Eared seal

Marine mammals in the family Otariidae

Eared seals
Temporal range: Miocene–Holocene,[1] 17.1–0 Ma
PreꞒ
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S
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An Australian sea lion (Neophoca cinerea)
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Carnivora
Clade: Pinnipedia
Clade: Panotariidae
Family: Otariidae
Gray, 1825
Type genus
Otaria
Péron, 1816
Genera

Arctocephalus
Callorhinus
Eotaria
Eumetopias
Neophoca
Otaria
Phocarctos
Pithanotaria
Proterozetes
Thalassoleon
Zalophus

An eared seal, otariid, or otary is any member of the marine mammal family Otariidae, one of three groupings of pinnipeds. They comprise 15 extant species in seven genera (another species became extinct in the 1950s) and are commonly known either as sea lions or fur seals, distinct from true seals (phocids) and the walrus (odobenids). Otariids are adapted to a semiaquatic lifestyle, feeding and migrating in the water, but breeding and resting on land or ice. They reside in subpolar, temperate, and equatorial waters throughout the Pacific and Southern Oceans, the southern Indian, and Atlantic Oceans. They are conspicuously absent in the north Atlantic.

The words "otariid" and "otary" come from the Greek otarion meaning "little ear",[2] referring to the small but visible external ear flaps (pinnae), which distinguishes them from the phocids.

Ear flaps of a South American sea lion (Otaria flavescens)

Evolution and taxonomy

Cladogram showing relationships among the otarids, combining several phylogenetic analyses. The fur seal tree is not fully resolved.[3]

Morphological and molecular evidence supports a monophyletic origin of pinnipeds, sharing a common ancestor with Musteloidea,[4][5] though an earlier hypothesis suggested that Otаriidae are descended from a common ancestor most closely related to modern bears.[6] Debate remains as to whether the phocids diverged from the otariids before or after the walrus.

Otariids arose in the Miocene (15–17 million years ago) in the North Pacific, diversifying rapidly into the Southern Hemisphere, where most species now live. The earliest known fossil otariid is Eotaria crypta from southern California,[1] while the genus Callorhinus (northern fur seal) has the oldest fossil record of any living otariid, extending to the middle Pliocene. It probably arose from the extinct fur seal genus Thalassoleon.

Traditionally, otariids had been subdivided into the fur seal (Arctocephalinae) and sea lion (Otariinae) subfamilies, with the major distinction between them being the presence of a thick underfur layer in the former. Under this categorization, the fur seals comprised two genera: Callorhinus in the North Pacific with a single representative, the northern fur seal (C. ursinus), and eight species in the Southern Hemisphere under the genus Arctocephalus; while the sea lions comprise five species under five genera.[7] Recent analyses of the genetic evidence suggests that Callorhinus ursinus is in fact more closely related to several sea lion species.[8] Furthermore, many of the Otariinae appear to be more phylogenetically distinct than previously assumed; for example, the Japanese sea lion (Zalophus japonicus) is now considered a separate species, rather than a subspecies of the California sea lion (Zalophus californius).

In light of this evidence, the subfamily separation has been removed entirely and the family Otariidae has been organized into seven genera with 16 species and two subspecies.[9][10] Nonetheless, because of morphological and behavioral similarities among the "fur seals" and "sea lions", these remain useful categories when discussing differences between groups of species. Compared to sea lions, fur seals are generally smaller, exhibit greater sexual dimorphism, eat smaller prey and go on longer foraging trips; and, of course, there is the contrast between the coarse short sea lion hair and the fur seal's fur.


Anatomy and appearance

California sea lions
Eared seal off the Namibian coast

Otariids have proportionately much larger foreflippers and pectoral muscles than phocids, and have the ability to turn their hind limbs forward and walk on all fours, making them far more maneuverable on land. They are generally considered to be less adapted to an aquatic lifestyle, since they breed primarily on land and haul out more frequently than true seals. However, they can attain higher bursts of speed and have greater maneuverability in the water. Their swimming power derives from the use of flippers more so than the sinuous whole-body movements typical of phocids and walruses.

Otariids are further distinguished by a more dog-like head, sharp, well-developed canines, and the aforementioned visible external pinnae. Their postcanine teeth are generally simple and conical in shape. The dental formula for eared seals is: 3.1.4.1-32.1.4.1. Sea lions are covered with coarse guard hairs, while fur seals have a thick underfur, which has historically made them the objects of commercial exploitation.

