Range shifts can rapidly create new areas of geographic overlap between formerly allopatric
taxa and evidence is accumulating that this can affect species persistence. We review the …

Adaptive radiations have long served as living libraries to study the build‐up of species
richness; however, they do not provide good models for radiations that exhibit negligible …

Introgression is an important biological process affecting at least 10% of the extant species
in the animal kingdom. Introgression significantly impacts inference of phylogenetic species …

Learning and other forms of phenotypic plasticity have been suggested to enhance
population divergence. Mate preferences can develop by learning, and species recognition …

Within odonates, male mating patterns range from active mate search to long-term territorial
defence of oviposition sites. In territorial species, males may use three mating tactics or …

The factors that determine species' range limits are of central interest to biologists. One
particularly interesting group comprises odonates (dragonflies and damselflies), which show …

Interspecific territoriality occurs when individuals of different species fight over space, and
may arise spontaneously when populations of closely related territorial species first come …

Despite persistent debate on the nature of species, the widespread adoption of Mayr's
biological species concept has led to a heavy emphasis on the importance of reproductive …

Reproductive isolation is the defining characteristic of a biological species, and a common,
but often untested prediction is a positive correlation between reproductive isolation and …

One of the longest debates in biology has been over the relative importance of different
isolating barriers in speciation. However, for most species, there are few data evaluating …