Coupling has emerged as a concept to describe the transition from differentiated
populations to newly evolved species through the strengthening of reproductive isolation …

▪ Abstract Many uses of gene trees implicitly assume that nominal species are monophyletic
in their alleles at the study locus. However, in well-sampled gene trees, certain alleles in one …

Species can be defined as populations that are diagnosably distinct, reproductively isolated,
cohesive, or exclusive groups of organisms. Boundaries between species in sympatry are …

The issue of species delimitation has long been confused with that of species
conceptualization, leading to a half century of controversy concerning both the definition of …

The unit of adaptation is usually thought to be a gene or set of interacting genes, rather than
the whole genome, and this may be true of species differentiation. Defining species on the …

Charles Darwin's experiences in the Galápagos Islands in 1835 helped to guide his
thoughts toward a revolutionary theory: that species were not fixed but diversified from their …

Species are the fundamental units of biology, ecology and conservation, and progress in
these fields is therefore hampered by widespread taxonomic bias and uncertainty …

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

40 Years of Evolution is a landmark study of the finches first made famous by Charles
Darwin, one that documents as never before the evolution of species through natural …

Species are defined using a variety of different operational techniques. While discussion of
the various methodologies has previously been restricted mostly to taxonomists, the …