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Hypoxia Enhances the Toxicity of Corexit EC9500A and Chemically Dispersed Southern Louisiana Sweet Crude Oil (MC-242) to Sheepshead Minnow (Cyprinodon variegatus) Larvae.

Dasgupta S, Huang IJ, McElroy AE - PLoS ONE (2015)

Bottom Line: The goal of this study was to examine the combined effects of hypoxia and exposure to contaminants associated with oil spills.We evaluated the effects of short term (48 hr) exposures to Corexit EC9500A, water accommodated fractions (WAF), and chemically enhanced water accommodated fractions (CEWAF) prepared from Southern Louisiana Sweet Crude Oil (MC 242) on survival of sheepshead minnow (Cyprinodon variegatus) larvae held under normoxic (ambient air) or hypoxic (2 mg/L O2) conditions.In the latter case, significant interactions between the two stressors were also observed.

View Article: PubMed Central - PubMed

Affiliation: School of Marine and Atmospheric Sciences, Stony Brook University, Stony Brook, New York, United States of America.

ABSTRACT
Oil exploration and production activities are common in the northern Gulf of Mexico as well as many other coastal and near coastal areas worldwide. Seasonal hypoxia is also a common feature in the Northern Gulf, and many other coastal areas, which is likely to increase in severity and extent with continuing anthropogenic nutrient inputs. Hypoxia has well established physiological effects on many organisms, and it has been shown to enhance the toxicity of polycyclic aromatic hydrocarbons (persistent components of petroleum) in fish. The goal of this study was to examine the combined effects of hypoxia and exposure to contaminants associated with oil spills. We evaluated the effects of short term (48 hr) exposures to Corexit EC9500A, water accommodated fractions (WAF), and chemically enhanced water accommodated fractions (CEWAF) prepared from Southern Louisiana Sweet Crude Oil (MC 242) on survival of sheepshead minnow (Cyprinodon variegatus) larvae held under normoxic (ambient air) or hypoxic (2 mg/L O2) conditions. Results demonstrated that hypoxia significantly enhances mortality observed in response to Corexit or CEWAF solutions. In the latter case, significant interactions between the two stressors were also observed. Our data supports the need to further evaluate the combined stresses imparted by hypoxia and exposure to petroleum hydrocarbons and dispersants.

No MeSH data available.


Related in: MedlinePlus

Effects of hypoxia on WAF-induced acute toxicity in sheepshead minnow larvae.WAF was prepared from Southern Louisiana Sweet Crude Oil. Statistical analysis failed to demonstrate any significant effects of either hypoxia or treatment or their interaction on larval survival (p = 0.33, p = 0.076, and p = 0.57 respectively).
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pone.0128939.g003: Effects of hypoxia on WAF-induced acute toxicity in sheepshead minnow larvae.WAF was prepared from Southern Louisiana Sweet Crude Oil. Statistical analysis failed to demonstrate any significant effects of either hypoxia or treatment or their interaction on larval survival (p = 0.33, p = 0.076, and p = 0.57 respectively).

Mentions: In contrast, no significant effects of either concentration or hypoxic treatment were observed in exposures to WAF solutions (Fig 3). Looking at all three experiments, it is clear that there appears to be no reduction in survival in response to hypoxia alone (Figs 1–3).


Hypoxia Enhances the Toxicity of Corexit EC9500A and Chemically Dispersed Southern Louisiana Sweet Crude Oil (MC-242) to Sheepshead Minnow (Cyprinodon variegatus) Larvae.

Dasgupta S, Huang IJ, McElroy AE - PLoS ONE (2015)

Effects of hypoxia on WAF-induced acute toxicity in sheepshead minnow larvae.WAF was prepared from Southern Louisiana Sweet Crude Oil. Statistical analysis failed to demonstrate any significant effects of either hypoxia or treatment or their interaction on larval survival (p = 0.33, p = 0.076, and p = 0.57 respectively).
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4482444&req=5

pone.0128939.g003: Effects of hypoxia on WAF-induced acute toxicity in sheepshead minnow larvae.WAF was prepared from Southern Louisiana Sweet Crude Oil. Statistical analysis failed to demonstrate any significant effects of either hypoxia or treatment or their interaction on larval survival (p = 0.33, p = 0.076, and p = 0.57 respectively).
Mentions: In contrast, no significant effects of either concentration or hypoxic treatment were observed in exposures to WAF solutions (Fig 3). Looking at all three experiments, it is clear that there appears to be no reduction in survival in response to hypoxia alone (Figs 1–3).

Bottom Line: The goal of this study was to examine the combined effects of hypoxia and exposure to contaminants associated with oil spills.We evaluated the effects of short term (48 hr) exposures to Corexit EC9500A, water accommodated fractions (WAF), and chemically enhanced water accommodated fractions (CEWAF) prepared from Southern Louisiana Sweet Crude Oil (MC 242) on survival of sheepshead minnow (Cyprinodon variegatus) larvae held under normoxic (ambient air) or hypoxic (2 mg/L O2) conditions.In the latter case, significant interactions between the two stressors were also observed.

View Article: PubMed Central - PubMed

Affiliation: School of Marine and Atmospheric Sciences, Stony Brook University, Stony Brook, New York, United States of America.

ABSTRACT
Oil exploration and production activities are common in the northern Gulf of Mexico as well as many other coastal and near coastal areas worldwide. Seasonal hypoxia is also a common feature in the Northern Gulf, and many other coastal areas, which is likely to increase in severity and extent with continuing anthropogenic nutrient inputs. Hypoxia has well established physiological effects on many organisms, and it has been shown to enhance the toxicity of polycyclic aromatic hydrocarbons (persistent components of petroleum) in fish. The goal of this study was to examine the combined effects of hypoxia and exposure to contaminants associated with oil spills. We evaluated the effects of short term (48 hr) exposures to Corexit EC9500A, water accommodated fractions (WAF), and chemically enhanced water accommodated fractions (CEWAF) prepared from Southern Louisiana Sweet Crude Oil (MC 242) on survival of sheepshead minnow (Cyprinodon variegatus) larvae held under normoxic (ambient air) or hypoxic (2 mg/L O2) conditions. Results demonstrated that hypoxia significantly enhances mortality observed in response to Corexit or CEWAF solutions. In the latter case, significant interactions between the two stressors were also observed. Our data supports the need to further evaluate the combined stresses imparted by hypoxia and exposure to petroleum hydrocarbons and dispersants.

No MeSH data available.


Related in: MedlinePlus