We have analyzed the sterility associated with introgressions of the distal one-fourth of the X
chromosome from either Drosophila mauritiana or Drosophila sechellia into the genome of�…

Drosophila simulans and Drosophila mauritiana are closely related sibling species, the
former cosmopolitan and the latter restricted to the small oceanic island of Mauritius. Genetic�…

Analysis of the mating call is useful for the study of evolutionary problems in anuran
amphibians because characteristics of the call are chiefly related to the functions of�…

Abstract The European water frog Rana esculenta (RL), a natural hybrid between R.
ridibunda (RR) and R. lessonae (LL), reproduces by hybridogenesis: haploid gametes�…

Maladaptive hybridization is hypothesized to be an important force driving the evolution of
reproductive isolation between closely related species. Because the magnitude and�…

Abstract Speciation in Chorus Frogs. I. Reproductive character displacement in the
Pseudacris nigrita complex. Syst. Zool. 24: 16–22.—Analysis of mating calls of two cognate�…

Controlled crossing experiments are an important tool in evolutionary genetics and its
interfaces with population biology, ecolog'y, and phylogenetics. This tool has been and�…

Understanding speciation depends on an accurate assessment of the reproductive barriers
separating newly diverged populations. In several taxonomic groups, prezygotic barriers�…

Understanding the general features of speciation is an important goal in evolutionary
biology, and despite significant progress, several unresolved questions remain. We�…