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Wood Lemming
The wood lemming (''Myopus schisticolor'') is a species of rodent in the family Cricetidae. It belongs to the rodent subfamily Arvicolinae, so is a relative of the voles, lemmings, and muskrats. It is found in the taiga biome of China, Estonia, Finland, Mongolia, Norway, Russia, and Sweden. Sex determination Wood lemmings produce about three times as many female as male offspring. This is due to an unusual genetic system where they have two different types of X chromosomes, the normal X and a mutated X*. Females with that mutation on their X*-chromosome inhibit the male determining effect of the Y chromosome. This leads to three genetic types of females: XX, X*X and X*Y and one genetic type of males XY. The X*Y females are fertile, but only produce X* ova, which means they only produce female offspring. It is not fully known the extent to which nature balances out the differences in the adult population, but sampling studies seem to suggest males do make up as little as 25% of the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gerrit Smith Miller Jr
Gerrit is a Dutch male name meaning "''brave with the spear''", the Dutch and Frisian form of Gerard. People with this name include: * Gerrit Achterberg (1905–1962), Dutch poet * Gerrit van Arkel (1858–1918), Dutch architect * Gerrit Badenhorst (born 1962), South African powerlifter and professional strongman competitor * Gerrit Battem (c. 1636 – 1684), Dutch landscape painter * Gerrit Beneker (1882–1934), American painter and illustrator * Gerrit Berckheyde (1638–1698), Dutch painter * Gerrit Berkhoff (1901–1996), Dutch chemist and university rector * Gerrit Cornelis Berkouwer (1903–1996), Dutch theologian * Gerrit Berveling (born 1944), Dutch Esperanto author * Gerrit Blaauw (1924–2018), Dutch computer engineer * Gerrit de Blanken (1894–1961), Dutch pottery artist * Gerrit van Bloclant (1578–1650), Dutch Renaissance painter * Gerrit Bol (1906–1989), Dutch mathematician * Gerrit Braamcamp (1699–1771), Dutch distiller, timber merchant and art ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sweden
Sweden, formally the Kingdom of Sweden, is a Nordic countries, Nordic country located on the Scandinavian Peninsula in Northern Europe. It borders Norway to the west and north, and Finland to the east. At , Sweden is the largest Nordic country by both area and population, and is the List of European countries by area, fifth-largest country in Europe. Its capital and largest city is Stockholm. Sweden has a population of 10.6 million, and a low population density of ; 88% of Swedes reside in urban areas. They are mostly in the central and southern half of the country. Sweden's urban areas together cover 1.5% of its land area. Sweden has a diverse Climate of Sweden, climate owing to the length of the country, which ranges from 55th parallel north, 55°N to 69th parallel north, 69°N. Sweden has been inhabited since Prehistoric Sweden, prehistoric times around 12,000 BC. The inhabitants emerged as the Geats () and Swedes (tribe), Swedes (), who formed part of the sea-faring peopl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mammals Described In 1844
A mammal () is a vertebrate animal of the class Mammalia (). Mammals are characterised by the presence of milk-producing mammary glands for feeding their young, a broad neocortex region of the brain, fur or hair, and three middle ear bones. These characteristics distinguish them from reptiles and birds, from which their ancestors diverged in the Carboniferous Period over 300 million years ago. Around 6,640 extant species of mammals have been described and divided into 27 orders. The study of mammals is called mammalogy. The largest orders of mammals, by number of species, are the rodents, bats, and eulipotyphlans (including hedgehogs, moles and shrews). The next three are the primates (including humans, monkeys and lemurs), the even-toed ungulates (including pigs, camels, and whales), and the Carnivora (including cats, dogs, and seals). Mammals are the only living members of Synapsida; this clade, together with Sauropsida (reptiles and birds), constitutes the larg ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fauna Of Scandinavia
