Salmo trutta
Oreochromis niloticus
Micropterus salmoides
N
High : 0.79
Low : 0.00
High : 0.92
Low : 0.00
Low : 0.03
High : 0.85
N
0
250
500
Kilometers
N
Fig. 6.7 Results of niche
models fitted to the
distributions of Brown Trout
Salmo trutta which require
cold (<9
C) winter
temperatures for spawning
and do not establish in rivers
where temperatures exceed
22
C for more than a few
days, Nile Tilapia
Oreochromis niloticus
which is a warm-water
species that is intolerant of
temperatures cooler than
14
C, and Largemouth Bass
Micropterus salmoides
which have a wide
temperature tolerance
ranging from just above
freezing to 34
C
176
O. L. F. Weyl et al.