期刊
SPATIAL AND SPATIO-TEMPORAL EPIDEMIOLOGY
卷 26, 期 -, 页码 1-13出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.sste.2018.04.004
关键词
Caligus; Pyrethroids; Multivariable analysis; Spatio-temporal analysis
资金
- Atlantic Veterinary College of University of Prince Edward Island (UPEI)
- Canada Excellence Research Chairs Program
- Instituto Tecnologico del Salmon (Intesal) from SalmonChile
Synthetic pyrethroids have been widely used in Chile to control the sea lice Caligus rogercresseyi, a major ectoparasite of farmed salmon. Although resistance of C. rogercresseyi to pyrethroids has been reported in Chile, there is no information regarding the geographic extent of this problem. In this study we explored the spatial and temporal variation of C. rogercresseyi's response to pyrethroids in Chile from 2012 to 2013. We modeled lice abundance one week after treatment with a linear mixed-effects regression, and then we performed spatial and spatio-temporal cluster analyses on farm-level effects and on treatment-level residuals, respectively. Results indicate there were two areas where the post-treatment lice counts were significantly higher than in the rest of the study area. These spatial clusters remained even once we adjusted for environmental and management predictors, suggesting unmeasured factors (e.g. resistance) were causing the clustering. Further investigation should be carried out to confirm this hypothesis. (c) 2018 Elsevier Ltd. All rights reserved.
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