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What Group Is the Sealion in Sea Lion Baby

Written By Friday, March 11, 2022 Add Comment Edit

Subfamily of aquatic mammals

Ocean panthera leo

Temporal range: Late Oligocene – Holocene
California sea lion in La Jolla (70568).jpg
California sea lion (Zalophus californianus)
Scientific nomenclature e
Kingdom: Animalia
Phylum: Chordata
Course: Mammalia
Order: Carnivora
Clade: Pinnipedia
Family: Otariidae
Subfamily: Otariinae
Gray 1825
Genera

Eumetopias
Neophoca
Otaria
Phocarctos
Zalophus

Sea lions are pinnipeds characterized past external ear flaps, long foreflippers, the power to walk on all fours, brusk, thick hair, and a big chest and belly. Together with the fur seals, they make upwards the family Otariidae, eared seals, which contains half-dozen extant and ane extinct species (the Japanese sea king of beasts) in five genera. Their range extends from the subarctic to tropical waters of the global ocean in both the Northern and Southern Hemispheres, with the notable exception of the northern Atlantic Ocean.[1] They have an average lifespan of xx–30 years. A male California bounding main panthera leo weighs on average about 300 kg (660 lb) and is about 2.four 1000 (8 ft) long, while the female bounding main lion weighs 100 kg (220 lb) and is 1.8 grand (6 ft) long. The largest sea panthera leo is Steller's sea lion, which tin weigh one,000 kg (2,200 lb) and abound to a length of three.0 m (x ft). Sea lions eat large quantities of food at a time and are known to eat almost 5–8% of their body weight (about 6.8–fifteen.9 kg (15–35 lb)) at a single feeding. Sea lions can move effectually 16 knots (thirty km/h; eighteen mph) in h2o and at their fastest they tin reach a speed of nearly 30 knots (56 km/h; 35 mph).[2] 3 species, the Australian sea lion, the Galápagos bounding main panthera leo and the New Zealand sea lion, are listed equally endangered.[3] [iv] [5]

Taxonomy [edit]

Body of water lions are related to walruses and seals. Together with the fur seals, they constitute the family Otariidae, collectively known as eared seals. Until recently, bounding main lions were grouped under a single subfamily called Otariinae, whereas fur seals were grouped in the subfamily Arcocephalinae. This partition was based on the nearly prominent common feature shared past the fur seals and absent in the body of water lions, namely the dense underfur feature of the former. Contempo genetic evidence, suggests Callorhinus, the genus of the northern fur seal, is more closely related to some sea lion species than to the other fur seal genus, Arctocephalus.[half dozen] Therefore, the fur seal/body of water lion subfamily distinction has been eliminated from many taxonomies.

Nonetheless, all fur seals have certain features in common: the fur, generally smaller sizes, farther and longer foraging trips, smaller and more abundant prey items, and greater sexual dimorphism. All sea lions accept certain features in common, in particular their coarse, short fur, greater bulk, and larger prey than fur seals. For these reasons, the distinction remains useful. The family Otariidae (Order Carnivora) contains the fourteen extant species of fur seals and sea lions. Traditional classification of the family into the subfamilies Arctocephalinae (fur seals) and Otariinae (bounding main lions) is not supported, with the fur seal Callorhinus ursinus having a basal relationship relative to the rest of the family.[7] This is consistent with the fossil tape which suggests that this genus diverged from the line leading to the remaining fur seals and body of water lions well-nigh 6 one thousand thousand years ago (mya). Similar genetic divergences between the sea lion clades too equally between the major Arctocephalus fur seal clades, suggest that these groups underwent periods of rapid radiation at about the time they diverged from each other. The phylogenetic relationships within the family and the genetic distances amid some taxa highlight inconsistencies in the current taxonomic classification of the family.[7]

