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Haida Ermine
The Haida ermine (''Mustela haidarum'') is a mustelid species endemic to a few islands off the Pacific Northwest of North America, namely Haida Gwaii in Canada and the southern Alexander Archipelago in the U.S. state of Alaska. Indigenous names In the Haida language, this species is known as ''daayáats’'' in its brown summer coat and ''tlag'' in its winter coat. Taxonomy The three subspecies comprising this species were originally considered subspecies of '' Mustela erminea'', but in 2013 they were recognized as distinct from any other ermine, and a 2021 study found them to together comprise a distinct species. ''M. haidarum'' is thought have originated about 375,000 years ago (during the Pleistocene), and is thought to be a result of ancient hybrid speciation between the Beringian ermine (''M. erminea'') and American ermine (''M. richardsonii''). The islands are thought to been glacial refugia during the Last Glacial Maximum, with both species of ermine being isolated o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Edward Alexander Preble
Edward Alexander Preble (born in Somerville, Massachusetts on ; died ) was an American naturalist and conservationist. He is noted for work in studying birds and mammals of the Pacific Northwest. He also acted as an editor for nature magazines. In 1908, Preble published a report on the natural history of the Athabaska-Mackenzie region, or "Boreal America". This monograph was based his two expeditions, in 1901 and again in 1903-4, with the U.S. Biological Survey. In 1907, Preble and Ernest Thompson Seton discovered the remains of a wolf pack near a long abandoned cabin at the Great Slave Lake in Canada. The two verified the claim of the American frontiersman Charles "Buffalo" Jones, who a full decade earlier in 1897-1898 had traveled to the Arctic Circle in an attempt to capture live musk oxen. Jones had claimed that he and his party shot and fended off the hungry wolves from inside their cabin. In 1925 Preble became a Consulting Naturalist for Nature Magazine ''Natur ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Last Glacial Maximum
The Last Glacial Maximum (LGM), also referred to as the Late Glacial Maximum, was the most recent time during the Last Glacial Period that ice sheets were at their greatest extent. Ice sheets covered much of Northern North America, Northern Europe, and Asia and profoundly affected Earth's climate by causing drought, desertification, and a large drop in sea levels. Based on changes in position of ice sheet margins dated via terrestrial cosmogenic nuclides and radiocarbon dating, growth of ice sheets commenced 33,000 years ago and maximum coverage was between 26,500 years and 19–20,000 years ago, when deglaciation commenced in the Northern Hemisphere, causing an abrupt rise in sea level. Decline of the West Antarctica ice sheet occurred between 14,000 and 15,000 years ago, consistent with evidence for another abrupt rise in the sea level about 14,500 years ago. Glacier fluctuations around the Strait of Magellan suggest the peak in glacial surface area was constrained to betw ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Parvoviridae
Parvoviruses are a family of animal viruses that constitute the family ''Parvoviridae''. They have linear, single-stranded DNA (ssDNA) genomes that typically contain two genes encoding for a replication initiator protein, called NS1, and the protein the viral capsid is made of. The coding portion of the genome is flanked by telomeres at each end that form into hairpin loops that are important during replication. Parvovirus virions are small compared to most viruses, at 23–28 nanometers in diameter, and contain the genome enclosed in an icosahedral capsid that has a rugged surface. Parvoviruses enter a host cell by endocytosis, travelling to the nucleus where they wait until the cell enters its replication stage. At that point, the genome is uncoated and the coding portion is replicated. Viral messenger RNA (mRNA) is then transcribed and translated, resulting in NS1 initiating replication. During replication, the hairpins repeatedly unfold, are replicated, and refold to chang ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Canine Distemper
