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Cape Siskin
The Cape siskin (''Crithagra totta'') is a small passerine bird in the finch family. It is an endemic resident breeder in the southern Cape Province of South Africa. This locally common but shy and unobtrusive siskin is found in the southwestern and southern Cape's rocky slopes, coastal cliffs and fynbos-covered mountains. It also occurs in towns and the suburbs of Cape Town. Taxonomy and systematics The Cape siskin was formerly placed in the genus ''Serinus'' but phylogenetic analysis using mitochondrial and nuclear DNA sequences found that the genus was polyphyletic. The genus was therefore split and a number of species including the Cape siskin were moved to the resurrected genus ''Crithagra''. The Cape siskin is closely related to the Drakensberg siskin, and the two have sometimes been treated as conspecific. Description The Cape siskin averages 13 cm in length. The flight feathers and tail have white spots on the tips which are diagnostic for both sexes, and especial ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anders Erikson Sparrman
Anders Sparrman (27 February 1748, Tensta, Uppland – 9 August 1820) was a Swedish naturalist, abolitionist and an apostle of Carl Linnaeus. Biography left, Miniature of Sparrman at the time of his travels with James Cook. By unknown artist. Sparrman was the son of a clergyman. At the age of nine he enrolled at Uppsala University, beginning medical studies at fourteen and becoming one of the outstanding pupils of Linnaeus. In 1765 he went on a voyage to China as ship's doctor, returning two years later and describing the animals and plants he had encountered. On this voyage he met Carl Gustaf Ekeberg. He sailed for the Cape of Good Hope in January 1772 to take up a post as a tutor. When James Cook arrived there later in the year at the start of his second voyage, Sparrman was taken on as assistant naturalist to Johann and Georg Forster. After the voyage he returned to Cape Town in July 1775 and practiced medicine, earning enough to finance a journey into the interior. He wa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Serinus
''Serinus'' is a genus of small birds in the finch family Fringillidae found in Europe and Africa. The birds usually have some yellow in their plumage. The genus was introduced in 1816 by the German naturalist Carl Ludwig Koch. Its name is New Latin for "canary-yellow". Many species were at one time assigned to the genus but it became clear from phylogenetic studies of mitochondrial and nuclear DNA sequences that the genus was polyphyletic. This was confirmed by Dario Zuccon and coworkers in a comprehensive study of the finch family published in 2012. The authors suggested splitting the genus into two monophyletic groups, a proposal that was accepted by the International Ornithologists' Union. The genus ''Serinus'' was restricted to the European serin and seven other species while a larger clade from Africa and Arabia was assigned to the resurrected genus ''Crithagra ''Crithagra'' is a genus of small passerine birds in the finch family (Fringillidae). They live in Africa and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Endemic Birds Of South Africa
Endemism is the state of a species being found in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also found elsewhere. For example, the Cape sugarbird is found exclusively in southwestern South Africa and is therefore said to be ''endemic'' to that particular part of the world. An endemic species can be also be referred to as an ''endemism'' or in scientific literature as an ''endemite''. For example '' Cytisus aeolicus'' is an endemite of the Italian flora. '' Adzharia renschi'' was once believed to be an endemite of the Caucasus, but it was later discovered to be a non-indigenous species from South America belonging to a different genus. The extreme opposite of an endemic species is one with a cosmopolitan distribution, having a global or widespread range. A rare alternative term for a species that is endemic is "precinctive", which applies to s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cape Point
Cape Point ( af, Kaappunt) is a promontory at the southeast corner of the Cape Peninsula, a mountainous and scenic landform that runs north-south for about thirty kilometres at the extreme southwestern tip of the African continent in South Africa. Table Mountain and the city of Cape Town are close to the northern extremity of the same peninsula. The cape is located at , about 2.3 kilometres (1.4 mi) east and a little north of the Cape of Good Hope on the southwest corner. Although these two rocky capes are very well known, neither cape is actually the southernmost point of the mainland of Africa; that is Cape Agulhas, approximately to the east-southeast. Peaks The peak above Cape Point is higher than that above the Cape of Good Hope. The rugged sandstone (Table Mountain sandstone) ridge that rises from Cape Point at sea level develops into two peaks. There is a major peak that dominates the skyline locally, but there is also a smaller peak about 100 m (328 ft) furthe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Yellow-fronted Canary
The yellow-fronted canary (''Crithagra mozambica'') is a small passerine bird in the finch family. It is sometimes known in aviculture as the green singing finch. The yellow-fronted canary was formerly placed in the genus ''Serinus'', but phylogenetic analysis using mitochondrial and nuclear DNA sequences found that genus to be polyphyletic. The genus was therefore split and a number of species including the yellow-fronted canary were moved to the resurrected genus ''Crithagra'' Swainson 1827. This bird is a resident breeder in Africa south of the Sahara Desert. Its habitat is open woodland and cultivation. It nests in trees, laying three or four eggs in a compact cup nest. It has been introduced to the Hawaiian Islands, where it is found on western Hawaii, southeastern Oahu and Molokai. The yellow-fronted canary is a common, gregarious seedeater. It is 11–13 cm in length. The adult male has a green back and brown wings and tail. The underparts and rump are yellow, and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Conspecific
