Editing Phoca

{{Short description|Genus of carnivores}}
{{Automatic taxobox
| image = common seal.jpg
| taxon = Phoca
| authority = [[Carl Linnaeus|Linnaeus]], [[10th edition of Systema Naturae|1758]]
| type_species = ''[[Phoca vitulina]]''
| type_species_authority = [[Linnaeus]], 1758
| subdivision_ranks = Species
| subdivision = *''P. largha''
*''P. vitulina''
*''P. mutica''?
}} 

'''''Phoca''''' ({{IPAc-en|"|f|oU|k|@}} {{respell|FOH|kə}})<ref>{{Cite book|title=The Chambers Dictionary|publisher=Chambers|year=2003|isbn=0-550-10105-5|edition=9th|chapter=Phoca}}</ref> is a genus of the [[earless seal]]s, within the [[Phocidae|family Phocidae]]. It now contains just two species, the [[common seal]] (or harbour seal) and the [[spotted seal]] (or largha seal). Several species formerly listed under this genus have been split into the genera ''[[Pusa]]'', ''[[harp seal|Pagophilus]]'', and ''[[ribbon seal|Histriophoca]]''. Until recently, ''Phoca largha'' has been considered a subspecies of ''Phoca vitulina'' but now is considered its own species. For this reason, the fossil history of the genus is unclear, and it has formerly been used as [[wastebasket taxon]] for a number of fossils of uncertain affinity.<ref name=Berta2012>{{cite journal |author1=Berta, A.  |author2=Churchill, M.  |name-list-style=amp |year=2012 |title=Pinniped Taxonomy: evidence for species and subspecies |journal=Mammal Review |volume=42 |issue=3 |pages=207–234 |doi=10.1111/j.1365-2907.2011.00193.x}}</ref>

==Species==
Currently there are two confirmed members:
{|class="wikitable"
|-
! Image !! Scientific name !! Common Name !! Distribution
|-
|[[File:Phoca largha Bering Sea 2.jpg|120px]] ||''Phoca largha'' ||[[spotted seal]] ||Beaufort, Chukchi, Bering and Okhotsk Seas
|-
|[[File:Seehund2cele4.jpg|120px]] ||''Phoca vitulina''  ||[[common seal]] ||northern Atlantic and Pacific Oceans and the Baltic and North Seas
|-
|}

There is also a third unconfirmed member:
{|class="wikitable"
|-
! Image !! Scientific name !! Common Name !! Distribution
|-
|[[File:Long-necked seal.jpg|120px]] ||''Phoca mutica'' ||[[long-necked seal]] ||unknown
|-
|}

Former members of ''Phoca'':
* ''Histriophoca fasciata'' ([[ribbon seal]])
* ''Pusa caspica'' ([[Caspian seal]])
* ''Pusa hispida'' ([[ringed seal]])
* ''Pusa sibirica'' (nerpa or [[Baikal seal]])
* ''Pagophilus groenlandica'' ([[harp seal]])

==Mating ecology==
[[File:Harbour seal breast feeding 1150144.jpg|right|thumb|260x260px|Harbour seal breastfeeding a pup. Shortly after weaning mating will occur.]]

Both harbour and spotted seals are aquatically mating [[pinniped]]s.<ref name=":0"/> Mating occurs in the water around the time when pups are weaned.<ref name=":1">{{Cite journal|last=Sullivan|first=R. M.|date=1981|title=Aquatic Displays and Interactions in Harbor Seals, Phoca vitulina, with Comments on Mating Systems|journal=Journal of Mammalogy|volume=62|issue=4|pages=825–831|doi=10.2307/1380606|jstor=1380606}}</ref> Females in [[Estrous cycle|estrus]] are typically more dispersed than land-breeding pinnipeds and the distinction between foraging and reproductive behavior is less apparent.<ref>{{cite journal | last1 = Van Parijs | first1 = S. M. | last2 = Hastie | first2 = G. D. | last3 = Thompson | first3 = P. M. | year = 1999 | title = Geographical variation in temporal and spatial vocalization patterns of male harbour seals in the mating season | journal = Animal Behaviour | volume = 58 | issue = 6 | pages = 1231–1239 | doi = 10.1006/anbe.1999.1258 | pmid = 10600144 }}</ref> For this reason, it is difficult to study the mating patterns of this genus.<ref name=":2">{{Cite journal|last1=Hayes|first1=Sean A.|last2=Costa|first2=Daniel P.|last3=Harvey|first3=James T.|last4=Boeuf|first4=BURNEY J.|title=Aquatic Mating Strategies of the Male Pacific Harbor Seal (Phoca Vitulina Richardii): Are Males Defending the Hotspot?|date=2004-07-01|journal=Marine Mammal Science|language=en|volume=20|issue=3|pages=639–656|doi=10.1111/j.1748-7692.2004.tb01184.x|bibcode=2004MMamS..20..639H |issn=1748-7692}}</ref>