Fauna (: faunae or faunas) is all of the animal life present in a particular region or time. The corresponding terms for plants and fungi are ''flora'' and ''funga'', respectively. Flora, fauna, funga and other forms of life are collectively referred to as '' biota''. Zoologists and paleontologists use ''fauna'' to refer to a typical collection of animals found in a specific time or place, e.g. the "Sonoran Desert fauna" or the "Burgess Shale fauna". Paleontologists sometimes refer to a sequence of faunal stages, which is a series of rocks all containing similar fossils. The study of animals of a particular region is called faunistics. Etymology ''Fauna'' comes from the name Fauna, a Roman goddess of earth and fertility, the Roman god Faunus, and the related forest spirits called Fauns. All three words are cognates of the name of the Greek god Pan, and ''panis'' is the Modern Greek equivalent of fauna (πανίς or rather πανίδα). ''Fauna'' is also the word for a book ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lemmini
Lemmini is a tribe of lemmings in the subfamily Arvicolinae. Species in this tribe are: Tribe Lemmini * Genus ''Lemmus'' - true lemmings ** Amur lemming (''L. amurensis'') ** Norway lemming (''L. lemmus'') ** Beringian lemming (''L. nigripes'') ** East Siberian lemming (''L. paulus'') ** West Siberian lemming (''L. sibiricus'') ** North American brown lemming (''L. trimucronatus'') * Genus '' Myopus'' - wood lemming ** Wood lemming (''M. schisticolor'') * Genus '' Synaptomys'' - bog lemmings ** Northern bog lemming (''S. borealis'') ** Southern bog lemming (''S. cooperi'') The fossil taxa '' Mictomys'', '' Tobienia'' (both thought to be allied with ''Synaptomys''), and '' Plioctomys'' (thought to be allied with ''Lemmus'' and ''Myopus'') are also thought to belong to this group. A 2021 phylogenetic study using mtDNA recovered Lemmini as being the most basal clade of the Arvicolinae, diverging during the late Miocene The Miocene ( ) is the first epoch (geology), geolo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thermogenesis
Thermogenesis is the process of heat production in organisms. It occurs in all warm-blooded animals, and also in a few species of thermogenic plants such as the Eastern skunk cabbage, the Voodoo lily ('' Sauromatum venosum''), and the giant water lilies of the genus '' Victoria''. The lodgepole pine dwarf mistletoe, '' Arceuthobium americanum'', disperses its seeds explosively through thermogenesis. Types Depending on whether or not they are initiated through locomotion and intentional movement of the muscles, thermogenic processes can be classified as one of the following: * Obligatory Thermogenesis: Heat produced from energy expended for vital metabolic processes necessary to sustain an organism. * Exercise activity thermogenesis (EAT) * Non-exercise activity thermogenesis (NEAT): Energy expended for any spontaneous physical activity that is not a structured exercise routine or sports-like exercise. This can include but is not limited to walking, leisure activities, fid ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kamchatka Peninsula
The Kamchatka Peninsula (, ) is a peninsula in the Russian Far East, with an area of about . The Pacific Ocean and the Sea of Okhotsk make up the peninsula's eastern and western coastlines, respectively. Immediately offshore along the Pacific coast of the peninsula runs the Kuril–Kamchatka Trench. The Kamchatka Peninsula, the Commander Islands, and Karaginsky Island constitute Kamchatka Krai of the Russian Federation. The majority of the 322,079 inhabitants are ethnic Russians, with about 13,000 being Koryaks (2014). More than half of the population lives in Petropavlovsk-Kamchatsky (179,526 in 2010) and nearby Yelizovo (38,980). The Kamchatka Peninsula contains the volcanoes of Kamchatka, a UNESCO World Heritage Site, that form part of the Ring of Fire. Geography Politically, the peninsula forms part of Kamchatka Krai. The southern tip is called Cape Lopatka. (Lopatka is Russian for spade.) The circular bay to the north of this on the Pacific side is Ava ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vaccinium