Arctocephalus is characterized by bequeathed character states such equally dense underfur and the presence of double rooted cheek teeth and is thus idea to stand for the nigh "archaic" line. It was from this basal line that both the sea lions and the remaining fur seal genus, Callorhinus, are thought to take diverged. The fossil record from the western coast of North America presents evidence for the deviation of Callorhinus about 6 mya, whereas fossils in both California and Japan suggest that sea lions did not diverge until years afterwards.[7]

  • Suborder Caniformia
    • Family Otariidae
      • Subfamily Arctocephalinae
        • Genus Arctocephalus (southern fur seal; eight species)
        • Genus Callorhinus (northern fur seal; one species)
      • Subfamily Otariinae
        • Genus Eumetopias
          • Steller'south sea panthera leo, E. jubatus
        • Genus Neophoca
          • Australian sea king of beasts, North. cinerea
        • Genus Otaria
          • South American bounding main lion, O. flavescens
        • Genus Phocarctos
          • New Zealand sea lion or Hooker'due south sea king of beasts, P. hookeri
        • Genus Zalophus
          • California bounding main lion, Z. californianus
          • Japanese ocean king of beasts, Z. japonicus – extinct (1950s)
          • Galapagos sea lion, Z. wollebaeki
    • Family Phocidae: true seals
    • Family Odobenidae: walrus

Physiology [edit]

Diving adaptations [edit]

There are many components that make up sea lion physiology and these processes control aspects of their behavior. Physiology dictates thermoregulation, osmoregulation, reproduction, metabolic rate, and many other aspects on sea lion ecology including but not limited to their power to dive to neat depths. The sea lions' bodies command center rate, gas exchange, digestion rate, and blood flow to permit individuals to swoop for a long period of time and prevent side-effects of loftier force per unit area at depth.

The loftier pressures associated with deep dives cause gases such equally nitrogen to build up in tissues which are and then released upon surfacing, perhaps causing death. One of the ways bounding main lions deal with the farthermost pressures is past limiting the amount of gas substitution that occurs when diving. The bounding main lion allows the alveoli to be compressed by the increasing h2o pressure level thus forcing the surface air into cartilage lined airway just before the gas substitution surface.[8] This process prevents whatever further oxygen commutation to the blood for muscles, requiring all muscles to be loaded with enough oxygen to terminal the duration of the dive. Even so, this shunt reduces the amount of compressed gases from entering tissues therefore reducing the take chances of decompression sickness.[8] The collapse of alveoli does not let for whatsoever oxygen storage in the lungs withal. This means that body of water lions must mitigate oxygen use in order to extend their dives. Oxygen availability is prolonged by the physiological control of heart rate in the body of water lions. By reducing heart rate to well below surface rates, oxygen is saved past reducing gas exchange as well as reducing the energy required for a high centre rate.[9] Bradycardia is a control machinery to permit a switch from pulmonary oxygen to oxygen stored in the muscles which is needed when the sea lions are diving to depth.[nine] Another way bounding main lions mitigate the oxygen obtained at the surface in dives is to reduce digestion charge per unit. Digestion requires metabolic activeness and therefore free energy and oxygen are consumed during this process; however, sea lions tin limit digestion charge per unit and decrease it by at least 54%.[x] This reduction in digestion results in a proportional reduction in oxygen use in the breadbasket and therefore a correlated oxygen supply for diving. Digestion rate in these bounding main lions increases back to normal rates immediately upon resurfacing.[ten] Oxygen depletion limits dive elapsing, but carbon dioxide (COtwo) build up besides plays a function in the dive capabilities of many marine mammals. Afterward a body of water lion returns from a long swoop, CO2 is not expired as fast as oxygen is replenished in the blood, due to the unloading complications with CO2. However, having more than than normal levels of CO2 in the blood does non seem to adversely touch on dive behavior.[11] Compared to terrestrial mammals, ocean lions have a college tolerance to storing CO2 which is what normally tells mammals that they need to exhale.[xi] This ability to ignore a response to COii is likely brought on by increment carotid bodies which are sensor for oxygen levels which let the animal know its available oxygen supply.[xi] Yet, the bounding main lions cannot avoid the effects of gradual COii build up which eventually causes the bounding main lions to spend more time at the surface after multiple repeated dives to allow for enough built up CO2 to be expired.[11]

