal ərazilərində yeni koloniyalar məskən salır. Bu isə onların arealının genişlənməsi deməkdir.
Bu növün Avstraliyada yerləşən populyasiyası 35-min başdır. Burada onların inkişafı üçün geniş imkanlar vardır.
Yeni Zelandiya dəniz pişiyi (lat. Arctocephalus forsteri) — Qulaqlı suitilər fəsiləsinə daxil olan Dəniz pişikləri yarımfəsiləsinə aiddir. Cənub dəniz pişikləri cinsinə daxildir.
Otarienn Zeland-Nevez (Arctocephalus forsteri) a zo ur bronneg mor kigdebrer hag a vev war aodoù Zeland-Nevez ha su Aostralia.
Otarienn Zeland-Nevez (Arctocephalus forsteri) a zo ur bronneg mor kigdebrer hag a vev war aodoù Zeland-Nevez ha su Aostralia.
L'ós marí de Nova Zelanda (Arctocephalus forsteri) és una espècie de pinnípede de la família dels otàrids. Viu a les costes occidentals i meridionals d'Austràlia i als voltants de Nova Zelanda.
L'ós marí de Nova Zelanda (Arctocephalus forsteri) és una espècie de pinnípede de la família dels otàrids. Viu a les costes occidentals i meridionals d'Austràlia i als voltants de Nova Zelanda.
Der Neuseeländische Seebär (Arctocephalus forsteri) ist auch als Australischer Seebär bekannt, was jedoch zu Verwechslungen mit einer Unterart des Südafrikanischen Seebären führen kann. Er gehört zur Gattung der Südlichen Seebären.
Die Farbe des Neuseeländischen Seebären ist graubraun. Männchen haben außerdem eine schwarze Halsmähne. Bullen erreichen eine Größe von 250 cm und ein Gewicht von 180 kg. Kühe sind mit 150 cm und 70 kg sehr viel kleiner.
Der Neuseeländische Seebär lebt heute vornehmlich an den Küsten der Südinsel Neuseelands sowie an den Küsten von Süd- und Westaustralien. Weitere Kolonien gibt es auf den subantarktischen Antipoden-Inseln, den Aucklandinseln, den Bountyinseln, den Chatham Islands und der Insel Campbell Island. Einige hundert Seebären leben außerdem an der Südküste Tasmaniens.
Außerhalb der Paarungszeit wandern Neuseeländische Seebären umher und finden sich dann auch an anderen Orten ein. Vor allem die Küsten der Macquarieinsel sind alljährlich gefüllt mit jugendlichen Seebärenbullen, die noch zu jung sind, um ein Territorium zu behaupten. Einzelne verirrte Individuen hat es schon bis an die Küsten Neukaledoniens verschlagen.
Die großen Kolonien an den australischen und tasmanischen Küsten wurden am Ende des 18. Jahrhunderts vollständig vernichtet. Anschließend setzten die Robbenjäger das Massenschlachten in Neuseeland fort, wo alle Kolonien bis 1825 vernichtet waren. Nur wenige Seebären überlebten in Höhlen, die für die Robbenjäger nicht zugänglich waren. Die Bestände an Neuseelands Küsten umfassen heute wieder 60.000 Tiere und wachsen jährlich weiter an. In jüngerer Zeit kam es vereinzelt auch zu Jungenaufzuchten an Neuseelands Nordinsel, was bedeuten könnte, dass das Verbreitungsgebiet auch geographisch ausgedehnt wird.
Die Bestände in Australien werden auf 35.000 Tiere geschätzt. Dort hat der Neuseeländische Seebär ein geographisch größeres Verbreitungsgebiet, die einzelnen Kolonien sind aber weniger umfangreich.
Der Neuseeländische Seebär wird in der Roten Liste gefährdeter Arten der Weltnaturschutzunion IUCN als nicht gefährdet (Least Concern) geführt. Dennoch ist er wie alle Arten seiner Gattung Arctocephalus im Washingtoner Artenschutzübereinkommen CITES, Appendix II angeführt, wodurch er weltweit vor unbeschränktem Handel geschützt wird. Diese Haltung wird von der Europäischen Union in der EU-Artenschutzverordnung (EG) Nr. 338/97 Anhang B übernommen, wodurch automatisch sämtliche EU-Mitgliedsstaaten zum Schutz verpflichtet sind. Das schlägt sich wiederum in der Bundesrepublik Deutschland im Bundesnaturschutzgesetz nieder, wo die Art als besonders geschützt bezeichnet wird.
Der Neuseeländische Seebär (Arctocephalus forsteri) ist auch als Australischer Seebär bekannt, was jedoch zu Verwechslungen mit einer Unterart des Südafrikanischen Seebären führen kann. Er gehört zur Gattung der Südlichen Seebären.
Arctocephalus forsteri es un specie de Arctocephalus.
