| Summary: | 利用实验生态学的方法研究了由二氧化碳和盐酸引起的海水酸化对几种桡足类的急性毒性,计算了24和48 HlC50(以PH值表示).结果表明:二氧化碳酸化条件下,几种桡足类的24和48 HlC50分别为PH 5.85--6.49和PH 5.93--6.69;盐酸酸化条件下,24和48 HlC50分别为PH 5.02--5.69和PH 5.25--6.12.裂区设计方差分析表明,二氧化碳酸化对桡足类的毒性显著高于盐酸酸化的毒性.此外,各种桡足类对海水酸化的耐受性具有高度的种类特异性:营底栖生活的日本虎斑猛水蚤的耐受性明显高于其他浮游性种类;在营浮游性生活的种类中,植食性种类(中华哲水蚤)对酸化的耐受性要高于杂食性和肉食性种类.本研究结果为进一步研究海水酸化对桡足类生理生化影响提供参考依据. The acute toxicity of ocean acidification induced by CO2 or HCl on several marine copepods was investigated by using the experimental ecological method.The results showed that,the 24 h and 48 h LC50 of copepods were pH 5.85 to 6.49 and pH 5.93 to 6.69 in the CO2-driven acidification groups,while were pH 5.02 to 5.69 and pH 5.25 to 6.12 in the HCl-driven groups.The split plot ANOVA indicated that the acute toxicity of CO2-induced acidification on the copepods was significant higher than that of HCl-induced acidification.Furthermore,the sensitivity of copepods to seawater acidification was species-specific.The benthic copepod,Tigriopus japonicus,had higher tolerance to seawater acidification than the planktonic ones,and the herbivorous copepod,Calanus sinicus,had higher tolerance than the omnivorous and carnivorous copepods among the planktonic copepods.The obtained data also provide important reference for the further study on the impacts of ocean acidification on the physiological and biochemical of copepods. 海洋公益性行业科研专项项目(200805029)
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