Parasites and diseases [edit]

Behavioural and ecology correlates of Philophthalmus zalophi, a foot parasite. And the infection has impacted the survival of juvenile Galapagos sea lions (Zalophus wollebaeki).[12] This infection leads to diseases that are connected to global warming. The number of infectious stages of unlike parasites species has a potent correlation with temperature change, therefore information technology is essential to consider the correlation betwixt the increasing number of parasitic infections and climate changes. To test this proposed theory researchers used Galapagos bounding main lions considering they are owned to the Galapagos islands.[12] The Galapagos Islands goes through seasonal changes in bounding main surface temperatures, which consist of loftier temperatures from the beginning of January through the calendar month of May and lower temperatures throughout the remainder of the year. Parasites surfaced in large numbers when the sea temperature was at its highest. Furthermore, data was collected past capturing sea lions in order to measure and determine their growth rates. Their growth rates were noted along with the citings of parasites which were institute under the eyelid. The shocking results were that bounding main lions are affected the parasites from the early ages of 3 weeks old up until the age of iv to viii months.[12] The parasites plant in the eye fluke did serious impairment to the center. From the data collected, 21 of the 91 survived; with a full of lxx deaths in just a bridge of two years.[12] The parasites are attacking the pups at such young ages; thus causing the pups to not reach the age of reproduction. The death rates of the pups is surpassing the fertility rate past far. Since nearly pups are unable to reach the historic period of reproduction, the population is not growing fast enough to go on the species out of endangerment. The pups who do survive must pass their stiff genes down to make sure their immature survive and the generation that follows. Other parasites, like Anisakis and heartworm can as well infect ocean lions.

Along with Galapagos islands, ocean lions (Zalophus wollebaeki) being affected are the Australian sea lions (Neophoca cinerea).[xiii] The same method was used for the sea pups on the galapagos island, but in addition, the researchers in Australia took claret samples. The pups in Australia were beingness affected by hookworms, but they were likewise coming out in large numbers with warmer temperatures.[xiii] New Zealand body of water king of beasts pups (Phocarctos hookeri) were also affected in really early ages by hookworms (Uncinaria). The difference is that in New Zealand researchers took the necessary steps and began treatment.[14] The treatment seemed to be effective on the pups who accept taken it. They constitute no traces of this infection afterwards. However, the percentage of pups who do have it is notwithstanding relatively high at about 75%.[fourteen] Those pups who were treated had much amend growth rates than those who did not. Overall parasites and hookworms are killing off plenty pups to identify them in endangerment. Parasites touch on sea pups in various areas of the world. Reproductive success reduces immensely, survival methods, changes in health and growth have also been affected.

Similarly, climate modify has resulted in increased toxic algae blooms in the oceans. These toxins are ingested by sardines and other fish which are and so eaten by the sea lions, causing neurological damage and diseases such as epilepsy.[xv]

Gene expressions and diet [edit]

Cistron expressions are being used more frequently to detect the physiological responses to nutrition, also every bit other stressors. In a written report done with iv Steller sea lions (Eumetopias jubatus), three of the four sea lions underwent a 70-day trial which consisted of unrestricted food intake, acute nutritional stress, and chronic nutritional stress. Results showed that individuals under nutritional stress downwards-regulated some cellular processes inside their immune response and oxidative stress. Nutritional stress was considered the well-nigh proximate cause of population refuse in this species.[sixteen] In New Zealand sea lions, n-to south gradients driven past temperature differences were shown to exist key factors in the prey mix.[17]

Geographic variation [edit]

