Published online by Cambridge University Press: 21 January 2010
INTRODUCTION AND OBJECTIVES
A distinguished student of human sexuality, John Money (1991), has commented that ‘Reproduction is more respectable than sex. Reproductive biologists and sexologists seldom attend the same meetings or publish together in the same journals.’ To some extent this bias against studies of behaviour, and especially studies of sexual behaviour, has also affected research on animal reproduction. However, the tide has begun to turn over the past two decades, and there are several reasons for this. Gamete biologists have begun to collaborate with behavioural scientists in order to explore the role played by ‘sperm competition’ and ‘cryptic female choice’ in the evolution of sexual behaviour and mating systems (Eberhard, 1985, 1996; Birkhead & Møller, 1992, 1998; Dixson, 1998). Stronger links have also been forged between behavioural biology and endocrinology; the emerging field of socioendocrinology seeks to understand relationships ‘between social environment, hormones and behaviour, because they modulate the reproductive success of individuals’ (Bercovitch & Ziegler, 1990). Finally, behavioural ecologists have taken a renewed interest in exploring the mating systems and mating tactics of a wide range of animals, especially because modern genetic techniques have made it possible to determine paternity and to measure the reproductive success of individuals in free-ranging populations (Davies, 1991; Martin et al., 1992; Birkhead & Møller, 1992).
Multiple relationships between behaviour and reproduction are illustrated in a schematic fashion in Figure 2.1.
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