For sexual selection to act on a given sex, there must exist variation in the reproductive
success of that sex as a result of differential access to mates or fertilisations. The …

The past half century has seen the development of the field of post-ejaculatory sexual
selection, the sequel to sexual selection for mate-acquisition (pre-ejaculatory) described by …

The role of non-gametic components of the ejaculate (seminal fluid) in fertility and sperm
competitiveness is now well established. Surprisingly, however, we know far less about …

Fertilization is the fundamental process that initiates the development of a new individual in
all sexually reproducing species. Despite its importance, our understanding of the molecular …

Sperm morphological variation has attracted considerable interest and generated a wealth
of predominantly descriptive studies over the past three centuries. Yet, apart from …

Mammalian sperm must spend a minimum period of time within a female reproductive tract
to achieve the capacity to fertilize oocytes. This phenomenon, termed sperm 'capacitation' …

In species with internal fertilization, females can favour certain males over others, not only
before mating but also within the female's reproductive tract after mating. Here, we ask …

In this review, we provide an overview of the current knowledge on the different sexual
systems and sex-determining mechanisms in bivalves, with a focus on the various …

Factors such as gamete quality can profoundly affect fertility, but the spawning micro-
environment that surrounds the spermatozoa and eggs during gamete contact has largely …

'Sperm competition'—where ejaculates from two or more males compete for fertilization—
and 'cryptic female choice'—where females bias this contest to suit their reproductive …