Porcupine caribou
Porcupine caribou | |
---|---|
Male Porcupine caribou (R. a. arcticus) grazing in Alaska | |
Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Chordata |
Class: | Mammalia |
Order: | Artiodactyla |
Family: | Cervidae |
Subfamily: | Capreolinae |
Genus: | Rangifer |
Species: | |
Subspecies: | R. a. arcticus,
pearyi, fortidens, montanus, osborni, stonei, dawsoni (extinct) |
Trinomial name | |
Rangifer arcticus arcticus,
pearyi, fortidens, montanus, osborni, stonei, dawsoni (extinct)Richardson, 1829
| |
Approximate range of Porcupine caribou in yellow. Overlap with other subspecies of caribou is possible for contiguous range. 1. Woodland caribou (Rangifer caribou), which is subdivided into ecotypes: boreal, migratory and mountain, 2. R. a. dawsoni (extinct 1908), 3. R. a. arcticus, 4. R. t. groenlandicus, 5. R. a. arcticus, 6. R. a. pearyi |
The Porcupine caribou (Rangifer tarandus groenlandicus) is a herd or ecotype of barren-ground caribou, the subspecies of the reindeer or caribou found in Alaska, United States, and Yukon and the Northwest Territories, Canada.
Migratory caribou herds are named after their calving grounds, in this case the
By July 2017, the Porcupine herd had reached a record high of about 202,000 to 235,000 animals. Sixteen years earlier, in 2001 the same herd was only half as large. While other barren-ground caribou herds have declined by 90%, the Porcupine herd has remained relatively stable.
Taxonomy
The Porcupine caribou is a herd of the barren-ground
Grant's caribou was described as a small, pale form occupying a limited range at the west end of the Alaska Peninsula and nearby islands. Originally described as Rangifer granti (Allen, 1902),[5] it was brought under barren-ground caribou as R. arcticus granti [6][7][8] because its size and form were closer to the barren-ground type than to the larger, darker montane forms in Alaska. When Banfield revised the Rangifer genus, bringing all reindeer and caribou under Rangifer tarandus, he gave the subspecies name granti to all the caribou in Alaska and some in Yukon, thus greatly expanding its range. Subsequently, taxonomists comparing Alaskan or Yukon migratory barren-ground caribou with those of mainland Canada labelled their Alaska/Yukon samples as R. t. granti. Youngman (1975)[9] re-assigned it to Canada/Alaska barren-ground caribou, R. tarandus groenlandicus after Banfield's (1961)[10] name change. Because Geist (1998),[11] and others, could find no morphological features to distinguish Alaskan from Canadian barren-ground caribou, granti was not accepted in the authoritative reference work, Mammalian Species of the World (Grubb, Artiodactyla in Wilson and Reeder 2005)[2] and its replacement, Handbook of the mammals of the World (Mattioli, Cervidae, in Wilson and Mittermeier 2011).[12] Caribou geneticists agree that Alaska/Yukon migratory barren-ground and Canadian barren-ground caribou are barely distinguishable (e.g., Cronin et al. 2005;[13] Yannic et al. 2013[14]). Further history of the name granti is given in Reindeer.
In a stunning sequel, caribou geneticists discovered that caribou still living at the western end of the Alaskan Peninsula and nearby islands—which contains the type locality of Rangifer granti Allen 1902—are genetically distinct from, and do not interbreed with, nearby forms of caribou. Its range encompasses the type locality designated by Allen 1902.[15][16][17] Thus, R. a. granti was rediscovered in its original, limited range and its type species in the American Museum of Natural History remains valid.
A recent revision[18] returns the Porcupine and other herds of barren-ground caribou to R. arcticus arcticus Richardson 1829.[19]
Range
The Porcupine herd range covers 1,500 mi (2,400 km), from the calving grounds, the Porcupine River after which they are named, to "the river valleys and slopes in the Ogilvie and Richardson Mountains in the Yukon and the southern Brooks Range in Alaska."[20]: 3 The calving area is located on 1.5 million acres (0.61 million ha) in the Porcupine River coastal region of the Beaufort Sea known as the 1002 area, which is part of the Arctic National Wildlife Refuge.[21] The area runs through a large part of the range of the Porcupine herd.[1][22]
In the spring the pregnant cows move "northeast from the Alaskan winter ranges or north and northwest from the Canadian winter ranges. If snowmelt is early, they will then move westward along the north slope of the Brooks Range into Alaska."[20]: 3
Most Porcupine caribou calves are born in the first week of June and they are at their most vulnerable from their primary predators on the calving ground—golden eagles, grizzly bears and wolves—during the first three weeks when they are dependent on milk from their mothers. About one quarter of them die during this period.[20]: 5, 6 Their 1,500-mile (2,400 km) annual land migration between their winter range in the boreal forests of Alaska and Yukon over the mountains to the coastal plain and their calving grounds on the Beaufort Sea coastal plain,[21]
Management
The Alaska Department of Fish and Game, Canadian wildlife agencies, and local
Herd size
"We might have just recorded [July 2017] the largest number for this herd since modern scientific monitoring started in the 1970s... Given the state of caribou worldwide right now, it's a positive, shining light in the caribou world — that there are some herds that are doing well."