Male otariids range in size from the 70 kg (150 lb) Galápagos fur seal, smallest of all otariids, to the over 1,000-kg (2,200-lb) Steller sea lion. Mature male otariids weigh two to six times as much as females, with proportionately larger heads, necks, and chests, making them the most sexually dimorphic of all mammals.[11]

Behavior

All otariids breed on land during well-defined breeding seasons. Except for the Australian sea lion, which has an atypical 17.5 month breeding cycle, they form strictly annual aggregations on beaches or rocky substrates, often on islands. All species are polygynous; i.e. successful males breed with several females. In most species, males arrive at breeding sites first and establish and maintain territories through vocal and visual displays and occasional fighting. Females typically arrive on shore a day or so before giving birth. While considered social animals, no permanent hierarchies or statuses are established on the colonies. The extent to which males control females or territories varies between species. Thus, the northern fur seal and the South American sea lion tend to herd specific harem-associated females, occasionally injuring them, while the Steller sea lion and the New Zealand sea lion control spatial territories, but do not generally interfere with the movement of the females. Female New Zealand sea lions are the only otrariids that move up to 2 km (1.2 mi) into forests to protect their pups during the breeding season.[12][13][14][15]

Otariids are carnivorous, feeding on fish, squid and krill. Sea lions tend to feed closer to shore in upwelling zones, feeding on larger fish, while the smaller fur seals tend to take longer, offshore foraging trips and can subsist on large numbers of smaller prey items. They are visual feeders. Some females are capable of dives of up to 400 m (1,300 ft).

Species

Family Otariidae

Although the two subfamilies of otariids, the Otariinae (sea lions) and Arctocephalinae (fur seals), are still widely used, recent molecular studies have demonstrated that they may be invalid.[18][19] Instead, they suggest three clades within the family; one consisting of the northern sea lions (Eumetopias and Zalophus), one of the northern fur seal (Callorhinus) and its extinct relatives, and the third of all the remaining Southern Hemisphere species.[20]