Female harbour seals start making foraging trips shortly before weaning their pup and consequently are widely dispersed when in estrus.<ref name=":3">{{cite journal | last1 = van Parijs | first1 = S. M. | last2 = Thompson | first2 = P. M. | last3 = Tollit | first3 = D. J. | last4 = Mackay | first4 = A. | year = 1997 | title = Distribution and activity of male harbor seals during the mating season | journal = Animal Behaviour | volume = 54 | issue = 1 | pages = 35–43 | doi = 10.1006/anbe.1996.0426 | pmid = 9268433 }}</ref> Males restrict their range around the time females start to make these foraging trips.<ref name=":4">{{cite journal | last1 = van Parijs | first1 = S. M. | last2 = Janik | first2 = V. M. | last3 = Thompson | first3 = P. M. | year = 2000 | title = Display-area size, tenure length, and site fidelity in the aquatically mating male harbour seal, ''Phoca vitulina''| journal = Canadian Journal of Zoology| volume = 78 | issue = 12 | pages = 2209–2217 | doi = 10.1139/cjz-78-12-2209 }}</ref> Harbour seals follow a [[Polygynous animal mating|polygynous]] mating system.<ref>{{cite journal | last1 = Coltman | first1 = D. W. | last2 = Bowen | first2 = W. D. | last3 = Wright | first3 = J. M. | year = 1998 | title = Male mating success in an aquatically mating pinniped, the harbour seal (''Phocu vitulina''), assessed by micro- satellite DNA markers | journal = Molecular Ecology | volume = 7 | issue = 5 | pages = 627–638 | doi = 10.1046/j.1365-294x.1998.00373.x | pmid = 9633104 | bibcode = 1998MolEc...7..627C }}</ref>  More specifically it has been shown that male harbour seals partake in [[Lek mating|lek polygyny]]. Male seals defend underwater territories with well-defined boundaries.<ref name=":1" /><ref>{{cite journal | last1 = Hanggi | first1 = E. B. | last2 = Schusterman | first2 = R. J. | year = 1994 | title = Underwater acoustic displays and individual variation in male harbour seals, ''Phoca vitulina'' | journal = Animal Behaviour | volume = 48 | issue = 6 | pages = 1275–1283 | doi = 10.1006/anbe.1994.1363 }}</ref> The most valuable territories are near [[Hauling-out|haulouts]] or along traffic corridors that provide maximum exposure to estrous females.<ref name=":3" /> One male will occupy an area throughout the breeding season, and they will return to the same display area in consecutive years.<ref name=":4" /> Female harbour seals receive direct benefits from being in a lek, as the congregation of males into an area makes [[mate selection]] easier because females do not have to travel as far and it also helps to reduce exposure to predators.

