首页|Improved mammalian family phylogeny using gap-rare multiple sequence alignment:A timetree of extant placentals and marsupials
Improved mammalian family phylogeny using gap-rare multiple sequence alignment:A timetree of extant placentals and marsupials
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国家科技期刊平台
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The timing of mammalian diversification in relation to the Cretaceous-Paleogene(KPg)mass extinction continues to be a subject of substantial debate.Previous studies have either focused on limited taxonomic samples with available whole-genome data or relied on short sequence alignments coupled with extensive species samples.In the present study,we improved an existing dataset from the landmark study of Meredith et al.(2011)by filling in missing fragments and further generated another dataset containing 120 taxa and 98 exonic markers.Using these two datasets,we then constructed phylogenies for extant mammalian families,providing improved resolution of many conflicting relationships.Moreover,the timetrees generated,which were calibrated using appropriate molecular clock models and multiple fossil records,indicated that the interordinal diversification of placental mammals initiated before the Late Cretaceous period.Additionally,intraordinal diversification of both extant placental and marsupial lineages accelerated after the KPg boundary,supporting the hypothesis that the availability of numerous vacant ecological niches subsequent to the mass extinction event facilitated rapid diversification.Thus,our results support a scenario of placental radiation characterized by both basal cladogenesis and active interordinal divergences spanning from the Late Cretaceous into the Paleogene.
Key Laboratory of Animal Ecology and Conservation Biology,Institute of Zoology,Chinese Academy of Sciences,Beijing 100101,China
University of Chinese Academy of Sciences,Beijing 100049,China
School of Life Sciences,University of Science and Technology of China,Hefei,Anhui 230026,China
College of Life Sciences,Nanjing Normal University,Nanjing,Jiangsu 210023,China
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National Key Research and Development Projects of the Ministry of Science and Technology of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaBeijing Natural Sciences Foundation for Distinguished Young Scholars
国家科技期刊平台
NSTL
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