8166

• UCREFRP Catalog Number: 8166
• Author: McAda, C. W. and L. R. Kaeding.
• Title: Relations Between the Habitat Use of Age-0 Colorado Squawfish and Those of Other Sympatric Fishes in the Upper Colorado River Basin.
• USFW Year: 1989.
• USFW - Doc Type: Grand Junction, Colorado.
• Copyright Material: NO

i
t
1
1
i~
t

1
i~
t
1
1
1
1
1
1
1
between 0.36 and 0.82 (Tables 3 and 4). They were significantly correlated
only in one instance in backwaters in the Colorado River. The C/E of red
shiners was significantly correlated with that of Colorado squawfish in all
habitats combined and in backwaters in three of the four cases examined in the
Colorado River (r = 0.4-0.7). However, they were significantly correlated
only in one instance in the Green River. The C/E of sand shiners was
significantly correlated with Colorado squawfish in riverwide samples in
backwaters and in all habitats combined in the Colorado River, but in only one
instance in the Green River. This may reflect the greater abundance of sand
shiners in the Colorado River than in the Green River. The C/E of the other
species examined was infrequently correlated with that of Colorado squawfish
(Tables 3 and 4).
Discussion
Based on our analyses, only limited habitat partitioning was evident
between Colorado squawfish and the six sympatric species examined. Age-0
Colorado squawfish showed no habitat separation with three introduced fishes--
red shiner, sand shiner and fathead minnow (Tables 1 and 2). The C/E of
Colorado squawfish and each of these three species was weakly correlated in
many instances in the Colorado and Green rivers (Tables 3 and 4). The weak
correlations may result, in part, from the great abundance of red shiner and
fathead minnow when compared to the rare Colorado squawfish. In contrast, the
habitat overlap of Colorado squawfish with the two native species examined--
Gila spp. and speckled dace--was only moderately high and less than that of
Colorado squawfish with any of the introduced species. McAda and Tyus (1980)
13
1