Sperm are produced in astronomical numbers compared with eggs, and there is good
evidence that sperm competition is the force behind the evolution of many tiny sperm …

Why are females so choosy when it comes to mating? This question has puzzled and
marveled evolutionary and behavioral ecologists for decades. In mating systems in which …

This book presents the first unified conceptual and statistical framework for understanding
the evolution of reproductive strategies. Using the concept of the opportunity for sexual …

Reproductive Biology of Teleost Fishes is the first integrated review of the reproductive
biology of the bony fishes, which are the most species-rich and diversified group of …

Among vertebrates, fish show by far the greatest variability of alternative reproductive tactics
(ARTs). Usually, males attempting to monopolize access to females or fertilizations are …

Publisher Summary This chapter reviews the current knowledge of variation in sperm
morphology over several levels of biological organization: variation within males (both within …

Publisher Summary Sperm competition is the competition between the ejaculates of different
males for the fertilization of a given set of ova. Charles Darwin (1871) proposed sexual …

The approaches of the social and the biological sciences to the study of behavior have been
seen as almost mutually exclusive. The nature versus nurture debate has been almost …

Under sperm competition, a male's fertilization success depends largely on the ejaculate
characteristics of competing males. Theoretical models predict that, in external fertilizers …

Evolutionary ecologists are attempting to explain how parents make behavioural decisions
about how much care to provide to their young,,,. Theory predicts that when genetic …