Embryotoxicity of maternally transferred methylmercury to fathead minnows (Pimephales promelas)
| Autor: | Brianne K. Soulen, Aaron P. Roberts, Paul E. Drevnick, Carmen L. Overturf, Kristin N. Bridges |
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| Rok vydání: | 2015 |
| Předmět: |
0106 biological sciences
Embryo Nonmammalian Health Toxicology and Mutagenesis Cyprinidae Embryonic Development 010501 environmental sciences 01 natural sciences chemistry.chemical_compound Animal science biology.animal Environmental Chemistry Animals Methylmercury 0105 earth and related environmental sciences biology Dose-Response Relationship Drug Hatching 010604 marine biology & hydrobiology Embryogenesis Embryo Mercury Minnow Methylmercury Compounds biology.organism_classification chemistry Environmental chemistry Larva embryonic structures Female Pimephales promelas Reproductive toxicity Water Pollutants Chemical |
| Zdroj: | Environmental toxicology and chemistry. 35(6) |
| ISSN: | 1552-8618 |
| Popis: | Mercury (Hg) is a ubiquitous environmental contaminant and potent neurotoxin. In aquatic environments, Hg can be transformed into methylmercury (MeHg), which bioaccumulates in aquatic food webs, including fish. Methylmercury has been shown to transfer from female fish to developing eggs; however, relatively little is known regarding the effects of maternally transferred MeHg on fish embryos. The present study evaluated the effects of maternally transferred MeHg on fathead minnow (Pimephales promelas) embryos. Embryos were collected from adult fatheads exposed for 30 d to 1 of 3 diets spiked with MeHg: a control diet (0.02 ppm Hg dry wt), a low diet (0.87 ppm Hg dry wt), or a high diet (5.5 ppm Hg dry wt). No effects on spawning frequency, clutch size, or total egg output were observed. In embryos, Hg concentration was a function of female diet and the duration (number of days) of female exposure. Compared with controls, embryos from the low-diet treatment displayed altered embryonic movement patterns (hyperactivity) and decreased time to hatch. Embryos from the high-diet treatment had delayed hatching and increased mortality compared with the other treatments. Collectively, these results suggest that maternally transferred Hg may impact survival, behavior, and developmental milestones of the embryo-larval stages of fish. Environ Toxicol Chem 2016;35:1436-1441. © 2015 SETAC. |
| Databáze: | OpenAIRE |
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