7017

• UCREFRP Catalog Number: 7017
• Author: Starnes, W. C.
• Title: Colorado River Basin
• USFW Year: 1989.
• Copyright Material: NO

chromosomal analysis, but there is no mention of robusta
material from the area of the Moretti et al. study
(Desolation Canyon) being analyzed in the electrophoretic
study. A possible hybrid origin involving eleuans and
robusta is postulated for seminuda, a view previously
expressed by Smith et al., 1979. It is admitted that the
results of the study may have shortcomings due to small
sample sizes, lack of certain tissues from some populations,
and other factors. The study contributes to the foundation
of understanding allozyme variation in Gila spp.
1989. Tyus, H.M., and C.A. Karp. Habitat use and streamflow
needs of rare and endangered fishes, Yampa River, Colorado.
U.S. Fish & Wildlf. Serv. Biol. Rpt. 89(14). 27 p.
States that chub specimens encountered in Yampa River
studies are clearly assignable to G. cytpha or G. robusta
(see Douglas et al., above). Based on this situation in the
relatively unaltered Yampa, it is suggested that
intermediates in other canyon areas of the upper Colorado
basin may be induced by habitat changes (hybridization is
not specifically implied). of interest to impending
taxonomic studies, will be a morphological, biochemical, and
molecular comparison of this population seemingly
maintaining integrity with those in more disturbed habitats.
Unpublished Manuscripts Examined
Kaeding, L.R., B.D. Burdick, P.A. Schrader, and C.W. McAda.
Temporal and spatial relations between the spawning of
humpback and roundtail chub in the upper Colorado River.
Unpub. ms. 19 p.
This study, aimed primarily at investigations of habitat and
fish movements, also included a principal components
analysis of data taken from a large sample of live chubs
from the Black Rocks area of Colorado River. The great
majority of individuals were classifiable as G. cypha or
robusta but it was speculated that the remaining unclassifed
group might contain hybrids and backcrosses.
Karp, C.A., and H.M. Tyus. Distribution, spawning, and
morphology of humpback chub, Gila cypha, in the Yampa and
Green rivers, Dinosaur National Monument, Colorado and Utah.
34 p.
In concert with studies of reproductive biology, these
authors conducted comparative morphological studies on live
Yampa and adjacent Green River chubs a priorily identified
as either roundtails, humpbacks, or intermediates, using ten
easily assessed attributes (measurements, counts, weight).
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