International International studbook for Grevy's zebra ... - Marwell Zoo

Demographic Demographic Graphs
Graphs
Grevy’s Grevy’s zebra zebra studbook
studbook
Global Global population
population
population
All graphs have been smoothed 1x in PM2000
Mx – age specific fecundity.
Average number of same sex offspring
produced by a parent of age class x.
(e.g.: the average number of daughters
born to mothers
Qx – age specific mortality
The average proportion of animals that
are expected to die within a given age
class. The lower the value, the greater
the average survival through an age
class x
Vx – Reproductive Value
Expected future lifetime reproduction by
an animal of age x
Lx – Age specific survivorship.
Probability of a newborn surviving the
the value, the greater average survival
from birth to age class x