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Statements

Subject Item
dbr:Evolution_of_lemurs
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Evolution of lemurs Histoire évolutive des lémuriformes História evolutiva dos lémures تاريخ تطور الليمور
rdfs:comment
A história evolutiva dos lémures ocorreu em isolamento de outros primatas, na ilha de Madagáscar, durante pelo menos 40 milhões de anos. Os lémures são primatas prossímios que pertencem à subordem Strepsirrhini, que se separou dos outros primatas há menos de 63 milhões de anos. Partilham algumas características com os primatas mais basais e por tal são muitas vezes confundidos como sendo ancestrais aos primatas mais evoluídos incluindo os humanos. Pelo contrário, apenas meramente se assemelham com primatas ancestrais. التاريخ النشوئي للليموريات حدث في معزل عن باقي الرئيسيات، علي جزيرة مدغشقر، علي الأقل من 40 مليون سنة. الليموريات رئيسيات من سعالي بدائية من رتبية الهباريات، التي تشعبت من الرئيسيات لأقل من 63 مليون سنة ماضية. تتشارك في العديد من السمات من الرئيسيات القاعدية، ولذلك كثيراً ما أحتير بكونها سلف السعادين الحديثة، والقردة، والبشر. بدلاً من ذلك، هي تشبهة أسلاف الرئيسيات فقط. يعتقد أن نشوء الليموريات كان خلال العصر الإيوسين أو في مبكر، يتشاركون أقرب الأسلاف مع اللوريسيات، والبوتو، والجلاجو الحفريات من أفريقيا وبعض اختبارات الأحماض النووية أقترحت أن الليموريات قد شقت طرقها إلي مدغشقر فيما بين 40 و52 م.س.م. مقارنات الميتوكندريات الأخري وتسلسل الأحماض النووية تقدم نطاق وقتي من 62 إلي 65 م.س.م. Lemurs, primates belonging to the suborder Strepsirrhini which branched off from other primates less than 63 million years ago, evolved on the island of Madagascar, for at least 40 million years. They share some traits with the most basal primates, and thus are often confused as being ancestral to modern monkeys, apes, and humans. Instead, they merely resemble ancestral primates. L'histoire évolutive des lémuriformes s'est déroulée indépendamment de celle des autres primates, après leur isolement sur l'île de Madagascar, depuis au moins 40 Ma. Les lémuriformes ou lémuriens sont des primates prosimiens appartenant au sous-ordre des strepsirrhiniens qui bifurqua des autres primates il y a environ 63 Ma. Ils partagent certains traits avec les premiers primates et sont donc souvent considérés à tort comme les ancêtres des singes actuels et des humains. En fait, ils ressemblent simplement aux primates ancestraux.
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Lemurs
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There are two competing lemur phylogenies, one by Horvath et al. and one by Orlando et al. . Note that Horvath et al. did not attempt to place the subfossil lemurs.
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30
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Madagascar Primates Evolutionary biology
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Competing lemur phylogenies
dbo:abstract
Lemurs, primates belonging to the suborder Strepsirrhini which branched off from other primates less than 63 million years ago, evolved on the island of Madagascar, for at least 40 million years. They share some traits with the most basal primates, and thus are often confused as being ancestral to modern monkeys, apes, and humans. Instead, they merely resemble ancestral primates. Lemurs are thought to have evolved during the Eocene or earlier, sharing a closest common ancestor with lorises, pottos, and galagos (lorisoids). Fossils from Africa and some tests of nuclear DNA suggest that lemurs made their way to Madagascar between 40 and 52 mya. Other mitochondrial and nuclear DNA sequence comparisons offer an alternative date range of 62 to 65 mya. An ancestral lemur population is thought to have inadvertently rafted to the island on a floating mat of vegetation, although hypotheses for land bridges and island hopping have also been proposed. The timing and number of hypothesized colonizations has traditionally hinged on the phylogenetic affinities of the aye-aye, the most basal member of the lemur clade. Having undergone their own independent evolution on Madagascar, lemurs have diversified to fill many niches normally filled by other types of mammals. They include the smallest primates in the world, and once included some of the largest. Since the arrival of humans approximately 2,000 years ago, lemurs are now restricted to 10% of the island, or approximately 60,000 square kilometers (23,000 square miles), with many facing extinction. L'histoire évolutive des lémuriformes s'est déroulée indépendamment de celle des autres primates, après leur isolement sur l'île de Madagascar, depuis au moins 40 Ma. Les lémuriformes ou lémuriens sont des primates prosimiens appartenant au sous-ordre des strepsirrhiniens qui bifurqua des autres primates il y a environ 63 Ma. Ils partagent certains traits avec les premiers primates et sont donc souvent considérés à tort comme les ancêtres des singes actuels et des humains. En fait, ils ressemblent simplement aux primates ancestraux. On considère que l'évolution des lémuriens, en tant que tels, a commencé au cours de l'Éocène, ou même plus tôt, partageant un proche ancêtre commun avec les lorisiformes. Les fossiles du continent africain et certaines études sur l'ADN nucléaire suggèrent que les lémuriens sont arrivés à Madagascar il y a 