Much of our knowledge of the evolution of reproductive isolation comes from studies of
Drosophila. This body of work has revealed the following patterns:(1) reproductive isolation�…

From literature data on 116 taxa crosses involving 46 species of frogs, we found a positive
correlation between degree of divergence (measured as Nei's genetic distance, D) and�…

The study of the patterns of reproductive isolation in relation to species divergence is critical
for the understanding of the process of speciation. Comparative analyses of this kind were�…

The settling of breeding habitat by migratory waterfowl is a topic of both theoretical and
practical interest. We use the results of surveys conducted annually during 1955-81 in major�…

Changes in general fall and winter distributions of Mallards and Black Ducks over the past
century have resulted in markedly increased sympatric contact during pair formation�…

The first review of the phenomenon of interspecific hybridization in animals appears to be
that of Haldane (1922), who catalogued all cases known to that time in which crosses�…

The chromosomal determination of interspecific differences in mating behavior was studied
in the interfertile pair, Drosophila arizonensis and Drosophila mojavensis, by means of�…

MATERIALS AND METHODS The reader should consult our previous paper (Coyne and Orr
1989a) for a detailed description of our criteria for including species, determining whether�…

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

Drosophila yakuba is widespread in Africa, whereas D. santomea, its newly discovered
sister species, is endemic to the volcanic island of S�o Tom� in the Gulf of Guinea�…