Changes in juvenile coho salmon electro-olfactogram during and after short-term exposure to current-use pesticides
Environmental Toxicology and Chemistry, ISSN: 0730-7268, Vol: 25, Issue: 10, Page: 2809-2817
2006
- 57Citations
- 50Captures
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Metrics Details
- Citations57
- Citation Indexes50
- 50
- CrossRef46
- Policy Citations7
- Policy Citation7
- Captures50
- Readers50
- 50
Article Description
For anadromous salmonids, olfaction is a critical sense, enabling return migration. In recent years, several pesticides have been identified that interfere with salmonid olfaction at concentrations in the μg/L range; thus, they may pose a risk to species longevity. In the present study, we investigated the acute effects of five agricultural pesticides on juvenile coho salmon (Oncorhynchus kisutch) olfaction using the electro-olfactogram (EOG), a measure of odorant-evoked field potentials. Electro-olfactogram responses to the odorant L-serine were measured during and following a 30-min exposure of the left olfactory rosette to chlorothalonil, endosulfan, glyphosate acid, iodocarb (IPBC), trifluralin, and 2,4-dichlorophenoxyacetic acid. With the relatively insoluble pesticides endosulfan and trifluralin, decreases in EOG amplitude were only apparent at relatively high concentrations (100 and 300 μg/L, respectively) following 20 min of exposure and were absent for chlorothalonil (1 mg/L). With the water-soluble herbicide glyphosate, significant EOG reductions occurred within 10 min of exposure to 1 mg/L and more rapidly with higher concentrations. Recovery of EOG post-glyphosate exposure was concentration-dependent, and complete recovery was not observed with some concentrations at 60 min postexposure. Dichlorophenoxyacetic acid only affected EOG at high concentration (100 mg/L), where it eliminated EOG within 2 min of exposure. With IPBC, EOG was decreased at 25 min of exposure to 1 μg/L; higher concentrations caused decreases to occur more rapidly. Excluding IPBC and glyphosate, all EOG reductions occurred at concentrations greater than the current Canadian water-quality guidelines and reported 96-h lethality values. Our results show that olfactory neurons can be impaired rapidly by some current-use pesticides, even at exposures in the low-μg/L range. © 2006 SETAC.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=33845434114&origin=inward; http://dx.doi.org/10.1897/05-629r1.1; http://www.ncbi.nlm.nih.gov/pubmed/17022425; https://academic.oup.com/etc/article/25/10/2809/7770838; http://doi.wiley.com/10.1897/05-629R1.1; https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1897%2F05-629R1.1; https://dx.doi.org/10.1897/05-629r1.1; https://setac.onlinelibrary.wiley.com/doi/abs/10.1897/05-629R1.1
Oxford University Press (OUP)
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