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Beaver Eradication In Tierra Del Fuego
The governments of Chile and Argentina are attempting to eradicate the North American beaver in the Tierra del Fuego area at the southernmost tip of South America. This non-native species was introduced in 1946 as a potential source of commercial fur trading. When the putative fur trade industry failed, the beavers became problematic and the governments agreed to intervene to wipe them out. A June 2011 NPR report stated that the beavers have caused millions of dollars in damages. According to ''Nature'', this plan is the largest eradication project ever attempted. Background and history In 1946, the Argentinian government imported fifty beavers from Canada, which were to be released in Cami Lake with the intention of creating a commercial fur trading industry. Though a viable industry ultimately failed to materialize, the introduction of the beavers into the region has had far-reaching consequences. The North American beavers have no natural predators in the area. In their n ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bulldozer
A bulldozer or dozer (also called a crawler) is a large, motorized machine equipped with a metal blade to the front for pushing material: soil, sand, snow, rubble, or rock during construction work. It travels most commonly on continuous tracks, though specialized models riding on large off-road tires are also produced. Its most popular accessory is a ripper, a large hook-like device mounted singly or in multiples in the rear to loosen dense materials. Bulldozers are used heavily in large and small scale construction, road building, minings and quarrying, on farms, in heavy industry factories, and in military applications in both peace and wartime. The word "bulldozer" refers only to a motorized unit fitted with a blade designed for pushing. The word is sometimes used inaccurately for other heavy equipment such as a front-end loader designed for carrying rather than pushing material. Description Typically, bulldozers are large and powerful tracked heavy equipment. T ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Steel
Steel is an alloy made up of iron with added carbon to improve its strength and fracture resistance compared to other forms of iron. Many other elements may be present or added. Stainless steels that are corrosion- and oxidation-resistant typically need an additional 11% chromium. Because of its high tensile strength and low cost, steel is used in buildings, infrastructure, tools, ships, trains, cars, machines, electrical appliances, weapons, and rockets. Iron is the base metal of steel. Depending on the temperature, it can take two crystalline forms (allotropic forms): body-centred cubic and face-centred cubic. The interaction of the allotropes of iron with the alloying elements, primarily carbon, gives steel and cast iron their range of unique properties. In pure iron, the crystal structure has relatively little resistance to the iron atoms slipping past one another, and so pure iron is quite ductile, or soft and easily formed. In steel, small amounts of carbon, other ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bosque (journal)
''Bosque'' is a scientific journal published by the Forestry Faculty of the Southern University of Chile. It publishes articles on a wide range of forestry-related topics, primarily on issues that are relevant to Chile, Latin America and the Southern Hemisphere. The published articles include peer-reviewed scientific research papers, items of current interest and opinion pieces. ''Bosque's'' first issue was published in 1975 and the journal was issued yearly until 1985. From 1985 to 2003 it was issued twice a year and from 2003 on three times a year. The topics covered in ''Bosque'' are management and production of forestry resources, wood science and technology, silviculture, forest ecology, natural resources conservation, and rural development associated with forest ecosystems. The journal publishes research articles, notes and opinions, both in Spanish and English. ''Bosque'' was included in the Science Citation Index Expanded in 2009. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Holocene
The Holocene ( ) is the current geological epoch. It began approximately 11,650 cal years Before Present (), after the Last Glacial Period, which concluded with the Holocene glacial retreat. The Holocene and the preceding Pleistocene together form the Quaternary period. The Holocene has been identified with the current warm period, known as MIS 1. It is considered by some to be an interglacial period within the Pleistocene Epoch, called the Flandrian interglacial.Oxford University Press – Why Geography Matters: More Than Ever (book) – "Holocene Humanity" section https://books.google.com/books?id=7P0_sWIcBNsC The Holocene corresponds with the rapid proliferation, growth and impacts of the human species worldwide, including all of its written history, technological revolutions, development of major civilizations, and overall significant transition towards urban living in the present. The human impact on modern-era Earth and its ecosystems may be considered of global si ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Biome
A biome () is a biogeographical unit consisting of a biological community that has formed in response to the physical environment in which they are found and a shared regional climate. Biomes may span more than one continent. Biome is a broader term than habitat and can comprise a variety of habitats. While a biome can cover large areas, a microbiome is a mix of organisms that coexist in a defined space on a much smaller scale. For example, the human microbiome is the collection of bacteria, viruses, and other microorganisms that are present on or in a human body. A biota is the total collection of organisms of a geographic region or a time period, from local geographic scales and instantaneous temporal scales all the way up to whole-planet and whole-timescale spatiotemporal scales. The biotas of the Earth make up the biosphere. Etymology The term was suggested in 1916 by Clements, originally as a synonym for '' biotic community'' of Möbius (1877). Later, it gained its c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Universidad De Magallanes
