Effects of diquat dibromide herbicide exposure on biomarkers of stress and chemical exposure in two non-target fish species
Date
2018-12-20
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Abstract
Flowering rush is an invasive plant that creates dense blooms, blocking waterways and reducing available fish habitat. Diquat dibromide was applied to eradicate flowering rush in a small water body near Innisfail, Alberta. An observational study was undertaken to assess the effects of diquat on non-target fish species under field conditions. Brook stickleback and fathead minnows were collected from the exposed water body and a reference site before and after two applications of diquat. Mass, length, condition factor, and hepatosomatic index were significantly different between the two sites, but the differences were not correlated with diquat exposure. Secondary stress (HSP70, HSC70) and chemical exposure (CYP1A) biomarkers also did not change in association with diquat exposure. The cortisol response was normal following diquat exposure. No evidence was obtained to suggest that diquat was causing sub-lethal toxic effects in these fish species following use of diquat to eradicate invasive flowering rush.
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Keywords
invasive plant management, diquat dibromide, stress response, ecotoxicology
Citation
Cribb, E. (2018). “Effects of diquat dibromide herbicide exposure on biomarkers of stress and chemical exposure in two non-target fish species” (Master's thesis, University of Calgary, Calgary, Canada). Retrieved from https://prism.ucalgary.ca.