Despite the recent flurry of books addressing virtually every aspect of speciation (Schluter 2000; Coyne and Orr 2004; Gavrilets 2004), the primary literature on speciation has lately been dominated by genetics, led, many would agree, by laboratory studies on Drosophila. To many this trend is a welcome, long-awaited marriage of genomics and classical genetics, an elaboration of the foundation l...

9 We analyze the joint evolution of an ecological character and of dispersal distance in asex10 ual and sexual populations inhabiting an environmental gradient. Several interesting 11 phenomena resulting from the evolutionary interplay of these characters are revealed. First, 12 asexual and sexual populations exhibit two analogous evolutionary regimes, in which either 13 speciation in the ecolo...

The view of species as entities subjected to natural selection and amenable to change put forth by Charles Darwin and Alfred Wallace laid the conceptual foundation for understanding speciation. Initially marred by a rudimental understanding of hereditary principles, evolutionists gained appreciation of the mechanistic underpinnings of speciation following the merger of Mendelian genetic princip...

Using a weak migration and weak mutation approximation, I study the average waiting time to and the average duration of parapatric speciation. The description of reproductive isolation used is based on the classical Dobzhansky model and its recently proposed multilocus generalizations. The dynamics of parapatric speciation is modeled as a biased random walk with absorption performed by the aver...

the concentrations and speciation of mo, together with fe, cu, and zn, in nver river sediments impacted with mo mining activities in western liaoning, northeast china, were investigated withgeochemical method. using the x-ray fluorescence and x-ray diffraction, the characterizations of metals in tailings ponds deposited along the nver river bank were analyzed. analysis and comparison of the con...

The idea that selection may be fundamental to the origin of species dates back at least to the synthesis of modern evolutionary theory, being present in the writings of Fisher (1930), Muller (1942), and Dobzhansky (1951). Nevertheless, despite almost three-quarters of a century since the idea was first proposed, little progress has been made in testing the role of selection in speciation (Coyne...

The past 20 years have seen a renaissance in the study of speciation. At the core of this research endeavor is the study of ecological speciation, and substantial evidence has been marshaled revealing that much of the world's biodiversity arises through this process (Seehausen, 2006; Schluter, 2009). Ecological speciation comes about when selection that differs between contrasting environments ...

The last decade has brought renewed interest in the genetics of speciation, yielding a number of new models and empirical results. Defining speciation as 'the origin of reproductive isolation between two taxa', we review recent theoretical studies and relevant data, emphasizing the regular patterns seen among genetic analyses. Finally, we point out some important and tractable questions about s...

This article presents a review of the analytical relevance of trace metal speciation analysis, which must be considered in environmental and biophysicochemical systems for reliable and efficient assessment and monitoring of trace metals. Examples are given of methodological approaches used for speciation analysis. An overview of speciation analysis in sediments, aquatic ecosystems and agrosyste...

These expectations are now fulfilled by the Handbook of Elemental Speciation. . . .The first volume brings together a collection of chapters covering comprehensively different aspects of procedures for speciation analysis at the different levels starting from sample collection and storage, through sample preparation approaches to render the species chromatographable, principles of separation te...