Geographic variation for bounding main lions have been adamant past the observations of skulls of several Otariidae species; a general change in size corresponds with a change in latitude and principal productivity. Skulls of Australian sea lions from Western Australia were generally smaller in length whereas the largest skulls are from cool temperate localities. Otariidae are in the procedure of species departure, much of which may be driven by local factors, specially latitude and resource.[18] Populations of a given species tend to be smaller in the torrid zone, increment in size with increasing latitude, and reach a maximum in sub-polar regions. In a cool climate and cold waters there should be a selective reward in the relative reduction of body expanse resulting from increased size, since the metabolic rate is related more closely to body surface area than to body weight.[eighteen]

Convenance and population [edit]

Breeding methods and habits [edit]

Two sea lions on the beach of Otago Peninsula, New Zealand

Sea lions, with three groups of pinnipeds, have multiple breeding methods and habits over their families simply they remain relatively universal. Otariids, or eared sea lions, raise their young, mate, and rest in more than earthly state or water ice habitats. Their abundance and haul-out behavior accept a direct effect on their on state breeding activity. Their seasonal affluence trend correlates with their breeding period between the austral summer of Jan to March. Their rookeries populate with newborn pups as well equally male and female otariids that remain to defend their territories. At the end of the breeding flow males disseminate for food and rest while females remain for nurturing. Other points in the year consist of a mix of ages and genders in the rookeries with haul-out patterns varying monthly.[19]

Steller sea lions, living an boilerplate of 15 to xx years, begin their breeding flavor when adult males found territories along the rookeries in early May. Male ocean lions accomplish sexual maturity from ages 5 to 7 and don't become territorial until around nine to 13 years of age. The females arrive in late May bringing in an increase of territorial defense through fighting and boundary displays. After a week births consist nigh usually of one pup with a perinatal menstruum of 3 to 13 days.

Steller sea lions have exhibited multiple competitive strategies for reproductive success. Sea lion mating is oftentimes polygamous as males usually mate with different females to increase fitness and success, leaving some males to not find a mate at all. Polygamous males rarely provide parental care towards the pup. Strategies used to monopolize females include the resource-defense polygyny, or occupying of import female person resource. This involves occupying and defending a territory with resources or features attractive to females during sexually receptive periods. Some of these factors may include pupping habitat and access to water. Other techniques include potentially limiting access of other males to females.[20]

Population [edit]

Otaria flavescens (South American sea lion) lives along the Chilean coast with a population estimate of 165,000. According to the almost recent surveys in northern and southern Chile the sealing catamenia of the middle twentieth century that left a pregnant decline in ocean lion population is recovering. The recovery is associated with less hunting, otariids rapid population growth, legislation on nature reserves, and new food resources. Haul-out patterns change the abundance of ocean lions at particular times of the 24-hour interval, calendar month, and year. Patterns in migration relate to temperature, solar radiations, and casualty and water resources. Studies of South American sea lions and other otariids document maximum population on country during early on afternoon, potentially due to haul-out during loftier air temperatures. Adult and subadult males do not show clear almanac patterns, maximum affluence being found from October to January. Females and their pups hauled-out during austral winter months of June to September.[21]

Interactions with humans [edit]

South American sea lions have been greatly impacted by human being exploitation. During the late Holocene menstruation to the middle of the twentieth century, hunter-gatherers forth the Beagle Aqueduct and northern Patagonia had profoundly reduced the number of sea lions due to their hunting of the species and exploitation of the species' environment.[22] Although sealing has been put to a halt in many countries, such every bit Uruguay, the body of water panthera leo population continues to decline because of the drastic furnishings humans have on their ecosystems.[22] As a result, South American sea lions have been foraging at higher tropical latitudes than they did prior to human being exploitation.[22] Fishermen play a key role in the endangerment of body of water lions. Ocean lions rely on fish, like pollock, as a food source and have to compete with fishermen for it.[23] When fishermen are successful at their job, they greatly reduce the sea panthera leo's food source, which in turn endangers the species.[23] Also, human presence and human recreational activities can cause sea lions to engage in violent and aggressive deportment.[24] When humans come closer than 15 meters of a body of water lion, the ocean lions' vigilance increases because of the disturbance of humans.[24] These disturbances can potentially crusade sea lions to accept psychological stress responses that cause the sea lions to retreat, sometimes even carelessness their locations, and decreases the corporeality of fourth dimension body of water lions spend hauling out.[24]

