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Black-headed Siskin
The black-headed siskin (''Spinus notatus''), also known as the Jonny Bee, is a species of finch in the family Fringillidae. It is found in Mexico, Belize, El Salvador, Guatemala, Honduras, and Nicaragua. Its natural habitats are subtropical or tropical moist montane forest and heavily degraded former forest. Evolution and systematics This species is part of a rapid recent adaptive radiation of '' Spinus'' finches in Central and South America, which produced at least eight other recognized species: '' S. atratus'', '' S. crassirostris'', '' S. spinescens'', '' S. yarrellii'', '' S. magellanicus'', '' S. olivaceus'', '' S. xanthogastrus'', and '' S. barbatus.'' The black-headed siskin was the earliest of these species to diverge. It was originally proposed that the radiation occurred around 3.5 million years ago, when an ancestral form, perhaps similar to the modern-day black-headed siskin, was able to adaptively radiate into South America. In this version of events, the d ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bernard Du Bus De Gisignies
Bernard Amé Léonard du Bus de Gisignies (21 June 1808 in Saint-Josse-ten-Noode – 6 July 1874 in Bad Ems) was a Dutch nobleman and later on a Belgian politician, ornithologist and paleontologist. He was the second son of Leonard Pierre Joseph du Bus de Gisignies. He married ''Petronilla Truyts'' on 19 May 1845, together they had two children; Viscount Bernard Daniel (Saint-Josse-ten-Noode, 7 October 1832 - Brussels, 17 February 1917) and Viscount Chretien (Saint-Josse-ten-Noode, 4 November 1845 - Jabbeke, 3 July 1883). He studied law at the State University of Louvain, but soon became more interested in ornithology. In 1835 he presented a manuscript to the Royal Academy of Belgium in which described the bird '' Leptorhynchus pectoralis'' (the banded stilt). He was a member of parliament for Soignies. He became the first director of the Royal Belgian Institute of Natural Sciences in 1846. On this occasion he donated 2474 birds from his own collection to the museum. In 1860, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spinus Magellanicus
The hooded siskin (''Spinus magellanicus'') is a small passerine bird in the finch family ( Fringillidae), native to South America. It belongs to the putative clade of neotropical siskins in the genus '' Spinus sensu lato''. There are 11 subspecies, including the Santa Cruz hooded siskin (''S. m. santaecrucis'') of central and eastern Bolivia. This subspecies is sometimes considered to be a separate species. Description Hooded siskins are 10 to 14 cm in length. The male is largely green above and yellow below with a black head. It has a narrow yellow collar and a yellow rump. The tail is black with yellow sides to the base and the wings are black with a broad yellow band. Females are duller with a green-brown head, yellow-green breast and sides and a whitish belly. The twittering song may be uttered from a perch or in flight. It is varied and fast, and may contain imitations of other birds. Distribution and ecology It inhabits woodland, savannas, scrubland, farmland, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Birds Described In 1847
Birds are a group of warm-blooded vertebrates constituting the class Aves (), characterised by feathers, toothless beaked jaws, the laying of hard-shelled eggs, a high metabolic rate, a four-chambered heart, and a strong yet lightweight skeleton. Birds live worldwide and range in size from the bee hummingbird to the ostrich. There are about ten thousand living species, more than half of which are passerine, or "perching" birds. Birds have whose development varies according to species; the only known groups without wings are the extinct moa and elephant birds. Wings, which are modified forelimbs, gave birds the ability to fly, although further evolution has led to the loss of flight in some birds, including ratites, penguins, and diverse endemic island species. The digestive and respiratory systems of birds are also uniquely adapted for flight. Some bird species of aquatic environments, particularly seabirds and some waterbirds, have further evolved for swimming. Bi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Birds Of Central America
Birds are a group of warm-blooded vertebrates constituting the class Aves (), characterised by feathers, toothless beaked jaws, the laying of hard-shelled eggs, a high metabolic rate, a four-chambered heart, and a strong yet lightweight skeleton. Birds live worldwide and range in size from the bee hummingbird to the ostrich. There are about ten thousand living species, more than half of which are passerine, or "perching" birds. Birds have whose development varies according to species; the only known groups without wings are the extinct moa and elephant birds. Wings, which are modified forelimbs, gave birds the ability to fly, although further evolution has led to the loss of flight in some birds, including ratites, penguins, and diverse endemic island species. The digestive and respiratory systems of birds are also uniquely adapted for flight. Some bird species of aquatic environments, particularly seabirds and some waterbirds, have further evolved for swimming ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Closing Of Panama Isthmus And Spinus-Carduelis Notata South American Evolutive Radiation
Closing may refer to: Business and law * Closing (law), a closing argument, a summation * Closing (real estate), the final step in executing a real estate transaction * Closing (sales), the process of making a sale * Closing a business, the process by which an organization ceases operations Computing * Closing (morphology), in image processing * Finalize (optical discs), the optional last step in the authoring process * CLOSING, a TCP connection state Other uses * Closing a letter or e-mail (see valediction) * "Closing", a song by Enter Shikari from the album '' Take to the Skies'' See also * Closing argument * '' Closing Bell'', CNBC television programs * Closing credits * Closing statement (other) * Closing time (other) * Close (other) * Closed (other) * Closure (other) * Conclusion (other) Conclusion may refer to: Media *Conclusion (music), the ending of a composition * ''Conclusion'' (album), an album by Conflic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Allopatric Speciation