— Mike Suitor, regional biologist, North Yukon Region with Environment Yukon, Dawson City. 2018. CBC News
Unlike many other Rangifer species, subspecies and their ecotypes, the Porcupine herd is stable at relatively high numbers. Some barren-ground caribou herds have "declined more than 90 per cent from historic averages", causing the Committee on the Status of Endangered Wildlife in Canada (COSEWIC), to sound the alarm.[28]
According to an aerial count reported in July 2017, the size of the Porcupine herd had increased to "between 202,000 and 235,000 animals, nearly twice the number of animals recorded at a low point in 2001.[28]
A previous peak population occurred in 1989 with 178,000 animals and was followed by a decline by 2001 to 123,000. A recovery was observed in 2010 with an increase to 169,000 animals.[1][22]
Potential threats to the Porcupine herd
Climate change and the increased frequency of extreme weather events, such as unprecedented late slow melting, negatively affect the Porcupine herd. As a result there was "very high early calf mortality."[20]: 10 The primary predators for calves are golden eagles, grizzly bears and wolves.[20] "Caribou exposed to industrial development shift away from the pipelines and roads."[20]: 12 The passage of the provision opening ANWR's 1002 to oil and gas drilling is considered to be a threat.[21] In 2001, some biologists feared development in the Refuge would "push caribou into the foothills, where calves would be more prone to predation."[21] In their 2005 report, Russell and McNeil reiterated concerns that new calving areas would make the herd more vulnerable, as area 1002 provides a much higher quality of diet conditions than the alternatives in Canada.[20]
Indigenous peoples
The Porcupine caribou are a valued resource as primary sustenance to indigenous peoples in Alaska and northern Canada.
Arctic National Wildlife Refuge
The Arctic National Wildlife Refuge (ANWR) covers 19 million acres (7.7 million ha) of the northern Alaskan coast,[29] in northeast Alaska[21] between the Beaufort Sea to the north, Brooks Range to the south and Prudhoe Bay to the west. It is the largest protected wilderness in the United States and was created by Congress under the Alaska National Interest Lands Conservation Act of 1980.[30]
Ivvavik National Park
Ivvavik National Park protects a portion of the calving grounds of the Porcupine herd and restricts the number of people who may visit annually. During the calving in May, caribou are at their most vulnerable. Caribou management calls for preservation of calving grounds. Large portions of the calving grounds have been protected in the Arctic National Wildlife Refuge in Alaska, United States, and Ivvavik National Park and Vuntut National Park in Yukon, Canada.[38]
Central Arctic caribou herd
In 2001, proponents of the development of the oil fields at Prudhoe Bay and Kuparuk, which would be approximately 60 miles (97 km) west of the refuge, argued that the Central Arctic caribou herd had increased its numbers "in spite of several hundred miles of gravel roads and more than a thousand miles of elevated pipe." However, the Central Arctic herd is much smaller than the Porcupine herd and has a range that is much larger.
The 1002 coastal plain provides calving habitat for [the Porcupine herd] nearly five times as large as the central Arctic herd, in an area one-fifth as big. Some biologists fear development here could push caribou into the foothills, where calves would be more prone to predation
— Mitchell National Geographic 2001[21]
See also
- Arctic Refuge drilling controversy
- Being Caribou
- Caribou herds and populations in Canada
- Jonathon Solomon
- Reindeer distribution
References
- ^ a b c Campbell, Cora (2 March 2011), Porcupine Caribou Herd shows growth, Press release, Juneau, Alaska: Alaska Department of Fish and Game, retrieved 27 January 2014
- ^ OCLC 62265494.
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- ^ Millais JG (1915) The caribou. In: Carruthers D, Millais JG, Byl PBVD, Wallace HF, Kennion L-CRL, Barklay FG (Eds) The Gun at Home and Abroad. London & Counties Press Association Ltd., London, U.K., 255-280.
- ^ Allen JA (1902) A new caribou from the Alaska Peninsula. Bulletin of the American Museum of Natural History XVI: 119-127
- ^ Osgood WH (1909) Biological investigations in Alaska and Yukon Territory. US Department of Agriculture Biological survey of North American fauna 1: 1-285.
- ^ Murie OJ (1935) Alaska-Yukon caribou. Vol. 54, United States Department of Agriculture Bureau of Biological Survey, Washington D.C., 93 pp.
- ^ Anderson RM (1946) Catalogue of Canadian Recent mammals. National Museum of Canada Bulletin No. 102, Biological Series 31, Ottawa, Ontario, 238 pp.
- ^ Youngman PM (1975) Mammals of the Yukon Territory. National Museum of Canada, Publications in Zoology No. 10, 192 pp
- ^ Banfield AWF (1961) A revision of the reindeer and caribou, genus Rangifer. National Museum of Canada Bulletin 177, Biological Series No. 66, Ottawa, Ontario, 137 pp.
