s type. For
populations that reproduce in a pulse once per year. The demographic
census may be carried out before or after the reproduction event. There
are thus two types of census: Pre- and post-reproductive census. This
distinction has potentially important implications for demographic
measures because of its effects on measured population structure. For
example, the fraction of individuals in the first age class will tend to
be larger larger in a post-reproductive census than a pre-reproductive
census. 