Arctocephalus forsteri (common names include the Australasian fur seal,[3] South Australian fur seal,[4] New Zealand fur seal,[5] Antipodean fur seal, or long-nosed fur seal) is a species of fur seal found mainly around southern Australia and New Zealand.[1] The name New Zealand fur seal is used by English speakers in New Zealand; kekeno is used in the Māori language.[6][7] As of 2014, the common name long-nosed fur seal has been proposed for the population of seals inhabiting Australia.[1]
Although the Australian and New Zealand populations show some genetic differences, their morphologies are very similar, and thus they remain classed as a single species. After the arrival of humans in New Zealand, and particularly after the arrival of Europeans in Australia and New Zealand, hunting reduced the population to near-extinction.[1]
Males have been reported as large as 160 kg (350 lb); their average weight is about 126 kg (278 lb).[1][8] Males can be 2 m (6 ft 7 in) long. Females are between 30 and 50 kg (66-110 lbs) on average, and can be as long as 1.5 m (4 ft 11 in). Newborn pups are 3.3–3.9 kg (7.3-8.6 lbs) on average, and between 40 and 55 cm (1.3-1.8 ft) long. At 290 days old males are about 14.1 kg (31 lb), and females are about 12.6 kg (28 lb).[1] Like other otariids, they have external ears and hind flippers that rotate forward, which visibly distinguish them from true seals.[6] They have a pointy nose with long pale whiskers.[6] Fur seals are covered by two layers of fur. The coat is grey-brown on their back, and lighter on their belly.[6] Some have white tips on longer upper hairs, which can give them a silver-like appearance.[6]
So called "Upland Seals" once found on Antipodes Islands and Macquarie Island have been claimed as a distinct subspecies with thicker furs by scientists although it is unclear whether these seals were genetically distinct.[9]
The species occurs in Australia and New Zealand. It is found in the coastal waters and on the offshore islands of southern Australia, from the south-west corner of Western Australia to just east of Kangaroo Island in South Australia, and also in southern Tasmania and the subantarctic Macquarie Island. Small populations are forming in Bass Strait and coastal waters of Victoria and New South Wales as far as the mid-north coast. Before the arrival of humans in New Zealand, the species bred around all the New Zealand mainland and its subantarctic islands. There are now established and expanding colonies around the entire South Island, on Stewart Island and all of the New Zealand subantarctic islands. There are also newly established breeding colonies on the North Island.[1]
The species can "porpoise" out of the water when travelling quickly at sea.[1] They can dive deeper and longer than any other fur seal.[6] Females can dive for about 9 minutes and to a depth of about 312 metres, and can dive deeper and longer in autumn and winter. Males can dive for about 15 minutes to a depth of about 380 metres.[1] On average, the species typically only dives for 1–2 minutes.[6] When they dive for food they dive deeper during the day but shallower at night, because during the day their prey typically migrates to deeper depths and migrates back up during the night (diel vertical migration).[6]
Lactating females alter their dive patterns in order to regularly care for their young. Dives are shorter, from around 9 minutes down to 5 minutes. Several longer trips may be taken at first to find patches of prey. The shorter dives then utilise these patches. Due to the differences in diving pattern between males and females, there is very little inter-sexual competition for food sources. Males typically forage over continental shelf breaks in deeper water, while females typically utilise the continental shelf as foraging grounds. It is believed that differences in diving abilities and depths could be the cause of some sexual dimorphism between males and females.[10]
Diving behaviour by the pups begins in the months leading up to weaning, when the pups are nursing less. The pups begin to dive from the age of 6–10 months, yet weaning is known to occur between the ages of 8 and 11 months, so the young pups do not have much time to learn to forage. The pups need to progressively develop nocturnal diving skills while they still have their mothers' milk to fall back on if dives are unsuccessful. Age, physiological development, and experience are important factors for success in hunting and contribute to the development of the pups' diving ability and behaviour. This transitional period, when young pups are becoming nutritionally independent while their foraging efficiency is rather low, is a time of high risk, and mortality can be very high. Based on scat samples, it has been found that the pups start by eating cephalopods and eventually making their way to fish, but this may just be a result of prey availability during different times of the year.[11]
Males vocalise through a bark or whimper, either a guttural threat, a low-intensity threat, a full threat, or a submissive call. Females growl and also have a high-pitched pup attraction wail call.[1] Pup-attraction calls allow communication from longer distances. Once together, females use olfactory recognition to confirm the pup as their own.[12] In males, the full neck display is a non-combative posture that functions as a threat to surrounding males by which they are able to assess each other's dominance status.[12]
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Females mature between 4 and 6 years old, and males mature between 8 and 10 years old.[1] These seals are polygynous.[1][6] Males obtain and guard territory in late October before females arrive.[1] Often females mate only once a year, and this usually occurs eight days postpartum for about 13 minutes on average. Females have a delayed implantation of the fertilised egg, so that implantation on the uterine wall does not occur for 3 months.[6] Gestation occurs for 9 months[6] Females are more aggressive near the time of birth, and do not like to be approached right after birth.[8] Females will continue to reproduce until their death which is on average between 14 and 17 years of age.[6]
Females first arrive on the shore between November and January,[1] just a few days before giving birth, and stay close to the birth site for up to ten days. When they are close to labour they become very restless and irritable. When beginning labour, which can last as much as five hours, they lie down and toss their head in the air, straining forward on their fore flippers, lifting their hind quarters, or moving laterally, before slowly lowering their head down, a process they repeat until they finally give birth. In one study, observations of the actual birth, starting from when the pup was first seen, found an average of 2 minutes for a head-first delivery, but an average of 6.5 minutes if the pup came out tail first. Immediately after birth the mother begins frequently sniffing the newborn pup to better identify when she has to find it after a trip out to sea. Pups are fairly mature at birth, and within 60 minutes they start suckling for about 7 minutes. Eventually the suckling can exceed 33 minutes.[8]
