标题：Influence of a Marine Diatom on the Embryonic Toxicity of 17α-Ethynylestradiol to the Abalone Haliotis diversicolor supertexta
作者：Ying Liu;Nora Feng Yee Tain;Yuntao Guan;Baoyu Gao
作者机构：[Liu, Y] Shandong Provincial Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong U 更多
通讯作者地址：[Guan, YT]Tsinghua Univ, Res Ctr Environm Engn & Management, Grad Sch Shenzhen, Shenzhen 518055, Peoples R China.
来源：Water, air and soil pollution
关键词：environmental estrogen;acute toxicity;dietary exposure;navicula incerta;biodegradation;bioaccumulation
摘要：The embryos of a marine abalone, Haliotis diversicolor supertexta, were exposed to a typical environmental estrogen, 17α-ethynylestradiol (EE2), for 96 h, to examine the acute toxicity of EE2 to the embryogenesis of the abalone. A marine diatom, Navi-cula incerta, was used in the test media as settlement substrate and food for the abalone larvae. During the embryo culture, more than 30 % of EE2 could be removed from the test media by the diatom, mainly via biodegradation, leading to a decrease of water-borne exposure dose. Further, the exposure concentrations of EE2 around the living microenvironment of the abalone larvae could be magnified 350-468 times after the larvae settled on the diatom, as indicated by the biocon-centration factors of EE2 in the diatom. Increased bioaccumulation of EE2 in the diatom caused greater inhibition on the metamorphosis of the abalone larvae by enhancing the uptake of EE2 in the larvae via dietary exposure, while declined water-borne exposure dose did not affect the embryonic toxicity of EE2 and its uptake in the abalone larvae. The 96-h median effective concentration of EE2 to the metamorphosis of the abalone larvae was 10.01 μg L~(-1), when the exposure doses in both the test media and the diatom were controlled stable. The 96-h hazard concentration for 5 % of the species was 1.20 μg L~(-1), which was still higher than but close to the reported upper contamination level of EE2 and could be employed as the safety threshold for the metamorphosis of the abalone embryos.