Canine distemper virus (CDV) (sometimes termed footpad disease) is a viral disease that affects a wide variety of mammal families, including domestic and wild species of dogs, coyotes, foxes, pandas, wolves, ferrets, skunks, raccoons, and felines, as well as pinnipeds, some primates, and a variety of other species. CDV does not affect humans. In canines CDV affects several body systems, including the gastrointestinal and respiratory tracts and the spinal cord and brain. Common symptoms include high fever, eye inflammation and eye/nose discharge, labored breathing and coughing, vomiting and diarrhea, loss of appetite and lethargy, and hardening of nose and footpads. The viral infection can be accompanied by secondary bacterial infections and can present eventual serious neurological symptoms. Canine distemper is caused by a single-stranded RNA virus of the family '' Paramyxoviridae'' (the same family of the viruses that causes measles, mumps, and bronchiolitis in humans). The ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spillover Infection
Spillover infection, also known as pathogen spillover and spillover event, occurs when a reservoir population with a high pathogen prevalence comes into contact with a novel host population. The pathogen is transmitted from the reservoir population and may or may not be transmitted within the host population. Due to climate change and land use expansion, the risk of viral spillover is predicted to significantly increase. Spillover zoonoses Spillover is a common event; in fact, more than two-thirds of human viruses are zoonotic. Most spillover events result in self-limited cases with no further human to human transmission, as occurs, for example, with rabies, anthrax, histoplasmosis or hidatidosis. Other zoonotic pathogens are able to be transmitted by humans to produce secondary cases and even to establish limited chains of transmission. Some examples are the Ebola and Marburg filoviruses, COVID-19, the MERS and SARS coronaviruses or some avian flu viruses. Finally, some few spi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tongass National Forest
The Tongass National Forest () in Southeast Alaska is the largest U.S. National Forest at . Most of its area is temperate rain forest and is remote enough to be home to many species of endangered and rare flora and fauna. The Tongass, which is managed by the United States Forest Service, encompasses islands of the Alexander Archipelago, fjords and glaciers, and peaks of the Coast Mountains. An international border with Canada (British Columbia) runs along the crest of the Boundary Ranges of the Coast Mountains. The forest is administered from Forest Service offices in Ketchikan. There are local ranger district offices located in Craig, Hoonah, Juneau, Ketchikan, Petersburg, Sitka, Thorne Bay, Wrangell, and Yakutat. History The Alexander Archipelago Forest Reserve was established by Theodore Roosevelt in a presidential proclamation of 20 August 1902. Another presidential proclamation made by Roosevelt, on 10 September 1907, created the Tongass National Forest. On 1 July ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Temperate Rainforest
Temperate rainforests are coniferous or broadleaf forests that occur in the temperate zone and receive heavy rain. Temperate rain forests occur in oceanic moist regions around the world: the Pacific temperate rain forests of North American Pacific Northwest as well as the Appalachian temperate rainforest of the Eastern U.S. Sun Belt; the Valdivian temperate rain forests of southwestern South America; the rain forests of New Zealand and southeastern Australia; northwest Europe (small pockets in Great Britain and larger areas in Ireland, southern Norway and northern Iberia); southern Japan; the Black Sea–Caspian Sea region from the southeasternmost coastal zone of the Bulgarian coast, through Turkey, to Georgia, and northern Iran. The moist conditions of temperate rain forests generally support an understory of mosses, ferns and some shrubs and berries. Temperate rain forests can be temperate coniferous forests or temperate broadleaf and mixed forests. Definition For ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Suemez Island
Suemez Island is located in the Alexander Archipelago of southeastern Alaska, United States. It resides in the west-central coast of Prince of Wales Island (Alaska), Prince of Wales Island. The northern tip of Dall Island lies to its southeast, while Baker Island (Alaska), Baker Island lies to its northwest. Suemez Island has a land area of 151.713 km2 (58.5768 sq mi) and was unpopulated at the United States Census, 2000, 2000 census. The Tlevak Strait-Suemez Island volcano at 55°15′0″N, 133°18′0″W is 50 metres (164 feet) high. Suemez Island was named sometime between 1775 and 1779 by Juan Francisco de la Bodega y Quadra and Francisco Antonio Mourelle as "Isla Suemez". Dionisio Alcalá Galiano called it "Guemes" in his map published in 1802, which may be the proper spelling. The name "Guemes" honors Juan Vicente de Güemes Padilla Horcasitas y Aguayo, 2nd Count of Revillagigedo, Juan Vicente de Güemes Padilla Horcasitas y Aguayo, Viceroy of New Spain from 1789 t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Prince Of Wales Island (Alaska)
