This edited series has three principal goals. The first is to
provide information in a relatively concise way for researchers
needing an over view of specific disciplines. The second is to
provide an update on specific schools of thought, bringing together
ideas from colleagues whose works often appear in a variety of
journals. And the third is to stimulate and suggest directions for
new research. Volume 6 continues the tradition established by the
previous editor and editorial board in providing new information,
updating our understanding of specific dis ciplines, and
stimulating new research. In the first chapter, Randall Breitwisch
examines mortality patterns and sex ratios in monogamous birds. He
argues that there are many more components to measuring parental
investment than are often re alized; our knowledge is weak in
several areas. Understanding the evo lution of mating systems
depends on better distinguishing the different intensities of
natural selection that operate on males and females. Greg ory
Butcher and Sievert Rohwer develop a framework for assessing the
role of colorfulness in birds. They propose several hypotheses to
test and advocate evaluating more than one hypothesis at a time.
Future work on the evolution of distinctive coloration and of
sexual and age dimorphism must take these ideas into account."
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