The mothers may take from 45 minutes to 3 days before leaving the pups to swim, and 6–12 days to go on longer feeding trips. Even then, the mothers tend to not leave the pups for longer than 2 days. When the pups are about 21 days old they have been seen to congregate into little pods while their mothers are away. When the females return they only feed their own pups, and have been seen to be hostile toward pups that are not their own.[13]
Female seals have been documented to have a gradual increase in trips for feeding throughout lactation. It has been found that mothers who have sons made longer foraging trips then the mothers who had daughters during the lactation period. When observing growth patterns in the male and female pups within two cohorts, it is recognised that the growth patterns are similar, however the males grow faster and are weaned off nursing heavier in some years.[14] Suckling can occur for about 300 days. Pups start to eat solid food just before weaning,[6] and are eventually weaned around September, when they disperse.[8][6]
Pup mortality has been attributed to both natural factors and human interaction. The biggest natural cause of death for pups is starvation, followed by suffocation in the amnion, stillbirth, trampling, drowning, and predation.[15] Human factors include the handling of pups, tagging, and human presence in general.[15]
Their diet includes cephalopods, fish, and birds.[1] In New Zealand, New Zealand octopus and arrow squid make up most of their cephalopod diet.[16] Individuals located near their southern range limit have been known to eat penguins as part of their diet.[16] Stomach contents have been analysed and shown to include Australian anchovy, barracouta, Paralichthyes flounders, broadgilled hagfish, pouched lamprey, red cod, school shark, and many other species.[17] Further analysis of otoliths from their scat show that for fish prey species, lanternfishes composed the majority of their fish diet, followed by Australian anchovies, ahuru, and hoki.[16] There are different factors that affect their diet, such as season, sex, breeding, surrounding colony, oceanography, and climatic patterns.[17]
Known predators are killer whales, sharks, male New Zealand sea lions, and possibly leopard seals.[1] New Zealand sea lions are also known to target pups as their prey.[18] Several regurgitations by sea lions have been found to contain remains of fur seal pups, some with plastic tags previously attached to female fur seal pups.[18]
Before the arrival of humans, the seals bred around all of New Zealand. Hunting by the first New Zealand settlers, the Maori, reduced their range. Commercial hunting from shortly after the European discovery of New Zealand in the 18th century until the late 19th century reduced the population near to extinction.
Today, commercial fisheries are one of the main causes of death in New Zealand fur seals, usually by entanglement and drowning.[1] Monitoring of these pinnipeds in the Kaikoura region found that entanglements with green trawl nets and plastic strapping tape were the most common.[19] A little less than half of the individuals were successfully released with good chances of survival even after significant entanglement wounds.[19] It has been estimated by the Royal Forest and Bird Protection Society that over 10,000 seals could have drowned in nets between 1989 and 1998.[8] They are also known to have been shot by commercial and recreational fishermen, because they are assumed to interfere with fishing gear. How often these shootings occur is unknown, but pressure groups have stated that the conflict between the seals and commercial fisheries is expected to increase.[20] On 21 August 2014, two decomposing animals were found beheaded near Louth Bay in South Australia. The circumstances of their deaths were considered suspicious and an investigation followed their discovery.[21] In 2015, several conservative members of Parliament encouraged public debate around the potential implementation of seal culling in South Australia in response to increasing interactions with South Australian commercial fisheries. As of July 2015, the killing of long-nosed fur seals remains an illegal act.
Human activity near seal rookeries has been correlated with distress and panic, resulting in indirect deaths of pups.[15] The use of metal cattle ear tags on pups has also been associated with a decrease in pup fitness due to incomplete healing of the tag site.[15]
In Australian Commonwealth waters, Arctocephalus forsteri is protected under the Environment Protection Biodiversity Conservation (EPBC) Act 1999, under which it is listed as a protected marine species.[22] The species is also protected within the jurisdictions of the following Australian states:
The species received protection by the creation of the 16 million hectare Macquarie Island Marine Park, located on the eastern side of Macquarie island. In 2000, the Tasmanian government extended the Macquarie Island Nature Reserve by 3 nautical miles surrounding the island.[25]
In New Zealand, the species is protected by the Marine Mammals Protection Act 1978, which works to conserve marine animal species; it specifies that all wild pinnipeds cannot be touched or fed.[1]
South Island, New Zealand
coming ashore below Taiaroa Head, near Dunedin, New Zealand
pups at Palliser Bay, New Zealand
at Castlepoint, New Zealand
Arctocephalus forsteri (common names include the Australasian fur seal, South Australian fur seal, New Zealand fur seal, Antipodean fur seal, or long-nosed fur seal) is a species of fur seal found mainly around southern Australia and New Zealand. The name New Zealand fur seal is used by English speakers in New Zealand; kekeno is used in the Māori language. As of 2014, the common name long-nosed fur seal has been proposed for the population of seals inhabiting Australia.
Although the Australian and New Zealand populations show some genetic differences, their morphologies are very similar, and thus they remain classed as a single species. After the arrival of humans in New Zealand, and particularly after the arrival of Europeans in Australia and New Zealand, hunting reduced the population to near-extinction.
La Forstera arktocefalo, en latina scienca nomo Arctocephalus forsteri, konata ankaŭ kiel Aŭstralia ledofoko, Novzelanda ledofoko aŭ suda ledofoko, estas specio de foko troviĝanta ĉe la suda marbordo de Aŭstralio, la marbordo de la Suda Insulo de Novzelando, kaj ĉe kelkaj malgrandaj insuloj sude kaj oriente de tiuj lokoj. Kolonioj nur de maskloj estas en la marbordo de la Kuka Markolo ĉe Norda Insulo ĉe Wellington kaj vagantoj troviĝas tiom norde kiom ĝis Nov-Kaledonio. En Novzelando Maorioj nomigas ilin kekeno. Kvankam la populacioj de Aŭstralio kaj de Novzelando montras iome da genetikaj diferencoj, ties morfologioj estas tre similaj, kaj tiele ili restas klasitaj kiel sola specio.
