Assertion: cormorant's number | /r/HasProperty | cthe use of mortality rates
Facets:
Source sentences:
text: An estimate of the total population is thus typically made on the basis of (a) the number of breeding pairs, (b) estimates of the average number of fledged young that each pair produces, (c) the use of mortality rates for different age classes of birds, and (d) assumptions about the proportion of birds breeding of the different age-classes.