References

  1. ^ a b Boessenecker, R. W.; Churchill, M. (2015). "The oldest known fur seal". Biology Letters. 11 (2): 20140835. doi:10.1098/rsbl.2014.0835. PMC 4360102. PMID 25672999.
  2. ^ "Otary, n., etymology of" The Oxford English Dictionary. 2nd ed. 1989. OED Online. Oxford University Press. http://dictionary.oed.com/ Archived 2006-06-25 at the Wayback Machine Accessed November 2007
  3. ^ Berta, Annalisa; Churchill, Morgan; Boessenecker, Robert W. (2018-05-30). "The Origin and Evolutionary Biology of Pinnipeds: Seals, Sea Lions, and Walruses". Annual Review of Earth and Planetary Sciences. 46 (1). Annual Reviews: 203–228. Bibcode:2018AREPS..46..203B. doi:10.1146/annurev-earth-082517-010009. ISSN 0084-6597. S2CID 135439365.
  4. ^ Hassanin, Alexandre; Veron, Géraldine; Ropiquet, Anne; Vuuren, Bettine Jansen van; Lécu, Alexis; Goodman, Steven M.; Haider, Jibran; Nguyen, Trung Thanh (2021-02-16). "Evolutionary history of Carnivora (Mammalia, Laurasiatheria) inferred from mitochondrial genomes". PLOS ONE. 16 (2): e0240770. Bibcode:2021PLoSO..1640770H. doi:10.1371/journal.pone.0240770. ISSN 1932-6203. PMC 7886153. PMID 33591975.
  5. ^ Berta, Annalisa (2009), "Pinniped Evolution", Encyclopedia of Marine Mammals, Elsevier, pp. 861–868, doi:10.1016/b978-0-12-373553-9.00199-1, ISBN 9780123735539, retrieved 2022-07-04
  6. ^ Lento, G.M.; Hickson, R.E.; Chambers, G.K.; Penny, D. (1 January 1995). "Use of spectral analysis to test hypotheses on the origin of pinnipeds". Molecular Biology and Evolution. 12 (1): 28–52. doi:10.1093/oxfordjournals.molbev.a040189. PMID 7877495.
  7. ^ J.E. King (1983). Seals of the World (2nd ed.). New York: Cornell University Press. ISBN 978-0-7022-1694-7.
  8. ^ Wynen, L; Goldsworthy, SD; Insley, SJ; Adams, M; Bickham, JW; Francis, J; Gallo, JP; Hoelzel, AR; et al. (2001). "Phylogenetic relationships within the eared seals (Otariidae: Carnivora): implications for the historical biogeography of the family". Mol. Phylogenet. Evol. 21 (2): 270–284. doi:10.1006/mpev.2001.1012. PMID 11697921.
  9. ^ Brunner, S. (2003). "Fur seals and sea lions (Otariidae): identification of species and taxonomic review". Systematics and Biodiversity. 1 (3): 339–439. doi:10.1017/S147720000300121X. S2CID 86375627.
  10. ^ "Otariidae". Integrated Taxonomic Information System.
  11. ^ Weckerly, FW (1998). "Sexual-size dimorphism: influence of mass and mating systems in the most dimorphic mammals". Journal of Mammalogy. 79 (1): 33–42. doi:10.2307/1382840. JSTOR 1382840.
  12. ^ Augé, Amélie; Chilvers; Moore; Mathieu; Robertson (2009-01-01). "Aggregation and dispersion of female New Zealand sea lions at the Sandy Bay breeding colony, Auckland Islands: How unusual is their spatial behaviour?". Behaviour. 146 (9): 1287–1311. doi:10.1163/15683909X427687. ISSN 0005-7959.
  13. ^ Augé, Amélie A.; Chilvers, B. Louise; Mathieu, Renaud; Moore, Antoni B. (2012). "On-land habitat preferences of female New Zealand sea lions at Sandy Bay, Auckland Islands". Marine Mammal Science. 28 (3): 620–637. Bibcode:2012MMamS..28..620A. doi:10.1111/j.1748-7692.2011.00515.x. ISSN 1748-7692.
  14. ^ Frans, Veronica F.; Augé, Amélie A.; Edelhoff, Hendrik; Erasmi, Stefan; Balkenhol, Niko; Engler, Jan O. (2018). "Quantifying apart what belongs together: A multi-state species distribution modelling framework for species using distinct habitats". Methods in Ecology and Evolution. 9 (1): 98–108. Bibcode:2018MEcEv...9...98F. doi:10.1111/2041-210X.12847. ISSN 2041-210X. S2CID 91050320.
  15. ^ Frans, Veronica F.; Augé, Amélie A.; Fyfe, Jim; Zhang, Yuqian; McNally, Nathan; Edelhoff, Hendrik; Balkenhol, Niko; Engler, Jan O. (2022). "Integrated SDM database: Enhancing the relevance and utility of species distribution models in conservation management". Methods in Ecology and Evolution. 13 (1): 243–261. Bibcode:2022MEcEv..13..243F. doi:10.1111/2041-210X.13736. ISSN 2041-210X. S2CID 243893898.
  16. ^ Lowry, L. (2017). "Zalophus japonicus". IUCN Red List of Threatened Species. 2017: e.T41667A113089431. doi:10.2305/IUCN.UK.2017-1.RLTS.T41667A113089431.en. Retrieved 13 November 2021.
  17. ^ (in Japanese) Zalophus californianus japonicus (CR), Red Data Book, Japan Integrated Biodiversity Information System, Ministry of the Environment (Japan). "The Japanese sea lion (Zalophus californianus japonicus) was common in the past around the coast of the Japanese Archipelago, but declined rapidly after the 1930s from overhunting and increased competition with commercial fisheries. The last record in Japan was a juvenile, captured in 1974 off the coast of Rebun Island, northern Hokkaido."
  18. ^ Yonezawa, T.; et al. (2009). "The monophyletic origin of sea lions and fur seals (Carnivora; Otariidae) in the Southern Hemisphere". Gene. 441 (1–2): 89–99. doi:10.1016/j.gene.2009.01.022. PMID 19254754.
  19. ^ Arnason, U.; et al. (2006). "Pinniped phylogeny and a new hypothesis for their origin and dispersal". Molecular Phylogenetics and Evolution. 41 (2): 345–354. doi:10.1016/j.ympev.2006.05.022. PMID 16815048.
  20. ^ Berta, A.; Churchill, M. (2012). "Pinniped Taxonomy: evidence for species and subspecies". Mammal Review. 42 (3): 207–234. doi:10.1111/j.1365-2907.2011.00193.x.

Further reading

  • Berta, A., and L. Sumich (1999) Marine Mammals: Evolutionary Biology. San Diego: Academic Press.
  • Gentry, R. L (1998) Behavior and Ecology of the Northern Fur Seal. Princeton: Princeton University Press.
  • Perrin, W. F., B. Würsig, and J. G. M. Thewissen (2002) Encyclopedia of Marine Mammals. San Diego: Academic Press.
  • Riedman, M. (1990) The Pinnipeds: Seals, Sea Lions and Walruses. Berkeley: University of California Press.