Biological specificity is the tendency of a characteristic such as a behavior or a biochemical variation to occur in a particular species. Biochemist Linus Pauling stated that "Biological specificity is the set of characteristics of living organisms or constituents of living organisms of being special or doing something special. Each animal or plant species is special. It differs in some way from all other species...biological specificity is the major problem about understanding life." Biological specificity within ''Homo sapiens'' ''Homo sapiens'' has many characteristics that show the biological specificity in the form of behavior and morphological traits. Morphologically, humans have an enlarged cranial capacity and more gracile features in comparison to other hominins. The reduction of dentition is a feature that allows for the advantage of adaptability in diet and survival. As a species, humans are culture dependent and much of human survival relies on the culture and so ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Drakensberg Siskin
The Drakensberg siskin (''Crithagra symonsi'') is a small passerine bird in the finch family. It is an endemic resident breeder in the eastern Cape Province Transkei and western Natal in South Africa, and in Lesotho. This species is sometimes considered to be conspecific with the Cape siskin (''Crithagra totta'') of southern Cape Province, in which case the nominate western form is ''C. t. totta'', and the eastern form is ''C. t. symonsi''. This locally common but shy and unobtrusive siskin is found in the scrubby valleys and hillsides of the Drakensberg mountains. Taxonomy The Drakensberg siskin was formerly placed in the genus ''Serinus'' but phylogenetic analysis using mitochondrial and nuclear DNA sequences found that the genus was polyphyletic. The genus was therefore split and a number of species including the Drakensberg siskin were moved to the resurrected genus ''Crithagra''. Description The Drakensberg siskin averages 13–14 cm in length. The tail has white sid ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Crithagra
''Crithagra'' is a genus of small passerine birds in the finch family (Fringillidae). They live in Africa and Arabia. The species in this genus were formerly assigned to the genus ''Serinus'', but phylogenetic analysis of mitochondrial and nuclear DNA sequences found that the genus was polyphyletic. It was therefore split into two monophyletic genera. Eight species, including the European serin (''Serinus serinus''), were retained in ''Serinus'', while the other species were assigned to the resurrected genus ''Crithagra''. The genus was introduced in 1827 by the English ornithologist William John Swainson. The type species was subsequently designated as the brimstone canary. The name comes from the classical Greek ''krithē'' for "barley" and ''agra'' for "hunting". The genus contains 37 species: *Príncipe seedeater, ''Crithagra rufobrunnea'' *São Tomé grosbeak, ''Crithagra concolor'' * African citril, ''Crithagra citrinelloides'' *Western citril, ''Crithagra frontalis'' *Sou ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Polyphyletic
A polyphyletic group is an assemblage of organisms or other evolving elements that is of mixed evolutionary origin. The term is often applied to groups that share similar features known as homoplasies, which are explained as a result of convergent evolution. The arrangement of the members of a polyphyletic group is called a polyphyly .. ource for pronunciation./ref> It is contrasted with monophyly and paraphyly. For example, the biological characteristic of warm-bloodedness evolved separately in the ancestors of mammals and the ancestors of birds; "warm-blooded animals" is therefore a polyphyletic grouping. Other examples of polyphyletic groups are algae, C4 photosynthetic plants, and edentates. Many taxonomists aim to avoid homoplasies in grouping taxa together, with a goal to identify and eliminate groups that are found to be polyphyletic. This is often the stimulus for major revisions of the classification schemes. Researchers concerned more with ecology than with systema ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mitochondrial
A mitochondrion (; ) is an organelle found in the cells of most Eukaryotes, such as animals, plants and fungi. Mitochondria have a double membrane structure and use aerobic respiration to generate adenosine triphosphate (ATP), which is used throughout the cell as a source of chemical energy. They were discovered by Albert von Kölliker in 1857 in the voluntary muscles of insects. The term ''mitochondrion'' was coined by Carl Benda in 1898. The mitochondrion is popularly nicknamed the "powerhouse of the cell", a phrase coined by Philip Siekevitz in a 1957 article of the same name. Some cells in some multicellular organisms lack mitochondria (for example, mature mammalian red blood cells). A large number of unicellular organisms, such as microsporidia, parabasalids and diplomonads, have reduced or transformed their mitochondria into other structures. One eukaryote, ''Monocercomonoides'', is known to have completely lost its mitochondria, and one multicellular organism, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Genus
Genus ( plural genera ) is a taxonomic rank used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In the hierarchy of biological classification, genus comes above species and below family (taxonomy), family. In binomial nomenclature, the genus name forms the first part of the binomial species name for each species within the genus. :E.g. ''Panthera leo'' (lion) and ''Panthera onca'' (jaguar) are two species within the genus ''Panthera''. ''Panthera'' is a genus within the family Felidae. The composition of a genus is determined by taxonomy (biology), taxonomists. The standards for genus classification are not strictly codified, so different authorities often produce different classifications for genera. There are some general practices used, however, including the idea that a newly defined genus should fulfill these three criteria to be descriptively useful: # monophyly – all descendants ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Passerine
A passerine () is any bird of the order Passeriformes (; from Latin 'sparrow' and '-shaped'), which includes more than half of all bird species. Sometimes known as perching birds, passerines are distinguished from other orders of birds by the arrangement of their toes (three pointing forward and one back), which facilitates perching. With more than 140 families and some 6,500 identified species, Passeriformes is the largest clade of birds and among the most diverse clades of terrestrial vertebrates, representing 60% of birds.Ericson, P.G.P. et al. (2003Evolution, biogeography, and patterns of diversification in passerine birds ''J. Avian Biol'', 34:3–15.Selvatti, A.P. et al. (2015"A Paleogene origin for crown passerines and the diversification of the Oscines in the New World" ''Molecular Phylogenetics and Evolution'', 88:1–15. Passerines are divided into three clades: Acanthisitti (New Zealand wrens), Tyranni (suboscines), and Passeri (oscines or songbirds). The passeri ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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