- ^ Geist V (1998) Deer of the world: their evolution, behavior, and ecology. Stackpole Books, Mechanicsburg, Pennsylvania, 421 pp.
- ^ Mattioli S (2011) Family Cervidae: Deer. In: Wilson DE, Mittermeier RA (Eds) Handbook of the mammals of the world 2 Hoofed mammals. Lynx Edicions, Barcelona, Spain, 350-443.
- ^ Cronin MA, MacNeil MD, Patton JC (2005) Variation in mitochondrial DNA and microsatellite DNA in caribou (Rangifer tarandus) in North America. Journal of Mammalogy 86: 495-505.
- ^ Yannic G, Pellissier L, Ortego J, Lecomte N, Couturier S, Cuyler C, Dussault C, Hundertmark KJ, Irvine RJ, Jenkins DA, Kolpashikov L, Mager K, Musiani M, Parker KL, Røed KH, Sipko T, Þórisson SG, V.Weckworth B, Guisan A, Bernatchez L, Côté SD (2013) Genetic diversity in caribou linked to past and future climate change. Nature Climate Change 4: 132-137. doi:10.1038/NCLIMATE2074.
- ^ Mager KH, Colson KE, Groves P, Hundertmark KJ (2014) Population structure over a broad spatial scale driven by nonanthropogenic factors in a wide-ranging migratory mammal, Alaskan caribou. Molecular Ecology 23: 6045-6057
- ^ Colson KE, Mager KH, Hundertmark KJ (2014) Reindeer introgression and the population genetics of caribou in southwestern Alaska. Journal of Heredity 105: 585-596
- ^ Yannic G, Ortego J, Pellissier L, Lecomte N, Bernatchez L, Côté SD (2018) Linking genetic and ecological differentiation in an ungulate with a circumpolar distribution. Ecography 41: 922-937.
- ^ Harding LE (2022) Available names for Rangifer (Mammalia, Artiodactyla, Cervidae) species and subspecies. ZooKeys 1119: 117-151. doi:10.3897/zookeys.1119.80233.
- ^ Richardson J (1829) Fauna boreali-americana; or, the zoology of the northern parts of British America; containing descriptions of the objects of natural history collected on the late northern land expeditions, under command of Captain Sir John Franklin, R.N. Vol. 1 Quadrupeds, John Murray, London, U.K., 300 pp.
- ^ a b c d e f g Russell, Don E.; McNeil, P. (March 2005). Summer Ecology of the Porcupine Caribou Herd (PDF) (Report) (2 ed.). Whitehorse, Yukon: Porcupine Caribou Management Board (PCMB). This report includes detailed maps of the region.
- ^ a b c d e f g Mitchell, John (August 1, 2001). "Oil Field or Sanctuary?". National Geographic. Archived from the original on January 5, 2008. Retrieved March 21, 2018.
- ^ hdl:10535/9749.
- Whitehorse, Yukon.
- ^ Dawson City, Yukon. February 14, 2018.
- ^ "Agreement Between the Government of the United States and the government of Canada on the Conservation of the Porcupine Caribou Herd" (PDF). New York. 1987.
- ^ a b United Nations. Agreement Between the Government of the United States and the government of Canada on the Conservation of the Porcupine Caribou Herd New York: UNU. 1987.[1]
- ^ "Cox, R. Environmental Communication and the Public Sphere, 2013, Sage Publications"
- ^ a b Morin, Philippe (January 4, 2018). "Porcupine caribou numbers 'highest ever recorded'". CBC News. Retrieved March 21, 2018.
'It's a positive, shining light in the caribou world,' says Yukon biologist
- ^ Burger, Joel. "Adequate science: Alaska's Arctic refuge". Conservation Biology 15 (2): 539.
- ^ United States. 96th Congress. "Alaska National Interest Lands Conservation Act". Fws.gov <"ANILCA Table of Contents". Archived from the original on 2008-08-28. Retrieved 2008-08-28.>. Retrieved on 2008-8-10.
- InsideClimate News.
- ^ Natter, Ari; Dlouhy, Jennifer A. (2017-12-19). "Tax Bill Opens Arctic Refuge for Oil, But Years of Delay May Follow". Bloomberg L.P. Retrieved 2017-12-20.
- InsideClimate News.
- ^ Scott Detrow, Senate May Approve Drilling In Alaskan Wilderness With Tax Bill, NPR (November 18, 2017).
- ^ a b Solomon, Christopher (November 16, 2017). "The ANWR Drilling Rights in the Tax-Reform Bill". Outside.
- . Retrieved March 21, 2018.
- ^ "Potential Oil Production from the Coastal Plain of the Arctic National Wildlife Refuge: Updated Assessment". US DOE. Archived from the original on 3 April 2009. Retrieved 2009-03-14.
- ^ Smithson, Brandi; Jjumba, Anthony (2006), "Threats to the Porcupine Caribou Herd", Simon Fraser University (SFU), Atlas of the Porcupine Caribou, retrieved March 21, 2018