Sea mink

Sea mink
Temporal range: Late Pleistocene to Holocene
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Carnivora
Family: Mustelidae
Subfamily: Mustelinae
Genus: Neovison
Species: †N. macrodon
Binomial name
†Neovison macrodon
(Prentiss, 1903)
Synonyms
  • Lutreola macrodon
  • Mustela macrodon
  • Lutreola vison antiquus Loomis, 1911
  • Mustela vison macrodon
  • Neovison vison macrodon

The sea mink (Neovison macrodon) is an extinct North American member of the family Mustelidae. It is the only mustelid, and one of only two terrestrial mammal species in the order Carnivora, to become extinct in historic times (the other being the Falkland Islands wolf). The body of the sea mink was significantly longer than that of the closely related American mink (N. vison), and also bulkier, leading to a pelt that was almost twice the size of the other species. The longest specimen recorded was said to be 82.6 cm (32.5 in). The sea mink produced a distinctive odor, and had fur that was said to be coarser and redder than the American mink's.[2]

Appearance

The sea mink was hunted to extinction before scientists had an opportunity to analyze them. Its relatives give a general idea of what this semiaquatic weasel looked like. Accounts from locals to the New England/Atlantic Canadian regions say that the sea mink had a fatter body than that of the American mink. Furthermore, it had reddish fur, and its tail was slightly bushy. This larger body and fur made it very profitable and desirable to fur trappers.[3]

Diet

Similar to the European mink and the American mink, the sea mink’s diet consisted of seabirds, most likely the Labrador duck, seabird eggs, hard-bodied marine invertebrates, and in some cases insects. Since the sea mink was larger than the other two species of Mustelidae it is assumed that it ate in greater proportions.[4]

Skeletal structure

The sea mink was the largest of the minks. Its skull had a wide rostrum, large opening of anterior nares, large antorbital foramina, and very large teeth. This species skull was easily distinguishable from the other species of vison, American mink, because of its large size and bigger teeth. Fur buyers and traders recognized the sea mink because of its larger size compared to other minks and eventually the species was exterminated by the interest in their fur.[5]

Many skeletal remains of this mink have been found off the New England coast. The sea mink served as food for the Native American tribes that once lived there. These minks are described as large and heavily built, with a low sagittal crest and short, wide postorbital processes. Fragmentary skeletal remains of the sea mink leave most of its external measurements to speculation.[6]

Behavior

The sea mink was characterized by its solitary, territorial nature. Males were known to be particularly aggressive towards each other, marking territories with specific scents along a shoreline. In the event of trespassing, violent confrontations would occur. At the same time, males and females both lived promiscuous lifestyles, oftentimes mating with multiple partners especially during late spring, April to May timeframe.[7]

The litter of pups, usually blind and helpless, were supported by the mother for a period of 13–14 weeks. However, many external threats affected the development of the baby pups, and high mortality rates were not uncommon.[7]

Habitat

Sea minks were semiaquatic animals that lived around the rocky coasts of New England and Atlantic Canada, as far north as Nova Scotia in rocky areas along the coastal lines. They inhabited the shores of New England and the Canadian Maritime Provinces until hunted to extinction in the 19th century. They were not a truly marine species, being confined to coastal waters. They also habituated near Casco Bay, Maine, in the south to as far north as Newfoundland, Canada. The Labrador duck, with which it coexisted, may have been a prey item.[4]

The sea mink was the most aquatic member of Musteloidea except for the otters, and it was unusual in having rapidly evolved toward a marine habitat in the late Cenozoic. The sea mink family was originally from coastal Eastern North America, from Massachusetts to the Maritime Provinces. It had a more slender body than the American mink. It preferred coastal habitats, particularly rocky coasts and offshore islands.[8][4]

Extinction

The sea mink was hunted to extinction to satisfy the demand of the European fur market. Fur traders made traps to catch the sea minks and also pursued them with dogs. Even before the European expansion, Native Americans would capture the animals for their pelts and flesh. A large contributing factor to the eventual extinction of the sea mink was the unregulated hunting and harvesting of these animals. Another possible contributing factor was the high mortality rate of the young. Ultimately, the sea mink became extinct sometime between 1860 and 1870.[7][9]

Subspecies

Debate has occurred regarding whether the sea mink is its own species, or a subspecies of American mink. Those who argue that the sea mink is a subspecies often refer to it as Neovison vison macrodon.[10] However, research has been conducted in which the teeth of the sea mink, dating back 5000 to 250 years ago, were compared with 158 other mink species. It found a substantial difference in dental proportions between N. macrodon and N. vison, comparable to the dental differences between pairs of related species. The sea minks' back teeth were broader than those of American mink, suggesting the sea mink had adapted over time to eating harder-bodied prey. This suggests reproductive isolation, an independent evolutionary direction, and ultimately, support for the hypothesis that sea minks are their own species Neovison macrodon.[4][11]

References

  1. ↑ Turvey, S.; Helgen, K. (2008). "Neovison macrodon". IUCN Red List of Threatened Species. Version 2008. International Union for Conservation of Nature. Retrieved 6 January 2009.
  2. ↑ Day, David (1981). The Encyclopedia of Vanished Species. London: Universal Books Ltd. p. 220. ISBN 0-947889-30-2.
  3. ↑ Canadian Wildlife Service. (2006). Sea Mink. Environment Canada – Species at Risk. <http://www.speciesatrisk.gc.ca>. Downloaded on 19 October 2014.
  4. 1 2 3 4 Sealfon RA (2007). "Dental Divergence Supports Species Status of the Extinct Sea Mink (Neovison macrodon)". Journal of Mammalogy. 88 (2): 371–383. doi:10.1644/06-MMM-A-227R1.1. JSTOR 4498666.
  5. ↑ Hollister, N. (1965). "A synopsis of the American minks". Proceedings of the United States National Museum. 44: 471–480. doi:10.5479/si.00963801.44-1965.471.
  6. ↑ Manville, R.H. (1966). "The extinct sea mink, with taxonomic notes". Proceedings of the United States National Museum. 122: 1–12. doi:10.5479/si.00963801.122-3584.1.
  7. 1 2 3 Sea mink. arkive.org
  8. ↑ Westfall, Scottie. "Animal Facts Sea Mink." Critters 360. Helium, Inc., 27 May 2009. Web. 20 Oct. 2014. <http://www.critters360.com/index.php/animal-facts-sea-mink-18817/>.
  9. ↑ sid. "sea mink". Retrieved 19 October 2014.
  10. ↑ Kays, Roland W. & Wilson, Don E. (2009). Mammals of North America (Paperback) (2nd ed.). Princeton University Press. p. 180. ISBN 9780691140926.
  11. ↑ Westfall, Scottie. "Animal Facts Sea Mink". Critters.

Further reading

Wikispecies has information related to: Neovison
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