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Updated: Aug 15, 2026

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Published on: December 2, 2015
Impact of environmental stressors on the dynamics of disease transmission
Frank J Loge1, Mary R Arkoosh, Timothy R Ginn
1Department of Civil and Environmental Engineering, University of California at Davis, 1 Shields Avenue, Davis, California 95616, USA. fjloge@ucdavis.edu
Abstract:
Infectious disease within outmigrant juvenile salmon in the Columbia River Basin is modulated, in part, by abiotic stressors that influence host-susceptibility. Through the application of a dose-structured population dynamic model, we show that chemical (both in the river and in the estuary) and in-river (e.g., dams and/or predation) stressors influence host-susceptibility, increasing the mean force of infection (defined as the per capita acquisition rate of infection) by a factor of 2.2 and 1.6, respectively. Using Listonella anguillarum as a model pathogen, nonchemical in-river and chemical stressors contribute equally to a cumulative incidence of delayed disease-induced mortalities in Chinook salmon that range from 3% to 18% for estuary residence times of 30-120 days, respectively. Mitigation of environmental stressors that increase host-susceptibility could represent a significant component in future management strategies to recover listed stocks.
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