El lobo marino de Nueva Zelanda o lobo marino del sureste (Arctophoca fosteri) es una especie de mamífero pinnípedo de la familia de los otáridos que habita en la costa meridional de Australia y en la Isla Sur de Nueva Zelanda, así como en pequeñas islas al sudeste de la misma.[2]
En la costa del Estrecho de Cook, en la Isla Norte cerca de Wellington se pueden encontrar colonias de machos. La especie tiene dos nombres comunes porque las colonias de Australia y de Nueva Zelanda no se mezclan. Aunque ambas poblaciones muestran algunas diferencias genéticas, sus morfologías son muy similares y por tanto se los considera una misma especie.
Este animal fue muy cazado justo después del descubrimiento europeo de Nueva Zelanda, hasta finales del siglo XIX. La población de la foca de Nueva Zelanda cayó por debajo del 10% del número original. En Nueva Zelanda, el lobo marino se encuentra protegido bajo el Acta de Protección de Mamíferos Marinos en 1978.
Lobo marino neozelandés Arctocephalus forsteri en la Isla Sur de Nueva Zelanda
Lobo marino neozelandés saliendo del agua en Taiaroa Head, cerca de Dunedin
Crías de lobo marino neozelandés en Palliser Bay
El lobo marino de Nueva Zelanda o lobo marino del sureste (Arctophoca fosteri) es una especie de mamífero pinnípedo de la familia de los otáridos que habita en la costa meridional de Australia y en la Isla Sur de Nueva Zelanda, así como en pequeñas islas al sudeste de la misma.
En la costa del Estrecho de Cook, en la Isla Norte cerca de Wellington se pueden encontrar colonias de machos. La especie tiene dos nombres comunes porque las colonias de Australia y de Nueva Zelanda no se mezclan. Aunque ambas poblaciones muestran algunas diferencias genéticas, sus morfologías son muy similares y por tanto se los considera una misma especie.
Este animal fue muy cazado justo después del descubrimiento europeo de Nueva Zelanda, hasta finales del siglo XIX. La población de la foca de Nueva Zelanda cayó por debajo del 10% del número original. En Nueva Zelanda, el lobo marino se encuentra protegido bajo el Acta de Protección de Mamíferos Marinos en 1978.
Arctocephalus forsteri Arctocephalus generoko animalia da. Artiodaktiloen barruko Otariidae familian sailkatuta dago..
Arctocephalus forsteri Arctocephalus generoko animalia da. Artiodaktiloen barruko Otariidae familian sailkatuta dago..
Uudenseelanninmerikarhu eli forsterinmerikarhu (Arctocephalus forsteri) on Australian ja Uuden-Seelannin lähivesillä elävä korvahyljelaji.
Uudenseelanninmerikarhulla on suippo kuono ja selvästi erottuvat korvat. Kaksikerroksinen tummanruskea turkki joka voi märkänä näyttää lähes mustalta. Naaraan ja koiraan ero on tällä lajilla huomattaava: naaraat painavat noin 40 kg, koiraat jopa 160 kg.[2]
Nisäkäsnimistötoimikunta on ehdottanut lajille uutta suomenkielistä nimeä uuden-seelanninhylje.[3] Suomen kielen lautakunnan mukaan oikeakielisempi nimi olisi uudenseelanninhylje.[4]
Uudenseelanninmerikarhu eli forsterinmerikarhu (Arctocephalus forsteri) on Australian ja Uuden-Seelannin lähivesillä elävä korvahyljelaji.
Arctocephalus forsteri
L'Otarie à fourrure de Nouvelle-Zélande est un mammifère appartenant à la famille des Otariidae.
Le dimorphisme sexuel est important, le mâle fait en moyenne deux fois la taille de la femelle[1].
Elles vivent dans l'océan Indien, dans les eaux bordant la Nouvelle-Zélande et le sud de l'Australie[1].
Lecture : Les naufragés des Auckland par François Edouard Raynal, récit du naufrage du Grafton en 1864 dans lequel les survivants se nourrissent de ces mammifères.
Elles se nourrissent de céphalopodes, de poissons et d'oiseaux[1].
Les otaries à fourrure de Nouvelle-Zélande sont polygames, un mâle est en moyenne avec 5 à 8 femelles. Les mâles arrivent avant les femelles sur le site de reproduction, vers fin octobre. Il colonisent un territoire et le défendent avec des vocalisations et des combats. Les femelles donnent naissance entre mi-novembre et janvier, le plus souvent en décembre. Les petits acquièrent leur pelage d'adulte vers 3 ou 4 mois. Les femelles atteignent la maturité sexuelle entre 4 et 6 ans et les mâles entre 8 et 10 ans[1].
Arctocephalus forsteri, otarie à fourrure, Ile du Sud, Nouvelle-Zélande
Otarie à fourrure à Taiaroa Head, près de Dunedin
Petits de l'otarie à fourrure, Palliser Bay
Arctocephalus forsteri
L'Otarie à fourrure de Nouvelle-Zélande est un mammifère appartenant à la famille des Otariidae.
L'otaria orsina della Nuova Zelanda od otaria orsina meridionale, Arctocephalus forsteri, è una specie di otaria orsina diffusa intorno alle coste meridionali dell'Australia, a quelle dell'Isola del Sud della Nuova Zelanda e a quelle delle piccole isole situate a sud e a est di quest'ultima. Colonie composte da soli maschi sono situate anche sulle coste dello Stretto di Cook, presso Wellington, sull'Isola del Nord. Il nome comune otaria orsina della Nuova Zelanda viene utilizzato in Nuova Zelanda (anche se il nome originale in lingua māori è kekeno), mentre in Australia viene chiamata otaria orsina meridionale. Nonostante le due popolazioni mostrino alcune differenze genetiche, la loro morfologia è molto simile e per questo si continua a classificarle come un'unica specie.
