7842

• UCREFRP Catalog Number: 7842
• Author: Knopf, F. L.
• Title: Biological Diversity in Wildlife Management.
• USFW Year: 1992.
• USFW - Doc Type: 1992.
• Copyright Material: NO

CALIFORNIA CONDORS
200
W
N_
En 150
Z
0
F-
100
CL
0
a
w
50
F-
d
e
U
0
....................................................
FROM THE WILD:
REINTRODUCED:
10
8 it
6 W M
4
2 Z
0
1980 1982 1984 1988 1988 1990 1992
YEAR
Figure 2D. continued
be a compromise between the number of animals required according to genetic and
demographic considerations and the limited resources available (Ballou and Foose
in press).
The target population size determines the number of breeding animals in the captive
population and, thus, the potential number of offspring available for reintroduction
each year. Thus, it could conceivably be desirable to specify a target size above the
number of individuals required for genetic reasons if very large numbers of young
were wanted for reintroduction.
Acquiring the remaining founders. Once the taxon is breeding well in captivity,
it is desirable to capture the required number of founders as soon as possible. The
speed with which this can be accomplished depends upon many variables, such as
the available captive facilities and the impact of removing individuals from the wild
population. The founders for the ferret, rail and condor populations were obtained
within a three to five year period (Figure 2, B-D). The original founder animals (or
272 ? Trans. 57`h N. A. Wildl. & Nat. Res. Conf. (1992)