DDT对火腿伪镖水蚤(Pseudodiaptomus poplesia)急性和慢性毒性效应

Acute and chronic effects of DDT on Pseudodiaptomus poplesia.

为探讨内分泌干扰物DDT对海洋桡足类生物所产生的生物效应,研究了DDT对火腿伪镖水蚤(Pseudodiaptomus poplesia)的急性毒性作用及其在3.5、35、350ng.L-1浓度下对火腿伪镖水蚤变态率、存活率、繁殖力、性别比和体长的影响。结果表明:DDT对火腿伪镖水蚤48hLC50和96hLC50分别为6.75和3.53μg.L-1;各浓度DDT均引起火腿伪镖水蚤幼体变态率的降低;350ng.L-1DDT条件下,火腿伪镖水蚤的存活率、产卵率和抱卵雌体比率均显著降低;各浓度DDT对火腿伪镖水蚤的性别比和体长均未造成显著影响。依据本研究结果,结合目前所报道的近岸水体有机氯农药的污染状况,可以推断,DDT对近海桡足类生物造成的生态风险较高。

To investigate the biological effects of DDT,one of the endocrine disrupting chemicals,on marine copepods,this paper studied the acute toxicity and sub-lethal effect of DDT on Pseudodiaptomus poplesia,and measured the metamorphosis,survival,fecundity,sex ratio,and body length of P.poplesia exposed to 3.5,35,and 350 ng·L-1 of DDT.The 48 h LC50 and 96 h LC50 were 6.75 μg·L-1 and 3.53 μg·L-1,respectively.When exposed to each concentration DDT,the P.poplesia showed a reduced metamorphosis rate in the first generation.At 350 ng·L-1 of DDT,the survival,egg production,and the percentage of gravid females all reduced.No significant effects were observed in the sex ratio and body length of P.poplesia exposed to each concentration DDT.Based on these results and the literatures about nearshore water body organochlorine pesticides pollution,it was deduced that DDT could cause high ecological risk to nearshore copepods.