Steroid hormone levels in calling males and males practicing alternative non-calling mating tactics in the green treefrog, Hyla cinerea

Abstract Circulating glucocorticoids and androgens often figure prominently in mating tactic expression in vertebrates. In anuran amphibians (frogs and toads), for example, recent models predict that the depletion of energy reserves during vocalization will result in increased glucocorticoid levels; high glucocorticoids are expected to negatively affect androgen level to mediate transitions from calling to non-calling […]

The effect of social environment on alternative mating tactics in male Endler’s guppy, Poecilia wingei

Variation in sexual behaviour has both genetic (no experience or social contact needed) and environmental (based on individual experience) components. Within species, males can maximize their fitness during inter- and intrasexual selection in a variety of ways. This may lead to evolution of alternative male mating behaviours resulting in a dichotomy between courting/guarding and sneaking […]