Ecological processes are central to the formation of new species when barriers to gene flow
(reproductive isolation) evolve between populations as a result of ecologically‐based …

The ecological hypothesis of speciation is that reproductive isolation evolves ultimately as a
consequence of divergent natural selection on traits between environments. Ecological …

The origin of biological diversity, via the formation of new species, can be inextricably linked
to adaptation to the ecological environment. Specifically, ecological processes are central to …

Adaptive radiation is the evolution of diversity within a rapidly multiplying lineage. It can
cause a single ancestral species to differentiate into an impressively vast array of species …

This study draws on data from numerous sources that support the paradigm of natural
hybridization as an important evolutionary process. The review of these data results in a …

The long history of reciprocal transplant studies testing the hypothesis of local adaptation
has shown that populations are often adapted to their local environments. Yet many studies …

Abstract Since Darwin published the “Origin,” great progress has been made in our
understanding of speciation mechanisms. The early investigations by Mayr and Dobzhansky …

The classification of reproductive isolating barriers laid out by Dobzhansky and Mayr has
motivated and structured decades of research on speciation. We argue, however, that this …

Fluctuating asymmetry consists of random deviations from perfect symmetry in populations
of organisms. It is a measure of developmental noise, which reflects a population's average …

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