7086

• UCREFRP Catalog Number: 7086
• Author: U.S. Fish and Wildlife Service.
• Title: Indexed, Annotated Bibliography of the Endangered and Threatened Fishes of the Upper Colorado River System.
• USFW Year: 1977.
• USFW - Doc Type: Denver, Co.
• Copyright Material: YES

Alvard basin, as well as, museum specimens were
examined for taxonomic characters and their
variations. Distributions, possible influences
of the environment, taxonomic characteristics,
and variations are discussed for the cutthroat
trout.
34. Behnke, R. J. 1968. Rare and endangered TAXONOMY
species: the native trouts of western DISTRTBUTION
North America. Proceedings Western ENDANG. FISH
Association of State Game and Fish Commis- COLORADO R.
sinners 48:530-533. 5, 30
The great diversity, phenotypic plasticity, and
lack of reproductive isolation among "species"
of the native trouts in the genus Salmo of
western North America impose complex taxonomic
problems. Two relatively well defined evolution-
ary lines of trout are apparent, the rainbow
series, Salmo gairdneri, and the cutthroat
series, S. clarki. Two distinctive "trouts"
make up the cutthroat series, the coastal
cutthroats, which do not hybridize with the
rainbow, and the interior cutthroats. The
interior cutthroats consist of several subgroups
found in the upper Columbia and Missouri Rivers,
the south Saskatchewan, Colorado, Rio Grande,
South Platte, Arkansas, and drainages of the
Great Basin. The Cutthroat trout most widely
distributed in western states, originated from.
Yellowstone Lake, Wyoming. Pure populations in
the Bonneville basin, the Colorado, Rio Grande,
South Platte, and Arkansas River systems are
rare. A brief discussion of the endangered
interior cutthroat, Salmo clarki henshawi and
the golden trout complex is included.
35. Behnke, R. J. 1970. Rare and endangered DATA
species report: the native cutthroat ENDANG. FISH
trout of the Colorado-Green River basin, POPULATIONS
Salmo clarki pleuriticus. Colorado GENETICS
Cooperative Fishery Unit. 7 pp. (mimeo) 5
The native cutthroat trout (S. c. pleuriticus)
of the upper Green River drainage was studied
because that is the type locality for specimen
on which the name pleuriticus is based. The
plan of the study consisted of examining and
recording data from samples of possible pure
24