How much effort to expend in any one bout of reproduction is among the most important
decisions made by an individual that breeds more than once. According to life-history theory …

Abstract Contribution to Special Issue on Fast effects of steroids. Sex steroid hormones act
during early development to shape the circuitry upon which these same hormones act in …

Males in many species have complex, multicomponent sexual signals, and there may be
trade-offs between different signal components. By adjusting their signaling behaviors …

A major focus of research in behavioural ecology involves testing whether behaviour, on
average, is adaptive. Here, we note that although studies often find that individuals differ in …

More than three decades ago, models by Lande (1981) and others (Kirkpatrick, 1982,
O'Donald, 1967, Zahavi, 1975, Zahavi, 1977) inspired a resurgence of interest in sexual …

Abstract Contribution to Special Issue on Fast effects of steroids. 17β-estradiol (E 2) has
numerous rapid effects on the brain and behavior. This review focuses on the rapid effects of …

The contribution of social factors to seasonal plasticity in singing behavior and forebrain
nuclei controlling song, and their interplay with gonadal steroid hormones are still poorly …

Coordinated courtship displays are a common feature of species forming long-term pair
bonds. In lekking species, on the contrary, there are no stable pair bonds because partners …

Variation in environmental factors such as day length and social context greatly affects
reproductive behavior and the brain areas that regulate these behaviors. One such behavior …

Factors intrinsic or extrinsic to individuals, such as their quality or the quality of competition
in their social environment, can influence their communication signaling effort. We …