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Exposure of adult sea urchins to sunken heavy fuel oil affects the reproductive status and the development of their offspring |
DUAN Mei-na1, LIU Yong-jiang1, BAI Xue1, GAO Xiang1, ZHANG Xin-xin2, XIONG De-qi1 |
1. Department of Environmental Science and Engineering, Dalian Maritime University, Dalian 116026, China;
2. Technology of Oily Sludge Eco-Treatment, Dalian 116000, China |
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Abstract The present study investigated effects of exposure to sunken heavy fuel oil (HFO) on the fecundity, gamete quality and development of the offspring in the sea urchin Strongylocentrotus intermedius. Adult sea urchins were exposed to effluents from HFO-oiled gravel columns for 7days to simulate an oil contaminated gravel shore. The spawning ability of adults and the fecundity ((1957917±811471) eggs) of females significantly decreased (P=0.033 and P=0.036, respectively). No effect was observed on the egg size and fertilization success. However, a significant increase in the percentage of abnormality of the offspring were observed, demonstrating that parental exposure (especially paternal exposure) had adverse effects on the offspring. The offspring from exposed fathers showed higher ITI values (ITI values of 24 and 48h offspring were 0.82~1.95 and 1.89~4.04, respectively) with a higher number of malformed embryos compared to maternal exposure (ITI values of 24 and 48h offspring were 0.54~1.45 and 1.1~2.57, respectively), indicating that detrimental effects of sunken HFO on the early development of sea urchin embryos may be largely attributed to paternal effects.
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Received: 10 May 2018
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