University of Magallanes (UMAG) is a university in the southern Chilean city of Punta Arenas. It is a public state university and it is part of the Chilean Traditional Universities. The University of Magallanes was established in 1981 during the neoliberal reforms of the Chile's military regime as the successor of Universidad Técnica del Estado's Punta Arenas section. Universidad Técnica del Estado had established the Punta Arenas section in 1961. The University of Magallanes have campuses in Punta Arenas and Puerto Natales as well as a university centre in Puerto Williams. University of Magallanes publishes the humanities and social sciences journal ''Magallania ''Magallania'' is an academic journal published by the University of Magallanes. It publishes articles on social sciences and humanities regarding Patagonia, Tierra del Fuego, and Antarctica Antarctica () is Earth's southernmost and lea ...'' twice a year. Accreditation The university has full accredita ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Christopher B
Christopher is the English language, English version of a Europe-wide name derived from the Greek language, Greek name Χριστόφορος (''Christophoros'' or ''Christoforos''). The constituent parts are Χριστός (''Christós''), "Jesus, Christ" or "Anointing, Anointed", and φέρειν (''phérein''), "to bear"; hence the "Christ-bearer". As a given name, 'Christopher' has been in use since the 10th century. In English, Christopher may be abbreviated as "Chris", "Topher", and sometimes "Kit (given name), Kit". It was frequently the most popular male first name in the United Kingdom, having been in the top twenty in England and Wales from the 1940s until 1995, although it has since dropped out of the top 100. The name is most common in England and not so common in Wales, Scotland, or Republic of Ireland, Ireland. People with the given name Antiquity and Middle Ages * Saint Christopher (died 251), saint venerated by Catholics and Orthodox Christians * Christopher (Do ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tierra Del Fuego Province, Chile
Tierra del Fuego Province ( es, Provincia de Tierra del Fuego) is one of four provinces in the southern Chilean region of Magallanes and Antártica Chilena (XII). It includes the Chilean or western part of the main island of Tierra del Fuego, except for the part south of the Cordillera Darwin, which is in Antártica Chilena Province. (Argentina also has a Tierra del Fuego Province.) Chilean Tierra del Fuego has two towns, Porvenir, capital of the province, and Cerro Sombrero, and a number of small villages. A key geographical feature is Bahía Inútil ("Useless Bay"), so named by British geographers in the late 19th century because the bay is not useful as a port. Geology and hydrography Gold-bearing sands have been recorded at a number of sites within the Fuegan shores of the Tierra del Fuego Province. Chilean Tierra del Fuego is known for numerous small lakes, including Lago Blanco and Lago Deseado. The climate is Subpolar Oceanic, bordering on a Tundra climate Demograp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Beaver Dam
A beaver dam or beaver impoundment is a dam built by beavers to create a pond which protects against predators such as coyotes, wolves and bears, and holds their food during winter. These structures modify the natural environment in such a way that the overall ecosystem builds upon the change, making beavers a keystone species and ecosystem engineers. They build prolifically at night, carrying mud and stones with their forepaws and timber between their teeth. Construction A minimum water level of is required to keep the underwater entrance to beaver lodges from being blocked by ice during the winter. In lakes, rivers and large streams with deep enough water, beavers may not even need to build dams, and instead simply live in bank burrows and lodges. If the water is not deep enough to keep beavers safe from predators and their lodge entrances ice-free, beavers build dams.Beavers start construction by diverting the stream to lessen the water's flow pressure. Branches and logs ar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Coppiced
Coppicing is a traditional method of woodland management which exploits the capacity of many species of trees to put out new shoots from their stump or roots if cut down. In a coppiced wood, which is called a copse, young tree stems are repeatedly cut down to near ground level, resulting in a stool. New growth emerges, and after a number of years, the coppiced tree is harvested, and the cycle begins anew. Pollarding is a similar process carried out at a higher level on the tree in order to prevent grazing animals from eating new shoots. ''Daisugi'' (台杉, where ''sugi'' refers to Japanese cedar), is a similar Japanese technique. Many silviculture practices involve cutting and regrowth; coppicing has been of significance in many parts of lowland temperate Europe. The widespread and long-term practice of coppicing as a landscape-scale industry is something that remains of special importance in southern England. Many of the English language terms referenced in this article are pa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hectares
The hectare (; SI symbol: ha) is a non-SI metric unit of area equal to a square with 100-metre sides (1 hm2), or 10,000 m2, and is primarily used in the measurement of land. There are 100 hectares in one square kilometre. An acre is about and one hectare contains about . In 1795, when the metric system was introduced, the ''are'' was defined as 100 square metres, or one square decametre, and the hectare ("hecto-" + "are") was thus 100 ''ares'' or km2 (10,000 square metres). When the metric system was further rationalised in 1960, resulting in the International System of Units (), the ''are'' was not included as a recognised unit. The hectare, however, remains as a non-SI unit accepted for use with the SI and whose use is "expected to continue indefinitely". Though the dekare/decare daa (1,000 m2) and are (100 m2) are not officially "accepted for use", they are still used in some contexts. Description The hectare (), although not a unit of SI, is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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