New Zealand bounding main lions were too exploited from hunting and sealing, and as a result were extirpated from New Zealand's mainland for over 150 years, with their population being restricted to the subantarctic.[25] In 1993, a female person New Zealand sea panthera leo gave nascency on the mainland for the first time, and since then, they have slowly been recolonizing.[25] These sea lions are the only pinnipeds that regularly motility upwards to 2 kilometres (1.2 mi) inland into forests.[26] [27] [28] As event, they take been hit by cars on roads, deliberately killed, and been disturbed by dogs.[29] Females demand to move inland every bit a style to protect their pups, so roads, fences, residential areas, and private lands can inhibit their dispersal and convenance success.[xxx] They have also adapted to commercial pine forests,[thirty] and have given nativity or nursed pups in residents' backyards and on golf courses.[31] Every bit ane of the earth's rarest bounding main lions, and an endangered and owned species, efforts are being made to facilitate coexistence betwixt them and humans.[32] [33]

Sea lion attacks on humans are rare, but when humans come within approximately 2.5 meters (8 ft), it can be very unsafe.[24] In a highly unusual attack in 2007 in Western Australia, a sea panthera leo leapt from the water and seriously mauled a thirteen-twelvemonth-onetime girl surfing behind a speedboat. The sea lion appeared to be preparing for a 2d attack when the girl was rescued. An Australian marine biologist suggested that the sea lion may have viewed the daughter "like a rag doll toy" to be played with.[34] [35] [36] In San Francisco, where an increasingly large population of California ocean lions crowds docks forth San Francisco Bay, incidents have been reported in recent years of swimmers' existence bitten on the legs by large, ambitious males, possibly as territorial acts.[37] [38] In Apr 2015, a body of water lion attacked a 62-yr-old human who was boating with his wife in San Diego. The attack left the man with a punctured bone.[39] In May 2017, a body of water lion grabbed and pulled a girl into the water by her dress before retreating. The kid was sitting on a pier side in British Columbia while tourists were illegally feeding the sea lions when the incident took place.[40] She was pulled out of the water with minor injuries and received antibiotic prophylactic treatment for seal finger infection from the superficial bite injury.[41] [42]

Sea lions have also been a focus of tourism in Australia and New Zealand.[24] Ane of the main sites to view sea lions is in the Carnac Island Nature Reserve near Perth in Western Australia. This tourist site receives over 100,000 visitors, many of whom are recreational boaters and tourists, who tin watch the male sea lions haul out on to the shore.[24] They have sometimes been chosen "the unofficial welcoming committee of the Galápagos Islands".[43]

Gallery [edit]

Sea lions at Moss Landing, California GiGi, a sea lion trained by the U.S. Navy for underwater recovery, nuzzles merchant mariner Capt. Arne Willehag of the USNS Sioux during a 1983 training session. Sea lion head.jpg Sea Lion Lounging.JPG
A gathering of more than than 40 sea lions off the coast of California A armed services body of water panthera leo on board a U.S. Navy ship A bounding main lion at the Memphis Zoo A sea lion pup sleeping at Pantai Inn
Sea lion head by the ocean.jpg Sealion052006.JPG Sea lion chillin'.jpg Sea lions chillin'.jpg
A bounding main panthera leo in Malibu, California Bounding main King of beasts at Monterey Breakwater A sea lion sleeps in the Ballestas Islands, Peru A group of body of water lions rest in the Ballestas Islands, Republic of peru