Prince of Wales Island ( Tlingit: ''Taan'') is one of the islands of the Alexander Archipelago in the Alaska Panhandle. It is the fourth-largest island in the United States (after Hawaii, Kodiak Island, and Puerto Rico) and the 97th-largest island in the world. Geography and ecology The island is long, wide and has an area of , about one-tenth the size of Ireland and slightly larger than the state of Delaware. Approximately 6,000 people live on the island. Craig is the largest community; founded as a saltery in the early 20th century, it has a population of 1,500. Some 900 people live in Klawock, a long-established village that grew with the fishing industry. Hollis was a boom and bust mining town from 1900 to about 1915. Abandoned, it was re-established as a logging camp in the 1950s. It now has a population of 100 and is the location of the ferry terminal. Mountain peaks, all but the tallest of which were buried by Pleistocene glaciation, reach over . Fjords, ste ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Moresby Island
Moresby Island ( hai, Gwaii Haanas) is a large island () that forms part of the Haida Gwaii archipelago (formerly known as Queen Charlotte Islands) in British Columbia, Canada, located at . It is separated by the narrow Skidegate Channel from the other principal island of the group to the north, Graham Island. Gwaii Haanas National Park Reserve and Haida Heritage Site includes Moresby and other islands. The island, together with numerous nearby smaller islands and islets in the southern archipelago, is defined by Statistics Canada as Skeena-Queen Charlotte E (Now North Coast Regional District Area E), with a population of 340 as of the 2016 census. Almost all of its population resided in the unincorporated community of Sandspit, on the northeast corner of Moresby. The total land area of the electoral area is . Moresby Island is the 175th largest island in the world, and the 32nd largest island in Canada. On October 27, 2012, an earthquake of magnitude 7.7 (the stronge ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Graham Island
Graham Island () is the largest island in the Haida Gwaii archipelago (previously known as the Queen Charlotte Islands), lying off the mainland coast of British Columbia, Canada. It is separated by the narrow Skidegate Channel from the other principal island of the group to the south, Moresby Island (''T'aaxwii X̱aaydag̱a Gwaay.yaay linag̱waay'' in the language of the Haida people). It has a population of 3,858 (2016 census), an area of , and is the 101st largest island in the world and Canada's 22nd largest island. Graham Island was named in 1853 by James Charles Prevost, commander of HMS ''Virago'', for Sir James Graham, 2nd Baronet, who was First Lord of the Admiralty at the time. Communities * Daajing Giids (formerly known as ''Queen Charlotte City'') * Juskatla * Masset * Old Massett * Port Clements * Skidegate * Tlell Attractions * Naikoon Provincial Park * North Beach https://www.ehcanadatravel.com/british-columbia/haidagwaii/parks-trails/4715-north-beach-n ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Southeast Alaska
Southeast Alaska, colloquially referred to as the Alaska(n) Panhandle, is the southeastern portion of the U.S. state of Alaska, bordered to the east and north by the northern half of the Canadian province of British Columbia (and a small part the Yukon Territories). The majority of Southeast Alaska's area is part of the Tongass National Forest, the United States' largest national forest. In many places, the international border runs along the crest of the Boundary Ranges of the Coast Mountains (see Alaska boundary dispute). The region is noted for its scenery and mild, rainy climate. The largest cities in the region are Juneau, Sitka, and Ketchikan. This region is also home to Hyder, the easternmost town in Alaska. Geography Southeast Alaska has a land area of , comprising much of the Alexander Archipelago. The largest islands are, from North to South, Chichagof Island, Admiralty Island, Baranof Island, Kupreanof Island, Revillagigedo Island and Prince of Wales Isl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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