The scope of environmental impact on reproduction is very large. It aims
at covering all aspects of reproductive problems and their links to the
environment. Therefore, it deals with female and male reproductive
impairments, whatever their severity and their sites, gonad or
extra-gonad. For women, effects include direct lesions of the oocyte,
with possibilities of chromosomal abnormalities but also malformations
of the reproductive tract. Reduced fertility and in some cases total
infertility may also result from menstrual irregularities, which can at
times include anovulatory cycles. Hormonal changes, even in the absence
of menstrual irregularities may also lead to decreased fertility. In
addition to congenital malformations, other impairments of the
reproductive apparatus may occur, as in the polycystic ovarian syndrome
or in endometriosis. Finally one can also include effects during
pregnancy leading to spontaneous abortion, preterm delivery still birth
or altered sex ratio. Impacts on age at menarche and age at menopause
lead to a change in the duration of reproductive life.