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Hokkaidō Wolf
The Hokkaido wolf (''Canis lupus hattai''), also known as the and in Russia as the Sakhalin wolf,Heptner, V. G. & Naumov, N., P. (1998''Mammals of the Soviet Union'' Vol.II Part 1a, SIRENIA AND CARNIVORA (Sea cows; Wolves and Bears) Science Publishers, Inc., USA, pp. 193, is an extinct subspecies of gray wolf that once inhabited coastal northeast Asia. Its nearest relatives were the wolves of North America rather than Asia. It was exterminated in Hokkaido during the Meiji Restoration period, when American-style agricultural reforms incorporated the use of strychnine-laced baits to kill livestock predators. Stable URL: https://www.jstor.org/stable/1178791 Some taxonomists believe that it survived up until 1945 on the island of Sakhalin. It was one of two subspecies that were once found in the Japanese archipelago, the other being the Japanese wolf (''C. l. hodophilax''). Taxonomy and origin The Ezō wolf or Hokkaidō wolf (''Canis lupus hattai'' Kishida, 1931) is an extinct s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kyukichi Kishida
was a Japanese zoologist, who published in arachnology, mammalogy, and herpetology. He described several spider Genus, genera and species including : * ''Heptathela'' ** ''Heptathela kimurai'' (Kimura-gumo) * ''Pireneitega'' References * External links Journal of Arachnology 33(2):501-508. 2005 Arachnologists Japanese mammalogists 1888 births 1968 deaths 20th-century Japanese zoologists People from Maizuru Scientists from Kyoto Prefecture {{zoologist-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Coalescent Theory
Coalescent theory is a Scientific modelling, model of how alleles sampled from a population may have originated from a most recent common ancestor, common ancestor. In the simplest case, coalescent theory assumes no genetic recombination, recombination, no natural selection, and no gene flow or population structure (genetics), population structure, meaning that each variant is equally likely to have been passed from one generation to the next. The model looks backward in time, merging alleles into a single ancestral copy according to a random process in coalescence events. Under this model, the expected time between successive coalescence events increases almost exponential growth, exponentially back in time (with wide variance). Variance in the model comes from both the random passing of alleles from one generation to the next, and the random occurrence of mutations in these alleles. The mathematical theory of the coalescent was developed independently by several groups in the earl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Google Books
Google Books (previously known as Google Book Search, Google Print, and by its code-name Project Ocean) is a service from Google that searches the full text of books and magazines that Google has scanned, converted to text using optical character recognition (OCR), and stored in its digital database.The basic Google book link is found at: https://books.google.com/ . The "advanced" interface allowing more specific searches is found at: https://books.google.com/advanced_book_search Books are provided either by publishers and authors through the Google Books Partner Program, or by Google's library partners through the Library Project. Additionally, Google has partnered with a number of magazine publishers to digitize their archives. The Publisher Program was first known as Google Print when it was introduced at the Frankfurt Book Fair in October 2004. The Google Books Library Project, which scans works in the collections of library partners and adds them to the digital inventory, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cambridge University Press
Cambridge University Press was the university press of the University of Cambridge. Granted a letters patent by King Henry VIII in 1534, it was the oldest university press in the world. Cambridge University Press merged with Cambridge Assessment to form Cambridge University Press and Assessment under Queen Elizabeth II's approval in August 2021. With a global sales presence, publishing hubs, and offices in more than 40 countries, it published over 50,000 titles by authors from over 100 countries. Its publications include more than 420 academic journals, monographs, reference works, school and university textbooks, and English language teaching and learning publications. It also published Bibles, runs a bookshop in Cambridge, sells through Amazon, and has a conference venues business in Cambridge at the Pitt Building and the Sir Geoffrey Cass Sports and Social Centre. It also served as the King's Printer. Cambridge University Press, as part of the University of Cambridge, was a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ainu People
The Ainu are an Indigenous peoples, indigenous ethnic group who reside in northern Japan and southeastern Russia, including Hokkaido and the Tōhoku region of Honshu, as well as the land surrounding the Sea of Okhotsk, such as Sakhalin, the Kuril Islands, the Kamchatka Peninsula, and the Khabarovsk Krai. They have occupied these areas, known to them as "Ainu Mosir" (), since before the arrival of the modern Yamato people, Yamato and Treaty of Aigun, Russians. These regions are often referred to as and its inhabitants as in historical Japanese texts. Along with the Yamato and Ryukyuan people, Ryukyu ethnic groups, the Ainu people are one of the primary historic ethnic groups of Japan. Official surveys of the known Ainu population in Hokkaido received 11,450 responses in 2023, and the Ainu population in Russia was estimated at 300 in 2021. Unofficial estimates in 2002 placed the total population in Japan at 200,000 or higher, as the near-total Cultural assimilation, assimilatio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Japan Glaciation
Japan is an island country in East Asia. Located in the Pacific Ocean off the northeast coast of the Asian mainland, it is bordered on the west by the Sea of Japan and extends from the Sea of Okhotsk in the north to the East China Sea in the south. The Japanese archipelago consists of four major islands—Hokkaido, Honshu, Shikoku, and Kyushu—and thousands of smaller islands, covering . Japan has a population of over 123 million as of 2025, making it the eleventh-most populous country. The capital of Japan and its largest city is Tokyo; the Greater Tokyo Area is the largest metropolitan area in the world, with more than 37 million inhabitants as of 2024. Japan is divided into 47 administrative prefectures and eight traditional regions. About three-quarters of the country's terrain is mountainous and heavily forested, concentrating its agriculture and highly urbanized population along its eastern coastal plains. The country sits on the Pacific Ring of Fire ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Evolution Of The Wolf
