Androgens are intricately involved in reproductive and aggressive behaviors, but the role of the androgen receptor in mediating these behaviors is less defined. Further, activity of the hypothalamic-pituitary-gonadal axis and hypothalamic-pituitary-adrenal axis can influence each other at the level of the androgen receptor. Knowledge of the mechanisms for androgens' effects on behaviors through...

Lygus hesperus Knight (Hemiptera: Miridae) is a key pest of cotton (Gossypium spp.) in the western United States that injures ßoral buds (squares) and developing fruit (bolls). Levels of Lygus-induced damage to cotton can vary by Lygus ages or gender, and these variations complicate interpretation of studies designed to elucidate Lygus and cotton interactions. Variations in observed injury may ...

This review focuses on research into the hormonal control of behaviors in amphibians that was conducted prior to the 21st century. Most advances in this field come from studies of a limited number of species and investigations into the hormonal mechanisms that regulate reproductive behaviors in male frogs and salamanders. From this earlier research, we highlight five main generalizations or con...

This chapter reviews research on amphibians, focusing on questions about the hormonal mechanisms that regulate reproductive behaviors. In the roughskin newt (Taricha granulosa) and other amphibians, reproductive behaviors are activated and maintained by the usual set of sex steroid hormones—testosterone, 5αdihydrotestosterone, and 17β-estradiol. Sex steroids appear to act on the brain and activ...

In mammals, innate reproductive and defensive behaviors are mediated by anatomically segregated connections between the amygdala and hypothalamus. This anatomic segregation poses the problem of how the brain integrates activity in these circuits when faced with conflicting stimuli eliciting such mutually exclusive behaviors. Using genetically encoded and conventional axonal tracers, we have fou...

BACKGROUND The global number of youths has risen with a majority living in Southeast Asia. In Cambodia, rural youths often face difficult barriers to health, which include lack of sexual and reproductive health knowledge, information, and services. Risky behaviors are a threat to the health of many young people in Cambodia. METHODS We studied a sample of 300 youths to describe sexual and repr...

During evolution, the ability to overeat and store the extra energy as glycogen and lipids in specialized tissues must have conferred a reproductive advantage by releasing animals from the need to eat constantly, enabling them to engage in behaviors that improved reproductive success. Mechanisms that inhibited ingestive behavior might have been most adaptive when they caused individuals to stop...