共查询到20条相似文献，搜索用时 15 毫秒
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Robert J Asher 《BMC evolutionary biology》2007,7(1):108
Background
Recent publications concerning the interordinal phylogeny of placental mammals have converged on a common signal, consisting of four major radiations with some ambiguity regarding the placental root. The DNA data with which these relationships have been reconstructed are easily accessible from public databases; access to morphological characters is much more difficult. Here, I present a graphical web-database of morphological characters focusing on placental mammals, in tandem with a combined-data phylogenetic analysis of placental mammal phylogeny. 相似文献4.
Sophie Beltran Yves Desdevises Julien Portela Jérôme Boissier 《BMC evolutionary biology》2010,10(1):245
Background
Sexual morphological features are known to be associated with the mating systems of several animal groups. However, it has been suggested that morphological features other than sexual characteristics could also be constrained by the mating system as a consequence of negative associations. Schistosomatidae are parasitic organisms that vary in mating system and can thus be used to explore links between the mating system and negative associations with morphological features. 相似文献5.
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Stefan Richter Rudi Loesel Günter Purschke Andreas Schmidt-Rhaesa Gerhard Scholtz Thomas Stach Lars Vogt Andreas Wanninger Georg Brenneis Carmen Döring Simone Faller Martin Fritsch Peter Grobe Carsten M Heuer Sabrina Kaul Ole S Møller Carsten HG Müller Verena Rieger Birgen H Rothe Martin EJ Stegner Steffen Harzsch 《Frontiers in zoology》2010,7(1):1-49
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Background
Annelida is one of the major protostome phyla, whose deep phylogeny is very poorly understood. Recent molecular phylogenies show that Annelida may include groups once considered separate phyla (Pogonophora, Echiurida, and Sipunculida) and that Clitellata are derived polychaetes. SThe "total-evidence" analyses combining morphological and molecular characters have been published for a few annelid taxa. No attempt has yet been made to analyse simultaneously morphological and molecular information concerning the Annelida as a whole. 相似文献12.
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Bacteria belonging to Planctomycetes display several unique morphological and genetic features and are found in a wide variety of habitats on earth. Their ecological roles in these habitats are still poorly understood. Planctomycetes have previously been detected throughout the year on surfaces of the kelp Laminaria hyperborea from southwestern Norway. We aimed to make a detailed investigation of the abundance and phylogenetic diversity of planctomycetes inhabiting these kelp surfaces. 相似文献14.
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Dean C Adams 《BMC evolutionary biology》2010,10(1):72
Background
Parallel evolution can occur when common environmental factors exert similar selective forces on morphological variation in populations in different geographic localities. Competition can also generate morphological shifts, and if competing species co-occur in multiple geographic regions, then repeated instances of competitively-driven morphological divergence (character displacement) can occur. Despite the importance of character displacement for inferring the role of selection in morphological evolution however, replicated instances of sympatric morphological divergence are understudied. 相似文献16.
Yuan Xiong Cathryn Kabacoff Jonathan Franca-Koh Peter N Devreotes Douglas N Robinson Pablo A Iglesias 《BMC systems biology》2010,4(1):33
Background
The ability of a cell to change shape is crucial for the proper function of many cellular processes, including cell migration. One type of cell migration, referred to as amoeboid motility, involves alternating cycles of morphological expansion and retraction. Traditionally, this process has been characterized by a number of parameters providing global information about shape changes, which are insufficient to distinguish phenotypes based on local pseudopodial activities that typify amoeboid motility. 相似文献17.
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Jonathan P Bollback 《BMC bioinformatics》2006,7(1):88-7
Background
Character mapping on phylogenies has played an important, if not critical role, in our understanding of molecular, morphological, and behavioral evolution. Until very recently we have relied on parsimony to infer character changes. Parsimony has a number of serious limitations that are drawbacks to our understanding. Recent statistical methods have been developed that free us from these limitations enabling us to overcome the problems of parsimony by accommodating uncertainty in evolutionary time, ancestral states, and the phylogeny. 相似文献19.
Background
There are few predictions about the directionality or extent of morphological trait (mis)matches between interacting organisms. We review and analyse studies on morphological trait complementarity (e.g. floral tube length versus insect mouthpart length) at the population and species level. 相似文献20.