High incidence of a male-specific genetic marker in phenotypic female chinook salmon from the Columbia River

J J Nagler; J Bouma; G H Thorgaard; D D Dauble

doi:10.2307/3434923

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High incidence of a male-specific genetic marker in phenotypic female chinook salmon from the Columbia River

Journal article

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Peer reviewed

High incidence of a male-specific genetic marker in phenotypic female chinook salmon from the Columbia River

J J Nagler, J Bouma, G H Thorgaard and D D Dauble

Environmental health perspectives, Vol.109(1), pp.67-69

01/2001

DOI: https://doi.org/10.2307/3434923

Handle:

https://hdl.handle.net/2376/111665

PMCID: PMC1242053

PMID: 11171527

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Abstract

Water Pollutants, Chemical - adverse effects

Phenotype

Animals

DNA - analysis

Polymerase Chain Reaction

Female

Male

Environmental Exposure

Genetic Markers

Disorders of Sex Development

Oncorhynchus - genetics

Y Chromosome - genetics

Numerous populations of anadromous salmonids in the northwestern United States have been declining for many years, resulting in Endangered Species Act listings and in some cases extinction. The degradation of river ecosystems has been proposed as one of the major reasons for the inability of salmon to maintain their populations. However, the specific factors interfering with the reproduction and survival of salmon during the freshwater phase of their life cycle have not been fully described. This study was initiated to determine the incidence of phenotypic sex reversal in wild, fall chinook salmon (Oncorhynchus tshawytcha) that returned to spawn in the Columbia River. Fish were sampled at different locations within this watershed to determine whether they were faithfully expressing their genotype. We report a high incidence (84%) of a genetic marker for the Y chromosome in phenotypic females sampled from the wild, which was not observed in female fish raised in hatcheries. It appears likely that female salmon with a male genotype have been sex reversed, creating the potential for an abnormal YY genotype in the wild that would produce all-male offspring and alter sex ratios significantly.

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Title: High incidence of a male-specific genetic marker in phenotypic female chinook salmon from the Columbia River
Creators: J J Nagler - Department of Biological Sciences and Center for Reproductive Biology, University of Idaho, Moscow, Idaho 83844-3051, USA. jamesn@uidaho.edu
J Bouma
G H Thorgaard
D D Dauble
Publication Details: Environmental health perspectives, Vol.109(1), pp.67-69
Academic Unit: Biological Sciences, School of
Publisher: United States
Identifiers: 99900547340201842
Language: English
Resource Type: Journal article