Impact of Environmental Stressors on the Dynamics of Disease Transmission

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• 作者：Frank J. Loge ; Mary R. Arkoosh ; Timothy R. Ginn ; Lyndal L. Johnson ; and Tracy K. Collier
• 刊名：Environmental Science & Technology
• 出版年：2005
• 出版时间：September 15, 2005
• 年：2005
• 卷：39
• 期：18
• 页码：7329 - 7336
• 全文大小：359K
• 年卷期：v.39,no.18(September 15, 2005)
• ISSN：1520-5851

文摘

Infectious disease within outmigrant juvenile salmon inthe Columbia River Basin is modulated, in part, by abioticstressors that influence host-susceptibility. Through theapplication of a dose-structured population dynamic model,we show that chemical (both in the river and in theestuary) and in-river (e.g., dams and/or predation) stressorsinfluence host-susceptibility, increasing the mean forceof infection (defined as the per capita acquisition rate ofinfection) by a factor of 2.2 and 1.6, respectively. UsingListonella anguillarum as a model pathogen, nonchemical in-river and chemical stressors contribute equally to acumulative incidence of delayed disease-induced mortalitiesin Chinook salmon that range from 3% to 18% for estuaryresidence times of 30-120 days, respectively. Mitigationof environmental stressors that increase host-susceptibilitycould represent a significant component in futuremanagement strategies to recover listed stocks.