Queste otarie sono state cacciate indiscriminatamente durante il periodo che va dalla scoperta europea della Nuova Zelanda fino alla fine del XIX secolo. La popolazione neozelandese si ridusse al 10% della popolazione originaria. Attualmente questa specie di otaria orsina è posta sotto la protezione del Marine Mammal Protection Act (1978).
Nonostante quest'animale sembri docile, è in grado di muoversi molto velocemente e non è mai consigliabile avvicinarsi ad una femmina con il piccolo o frapporsi tra uno di questi animali e l'acqua, tagliando loro la strada per fuggire in mare: i loro denti sono molto affilati ed hanno morso molti neozelandesi.
I maschi pesano normalmente circa 126 kg, ma possono arrivare a pesare anche 250 kg e misurano da 2 a 2,5 m di lunghezza. Le femmine pesano mediamente 30–50 kg e misurano circa 1,5 m. Il colore del pelo può variare dal marrone-grigiastro al nero. I cuccioli pesano alla nascita circa 4–6 kg e misurano 60–70 cm.
Otaria orsina della Nuova Zelanda, Arctocephalus forsteri, sull'Isola del Sud, Nuova Zelanda
Otaria orsina della Nuova Zelanda mentre approda a Capo Taiaroa, nei pressi di Dunedin
Otaria orsina della Nuova Zelanda a Kaikoura
Cuccioli di otaria orsina della Nuova Zelanda nella Baia di Palliser
L'otaria orsina della Nuova Zelanda od otaria orsina meridionale, Arctocephalus forsteri, è una specie di otaria orsina diffusa intorno alle coste meridionali dell'Australia, a quelle dell'Isola del Sud della Nuova Zelanda e a quelle delle piccole isole situate a sud e a est di quest'ultima. Colonie composte da soli maschi sono situate anche sulle coste dello Stretto di Cook, presso Wellington, sull'Isola del Nord. Il nome comune otaria orsina della Nuova Zelanda viene utilizzato in Nuova Zelanda (anche se il nome originale in lingua māori è kekeno), mentre in Australia viene chiamata otaria orsina meridionale. Nonostante le due popolazioni mostrino alcune differenze genetiche, la loro morfologia è molto simile e per questo si continua a classificarle come un'unica specie.
Queste otarie sono state cacciate indiscriminatamente durante il periodo che va dalla scoperta europea della Nuova Zelanda fino alla fine del XIX secolo. La popolazione neozelandese si ridusse al 10% della popolazione originaria. Attualmente questa specie di otaria orsina è posta sotto la protezione del Marine Mammal Protection Act (1978).
Nonostante quest'animale sembri docile, è in grado di muoversi molto velocemente e non è mai consigliabile avvicinarsi ad una femmina con il piccolo o frapporsi tra uno di questi animali e l'acqua, tagliando loro la strada per fuggire in mare: i loro denti sono molto affilati ed hanno morso molti neozelandesi.
Australinis jūrų lokys (Arctocephalus forsteri) – ausytųjų ruonių (Otariidae) šeimai priklausantis gyvūnas. Šie ruoniai aptinkami Naujosios Zelandijos, Vakarų ir Pietų Australijos teritoriniuose vandenyse. Suaugę patinai sveria apie 160 kg, patelės sveria apie 40 kg. Minta kalmarais, aštuonkojais, ėda kefalžuves, skumbres.
Australinis jūrų lokys (Arctocephalus forsteri) – ausytųjų ruonių (Otariidae) šeimai priklausantis gyvūnas. Šie ruoniai aptinkami Naujosios Zelandijos, Vakarų ir Pietų Australijos teritoriniuose vandenyse. Suaugę patinai sveria apie 160 kg, patelės sveria apie 40 kg. Minta kalmarais, aštuonkojais, ėda kefalžuves, skumbres.
De Nieuw-Zeelandse zeebeer of Australische zeebeer (Arctocephalus forsteri) is een zeeroofdier uit de familie der oorrobben (Otariidae). Ze komen voor langs de west- en zuidkust van Australië en rond Nieuw-Zeeland.
De Nieuw-Zeelandse zeebeer heeft een middellange, spitse snuit met een afgeronde, puntige neus. De snorharen zijn lang en wit tot beige van kleur. De mannetjes verschillen zowel in kleur als in grootte van de vrouwtjes. Mannetjes worden 145 tot 250 centimeter lang en 120 tot 185 kilogram zwaar, en hebben een donker bruinachtig-grijze vacht met een grijzige vloed. De onderzijde is bleker van kleur. De snuit is bleker van kleur. Ze hebben dikke manen rond de stevige hals, schouders en borst. Vrouwtjes zijn 125 tot 150 centimeter lang en 25 tot 50 kilogram zwaar. Vrouwtjes zijn bleker op de onderzijde van de nek en de borst.
De Nieuw-Zeelandse zeebeer jaagt voornamelijk 's nachts op pelagische vissoorten, van kleinere vissen tot barracuda's, en op inktvissen en octopussen. Soms vangen ze ook vogels als pinguïns.
Voortplantingsstranden zijn te vinden op verscheidene eilanden. In Australië strekt deze zich uit van het West-Australische Eclipse-eiland oostwaarts tot Maatsuykereiland, ten zuiden van Tasmanië. Rond Nieuw-Zeeland komen ze voor rond zowel het Noorder- als het Zuidereiland, en op de Aucklandeilanden, Bounty-eiland, Campbell-eiland, de Antipodeneilanden en Chathameiland, zuidwaarts tot Macquarie-eiland.
