Estimates of individual life-history traits
Based on the pedigree, we used the number of recruits produced by each
individual in each year to calculate all the elements of individual
projection matrices and derive some key life-history traits, such as
individual expected growth rate and generation time (McGraw & Caswell
1996). To calculate an individual’s generation time, it must have
produced a recruit. Thus, only individuals that produced at least one
recruit during their lifetime were considered in these analyses of
individual life-histories, resulting in a total of 1052 individuals (552
females and 500 males, see Table S1 for more details). From the
individual projection matrix, we estimated individual generation time,
measured as the weighted mean age at reproduction. As well as the
expected individual growth rate, estimated as the dominant eigen value
of the individual projection matrix (see Appendix for formulas). We also
estimated the first age when an individual produced a recruit (first
age), its lifespan, the average number of recruits per year
(reproductive rate) and the total number of recruits produced during its
life (lifetime reproductive success).