Grizzly–polar bear hybrid

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File:Polarbrown-1.jpg
Polar/brown bear hybrid, Rothschild Museum, Tring
File:Polarbrown-2.jpg
Polar/brown bear hybrid, Rothschild Museum, Tring

A grizzly–polar bear hybrid (also pizzly bear, polizzly, prizzly bear, pizzly-grizzly, nanulak, Polar-Grizz[citation needed], or grolar bear[1][2]) is a rare ursid hybrid that has occurred both in captivity and in the wild. In 2006, the occurrence of this hybrid in nature was confirmed by testing the DNA of a unique-looking bear that had been shot near Sachs Harbour, Northwest Territories on Banks Island in the Canadian Arctic.[3]

Possible wild-bred polar bear-grizzly bear hybrids have been reported and shot in the past, but DNA tests were not available to verify the bears' ancestry.

Analyses of DNA sequences of bears have recovered multiple instances of introgressive hybridization between various bear species,[4][5][6] including introgression of polar bear DNA into brown bears during the Pleistocene.

Occurrences in the wild

With many suspected sightings and three confirmed cases,[7] theories of how such hybrids might naturally occur have become more than hypothetical. Although these two species are genetically similar and often found in the same territories, they tend to avoid each other in the wild. They also fill different ecological niches.

Grizzlies (and also Kodiak bears and "Alaskan brown bears", which are all subspecies of the brown bear, Ursus arctos), tend to live and breed on land. Polar bears prefer the water and ice, usually breeding on the ice.

The yellowish-white MacFarlane's bear, a mysterious animal known only from one specimen acquired in 1864, seems to attest that grizzly-polar bear hybrids may have always occurred from time to time. Another theory suggests that the polar bears have been driven southward by the melting of the ice cap, bringing them into closer contact with grizzly bears.

2006 discovery

Jim Martell, a hunter from Idaho, found and shot a grizzly–polar bear hybrid near Sachs Harbour on Banks Island, Northwest Territories reportedly on 16 April 2006.[1][3] Martell had been hunting for polar bears with an official license and a guide, at a cost of $45,450,[8] and killed the animal believing it to be a normal polar bear. Officials took interest in the creature after noticing that while it had thick, creamy white fur typical of polar bears, it also had long claws, a humped back, a shallow face, and brown patches around its eyes, nose, back, and foot, which are all traits of grizzly bears. If the bear had been adjudicated to be a grizzly, the hunter would have faced a possible CAN$1,000 fine and up to a year in jail.[9]

A DNA test conducted by Wildlife Genetics International in British Columbia confirmed it was a hybrid, with a polar bear mother and a grizzly bear father.[3] It is the first documented case in the wild,[10] though it was known that this hybrid was biologically possible and other ursid hybrids have been bred in zoos in the past.

Amidst much controversy, the bear has since been returned to Martell.[11][12]

2010 discovery

On 8 April 2010, David Kuptana, an Inuvialuit hunter from the nearby community of Ulukhaktok on Victoria Island shot what he thought was a polar bear. After inspecting the bear and having its DNA tested, it was discovered that the bear's mother was a grizzly-polar hybrid and the father was a grizzly bear. The Department of Environment and Natural Resources for the NWT said that it "...may be the first recorded second-generation polar-grizzly bear hybrid found in the wild".[13] The bear possesses physical characteristics intermediate between grizzlies and polar bears, such as brown fur on its paws, long claws, and a grizzly-like head.

2016 discovery

In 2016, near Arviat, Nunavut, a blonde bear was shot and killed by an Inuit hunter. Subsequent DNA samples of the specimen were sent to a lab on May 18, 2016, and results are still pending.[14][15][16]

2010 report

Biologists affiliated with the American Museum of Natural History and City College of the City University of New York have prepared a new report published in Canadian Field Naturalist that offers the first documented evidence that grizzlies are migrating into polar bear territory. Researchers found that seven grizzlies had been spotted in Wapusk National Park south of Churchill, Manitoba, between 2003 and 2008.[17][18]

Naming

File:Ursidae hybridisation.svg
Possible hybridisation between different species of bear

Since the 2006 discovery placed the hybrid into the spotlight, the media have referred to this animal with several portmanteau names, such as pizzly, grolar bear,[19] and polizzly, but there is no consensus on the use of any one of these terms. Canadian wildlife officials have suggested calling the hybrid "nanulak", taken from the Inuit names for polar bear (nanuk) and grizzly bear (aklak).[20]