It is widely agreed that the evolutionary lineage of the grey wolf can be traced back 2 million years to the Early Pleistocene species '' Canis etruscus,'' and its successor the Middle Pleistocene '' Canis mosbachensis''. The grey wolf ''Canis lupus'' is a highly adaptable species that is able to exist in a range of environments and which possesses a wide distribution across the Holarctic. Studies of modern grey wolves have identified distinct sub-populations that live in close proximity to each other. This variation in sub-populations is closely linked to differences in habitat – precipitation, temperature, vegetation, and prey specialization – which affect cranio-dental plasticity. The earliest specimens of the modern grey wolf date to around 400,000 years ago, or possibly earlier to 1 million years ago. Most modern wolves share most of their common ancestry within the last 25-23,000 years from earlier Siberian wolf populations. While some sources have suggested that this i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
British Columbia Wolf
The British Columbia wolf (''Canis lupus columbianus'') is a subspecies of gray wolf which lives in a narrow region that includes those parts of the mainland coast and near-shore islands that are covered with temperate rainforest, which extends from Vancouver Island, British Columbia, to the Alexander Archipelago in south-east Alaska. This area is bounded by the Coast Mountains. Taxonomy The wolf was first classed as a distinct subspecies in 1941 by Edward Goldman, who described his specimen as being large with a skull closely resembling that of '' C. l. pambasileus'', and whose fur is generally of a cinnamon-buff colour. This wolf is recognized as a subspecies of ''Canis lupus'' in the taxonomic authority ''Mammal Species of the World (2005)''. Studies using mitochondrial DNA have indicated that the wolves of coastal south-east Alaska are genetically distinct from inland gray wolves, reflecting a pattern also observed in other taxa. They show a phylogenetic relationship with ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Radiocarbon Dating
Radiocarbon dating (also referred to as carbon dating or carbon-14 dating) is a method for Chronological dating, determining the age of an object containing organic material by using the properties of carbon-14, radiocarbon, a radioactive Isotopes of carbon, isotope of carbon. The method was developed in the late 1940s at the University of Chicago by Willard Libby. It is based on the fact that radiocarbon () is constantly being created in the Atmosphere of Earth, Earth's atmosphere by the interaction of cosmic rays with atmospheric nitrogen. The resulting combines with atmospheric oxygen to form radioactive carbon dioxide, which is incorporated into plants by photosynthesis; animals then acquire by eating the plants. When the animal or plant dies, it stops exchanging carbon with its environment, and thereafter the amount of it contains begins to decrease as the undergoes radioactive decay. Measuring the amount of in a sample from a dead plant or animal, such as a piece of w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Isotopes
Isotopes are distinct nuclear species (or ''nuclides'') of the same chemical element. They have the same atomic number (number of protons in their nuclei) and position in the periodic table (and hence belong to the same chemical element), but different nucleon numbers (mass numbers) due to different numbers of neutrons in their nuclei. While all isotopes of a given element have similar chemical properties, they have different atomic masses and physical properties. The term isotope is derived from the Greek roots isos ( ἴσος "equal") and topos ( τόπος "place"), meaning "the same place"; thus, the meaning behind the name is that different isotopes of a single element occupy the same position on the periodic table. It was coined by Scottish doctor and writer Margaret Todd in a 1913 suggestion to the British chemist Frederick Soddy, who popularized the term. The number of protons within the atom's nucleus is called its atomic number and is equal to the number of el ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Isotope Analysis
Isotope analysis is the identification of isotopic signature, abundance of certain stable isotopes of chemical elements within organic and inorganic compounds. Isotopic analysis can be used to understand the flow of energy through a food web, to reconstruct past environmental and climatic conditions, to investigate human and animal diets, for food authentification, and a variety of other physical, geological, palaeontological and chemical processes. Stable isotope ratios are measured using mass spectrometry, which separates the different isotopes of an element on the basis of their mass-to-charge ratio. Tissues affected Isotopic oxygen is incorporated into the body primarily through ingestion at which point it is used in the formation of, for archaeological purposes, bones and teeth. The oxygen is incorporated into the hydroxylcarbonic apatite of bone and tooth enamel. Bone is continually remodelled throughout the lifetime of an individual. Although the rate of tur ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tsugaru Strait
The is a strait between Honshu and Hokkaido in northern Japan connecting the Sea of Japan with the Pacific Ocean. It was named after the western part of Aomori Prefecture. The Seikan Tunnel passes under it at its narrowest point 12.1 miles (19.5 km) between Tappi Misaki on the Tsugaru Peninsula in Aomori Prefecture, Honshu, and Shirakami Misaki on the Matsumae Peninsula in Hokkaido. Western maps made prior to the 20th century also referred to this waterway as the Strait of Sangar. Japan's territorial waters extend to three nautical miles (5.6 km) into the strait instead of the usual twelve, reportedly to allow nuclear-armed United States Navy warships and submarines to transit the strait without violating Japan's prohibition against nuclear weapons in its territory. Despite this, the part of the Tsugaru Strait considered to be in international waters is still within Japan's exclusive economic zone An exclusive economic zone (EEZ), as prescribed by the 1982 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
