Impacts of B[a]P on the Development of Pinctada martensii D-shaped Veliger Larvae
苯并[a]芘对马氏珠母贝D型面盘幼虫发育的影响

Ba]P is the most studied polycyclic aromatic hydrocarbons (PAHs),which widely exists in the marine environment.Invertebrates are threatened by PAHs in their whole life.In this paper,the impacts of Ba]P on the development of D-shaped veliger larvae of Pinctada martensii were studied.When fertilized eggs growed up to D-shaped veliger larvae,they were exposed to Ba]P at six different concentrations of 0,1,2,4,10 and 15 μg·L-1.The mortality and aberration rate were calculated after D-shaped veliger larvae exposed for 12,24,36,48,72,and 84 hours.Results showed that the mortality was positive to exposure time.Ba]P has a significantly toxic effect on D-shaped veliger larvae of Pinctada martensii.Larvae in 4 and 10 μg·L-1 groups were much more sensitive than that in other groups.The morality was positive to the concentration of Ba]P in the range of 1～10 μg·L-1.Ba]P could significantly deform D-shaped veliger larvae.Moreover,exposed to high concentration of Ba]P resulted in the early appearence of the abnormal individual.Additionally,LC50 gradually decreased then kept a constant.48h-LC50 was 21.56 μg·L-1.The results indicated that Ba]P had negative effects on the developement of D-shaped veliger larvae of Pinctada martensii and their populative structure.