Allopatric speciation () – also referred to as geographic speciation, vicariant speciation, or its earlier name the dumbbell model – is a mode of speciation that occurs when biological populations become geographically isolated from each other to an extent that prevents or interferes with gene flow. Various geographic changes can arise such as the movement of continents, and the formation of mountains, islands, bodies of water, or glaciers. Human activity such as agriculture or developments can also change the distribution of species populations. These factors can substantially alter a region's geography, resulting in the separation of a species population into isolated subpopulations. The vicariant populations then undergo genetic changes as they become subjected to different selective pressures, experience genetic drift, and accumulate different mutations in the separated populations' gene pools. The barriers prevent the exchange of genetic information between th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Andes
The Andes, Andes Mountains or Andean Mountains (; ) are the longest continental mountain range in the world, forming a continuous highland along the western edge of South America. The range is long, wide (widest between 18°S – 20°S latitude), and has an average height of about . The Andes extend from north to south through seven South American countries: Venezuela, Colombia, Ecuador, Peru, Bolivia, Chile, and Argentina. Along their length, the Andes are split into several ranges, separated by intermediate depressions. The Andes are the location of several high plateaus—some of which host major cities such as Quito, Bogotá, Cali, Arequipa, Medellín, Bucaramanga, Sucre, Mérida, El Alto and La Paz. The Altiplano plateau is the world's second-highest after the Tibetan plateau. These ranges are in turn grouped into three major divisions based on climate: the Tropical Andes, the Dry Andes, and the Wet Andes. The Andes Mountains are the highest mountain ra ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pleistocene
The Pleistocene ( , often referred to as the '' Ice age'') is the geological epoch that lasted from about 2,580,000 to 11,700 years ago, spanning the Earth's most recent period of repeated glaciations. Before a change was finally confirmed in 2009 by the International Union of Geological Sciences, the cutoff of the Pleistocene and the preceding Pliocene was regarded as being 1.806 million years Before Present (BP). Publications from earlier years may use either definition of the period. The end of the Pleistocene corresponds with the end of the last glacial period and also with the end of the Paleolithic age used in archaeology. The name is a combination of Ancient Greek grc, label=none, πλεῖστος, pleīstos, most and grc, label=none, καινός, kainós (latinized as ), 'new'. At the end of the preceding Pliocene, the previously isolated North and South American continents were joined by the Isthmus of Panama, causing a faunal interchange between the t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Great American Interchange
The Great American Biotic Interchange (commonly abbreviated as GABI), also known as the Great American Interchange and the Great American Faunal Interchange, was an important late Cenozoic paleozoogeographic biotic interchange event in which land and freshwater fauna migrated from North America via Central America to South America and vice versa, as the volcanic Isthmus of Panama rose up from the sea floor and bridged the formerly separated continents. Although earlier dispersals had occurred, probably over water, the migration accelerated dramatically about 2.7 million years ( Ma) ago during the Piacenzian age. It resulted in the joining of the Neotropic (roughly South American) and Nearctic (roughly North American) biogeographic realms definitively to form the Americas. The interchange is visible from observation of both biostratigraphy and nature ( neontology). Its most dramatic effect is on the zoogeography of mammals, but it also gave an opportunity for reptiles, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
South America
South America is a continent entirely in the Western Hemisphere and mostly in the Southern Hemisphere, with a relatively small portion in the Northern Hemisphere at the northern tip of the continent. It can also be described as the southern Subregion#Americas, subregion of a single continent called Americas, America. South America is bordered on the west by the Pacific Ocean and on the north and east by the Atlantic Ocean; North America and the Caribbean Sea lie to the northwest. The continent generally includes twelve sovereign states: Argentina, Bolivia, Brazil, Chile, Colombia, Ecuador, Guyana, Paraguay, Peru, Suriname, Uruguay, and Venezuela; two dependent territory, dependent territories: the Falkland Islands and South Georgia and the South Sandwich Islands; and one administrative division, internal territory: French Guiana. In addition, the ABC islands (Leeward Antilles), ABC islands of the Kingdom of the Netherlands, Ascension Island (dependency of Saint Helena, Asce ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Adaptive Radiation
In evolutionary biology, adaptive radiation is a process in which organisms diversify rapidly from an ancestral species into a multitude of new forms, particularly when a change in the environment makes new resources available, alters biotic interactions or opens new environmental niches. Starting with a single ancestor, this process results in the speciation and phenotypic adaptation of an array of species exhibiting different morphological and physiological traits. The prototypical example of adaptive radiation is finch speciation on the Galapagos ("Darwin's finches"), but examples are known from around the world. Characteristics Four features can be used to identify an adaptive radiation: #A common ancestry of component species: specifically a ''recent'' ancestry. Note that this is not the same as a monophyly in which ''all'' descendants of a common ancestor are included. #A phenotype-environment correlation: a ''significant'' association between environments and the mor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spinus Barbatus
The black-chinned siskin (''Spinus barbatus'') is a species of finch in the family Fringillidae. Found in Argentina, Chile and the Falkland Islands, its natural habitats are temperate forests and heavily degraded former forest. Description The black-chinned siskin grows to a length of about . The male has the crown and the centre of the upper throat black. The rest of the head and the upper parts of the body are yellowish-olive streaked with black. The rump is yellow and the wings are black with two yellowish bars and a yellow patch on the primary feathers. The underparts are greenish-yellow and the belly is white. The appearance of the female is similar to the male but the colouring is more muted. She lacks the black on head and throat. The head and back are a greyish-olive above with pale yellowish-olive underparts and a whitish belly. The only other bird with which it is likely to be confused is the hooded siskin (''Spinus magellanica''); however, that bird is not found so ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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