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Arctic Wolves
The Arctic wolf (''Canis lupus arctos''), also known as the white wolf or polar wolf, is a subspecies of grey wolf native to the High Arctic tundra of Canada's Queen Elizabeth Islands, from Melville Island to Ellesmere Island.https://ecoregions.appspot.com/ Unlike some populations that move between tundra and forest regions, Arctic wolves spend their entire lives north of the northern treeline. Their distribution to south is limited to the northern fringes of the Middle Arctic tundra on the southern half of Prince of Wales and Somerset Islands. It is a medium-sized subspecies, distinguished from the northwestern wolf by its smaller size, its whiter colouration, its narrower braincase,Goldman, E. A. (1964). Classification of wolves. In ''The Wolves of North America'' Part 2. Young, S. P. & Goldman, E. A. (Eds.) New York: Dover Publs. p. 430. and larger carnassials. Since 1930, there has been a progressive reduction in size in Arctic wolf skulls, which is likely the result ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Reginald I
Reginald I may refer to: * Reginald I, Count of Burgundy (968–1057), Count of the Free County of Burgundy from 1026 * Reginald I, Count of Bar (died 1149), called "the One-eyed", Count of Bar from 1105 * Reginald I of Guelders Reginald I of Guelders (1255 – October 9, 1326 in Monfort) was Count of Guelders from January 10, 1271 until his death. He was the son of Otto II, Count of Guelders and Philippe of Dammartin. In 1276 he married Irmgard of Limburg, only daughte ... (1255–1326), Count of Guelders from 1271 * Rögnvaldr Óláfsson (fl. 1164) ( fl. 1164), referred to in some texts as Reginald, ruler of the Isle of Man for a brief period in 1164 {{hndis ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Greenland Wolf
The Greenland wolf ( taxonomic Latin: ''Canis lupus orion'', Danish: ''grønlandsulv'') is a subspecies of gray wolf that is native to Greenland. Historically, it was heavily persecuted, but today it is fully protected and about 90% of the wolf's range falls within the boundaries of the Northeast Greenland National Park. A recent genomic study has shown that wolves of Ellesmere Island, Canada, likely should be included in the same subspecies, a view also supported by earlier morphological reviews. The entire population is very small, probably about 200 individuals but with significant uncertainty due to its very remote range. Taxonomy and evolution In 1935, the British zoologist Reginald Pocock attributed the subspecies name ''Canis lupus orion'' to a specimen from Cape York, northwest Greenland. He also attributed the name ''Canis lupus arctos'' (Arctic wolf) to a specimen from Melville Island in the nearby Queen Elizabeth Islands, Canada. Both wolves are recognized as separ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nansen's Fram Expedition
Nansen's ''Fram'' expedition of 1893–1896 was an attempt by the Norwegian explorer Fridtjof Nansen to reach the geographical North Pole by harnessing the natural east–west current of the Arctic Ocean. In the face of much discouragement from other polar explorers, Nansen took his ship ''Fram'' to the New Siberian Islands in the eastern Arctic Ocean, froze her into the pack ice, and waited for the drift to carry her towards the pole. Impatient with the slow speed and erratic character of the drift, after 18 months Nansen and a chosen companion, Hjalmar Johansen, left the ship with a team of Samoyed dogs and sledges and made for the pole. They did not reach it, but they achieved a record Farthest North latitude of 86°13.6′N before a long retreat over ice and water to reach safety in Franz Josef Land. Meanwhile, ''Fram'' continued to drift westward, finally emerging in the North Atlantic Ocean. The idea for the expedition had arisen after items from the American vessel ''Je ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Otto Sverdrup
Otto Neumann Knoph Sverdrup (31 October 1854, in Bindal, Helgeland – 26 November 1930) was a Norwegian sailor and Arctic explorer. Early and personal life He was born in Bindal as a son of farmer Ulrik Frederik Suhm Sverdrup (1833–1914) and his wife Petra Neumann Knoph (1831–1885). He was a great-grandnephew of Georg Sverdrup and Jacob Liv Borch Sverdrup, first cousin twice removed of Harald Ulrik Sverdrup (politician), Harald Ulrik and Johan Sverdrup, second cousin once removed of Jakob Sverdrup (politician), Jakob, Georg Sverdrup (theologian), Georg and Edvard Sverdrup, third cousin of Georg Johan Sverdrup, Georg Johan, Jakob Sverdrup (philologist), Jakob, Mimi Sverdrup Lunden, Mimi, Leif J. Sverdrup, Leif and Harald Sverdrup (oceanographer), Harald Ulrik Sverdrup. He was a brother-in-law of Johan Vaaler, and Otto himself married his own first cousin, Gretha Andrea Engelschiøn (1866–1937), in October 1891 in Oslo, Kristiania. Their daughter Audhild Sverdrup (1893– ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
National Oceanic And Atmospheric Administration
The National Oceanic and Atmospheric Administration (abbreviated as NOAA ) is an United States scientific and regulatory agency within the United States Department of Commerce that forecasts weather, monitors oceanic and atmospheric conditions, charts the seas, conducts deep sea exploration, and manages fishing and protection of marine mammals and endangered species in the U.S. exclusive economic zone. Purpose and function NOAA's specific roles include: * ''Supplying Environmental Information Products''. NOAA supplies to its customers and partners information pertaining to the state of the oceans and the atmosphere, such as weather warnings and forecasts via the National Weather Service. NOAA's information services extend as well to climate, ecosystems, and commerce. * ''Providing Environmental Stewardship Services''. NOAA is a steward of U.S. coastal and marine environments. In coordination with federal, state, local, tribal and international authorities, NOAA manages the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Habitat
In ecology, the term habitat summarises the array of resources, physical and biotic factors that are present in an area, such as to support the survival and reproduction of a particular species. A species habitat can be seen as the physical manifestation of its ecological niche. Thus "habitat" is a species-specific term, fundamentally different from concepts such as environment or vegetation assemblages, for which the term "habitat-type" is more appropriate. The physical factors may include (for example): soil, moisture, range of temperature, and light intensity. Biotic factors will include the availability of food and the presence or absence of predators. Every species has particular habitat requirements, with habitat generalist species able to thrive in a wide array of environmental conditions while habitat specialist species requiring a very limited set of factors to survive. The habitat of a species is not necessarily found in a geographical area, it can be the interior ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Single-nucleotide Polymorphism
