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Impact of crude oil and the dispersant Corexit™ EC9500A on capelin (Mallotus villosus) embryo development.

Beirão, José; Baillon, Lucie; Litt, Margaret A.; Langlois, Valérie S.; Purchase, Craig F. (2019). Impact of crude oil and the dispersant Corexit™ EC9500A on capelin (Mallotus villosus) embryo development. Marine Environmental Research , vol. 147 . p. 90-100. DOI: 10.1016/j.marenvres.2019.04.004.

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Résumé

Marine food webs are particularly vulnerable to oil spills if keystone species are impacted. To quantify lethal and sublethal toxicity in a key Holarctic forage fish, capelin embryos were exposed to Hibernia crude oil water accommodated fraction (WAF) produced at an oil-to-water ratio of 1:9 (v:v) and chemically-enhanced WAF (CEWAF) produced with the dispersant Corexit™ EC9500A at a dispersant-to-oil ratio of 1:10 (CEWAF H) or 1:50 (CEWAF L). Corexit alone yielded similar embryotoxicity to CEWAF. 10% CEWAF H, with total polycyclic aromatic hydrocarbons of 99.2 μg/L, decreased embryo survival following 10 h of exposure, while continual exposed to 1% CEWAF L decreased hatching and heart rates. Concentrations down to 0.1% CEWAF L increased in a dose-dependent manner the transcript level of cytochrome P4501a1 (cyp1a1) in hatched larvae. These data indicate that embryo-larval survival of capelin is likely at risk if an oil spill coincides in space and time with spawning.

Type de document: Article
Mots-clés libres: ecotoxicology; petroleum hydrocarbons; polycyclic aromatic hydrocarbons; oil spill
Centre: Centre Eau Terre Environnement
Date de dépôt: 04 déc. 2019 15:14
Dernière modification: 04 déc. 2019 15:14
URI: http://espace.inrs.ca/id/eprint/9626

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