De voortplantingstijd valt van november tot januari, rond dezelfde tijd dat de pups worden geboren. Het vrouwtje paart ongeveer negen dagen na de worp. Als voortplantingsstranden geven ze de voorkeur aan rotsachtige kusten met schuilmogelijkheden. Anders dan andere zeeberen zijn veel Nieuw-Zeelandse zeeberen gedurende het gehele jaar op de voortplantingsstranden te vinden.
Als de voortplantingstijd is aangebroken zullen de mannetjes hun territorium verdedigen. Met brullen waarschuwen ze de andere mannetjes om niet op hun stuk strand te komen. De strijd om de territoria is zo fel, dat de mannetjes het strand niet kunnen verlaten en soms zelfs wel zeventig dagen moeten vasten.
De jongen worden tussen november en januari geboren. Jongen worden geboren met een zwartachtige vacht met een veel blekere snuit. Ze zijn 40 tot 45 centimeter lang. Mannetjes wegen bij de geboorte gemiddeld 3,9 kilogram, vrouwtjes 3,3 kilogram. Na twee tot drie maanden wordt de geboortevacht verruild voor een volwassen vacht. De dieren zullen zo'n tien tot elf maanden gezoogd worden. Na vier tot zes jaar is het vrouwtje geslachtsrijp. Mannetjes zullen waarschijnlijk pas na tien tot twaalf jaar in staat zijn territoria te vestigen op de stranden en zich voort te planten.
Er leefden rond 1990 meer dan 25.000 dieren langs de Australische kust, en nog eens 30.000 tot 50.000 dieren in Nieuw-Zeeland, en de populaties zijn sindsdien waarschijnlijk gegroeid.
Bronnen, noten en/of referentiesDe Nieuw-Zeelandse zeebeer of Australische zeebeer (Arctocephalus forsteri) is een zeeroofdier uit de familie der oorrobben (Otariidae). Ze komen voor langs de west- en zuidkust van Australië en rond Nieuw-Zeeland.
New Zealand-pelssel (Arctocephalus forsteri) er en art i øreselfamilien. Den er utbredt langs kysten av New Zealand og Australia.
Hannene kan bli opp mot 2 meter lange. Den kan veie så mye som 160 kg, men veier normalt ca 126 kg. Hunnene veier normalt mellom 30 og 50 kg, og blir opp mot 1,5 meter lange.
New Zealand-pelssel (Arctocephalus forsteri) er en art i øreselfamilien. Den er utbredt langs kysten av New Zealand og Australia.
Hannene kan bli opp mot 2 meter lange. Den kan veie så mye som 160 kg, men veier normalt ca 126 kg. Hunnene veier normalt mellom 30 og 50 kg, og blir opp mot 1,5 meter lange.
Multimedia w Wikimedia Commons Kotik nowozelandzki[3] (Arctocephalus forsteri) – gatunek morskiego ssaka z rodziny uchatkowatych. Rozróżnia się dwa podgatunki: Arctocephalus forsteri forsteri zamieszkujący wybrzeża Nowej Zelandii i Arctocephalus forsteri doriferus zamieszkujący południowe wybrzeże Australii.
Duży, silny przedstawiciel uchatkowatych, o silnie zaznaczonym dymorfizmie płciowym. Ubarwienie wierzchu ciała szaro-brązowe, spód ciała nieco jaśniejszy. Zaostrzony pysk zaopatrzony jest we włosy czuciowe o długości do 50 mm. Ma silne, ostre uzębienie.
Wybrzeża południowej i zachodniej Australii oraz pobliskie wyspy zamieszkuje odrębna populacja licząca około 7000 osobników. Obszar występowania tego gatunku na Nowej Zelandii rozciąga się wokół Wyspy Południowej i Północnej aż do wysp Macquarie, na odcinku ponad 2700 km.
Na lądzie wypoczywają na skalistych wybrzeżach. Miejsca te są zabezpieczone przez rafy i porośnięte gęstą roślinnością chroniącą zwierzęta przed upałem i sztormami.
Kotiki nowozelandzkie dobrze pływają i nurkują; pod wodą polują na ryby i inne zwierzęta morskie. Sporadycznie osobniki zamieszkujące wyspy antarktyczne polują na pingwiny. Samce są terytorialne i bronią swojego terytorium przed innymi samcami. Samice, w liczbie kilkunastu, skupiają się wokół samca, tworząc haremy.
Samiec kopuluje z kilkoma samicami. Samica po około 9 miesiącach rodzi 1 młode o masie urodzeniowej około 3,5 kg i długości 40-45 cm. Młodym opiekuje się wyłącznie samica. Samice osiągają dojrzałość płciową w wieku 4-6 lat, natomiast samce w wieku 5-6 lat.
W morzu groźne dla kotików są rekiny, np. żarłacz biały, oraz orki. W rejonach subantarktycznych poluje na nie niekiedy lampart morski.
Komercyjne polowania na kotiki nowozelandzkie rozpoczęły się w XVIII, a nasiliły w XIX wieku. Wytępiono setki tysięcy tych zwierząt i gatunek stanął na krawędzi zagłady. Uratował je mały zysk osiągany w handlu futrami. Obecnie populacja uchatek jest stabilna i szacuje się ją na 50-60 tys. osobników.
Kotik nowozelandzki (Arctocephalus forsteri) – gatunek morskiego ssaka z rodziny uchatkowatych. Rozróżnia się dwa podgatunki: Arctocephalus forsteri forsteri zamieszkujący wybrzeża Nowej Zelandii i Arctocephalus forsteri doriferus zamieszkujący południowe wybrzeże Australii.
