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Effects of thiamethoxam and neonicotinoid mixtures on early life stages of wild sockeye salmon (Oncorhynchus nerka)

Resource type
Thesis type
(Thesis) M.Sc.
Date created
2022-04-28
Authors/Contributors
Abstract
This is the first study to report the acute and chronic effects of environmentally relevant concentrations of thiamethoxam, ranging from 0.15-150 μg/L and a mixture of clothianidin, imidacloprid, and thiamethoxam neonicotinoid pesticides, ranging from 0.045-450 μg/L, on one wild stock of British Columbia sockeye salmon. No effects were observed on growth, development, and a targeted suite of ten genes involved with reproduction, growth, stress response, and nervous and immune function after chronic thiamethoxam or neonicotinoid mixture exposures. However, acute thiamethoxam exposure during fertilization showed reproductive toxicity via a 25% reduction in fertilization success, and subsequent teratogenic effects with abnormal length, weight, and condition factor in swim-up fry in all thiamethoxam and some of neonicotinoid mixture concentrations tested. These findings could have potential implications for wild salmon populations as pulse exposures are environmentally relevant, especially given the amount agriculture and rainfall in the lower Fraser River watershed in British Columbia, Canada.
Document
Extent
121 pages.
Identifier
etd21943
Copyright statement
Copyright is held by the author(s).
Permissions
This thesis may be printed or downloaded for non-commercial research and scholarly purposes.
Supervisor or Senior Supervisor
Thesis advisor: Marlatt, Vicki
Language
English
Member of collection
Download file Size
etd21943.pdf 2.31 MB

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