Record Details

A genetic study of the red-band trout (Salmo sp.)

ScholarsArchive at Oregon State University

Field Value
Title A genetic study of the red-band trout (Salmo sp.)
Names Wilmot, Richard L. (creator)
Simon, Raymond C. (advisor)
Date Issued 1973-07-16 (iso8601)
Note Graduation date: 1974
Abstract A group of trout that reside in streams of the desiccating lake
basins of southeastern Oregon differ markedly from other known
Salmo. Known commonly as the red-band trout, this fish was subjected
to chromosome analysis for comparison with other species of
western North American Salmo. The karyotype of the red-banded
trout is 2n = 58 composed of 44 metacentrics, 2 metacentrics with
satallites, 2 sub-metacentrics and 10 acrocentrics to give 104 chromosome
arms. This karyotype is identical to that of the California
golden trout, S. a.guabonita. A similar karyotype has been found,
for trout from the Deschutes River and summer-run steelhead from
the Siletz and Clearwater rivers. The chromosomal and distributional
data is believed to indicate a widespread golden trout complex
composed of the red-band trout, the California golden trout, and the
Kern River trout inhabiting the Pacific Coast drainage from British Columbia to southern California. In the course of this study, a new
karyotype was discovered for the Alvord cutthroat trout of 2n = 64
with 40 metacentrics and 24 acrocentrics to give 104 chromosome
arms.
Nineteen enzyme systems were analysed by starch-gel electrophoresis
in two populations of the red-band trout. The Bridge Creek
population displayed very low variability for only malate dehydroge,
nase (MDH) and phosphoglucomutase (PGM). No variability was
found in the Three-Mile Creek population. A new allele, not previously
reported was found for MDH in the Bridge Creek population.
The high degree of genetic similarity among and between these
populations is thought to be the result of selection pressure rather
than stochastic processes.
The isolated populations of the red-banded trout appear to be
well adapted to their present environment, but without the genetic
variability to meet future environmental changes, they may face
extinction. Their most immediate threat is man' s use of the environment.
Genre Thesis/Dissertation
Topic Trout
Identifier http://hdl.handle.net/1957/44344

© Western Waters Digital Library - GWLA member projects - Designed by the J. Willard Marriott Library - Hosted by Oregon State University Libraries and Press