9430

• UCREFRP Catalog Number: 9430
• Author: Meffe, G. K. and R. C. Vrijenhoek
• Title: Conservation Genetics in the Management of Desert Fishes
• USFW Year: 1988
• USFW - Doc Type: Conservation Biology
• Copyright Material: NO

McBe and Vrijenhoek
Conservation Genetics of Desert Fishes 163
GROUPS
0.16
0.15
0.13
F-
p 0.1 1
O
~ 0.10
O
~ 0.08
w
U
z
Q
0
0.07
0.05
0.03
0.02
0.0
......
.......
......
.......
.......
.. .... ....
....
....
....
...
.... ....
...
....
...
....
.... ...
....
...
....
....
...
- .........
...... _
.........
........
........
.........
6 :::_
D < :>

;::
;.
';: .::
F I

.......
......
.......
.... _
.... .
...... ...
....
...
....
...
.... ....
....
....
....
....
.... ...
..
...
..
...
.. .... ..
.......
.......
.......
.... ..
.......
.~~~N.~~~~~.~~~~~~~..~~~~~~
......~p ~ .................
..........................
,........., p .......~.~..
.~E. . R , .....~~...~..
............. ........
~Q ~~~
Figure 4. Genetic relationships among Poeciliopsis occidentalis populations The dendogram produced three
clusters that correspond with geographical distributions on the map. Apparent nonlinearity of the dendogram
scale is due to rounding. (Reprinted with permission from Vrijenhoel~ Douglas; F> Meffe 1985.)
3 ). A rapid decline ensued over the last four decades to
the point that the fish was included on the Federal En-
dangered Species List in 1973.
Decline of the topminnow is attributed to widespread
habitat destruction and replacement by the introduced
mosquitofish (Gambusia affinis) (Meffe et al. 1983;
Meffe 1985). In 1983 the topminnow occurred in 15
natural habitats in the United States. Presently, the fish
occurs in 12 natural localities in Arizona (Fig. 3), all of
which are isolated headwater springs or streams, but it
Conservation Biobgy
Volume 2, No. 2, June 1988