[[File:Noaa-seal7.jpg|thumb|257x257px|Spotted seal triad during the breeding season: [[lanugo]]-clad pup (left), mother (center), and attending male (right in water).]]
Harbour seal males use underwater vocalizations and display dives within their aquatic territories, for both [[Sexual selection|female attraction and male-male competition]].<ref name=":5">{{Cite journal|last1=Van Parijs|first1=Sofie M|last2=Kovacs|first2=Kit M|date=2002-07-01|title= In-air and underwater vocalizations of eastern Canadian harbour seals, Phoca vitulina|journal= Canadian Journal of Zoology|volume=80|issue=7|pages=1173–1179|doi=10.1139/z02-088|issn=0008-4301}}</ref><ref name=":3" /><ref name=":2" /> Male harbour seal vocalizations consist of low-frequency broadband growls that peak in occurrence during the mating season.<ref name=":2" />  Males vocalize and display in small, distinct territories covering around 40–135 m<sup>2</sup>.<ref name=":4" /> Each display area is spatially discrete and can be separated by up to 250 meters.<ref name=":4" /> Male harbour seals have considerable individual and geographic variation in their underwater vocalizations.<ref name=":5" /> Territory holders use the acoustic displays of intruders to locate and challenge invaders and will respond aggressively to a male call.<ref name=":6">{{Cite journal|last1=Hayes|first1=Sean A.|last2=Kumar|first2=Anurag|last3=Costa|first3=Daniel P.|last4=Mellinger|first4=David K.|last5=Harvey|first5=James T.|last6=Southall|first6=Brandon L.|last7=Boeuf|first7=Burney J. Le|title=Evaluating the function of the male harbour seal, Phoca vitulina , roar through playback experiments|journal=Animal Behaviour|volume=67|issue=6|pages=1133–1139|doi=10.1016/j.anbehav.2003.06.019|year=2004}}</ref> Males assess each other by their vocalizations before deciding whether to respond.<ref name=":7">Nicholson, T. E. (2000). Social structure and underwater behavior of harbor seals in southern Monterey Bay, California. M.S. thesis, San Francisco State University.</ref> These vocalizations are energetically expensive to produce and are honest signals of male quality and dominance. Male body condition will decline as the mating season progresses.<ref name=":2" />

Aquatic hierarchies in harbour seals develop before the breeding season and dominance is determined by direct male contests. These contests involve repeated confrontations between two males using surface splashing, fighting, paired somersaulting, and chasing techniques.<ref name=":6" /> The hierarchies may aid in holding territories or to [[mating|mate]] with females during the breeding season. The dominance relationships are determined by size and sex, with adult males dominant to sub-adult males, and sub-adult females submissive to all other social classes.<ref>{{cite journal | last1 = Sullivan | first1 = R. M. | year = 1982 | title = Agonistic behavior and dominance relationships in the harbor seal, ''Phoca vitulina'' | journal = Journal of Mammalogy | volume = 63 | issue = 4 | pages = 554–569 | doi = 10.2307/1380260 | jstor = 1380260 }}</ref> Aquatic courtship is long in duration and involves rolling, bubble blowing, and splashing to attract females.<ref name=":7" /><ref name=":1" /> Female choice appears to play a strong role in this [[mating system]] but it has yet to be formally studied.<ref name=":6" />

The mating system of spotted seals is quite different from harbour seals as spotted seals are [[Monogamy#Serial monogamy|serially monogamous.]]<ref>{{cite journal | last1 = Beier | first1 = J. C. | last2 = Wartzok | first2 = D. | year = 1979 | title = Mating behavior of captive spotted seals (''Phoca largha'') | journal = Animal Behaviour | volume = 27 | pages = 772–781 | doi = 10.1016/0003-3472(79)90013-7 }}</ref> During the [[breeding season]], a male will join a female approximately ten days before the female gives birth to a pup from the previous years mating.<ref name=":0">{{Cite book|doi=10.1016/B978-0-12-373553-9.00126-7|chapter=Harbor Seal and Spotted Seal|title=Encyclopedia of Marine Mammals|year=2009|last1=Burns|first1=John J.|pages=533–542|isbn=9780123735539}}</ref> The pairs are considered to be territorial as they keep widely spaced from other spotted seals.<ref>{{cite journal | last1 = Burns | first1 = J. J. | last2 = Ray | first2 = G. C. | last3 = Fay | first3 = F. H. | last4 = Shaughnessy | first4 = P. D. | year = 1972 | title = Adoption of a strange pup by the ice-inhabiting harbour seal, ''Phoca vitulina largha'' | journal = Journal of Mammalogy | volume = 53 | issue = 3 | pages = 594–598 | doi = 10.2307/1379048 | jstor = 1379048 }}</ref> The social group consists of an isolated adult pair and the females pup.<ref name=":0" /> The female spotted seal receives direct benefits from the male as he provides protection for her and the pup until it is weaned. Immediately after weaning mating occurs.<ref name=":0" />

==References==
{{Commons category|Phoca}}
{{Wikispecies|Phoca}}
{{Reflist}}

{{Carnivora|C1.}}
{{Pan-Pinnipedia|P.|state=autocollapse}}
{{Taxonbar|from=Q878742}}
{{Authority control}}

[[Category:Phocins]]
[[Category:Carnivoran genera]]
[[Category:Taxa named by Carl Linnaeus]]