نتایج جستجو برای: molecular phylogenetics

تعداد نتایج: 655071  

Journal: :Zootaxa 2015
Guang Hui Zhong Wen De Chen Qin Liu Fei Zhu Pei Hao Peng Peng Guo

Plagiopholis unipostocularis Zhao, Jiang & Huang, 1978 is a small snake endemic to Yunnan, southern China. Its validity is still controversial and unresolved. Based on extensive sampling in Yunnan, we conducted morphological comparison and molecular phylogenetics on the unidentified specimens of Plagiopholis from Yunnan. Based on a combination of morphological comparison and molecular phylogeny...

2006
Mehrdad Hajibabaei Donal A. Hickey

DNA barcoding has been recently promoted as a method for both assigning specimens to known species and for discovering new and cryptic species. Here we test both the potential and the limitations of DNA barcodes by analysing a group of well-studied organisms—the primates. Our results show that DNA barcodes provide enough information to efficiently identify and delineate primate species, but tha...

Journal: :Statistical applications in genetics and molecular biology 2014
Sarah E Heaps Tom M W Nye Richard J Boys Tom A Williams T Martin Embley

In molecular phylogenetics, standard models of sequence evolution generally assume that sequence composition remains constant over evolutionary time. However, this assumption is violated in many datasets which show substantial heterogeneity in sequence composition across taxa. We propose a model which allows compositional heterogeneity across branches, and formulate the model in a Bayesian fram...

Journal: :Philosophical Transactions of the Royal Society B: Biological Sciences 2008
Nick Goldman Ziheng Yang

1. INTRODUCTION Since the widespread acceptance of Darwin's theory of evolution (Darwin 1859), scientists have been interested in reconstructing the evolutionary relationships of living (and extinct) organisms. Evolution occurs too slowly to be experimented upon in situ in any but the most extreme cases, and scientists must look for information in the contemporary world that can lead to insight...

Journal: :Molecular phylogenetics and evolution 2010
Bryn T M Dentinger Joseph F Ammirati Ernst E Both Dennis E Desjardin Roy E Halling Terry W Henkel Pierre-Arthur Moreau Eiji Nagasawa Kasem Soytong Andy F Taylor Roy Watling Jean-Marc Moncalvo David J McLaughlin

Porcini (Boletus section Boletus: Boletaceae: Boletineae: Boletales) are a conspicuous group of wild, edible mushrooms characterized by fleshy fruiting bodies with a poroid hymenophore that is "stuffed" with white hyphae when young. Their reported distribution is with ectomycorrhizal plants throughout the Northern Hemisphere. Little progress has been made on the systematics of this group using ...

Journal: :Trends in ecology & evolution 2015
R Alexander Pyron

The time is past when a research program in systematics should be based on only a few genes, extant taxa, and ultrametric trees. Cheap genome sequencing, powerful statistical methods, and new fossil discoveries promise to reinvigorate research programs in evolutionary biology. Population genetics, phylogeography, and species delimitation all benefit from genomic data, not just tree building alo...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2002
Yoshiyuki Suzuki Galina V Glazko Masatoshi Nei

Bayesian phylogenetics has recently been proposed as a powerful method for inferring molecular phylogenies, and it has been reported that the mammalian and some plant phylogenies were resolved by using this method. The statistical confidence of interior branches as judged by posterior probabilities in Bayesian analysis is generally higher than that as judged by bootstrap probabilities in maximu...

Journal: :J. Parallel Distrib. Comput. 2003
Heiko A. Schmidt Ekkehard Petzold Martin Vingron Arndt von Haeseler

Exponential growth of the data available for molecular sequence analysis causes eminent need for methods to analyze large datasets in reasonable time. In molecular phylogenetics maximum-likelihood methods became very popular despite their vast need for computational power. During the last decades parallel computing has proven to be a valuable way to decrease running time of computationally inte...

2016
Nicola Harrison Richard J Harrison Catherine A Kidner

Recent, rapid radiations make species-level phylogenetics difficult to resolve. We used a multiplexed, high-throughput sequencing approach to identify informative genomic regions to resolve phylogenetic relationships at low taxonomic levels in Begonia from a survey of sixteen species. A long-range PCR method was used to generate draft plastid genomes to provide a strong phylogenetic backbone, i...

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