Run into also [edit]

  • California ocean lion
  • Marine mammal
  • List of carnivorans by population
  • Otariids
  • Phocids
  • Pinniped

References [edit]

  1. ^ "California Ocean King of beasts – SeaWorld Info Book". SeaWorld. Archived from the original on 14 Apr 2015. Retrieved 26 December 2013.
  2. ^ Riedman, Marianne (thirteen December 1989). The Pinnipeds: Seals, Sea lions, and Walruses . Academy of California Press. p. 7. ISBN9780520064973.
  3. ^ Chilvers, B. L. (2015). "Phocarctos hookeri. The IUCN Scarlet Listing of Threatened Species". International Union for Conservation of Nature and Natural Resources. doi:10.2305/IUCN.UK.2015-two.RLTS.T17026A1306343.en.
  4. ^ Trillmich, F. (2015). "Arctocephalus galapagoensis. The IUCN Reddish List of Threatened Species". International Union for Conservation of Nature and Natural Resource. doi:ten.2305/IUCN.UK.2015-2.RLTS.T2057A45223722.en.
  5. ^ Goldsworthy, Southward. D. (2015). "Neophoca cinerea. The IUCN Cherry-red List of Threatened Species". International Union for Conservation of Nature and Natural Resources. doi:x.2305/IUCN.UK.2015-2.RLTS.T14549A45228341.en.
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  7. ^ a b c Wynen, Louise P.; Goldsworthy, Simon D.; Insley, Stephen J.; Adams, Mark; Bickham, John W.; Francis, John; Gallo, Juan Pablo; Hoelzel, A. Rus; Majluf, Patricia (1 November 2001). "Phylogenetic Relationships within the Eared Seals (Otariidae: Carnivora): Implications for the Historical Biogeography of the Family". Molecular Phylogenetics and Evolution. 21 (2): 270–284. doi:10.1006/mpev.2001.1012. PMID 11697921.
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  33. ^ "'Cheeky' sea lions are returning to New Zealand's shores — and locals are learning to share the coast". Washington Post. ISSN 0190-8286. Retrieved 22 November 2021.
  34. ^ Sea lion attacks Australian girl. BBC News (15 Apr 2007). Retrieved on 2016-05-09.
  35. ^ Hayward, Andrea (xv Apr 2007) Monster sea lion likely to exist 'playing' with teen. news.com.au
  36. ^ Ocean lion mauls girl. News.com.au (15 Apr 2007).
  37. ^ Kay, Jane (24 June 2011). "Rogue bounding main panthera leo in S.F. menaces swimmers / Marauding mammal bites at least 14, chases 10 from Aquatic Park Lagoon". The San Francisco Chronicle.
  38. ^ Harrell, Ashley (7 October 2009). "Besides Beautiful to Shoot? – Page one – News – San Francisco". SF Weekly . Retrieved 28 June 2012.
  39. ^ "Bounding main lion attacks San Diego man posing for photo, yanks him overboard". world wide web.cbsnews.com. 30 April 2015.
  40. ^ "Video shows the terrifying moment a ocean panthera leo yanks a daughter into the water". Washington Mail service . Retrieved 22 May 2017.
  41. ^ "Steveston Ocean Lion Video: Girl Grabbed By Animal Treated For Superficial Wound". HuffPost Canada. 23 May 2017. Retrieved twenty September 2018.
  42. ^ "Sea panthera leo set on: Girl treated over 'seal finger' risk". BBC News. 26 May 2017. Retrieved 26 May 2017.
  43. ^ "In the Galapagos Islands they're so ubiquitous that they run the risk of being taken for granted. Here, y'all can find this unofficial welcoming committee nearly everywhere"

Further reading [edit]

  • Healy, Jack (March 2015). Starving Sea Lions Washing Ashore past the Hundreds in California. The New York Times

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Source: https://en.wikipedia.org/wiki/Sea_lion

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