In genetics, a single-nucleotide polymorphism (SNP ; plural SNPs ) is a germline substitution of a single nucleotide at a specific position in the genome. Although certain definitions require the substitution to be present in a sufficiently large fraction of the population (e.g. 1% or more), many publications do not apply such a frequency threshold. For example, at a specific base position in the human genome, the G nucleotide may appear in most individuals, but in a minority of individuals, the position is occupied by an A. This means that there is a SNP at this specific position, and the two possible nucleotide variations – G or A – are said to be the alleles for this specific position. SNPs pinpoint differences in our susceptibility to a wide range of diseases, for example age-related macular degeneration (a common SNP in the CFH gene is associated with increased risk of the disease) or nonalcoholic fatty liver disease (a SNP in the PNPLA3 gene is associated with inc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
United States Fish And Wildlife Service
The United States Fish and Wildlife Service (USFWS or FWS) is an agency within the United States Department of the Interior dedicated to the management of fish, wildlife, and natural habitats. The mission of the agency is "working with others to conserve, protect, and enhance fish, wildlife, plants and their habitats for the continuing benefit of the American people." Among the responsibilities of the USFWS are enforcing federal wildlife laws; protecting endangered species; managing migratory birds; restoring nationally significant fisheries; conserving and restoring wildlife habitats, such as wetlands; helping foreign governments in international conservation efforts; and distributing money to fish and wildlife agencies of U.S. states through the Wildlife Sport Fish and Restoration Program. The vast majority of fish and wildlife habitats are on U.S. state, state or private land not controlled by the United States government. Therefore, the USFWS works closely with private g ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
National Center For Ecological Analysis And Synthesis
The National Center for Ecological Analysis and Synthesis (NCEAS) is a research center at the University of California, Santa Barbara, in Santa Barbara, California, Santa Barbara, California. Better known by its acronym, NCEAS (pronounced “n-seas”) opened in May 1995. Funding for NCEAS is diverse and includes supporters such as the U.S. National Science Foundation, the Government of California, State of California, and the University of California, Santa Barbara. NCEAS supports cross-disciplinary research that analyzes and synthesizes existing data to address major fundamental issues in ecology and allied fields, and encourages the application of science to natural resource management and public policy decision making. To facilitate synthetic analysis, NCEAS advances new techniques in mathematical and geospatial modeling, dynamic simulation, and Scientific visualization, visualization of ecological systems through its Ecoinformatics program. Since its inception, the Center has ho ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Haplotype
A haplotype ( haploid genotype) is a group of alleles in an organism that are inherited together from a single parent. Many organisms contain genetic material ( DNA) which is inherited from two parents. Normally these organisms have their DNA organized in two sets of pairwise similar chromosomes. The offspring gets one chromosome in each pair from each parent. A set of pairs of chromosomes is called diploid and a set of only one half of each pair is called haploid. The haploid genotype (haplotype) is a genotype that considers the singular chromosomes rather than the pairs of chromosomes. It can be all the chromosomes from one of the parents or a minor part of a chromosome, for example a sequence of 9000 base pairs. However, there are other uses of this term. First, it is used to mean a collection of specific alleles (that is, specific DNA sequences) in a cluster of tightly linked genes on a chromosome that are likely to be inherited together—that is, they are likely to be con ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mitochondrial DNA
Mitochondrial DNA (mtDNA or mDNA) is the DNA located in mitochondria, cellular organelles within eukaryotic cells that convert chemical energy from food into a form that cells can use, such as adenosine triphosphate (ATP). Mitochondrial DNA is only a small portion of the DNA in a eukaryotic cell; most of the DNA can be found in the cell nucleus and, in plants and algae, also in plastids such as chloroplasts. Human mitochondrial DNA was the first significant part of the human genome to be sequenced. This sequencing revealed that the human mtDNA includes 16,569 base pairs and encodes 13 proteins. Since animal mtDNA evolves faster than nuclear genetic markers, it represents a mainstay of phylogenetics and evolutionary biology. It also permits an examination of the relatedness of populations, and so has become important in anthropology and biogeography. Origin Nuclear and mitochondrial DNA are thought to be of separate evolutionary origin, with the mtDNA being derived ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Microsatellite
A microsatellite is a tract of repetitive DNA in which certain DNA motifs (ranging in length from one to six or more base pairs) are repeated, typically 5–50 times. Microsatellites occur at thousands of locations within an organism's genome. They have a higher mutation rate than other areas of DNA leading to high genetic diversity. Microsatellites are often referred to as short tandem repeats (STRs) by forensic geneticists and in genetic genealogy, or as simple sequence repeats (SSRs) by plant geneticists. Microsatellites and their longer cousins, the minisatellites, together are classified as VNTR (variable number of tandem repeats) DNA. The name "satellite" DNA refers to the early observation that centrifugation of genomic DNA in a test tube separates a prominent layer of bulk DNA from accompanying "satellite" layers of repetitive DNA. They are widely used for DNA profiling in cancer diagnosis, in kinship analysis (especially paternity testing) and in forensic identific ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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