O Lobo-marinho-da-nova-zelândia (Arctocephalus forsteri) ou kekeno na língua maori é uma espécie de lobo-marinho encontrada nas costas da Austrália e da Nova Zelândia.[1] Foram abatidos em grande número após a descoberta da Austrália o que reduziu significativamente a população, porém atualmente encontram-se protegidas por força da lei na Nova Zelândia.
O Lobo-marinho-da-nova-zelândia (Arctocephalus forsteri) ou kekeno na língua maori é uma espécie de lobo-marinho encontrada nas costas da Austrália e da Nova Zelândia. Foram abatidos em grande número após a descoberta da Austrália o que reduziu significativamente a população, porém atualmente encontram-se protegidas por força da lei na Nova Zelândia.
Nyzeeländsk pälssäl (Arctocephalus forsteri) är en art i familjen öronsälar.
Arten har gråbrun päls och hanarna har dessutom en svart man vid halsen. Nyzeeländsk pälssäl har en spetsig nos och näsan vid spetsen liknar ibland en bubbla. Dessutom finns långa morrhår. Hanen blir 250 cm lång och upp till 150 kg tung. Honan är med en längd av 150 cm och en vikt av 50 kg betydligt mindre. Ungarnas päls är med undantag av nosen och buken svartaktig. Pälsen byts ut efter cirka tre månader.[2]
Nya Zeelands pälssäl förekommer vid Nya Zeelands sydö och vid kustlinjen av södra och västra Australien. Några kolonier finns på subantarktiska öar, på Nya Zeelands nordö och på Tasmanien. Utanför parningstiden vandrar dessa djur och når ställen som är belägna längre norrut.[1]
Könsmogna hanar simmar vanligen under oktober till parningsplatsen och strider där med andra hanar om ett revir som ger bästa möjlighet att para sig. Under striden kan de få sår på huvudet eller på halsen. Honorna infinner sig i november eller december och föder sedan ungdjuret som de var dräktiga med sedan förra parningstiden. Ungefär 6 till 8 dagar efter födseln parar sig honan med en av hanarna. Dominanta hanar parar sig oftast och de kan ha ett harem med 5 till 8 honor. Några dagar efter födelsen lämnar honan ungen tillfällig för att fånga fiskar. Cirka tio månader senare slutar honan med digivning. Det befruktade ägget vilar ungefär tre månader och den egentliga dräktigheten varar cirka nio månader så att tiden mellan två parningar blir ett år. Honor blir efter 4 till 6 år könsmogna och hanar efter 5 till 6 år. Den första framgångsrika parningen sker för hanar efter 8 till 10 år.[2]
Utanför parningstiden bilar vuxna hanar flockar i ett annat område när de vilar på land. Vid parningsplatsen stannar bara ungdjur. De besöks ibland av vuxna honor. Nyzeeländsk pälssäl jagar ryggradslösa djur som bläckfiskar, fiskar och vattenlevande fåglar som pingviner. Vanligen dyker sälen en till två minuter. Ibland stannar de 14 minuter under vattenytan och når 400 meter djup.[2]
Arten jagas själv av späckhuggare, större hajar och andra stora sälar.[2]
Kolonierna på Australien och Tasmanien var vid slutet av 1800-talet nästan utdöda. På Nya Zeeland fanns 1825 inga kolonier kvar. Bara enskilda djur överlevde gömda i grottor. Fram till idag (2008) har beståndet i Nya Zeeland ökat till 60 000 individer. På senare år har mindre kolonier av arten iakttagits även på Nya Zeelands nordö. I Australien finns uppskattningsvis 35 000 individer av arten.
Nyzeeländsk pälssäl (Arctocephalus forsteri) är en art i familjen öronsälar.
Розмір тулуба у самців та самок різні. Перші дещо більше й мають довжину 250 см і вагу до 180 кг, самиці – 150 см у довжину і вагу – 70 кг. Шкіра – сіро-коричнева. У самців є грива.
Харчується новозеландський морський котик здебільшого рибою
Ці тварини мешкають здебільшого на південному острові Нової Зеландії, на півдні Тасманії та Австралії. Також зустрічаються на островах Кемпбелл, архіпелагах Баунті, Чатем та Окленд. Деякі з котиків допливають до Нової Каледонії.
Новозеландський морський котик веде сезонне життя. Взимку він перебуває здебільшого у морі, а влітку – на березі. Тут створює лежбища. Самці заводять т. зв. гареми, які існують близько 2 місяців. В цей час відбувається спарювання, линька, а також народження дитинчати. Одна самка народжує 1 котика.
До кінця XIX ст. популяція новозеландських морських котиків була величезною. Втім після заселення Нової Зеландії та Австралії набуло розвиток полювання людини за ними. До 1925 року величезні поселення котиків були майже винищенні. Тому у Новій Зеландії у 1978 році було прийнято Закон, який забороняв полювання на цих тварин та брав їх під охорону. Сьогодні у Новій Зеландії нараховується близько 60 тисяч новозеландських морських котиків, а у Австралії – близько 35 тисяч.
