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Yellow-headed Amazon
The yellow-headed amazon (''Amazona oratrix''), also known as the yellow-headed parrot and double yellow-headed amazon, is an endangered amazon parrot of Mexico and northern Central America. Measuring in length, it is a stocky short-tailed green parrot with a yellow head. It prefers to live in mangrove forests or forests near rivers or other bodies of water. It is sometimes considered a subspecies of the yellow-crowned amazon (''Amazona ochrocephala''). It is a popular pet and an excellent talker. Poaching for the international pet trade has driven the species to near-extinction in the wild; around half of all wild-caught birds are thought to die in the process. Taxonomy This species is part of the ''Amazona ochrocephala'' complex, which also includes the yellow-naped amazon (''A. auropalliata''). This complex, which has been called "a taxonomic headache", is considered a single species by some authorities and split into three species by others. The split is mainly based on the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tres Marías Amazon
The Tres Marías amazon (''Amazona tresmariae'') is an Amazon parrot in the family Psittacidae. Many authorities consider it a subspecies of the yellow-headed amazon (''Amazona oratrix''), including the American Ornithological Society, but is afforded full species status by the International Ornithological Congress. It is endemic to the Islas Marías off the Pacific coast of Mexico. Taxonomy The Tres Marías amazon was formally described in 1900 by the American naturalist Edward William Nelson. He considered it as a subspecies of the yellow-headed amazon (''Amazona oratrix'') and introduced the trinomial name ''Amazona oratrix tresmariae''. Frank Gill, Pamela Rasmussen and David Donsker in the list maintained on behalf of the International Ornithological Committee (IOC) treat the Tres Marías amazon as a full species based on a 2004 study that analysed differences in mitochondrial DNA sequences. Other ornithologists have chosen to retain this parrot as a subspecies. The specie ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gene Flow
In population genetics, gene flow (also known as gene migration or geneflow and allele flow) is the transfer of genetic material from one population to another. If the rate of gene flow is high enough, then two populations will have equivalent allele frequencies and therefore can be considered a single effective population. It has been shown that it takes only "one migrant per generation" to prevent populations from diverging due to drift. Populations can diverge due to selection even when they are exchanging alleles, if the selection pressure is strong enough. Gene flow is an important mechanism for transferring genetic diversity among populations. Migrants change the distribution of genetic diversity among populations, by modifying allele frequencies (the proportion of members carrying a particular variant of a gene). High rates of gene flow can reduce the genetic differentiation between the two groups, increasing homogeneity. For this reason, gene flow has been thought to con ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Puerto Barrios
Puerto Barrios () is a city in Guatemala, located within the Gulf of Honduras. The city is located on Bahia de Amatique. Puerto Barrios is the departmental seat of Izabal department and is the administrative seat of Puerto Barrios municipality. It is Guatemala's main Caribbean Sea port, together with its more modern twin port town just to the southwest, Santo Tomás de Castilla. As of the 2018 census the population of Puerto Barrios was 100,593. Puerto Barrios is located northeast of Guatemala City. It is the terminus of Highway CA9 which begins at the Pacific port city of Puerto San José and traverses the country through Guatemala City. The city's population is a mix of mostly Garifuna, Maya, Afro-Caribbean (such as Afro-Jamaicans), and other West Indian groups. Its heyday was in the latter 19th and early 20th centuries, following the construction of a railroad connecting large banana and coffee plantations with the shipping docks, all controlled by the International Railways ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pacific Ocean
The Pacific Ocean is the largest and deepest of Earth's five oceanic divisions. It extends from the Arctic Ocean in the north to the Southern Ocean (or, depending on definition, to Antarctica) in the south, and is bounded by the continents of Asia and Oceania in the west and the Americas in the east. At in area (as defined with a southern Antarctic border), this largest division of the World Ocean—and, in turn, the hydrosphere—covers about 46% of Earth's water surface and about 32% of its total surface area, larger than Earth's entire land area combined .Pacific Ocean . '' Britannica Concise.'' 2008: Encyclopædia Britannica, Inc. The centers of both the |
Gulf Of Mexico
The Gulf of Mexico ( es, Golfo de México) is an oceanic basin, ocean basin and a marginal sea of the Atlantic Ocean, largely surrounded by the North American continent. It is bounded on the northeast, north and northwest by the Gulf Coast of the United States; on the southwest and south by the Mexico, Mexican States of Mexico, states of Tamaulipas, Veracruz, Tabasco, Campeche, Yucatan, and Quintana Roo; and on the southeast by Cuba. The Southern United States, Southern U.S. states of Texas, Louisiana, Mississippi, Alabama, and Florida, which border the Gulf on the north, are often referred to as the "Third Coast" of the United States (in addition to its Atlantic and Pacific Ocean, Pacific coasts). The Gulf of Mexico took shape approximately 300 million years ago as a result of plate tectonics.Huerta, A.D., and D.L. Harry (2012) ''Wilson cycles, tectonic inheritance, and rifting of the North American Gulf of Mexico continental margin.'' Geosphere. 8(1):GES00725.1, first p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Belize
