نتایج جستجو برای: speciation
تعداد نتایج: 14852 فیلتر نتایج به سال:
Recent theory suggests that the geographic location of island radiations (local accumulation of species diversity due to cladogenesis) can be predicted based on island area and isolation. Crickets are a suitable group for testing these predictions, as they show both the ability to reach some of the most isolated islands in the world, and to speciate at small spatial scales. Despite substantial ...
The development of a complex system depends on the self-coordinated action of a large number of agents, often determining unexpected global behavior. The case of software evolution has great practical importance: knowledge of what is to be considered atypical can guide developers in recognizing and reacting to abnormal behavior. Although the initial framework of a theory of software exists, the...
Several empirical studies put forward sexual selection as an important driving force of sympatric speciation. This idea agrees with recent models suggesting that speciation may proceed by means of divergent Fisherian runaway processes within a single population. Notwithstanding this, the models so far have not been able to demonstrate that sympatric speciation can unfold as a fully adaptive pro...
Speciation is not instantaneous but takes time. The protracted birth-death diversification model incorporates this fact and predicts the often observed slowdown of lineage accumulation toward the present. The mathematical complexity of the protracted speciation model has barred estimation of its parameters until recently a method to compute the likelihood of phylogenetic branching times under t...
Speciation has been a major focus of evolutionary biology research in recent years, with many important advances. However, some of the traditional organising principles of the subject area no longer provide a satisfactory framework, such as the classification of speciation mechanisms by geographical context into allopatric, parapatric and sympatry classes. Therefore, we have asked where speciat...
This report describes the work carried out under the NUK-B project SPECIATION 2007. In 2007, the project partners had two meeting in April and November, organized a NUK seminar on speciation and hot particles. SPECIATION 2007 t mainly focused on two issues on speciation (1) further development of speciation methods for radionuclides, and (2) investigation of speciation of radionuclides in envir...
Several empirical studies put forward sexual selection as an important driving force of sympatric speciation. This idea agrees with recent models suggesting that speciation may proceed by means of divergent Fisherian runaway processes within a single population. Notwithstanding this, the models so far have not been able to demonstrate that sympatric speciation can unfold as a fully adaptive pro...
The Dobzhansky–Muller model posits that incompatibilities between alleles at different loci 5 cause speciation. However, it is known that if the alleles involved in a Dobzhansky–Muller 6 incompatibility (DMI) between two loci are neutral, the resulting reproductive isolation cannot 7 be maintained in the presence of either mutation or gene flow. Here we propose that speciation 8 can emerge thro...
This review provides definitions and examples of chemical speciation, as well as giving details of the differences in speciation between labile and inert systems. By moving from the simple to the complex, starting with simple species distribution calculation methods based on solution structural studies, this review progresses to modeling calculations that are applicable to “real-world” systems....
Contributors: R.F. WHITCOMB, Beltsville: SpiroplasmasIsolation, Identification, and Speciation T. SHIMIZU, Miyazaki: Mycoplasmas-Isolation T. WATANABE, Nagasaki: Mycoplasmas -Isolation from the Oral Cavity J.G. TULLY, Bethesda: Acholeplasmas-Identification and Speciation M. OGATA, Tokyo: Acholeplasmas -Isolation M.C. SHEPARD, Jacksonville: Ureaplasmas-Identification and Speciation K. KOSHIMIZU,...
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