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�…

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�…

Abstract Theory suggests that parental relatedness is a continuous variable with a fitness
optimum that we heretoforth will refer to as 'optimal outbreeding'. In the present paper, we�…

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�…

Rana esculenta Linnaeus is a hybrid between R. ridibunda Pallas and R. lessonae
Camerano. Diploid individuals usually occur in populations with R. lessonae (LE system)�…

Very few studies have investigated the occurrence of multiple paternity and sperm
competition in amphibians. We studied genetic relatedness within kin groups of tadpoles of�…

Publisher Summary This chapter illustrates the development of genetic differences that lead
to hybrid inviability. It is pointed out that the species level of divergence can be reached with�…

Sympatric congeneric anurans exist together under systems of adjustment to coexistence of
their populations, systems that reflect a past history of the populations under allopatry and�…

Sex chromosomes are expected to evolve suppressed recombination, which leads to
degeneration of the Y and heteromorphism between the X and Y. Some sex chromosomes�…

Frogs were once thought to have relatively uninteresting social behavior, but recent studies
on tropical and temperate zone species have revealed a surprising diversity of social�…