External links

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Otariidae
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and sea lions)

(Pinniped inclusive)
Arctocephalus
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Chrysocyon
  • Maned wolf (C. brachyurus)
Cuon
  • Dhole (C. alpinus)
Lupulella
  • Side-striped jackal (L. adustus)
  • Black-backed jackal (L. mesomelas)
Lycalopex
  • Culpeo (L. culpaeus)
  • Darwin's fox (L. fulvipes)
  • South American gray fox (L. griseus)
  • Pampas fox (L. gymnocercus)
  • Sechuran fox (L. sechurae)
  • Hoary fox (L. vetulus)
Lycaon
  • African wild dog (L. pictus)
Nyctereutes
  • Common raccoon dog (N. procyonoides)
  • Japanese raccoon dog (N. viverrinus)
Otocyon
  • Bat-eared fox (O. megalotis)
Speothos
  • Bush dog (S. venaticus)
Urocyon
  • Gray fox (U. cinereoargenteus)
  • Island fox (U. littoralis)
Vulpes
(Foxes)
  • Bengal fox (V. bengalensis)
  • Blanford's fox (V. cana)
  • Cape fox (V. chama)
  • Corsac fox (V. corsac)
  • Tibetan fox (V. ferrilata)
  • Arctic fox (V. lagopus)
  • Kit fox (V. macrotis)
  • Pale fox (V. pallida)
  • Rüppell's fox (V. rueppelli)
  • Swift fox (V. velox)
  • Red fox (V. vulpes)
  • Fennec fox (V. zerda)
Family Mustelidae
Helictidinae
(Ferret-badgers)
Melogale
  • Vietnam ferret-badger (M. cucphuongensis)
  • Bornean ferret badger (M. everetti)
  • Chinese ferret-badger (M. moschata)
  • Javan ferret-badger (M. orientalis)
  • Burmese ferret-badger (M. personata)
  • Formosan ferret-badger (M. subaurantiaca)
Guloninae
(Martens and wolverines)
Eira
  • Tayra (E. barbara)
Gulo
  • Wolverine (G. gulo)
Martes
(Martens)
  • American marten (M. americana)
  • Pacific marten (M. caurina)
  • Yellow-throated marten (M. flavigula)
  • Beech marten (M. foina)
  • Nilgiri marten (M. gwatkinsii)
  • European pine marten (M. martes)
  • Japanese marten (M. melampus)
  • Sable (M. zibellina)
Pekania
  • Fisher (P. pennanti)
Ictonychinae
(African polecats and grisons)
Galictis
  • Lesser grison (G. cuja)
  • Greater grison (G. vittata)
Ictonyx
  • Saharan striped polecat (I. libyca)
  • Striped polecat (I. striatus)
Lyncodon
  • Patagonian weasel (L. patagonicus)
Poecilogale
  • African striped weasel (P. albinucha)
Vormela
  • Marbled polecat (V. peregusna)
Lutrinae
(Otters)
Aonyx
  • African clawless otter (A. capensis)
  • Asian small-clawed otter (A. cinereus)
  • Congo clawless otter (A. congicus)
Enhydra
  • Sea otter (E. lutris)
Hydrictis
  • Spotted-necked otter (H. maculicollis)
Lontra
  • North American river otter (L. canadensis)
  • Marine otter (L. felina)
  • Neotropical otter (L. longicaudis)
  • Southern river otter (L. provocax)
Lutra
  • Eurasian otter (L. lutra)
  • Hairy-nosed otter (L. sumatrana)
Lutrogale
  • Smooth-coated otter (L. perspicillata)
Pteronura
  • Giant otter (P. brasiliensis)
Melinae
(Eurasian badgers)
Arctonyx
  • Northern hog badger (A. albogularis)
  • Greater hog badger (A. collaris)
  • Sumatran hog badger (A. hoevenii)
Meles
  • Japanese badger (M. anakuma)
  • Caucasian badger (M. canescens)
  • Asian badger (M. leucurus)
  • European badger (M. meles)
Mellivorinae
Mellivora
  • Honey badger (M. capensis)
Mustelinae
(Weasels and minks)
Mustela
(Weasels and ferrets)
  • Sichuan weasel (M. aistoodonnivalis)
  • Mountain weasel (M. altaica)
  • Stoat/Beringian ermine (M. erminea)
  • Steppe polecat (M. eversmannii)
  • Ferret (M. furo)
  • Haida ermine (M. haidarum)
  • Japanese weasel (M. itatsi)
  • Yellow-bellied weasel (M. kathiah)
  • European mink (M. lutreola)
  • Indonesian mountain weasel (M. lutreolina)
  • Black-footed ferret (M. nigripes)
  • Least weasel (M. nivalis)
  • Malayan weasel (M. nudipes)
  • European polecat (M. putorius)
  • American ermine (M. richardsonii)
  • Siberian weasel (M. sibirica)
  • Back-striped weasel (M. strigidorsa)
Neogale
  • Amazon weasel (N. africana)
  • Colombian weasel (N. felipei)
  • Long-tailed weasel (N. frenata)
  • American mink (N. vison)
Taxidiinae
Taxidea
  • American badger (T. taxus)
Taxon identifiers
Otariidae
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