Arctocephalus forsteri là một loài hải cẩu lông sống chủ yếu ở vùng duyên hải Tây và Nam Úc, New Zealand, và các đảo lân cận.[1] Trong tiếng Māori, chúng mang tên kekeno.[3][4]
Đây là loài bản địa đảo Macquarie, Nam Úc, Tây Úc, đảo Bắc và đảo Nam của New Zealand.[1] Dù quần thể ở Úc và New Zealand cho thấy những sự khác biệt duy truyền nhất định, hình thái của chúng rất giống nhau, và do đó được giữ thành một loài.[1]
Dù có ghi nhận con đực nặng tới 160 kg; cân nặng trung bình của chúng là 126 kg.[1][5] Hải cẩu đực có thể dài đến 2 mét. Con cái nặng chừng 30–50 kg, đạt chiều dài đến 1,5 mét. Con non mới sinh nặng 3,3–3,9 kg, dài 40-55 cm. Khi 290 ngày tuổi, con đực đạt chừng 14,1 kg, còn con cái đạt khoảng 12.6 kg.[1] Chúng có tai ngoài, và chân sau hướng lên trước.[3] Chúng có mũi nhọn, ria dài nhạt màu.[3] Chúng có hai lớp lông. Lớp lông loài màu nâu-xám ở mặt lưng, lợt màu hơn ở mặt bụng.[3] Nhiều con có lông dài chỏm bạc.[3]
Nhóm "Upland Seals" từng sống trên nhóm đảo Antipodes và đảo Macquarie có thể là một phân loài riêng biệt, với bộ lông dày hơn, dù không rõ liệu chúng có khác biệt đáng kể về di truyền không.[6]
Arctocephalus forsteri là một loài hải cẩu lông sống chủ yếu ở vùng duyên hải Tây và Nam Úc, New Zealand, và các đảo lân cận. Trong tiếng Māori, chúng mang tên kekeno.
Đây là loài bản địa đảo Macquarie, Nam Úc, Tây Úc, đảo Bắc và đảo Nam của New Zealand. Dù quần thể ở Úc và New Zealand cho thấy những sự khác biệt duy truyền nhất định, hình thái của chúng rất giống nhau, và do đó được giữ thành một loài.
Новозеландский морской котик[1] (лат. Arctocephalus forsteri) — вид ушастых тюленей из подсемейства морских котиков. Относится к роду южных морских котиков. Видовое название дано в честь немецкого учёного Георга Форстера (1754—1794)[2].
Окраска шерсти новозеландских морских котиков серо-коричневая. У самцов имеется чёрная грива. Их величина достигает 250 см, а вес 180 кг. Самки с размером 150 см и весом 70 кг намного меньше.
Новозеландский морской котик живёт сегодня преимущественно на побережье южного острова Новой Зеландии, а также на южном и западном побережье Австралии. Кроме того, его колонии встречаются на субантарктических островах Антиподов, на архипелаге Окленд, на островах Баунти, на архипелаге Чатем и на островах Кэмпбелл. Несколько сотен новозеландских морских котиков обитают на южном побережье Тасмании.
Вне брачного периода новозеландские морские котики путешествуют и встречаются также и в других местах. Прежде всего остров Маккуори круглый год полон молодыми самцами, которые ещё не в состоянии претендовать на собственную территорию. Некоторые заблудившиеся особи встречались и на берегах Новой Каледонии.
Крупные колонии на австралийских и тасманских побережьях были почти полностью уничтожены в конце XIX века. После этого охотники на тюленей продолжили свой промысел в Новой Зеландии, где все колонии были уничтожены до 1925. Лишь немногие животные избежали смерти, находясь в пещерах, недоступных для охотников. Сегодня численность новозеландских морских котиков составляет 60 тысяч особей и каждый год всё больше растёт. В новейшее время начали встречаться случаи основания колоний на северном острове Новой Зеландии. Это означает, что ареал котиков вновь расширяется.
Австралийская популяция оценивается в 35 тысяч животных. Здесь у новозеландского морского котика самые обширные территории распространения, однако отдельно взятые колонии не столь многочисленны, как в Новой Зеландии.
Новозеландский морской котик (лат. Arctocephalus forsteri) — вид ушастых тюленей из подсемейства морских котиков. Относится к роду южных морских котиков. Видовое название дано в честь немецкого учёного Георга Форстера (1754—1794).
新澳毛皮海狮（学名：Arctocephalus fosteri；毛利语：kekeno[2]；英语：New Zealand fur seal）是毛皮海狮属下的一种海狮，主要分布于澳大利亚南岸和新西兰南岛沿岸[1]。
雄性体重可达160千克，平均体重则为126千克[1][3]，体长可达2米。雌性体重在30-50千克之间，体长最多1.5米。[4]
这是一篇與哺乳动物相關的小作品。你可以通过编辑或修订扩充其内容。 新澳毛皮海狮（学名：Arctocephalus fosteri；毛利语：kekeno；英语：New Zealand fur seal）是毛皮海狮属下的一种海狮，主要分布于澳大利亚南岸和新西兰南岛沿岸。
뉴질랜드물개 또는 남방물개(Arctocephalus forsteri)는 남방물개속에 속하는 물개의 일종이다. 오스트레일리아 남부 해안과 뉴질랜드 남섬 해안 그리고 그 주변의 작은 섬들에서 발견된다.[1] 두 개체군이 약간의 유전적 차이를 보이고 있음에도 불구하고, 형태학적 모습은 아주 비슷하며 아직 하나의 종으로 분류되고 있다.[1]
수컷 몸무게는 최대 250kg까지 보고되고 있으며, 평균 약 126kg이다.[1][2] 수컷 몸길이는 최대 2m에 달한다. 암컷 몸무게는 평균 30~50kg이고, 몸길이는 최대 1.5m 정도이다. 새끼는 평균 몸무게 3.3~3.9kg에 몸길이 40~55cm이다. 생후 290일후 수컷 몸무게는 14.1kg, 암컷은 약 12.6kg이다.[1]
다음은 물개과의 계통 분류이다.[3]
물개과 북방물개속 큰바다사자속 바다사자속
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