Hybridization among diverging lineages is common in nature. Genomic data provide a
special opportunity to characterize the history of hybridization and the genetic basis of …

The production of extreme or 'transgressive'phenotypes in segregating hybrid populations
has been speculated to contribute to niche divergence of hybrid lineages. Here, we assess …

A fully updated guide to the increasingly prevalent use of molecular data in ecological
studies Molecular ecology is concerned with how molecular biology and population genetics …

Hybrid zones are currently of interest because they offer experimental material for studies of
the characters and processes involved in divergence and speciation. Parapatric su6species …

Genomic scans of multiple populations often reveal marker loci with greatly increased
differentiation between populations. Often this differentiation coincides in space with …

The study of hybrids and their evolutionary significance is often based on a number of tacit
assumptions regarding character expression in hybrids. This article examines …

Enormous strides have been made in the study of polyploidy over the last 20 yr. Here, we
highlight some of these discoveries and note where our understanding of polyploid …

Studies of natural hybridization have generally addressed evolutionary ques-tions using one
of the three following frameworks:(i) taxonomy or systematics (57, 59, 73, 79, 111, 172);(ii) …

Summary 599I. Introduction 599II. Concepts and terminology 600III. Historical background
600IV. Studies of experimental hybrids 6011. Isolating mechanisms 6012. Prezygotic …

Contact zones exemplify a series of stages in speciation. In unimodal hybrid zones
intermediates predominate; in bimodal zones hybrids are rare and parental forms …