Control of Reproduction

Abstract

The first chapters of this book have shown that reproduction is an extremely complex phenomenon which includes maturation of the gonads, development of primary and secondary sex characteristics, gamete production, preparation of the reproductive ducts, and reproductive behaviour. The previous chapter described the various reproductive cycles in different climatic zones and habitats and demonstrated that, for most if not all chelonians, reproduction is a seasonal and cyclic event. The focus of this chapter is on the “proximate causes” of breeding seasons sensu Baker (1938), on the factors that initiate the sexual cycles at the appropriate time of the year and on the mechanisms through which these factors regulate the processes of reproduction.