By one convention,[21] the name of the sire comes first in such combinations: the offspring of a male polar bear and a female grizzly would be the suggested nanulak or a "pozzly bear", while the offspring of a male grizzly and a female polar bear would be a "grilar bear" or possibly an aknuk, however the sports company Gola are currently trying to secure naming rights on the animal to help with the re-launch of their football boots. If the remains of MacFarlane's 1864 specimen—which was validly described according to ICZN rules—were traced and confirmed to be such a hybrid by ancient DNA techniques, the scientific name Ursus × inopinatus would be available for these animals.[citation needed]

Characteristics

Two grizzly–polar hybrid cubs (one female and one male) were born at Osnabrück Zoo in Osnabrück, Germany, in 2004, and their physical traits are generally an intermediate between the polar bear and the grizzly bear.[22] For example, their bodies are smaller than polar bears, but larger than grizzlies, while their heads fall between the broader grizzly head and the leaner polar bear head.[22] They have long necks like polar bears, but small shoulder humps like grizzlies.[22] The soles of their feet are partially covered in hair; polar bears have hair-covered soles, which act as insulation, and grizzlies have hairless soles.[22]

Similarly, the hair of the hybrids exhibits a pattern of hollowness, which blends the traits of both polar bears and grizzlies. In cross section, the hair of polar bears is hollow, while the hair of grizzlies is either solid or has small hollow regions.[22] This varies according to which part of the grizzly the hair is located.[22] In the hybrid male, the paw hair was solid, but the dark back hair was somewhat hollow, albeit with "smaller empty regions than found in polar bear hair".[22] The hair of the female hybrid, "contains a range of hollow regions".[22]

The hybrids demonstrated behavior more similar to polar bears than grizzlies. They stomped toys similar to how polar bears break ice, and hurled bags to the side "as polar bears may hurl prey".[22] Grizzlies given the same bags do not demonstrate this hurling behavior.[22] The hybrids were also observed lying down similar to polar bears: on their bellies with rear legs splayed.[22]

References

  1. ↑ 1.0 1.1 Lua error in package.lua at line 80: module 'strict' not found.
  2. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  3. ↑ 3.0 3.1 3.2 Lua error in package.lua at line 80: module 'strict' not found.
  4. ↑ Verena E Kutschera, Tobias Bidon, Frank Hailer, Julia L. Rodi, Steven R. Fain, Axel Janke (2014) Bears in a Forest of Gene Trees: Phylogenetic Inference Is Complicated by Incomplete Lineage Sorting and Gene Flow. Molecular Biology and Evolution 31(8): 2004–2017. doi:10.1093/molbev/msu186
  5. ↑ Frank Hailer, Verena E. Kutschera, Björn M. Hallström, Denise Klassert, Steven R. Fain, Jennifer A. Leonard, Ulfur Arnason, Axel Janke (2012): Nuclear Genomic Sequences Reveal that Polar Bears Are an Old and Distinct Bear Lineage. Science Vol. 336 no. 6079: 344-347. doi:10.1126/science.1216424
  6. ↑ Miller W, Schuster SC, Welch AJ, Ratan A, Bedoya-Reina OC, Zhao F, Kim HL, Burhans RC, Drautz DI, Wittekindt NE, Tomsho LP, Ibarra-Laclette E, Herrera-Estrella L, Peacock E, Farley S, Sage GK, Rode K, Obbard M, Montiel R, Bachmann L, Ingólfsson O, Aars J, Mailund T, Wiig O, Talbot SL, & Lindqvist C (2012). Polar and brown bear genomes reveal ancient admixture and demographic footprints of past climate change. Proceedings of the National Academy of Sciences of the United States of America, 109(36):E2382–E2390. doi:10.1073/pnas.1210506109
  7. ↑ "Alien Ice Bear" UK Channel 5 TV Documentary
  8. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  9. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  10. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  11. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  12. ↑ Alicia P.Q. Wittmeyer Rare hybrid bear coming to Reno hunting show Tahoe Daily Tribune, January 19, 2007
  13. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  14. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  15. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  16. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  17. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  18. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  19. ↑ Hunter may have shot grolar bear – or was it pizzly? at the Wayback Machine (archived May 25, 2006), CBC North, 26 April 2006.
  20. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  21. ↑ Naming Conventions A semi-scientific reference for hybrid naming conventions, with specific examples of big-cat hybrids.
  22. ↑ 22.00 22.01 22.02 22.03 22.04 22.05 22.06 22.07 22.08 22.09 22.10 Lua error in package.lua at line 80: module 'strict' not found.

External links

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