''Vaccinium'' is a common and widespread genus of shrubs or dwarf shrubs in the heath family (Ericaceae). The fruits of many species are eaten by humans and some are of commercial importance, including the cranberry, blueberry, bilberry (whortleberry), lingonberry (cowberry), and huckleberry. Like many other heath plants, they are restricted to acidic soils. Description The plant structure varies between species: some trail along the ground, some are dwarf shrubs, and some are larger shrubs perhaps tall. Some tropical species are epiphytic. Stems are usually woody. Flowers are epigynous with fused petals and have long styles that protrude from their bell-shaped corollas. Stamens have anthers with extended tube-like structures called "awns" through which pollen falls when mature. Inflorescences can be axillary or terminal. The fruit develops from an inferior ovary and is a four- or five-parted berry; it is usually brightly coloured, often red or bluish with purple juice. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Deschampsia
''Deschampsia'' is a genus of plants in the grass family Poaceae, commonly known as hair grass or tussock grass. The genus is widespread across many countries.Palisot de Beauvois, Ambroise Marie François Joseph. 1812. Essai d'une Nouvelle Agrostographie 91 descriptions in Latin, etymology explained in French The genus is named for French physician and naturalist Louis Auguste Deschamps (1765–1842). ''Deschampsia'' species are used as food plants by the e of some species of |
Pleurozium Schreberi
''Pleurozium schreberi'', the red-stemmed feathermoss or Schreber's big red stem moss, is a moss with a loose growth pattern. The prefix 'pleuro-' is derived from the Latin word for ribs, possibly referring to the way the branches extend from the stem. The species is commonly found on the floor of the boreal forests of Canada, Scandinavia, and northern Russia. It is a characteristic component of black spruce/feathermoss climax forest, which sometimes have a moderately dense overstory canopy and a forest floor dominated by feathermosses such as '' Hylocomium splendens'' and ''Ptilium crista-castrensis''.C. Michael Hogan. 2008''Black Spruce: Picea mariana'', GlobalTwitcher.com, ed. Nicklas Stromberg In a study of the effect of the herbicide Asulam on moss growth found that ''Pleurozium schreberi'' exhibited intermediate sensitivity to exposure. Gallery Image:PleuroziumPiceaBorealForest.JPG, ''Pleurozium schreberi'' carpeting the floor of black spruce (''Picea mariana'') and bals ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ptilium (plant)
''Ptilium'' is a genus of mosses with very broad worldwide occurrence. This genus is within the family Hypnaceae,* in the class Bryopsida, subclass Bryidae and order Hypnales. Ecology Some of these species occur on the floor of Canada, Canadian boreal forests; an example of this occurrence is within the black spruce/feathermoss Climax community, climax forest, often having moderately dense canopy and featuring a forest floor of feathermosses including, according to Hogan, ''Hylocomium splendens'', ''Pleurozium schreberi'' and ''Ptilium crista-castrensis''.C. Michael Hogan. 2008''Black Spruce: Picea mariana'', GlobalTwitcher.com, ed. Nicklas Stromberg/ref> See also * Feather moss References Hypnaceae Moss genera {{hypnales-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Polytrichum
''Polytrichum'' is a genus of mosses — commonly called haircap moss or hair moss — which contains approximately 70 species that have a cosmopolitan distribution. The genus ''Polytrichum'' has a number of closely related sporophyte, sporophytic characters. The scientific name is derived from the Ancient Greek words ''polys'', meaning "many", and ''thrix'', meaning "hair". This name was used in ancient times to refer to plants with fine, hairlike parts, including mosses, but this application specifically refers to the hairy calyptras found on young sporophytes. A similar naming related to hair appears in Old Norse, ''haddr silfjar'', "hair of Sif", goddess from Norse Mythology, wife of the god Thor. There are two major sections of ''Polytrichum'' species. The first — section ''Polytrichum'' — has narrow, toothed, and relatively erect leaf margins. The other — section ''Juniperifolia'' — has broad, entire, and sharply inflexed leaf margins that enclose the lamellae on the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
