Previous studies have shown that oil contaminants may seriously harm scleractinian corals, with effects
ranging from sub-lethal responses including reduced reproductive success, to mortality of corals.
However, information on the specific toxicity of oil and dispersed oil to coral larvae is very limited. This
study examined the effects of the water accommodated fraction (WAF) of fuel oil, dispersed fuel oil, and
Ardrox 6120 dispersant on the survivorship of Acropora tenuis, Goniastrea aspera, and Platygyra
sinensis scleractinian coral larvae. The results showed that dispersed oil and dispersant are far more toxic
than undispersed oil WAF to the survivorship of these larvae. The concentrations of dispersed oil and
dispersant causing high levels of mortality were well within the range that may be expected in the vicinity
of an oil slick that has been chemically dispersed. These results clearly demonstrate that coral
reproductive success will be significantly impaired if coral larvae encounter chemically dispersed oil or
dispersant. Therefore, dispersants should not be used in the vicinity of coral reefs during coral spawning
episodes or the subsequent planktonic larval development phase.
Previous studies have shown that oil contaminants may seriously harm scleractinian corals, with effects
ranging from sub-lethal responses including reduced reproductive success, to mortality of corals.
However, information on the specific toxicity of oil and dispersed oil to coral larvae is very limited. This
study examined the effects of the water by SavePass v2.2" style="border: none !important; display: inline-block !important; text-indent: 0px !important; float: none !important; font-weight: bold !important; height: auto !important; margin: 0px !important; min-height: 0px !important; min-width: 0px !important; padding: 0px !important; text-transform: uppercase !important; text-decoration: underline !important; vertical-align: baseline !important; width: auto !important; background: transparent !important;">accommodated fraction (WAF) of fuel oil, dispersed fuel oil, and
Ardrox 6120 dispersant on the survivorship of Acropora tenuis, Goniastrea aspera, and Platygyra
sinensis scleractinian coral larvae. The results showed that dispersed oil and dispersant are far more toxic
than undispersed oil WAF to the survivorship of these larvae. The concentrations of dispersed oil and
dispersant causing high levels of mortality were well within the range that may be expected in the vicinity
of an oil slick that has been chemically dispersed. These results clearly demonstrate that coral
reproductive success will be significantly impaired if coral larvae encounter chemically dispersed oil or
dispersant. Therefore, dispersants should not be used in the vicinity of coral reefs during coral spawning
episodes or the subsequent planktonic larval development phase.
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