Belize (; bzj, Bileez) is a Caribbean and Central American country on the northeastern coast of Central America. It is bordered by Mexico to the north, the Caribbean Sea to the east, and Guatemala to the west and south. It also shares a water boundary with Honduras to the southeast. It has an area of and a population of 441,471 (2022). Its mainland is about long and wide. It is the least populated and least densely populated country in Central America. Its population growth rate of 1.87% per year (2018 estimate) is the second-highest in the region and one of the highest in the Western Hemisphere. Its capital is Belmopan, and its largest city is the namesake city of Belize City. Belize is often thought of as a Caribbean country in Central America because it has a history similar to that of English-speaking Caribbean nations. Indeed, Belize’s institutions and official language reflect its history as a British colony. The Maya civilization spread into the area of Beli ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tres Marías Islands
Tres may refer to: * Tres (instrument), a Cuban musical instrument * Tres, Trentino, municipality in Italy * "Tres" (song) by Juanes * "Tres", a song by Líbido from their album ''Hembra'' * TrES, the ''Trans-Atlantic Exoplanet Survey'' * Templi Resurgentes Equites Synarchici, a fictional secret society in the novel ''Foucault's Pendulum'' * MTV Tres, an American cable network which targets programming towards young Hispanic-Americans * Tea Research and Extension Station, Taiwan * ''Tres'' (Fiel a la Vega album), 1999 *Tres (Álvaro Torres album), 1985 * ''Tres'' (poetry collection), a 2000 collection of poems by Roberto Bolaño See also * *Los Tres, Chilean rock band *''TRE3S ''TRE3S'' is the third studio album by Chikita Violenta, released in early 2011, to a mix of mild and enthusiastic reviews. '' Spin'' magazine gave the album 7 out of 10 stars, stating "While the production's scope doesn't quite fit Chikita Vio ...'', 2011 album by Mexican indie rock band Chikita Viole ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Monotypic
In biology, a monotypic taxon is a taxonomic group (taxon) that contains only one immediately subordinate taxon. A monotypic species is one that does not include subspecies or smaller, infraspecific taxa. In the case of genera, the term "unispecific" or "monospecific" is sometimes preferred. In botanical nomenclature, a monotypic genus is a genus in the special case where a genus and a single species are simultaneously described. In contrast, an oligotypic taxon contains more than one but only a very few subordinate taxa. Examples Just as the term ''monotypic'' is used to describe a taxon including only one subdivision, the contained taxon can also be referred to as monotypic within the higher-level taxon, e.g. a genus monotypic within a family. Some examples of monotypic groups are: Plants * In the order Amborellales, there is only one family, Amborellaceae and there is only one genus, '' Amborella'', and in this genus there is only one species, namely ''Amborella trichopoda. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Panama Amazon
The Panama amazon, also known as the Panama yellow-headed amazon, (''Amazona ochrocephala panamensis'') is a subspecies of the yellow-crowned amazon, and is endemic to Panama (including the Pearl Islands and Coiba) and northwest Colombia. In aviculture, it is sometimes listed as a separate species (''Amazona panamensis''), and this is potentially correct; at least as a phylogenetic species. Description Adults are approximately in length, are bright green with a yellow area on the forehead, and a horn-colored (gray) beak, sometimes with a dark tip, but lacking the reddish coloring on the upper mandible that is present in the nominate yellow-crowned amazon. Lexicon of Parrots, online version. Arndt-Verlag. Accessed 16 February 2010. The plumage of the body is g ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phylogenetic Nomenclature
Phylogenetic nomenclature is a method of nomenclature for taxa in biology that uses phylogenetic definitions for taxon names as explained below. This contrasts with the traditional approach, in which taxon names are defined by a '' type'', which can be a specimen or a taxon of lower rank, and a description in words. Phylogenetic nomenclature is currently regulated by the '' International Code of Phylogenetic Nomenclature'' (''PhyloCode''). Definitions Phylogenetic nomenclature ties names to clades, groups consisting of an ancestor and all its descendants. These groups can equivalently be called monophyletic. There are slightly different ways of specifying the ancestor, which are discussed below. Once the ancestor is specified, the meaning of the name is fixed: the ancestor and all organisms which are its descendants are included in the named taxon. Listing all these organisms (i.e. providing a full circumscription) requires the full phylogenetic tree to be known. In practice, ther ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Clades
A clade (), also known as a monophyletic group or natural group, is a group of organisms that are monophyletic – that is, composed of a common ancestor and all its lineal descendants – on a phylogenetic tree. Rather than the English term, the equivalent Latin term ''cladus'' (plural ''cladi'') is often used in taxonomical literature. The common ancestor may be an individual, a population, or a species (extinct or extant). Clades are nested, one in another, as each branch in turn splits into smaller branches. These splits reflect evolutionary history as populations diverged and evolved independently. Clades are termed monophyletic (Greek: "one clan") groups. Over the last few decades, the cladistic approach has revolutionized biological classification and revealed surprising evolutionary relationships among organisms. Increasingly, taxonomists try to avoid naming taxa that are not clades; that is, taxa that are not monophyletic. Some of the relationships between organisms t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Biological Species
In biology, a species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriate sexes or mating types can produce fertile offspring, typically by sexual reproduction. Other ways of defining species include their karyotype, DNA sequence, morphology, behaviour or ecological niche. In addition, paleontologists use the concept of the chronospecies since fossil reproduction cannot be examined. The most recent rigorous estimate for the total number of species of eukaryotes is between 8 and 8.7 million. However, only about 14% of these had been described by 2011. All species (except viruses) are given a two-part name, a "binomial". The first part of a binomial is the genus to which the species belongs. The second part is called the specific name or the specific epithet (in botanical nomenclature, also sometimes in zoological ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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