40 à 52 Ma mais d'autres recherches en phylogénie moléculaire, notamment sur le génome mitochondrial donnent une période plus ancienne, se situant entre il y a 62 à 65 Ma. L'hypothèse la plus probable de leur origine sur l'île est qu'une population de lémuriens primitifs aurait traversé le canal du Mozambique, emportée depuis l'Afrique par un radeau de végétation, même si des hypothèses de ponts terrestres et de passage d'île en île ont également été proposées. La période et le nombre hypothétique de colonisations sont traditionnellement basés sur les affinités phylogénétiques de l'aye-aye, le membre de loin le plus primitif du clade des lémuriens malgaches. Évoluant seuls sur Madagascar, les lémuriens se sont diversifiés jusqu'à occuper de nombreuses niches écologiques normalement remplies par d'autres types de mammifères. Ils comprennent les plus petits primates au monde et comprenaient autrefois certains des plus grands. Depuis l'arrivée des humains, il y a 2 000 ans environ, ils ont vu leur territoire progressivement limité à 10 % de l'île, soit environ 60 000 km2, et beaucoup sont menacés d'extinction. Pour cette raison, les chercheurs ont essayé d'identifier et d'évaluer toutes les espèces. Depuis les années 1980, il y a eu une forte augmentation du nombre d'espèces et de sous-espèces de lémuriens reconnues, à la fois par la découverte de nouvelles espèces et l'élévation de sous-espèces existantes au niveau d'espèces à part entière. En 2011, on compte près d'une centaine d'espèces ou sous-espèces de lémuriens qui sont divisées en cinq familles et quinze genres. Si les lémuriens subfossiles éteints y étaient inclus, il faudrait y ajouter trois autres familles, huit genres et dix-sept espèces. Cette augmentation du nombre d'espèces est à la fois due à l'amélioration de l'analyse génétique mais aussi à la volonté d'encourager la protection des populations de lémuriens. Toute la communauté scientifique n'appuie pas ces changements taxonomiques, certains préférant une estimation de 50 espèces vivantes. التاريخ النشوئي للليموريات حدث في معزل عن باقي الرئيسيات، علي جزيرة مدغشقر، علي الأقل من 40 مليون سنة. الليموريات رئيسيات من سعالي بدائية من رتبية الهباريات، التي تشعبت من الرئيسيات لأقل من 63 مليون سنة ماضية. تتشارك في العديد من السمات من الرئيسيات القاعدية، ولذلك كثيراً ما أحتير بكونها سلف السعادين الحديثة، والقردة، والبشر. بدلاً من ذلك، هي تشبهة أسلاف الرئيسيات فقط. يعتقد أن نشوء الليموريات كان خلال العصر الإيوسين أو في مبكر، يتشاركون أقرب الأسلاف مع اللوريسيات، والبوتو، والجلاجو الحفريات من أفريقيا وبعض اختبارات الأحماض النووية أقترحت أن الليموريات قد شقت طرقها إلي مدغشقر فيما بين 40 و52 م.س.م. مقارنات الميتوكندريات الأخري وتسلسل الأحماض النووية تقدم نطاق وقتي من 62 إلي 65 م.س.م. A história evolutiva dos lémures ocorreu em isolamento de outros primatas, na ilha de Madagáscar, durante pelo menos 40 milhões de anos. Os lémures são primatas prossímios que pertencem à subordem Strepsirrhini, que se separou dos outros primatas há menos de 63 milhões de anos. Partilham algumas características com os primatas mais basais e por tal são muitas vezes confundidos como sendo ancestrais aos primatas mais evoluídos incluindo os humanos. Pelo contrário, apenas meramente se assemelham com primatas ancestrais. Pensa-se que os lémures tenham evoluído durante o Eocénico ou mais cedo, partilhando um ancestral comum mais próximo com os lorisiformes. fósseis em África e testes com uso de DNA nuclear sugerem que os lémures fizeram o seu caminho até Madagáscar há entre 40 e 52 milhões de anos. Pensa-se que uma população ancestral de lémures tenha inadvertidamente chegado à ilha através de dispersão do tipo rafting, através de uma porção de vegetação flutuante. As hipóteses de ponte terrestre e migração de ilha em ilha também foram propostas. A altura e número de colonizações hipotéticas têm tradicionalmente articulado com as afinidades filogenéticas do aie-aie (Daubentonia madagascarienses), o membro mais basal do clade dos lémures. Tendo sofrido a sua evolução independente em Madagáscar, os lémures diversificaram-se e preencheram muitos nichos ecológicos normalmente ocupados por outros tipos de mamíferos. Os lémures incluem os mais pequenos primatas do mundo, tendo antigamente também possuído alguns dos maiores. Desde a chegada dos seres humanos, há cerca de dois mil anos, eles estão restritos a apenas 10% da ilha, ou aproximadamente 60 mil quilómetros quadrados. Muitos deles estão ameaçados de extinção. Por esta razão, pesquisadores têm tentado identificar e estudar cada espécie. Nos últimos 10 a 20 anos, têm havido um crescimento acentuado no número de , quer através de descoberta de novas espécies quer à elevação de subespécies ao estatuto de espécie. Actualmente existem cerca de 100 ou mais espécies e subespécies reconhecidas de lémures extantes, divididas em cinco famílias e 15 géneros. Se os lémures subfósseis estiverem incluídos, seriam contadas mais três famílias, oito géneros e 17 espécies. O recente aumento no número de espécies é devido a análises genéticas melhoradas e à incentivo conservacionista com vista a encorajar a protecção de populações de lémures isoladas e distintas. Nem toda a comunidade científica apoia estas mudanças taxonómicas, com alguns a preferirem estimar o número de espécies em 50.
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