邻苯二甲酸二丁酯对海洋微藻生长的影响Effects of Dibutyl Phthalate( DBP) on the Growth of Marine Microalgae
黄博珠;何瑞;孙凯峰;段舜山;徐宁;
摘要(Abstract):
近年来,内陆和近海水体中的一种典型环境激素邻苯二甲酸二丁酯(DBP)含量显著上升,但其对海洋生态系统的影响并不明确。本研究选取7种海洋微藻为实验材料,包括1种甲藻(东海原甲藻Prorocentrum donghaiense),2种定鞭藻(小普林藻Prymesium parvum和球形棕囊藻Phaeocystis globosa),2种硅藻(中肋骨条藻Skeletonema costatum和三角褐指藻Phaeodactylum tricornutum),以及1种隐藻(红胞藻Rhodomonus salina)和1种绿藻(海洋小球藻Chlorella sp.),设置5个DBP暴露浓度(5、10、20、50、100μg·L-1),研究其对海洋微藻生长的影响,并探索DBP暴露对微藻抗氧化系统和光合系统的影响。结果表明:在所有暴露组中,球形棕囊藻、小普林藻、东海原甲藻、红胞藻、海洋小球藻生长速率显著增加;5~20μg·L-1的DBP暴露下中肋骨条藻不受影响,50、100μg·L-1下受到抑制;所有DBP暴露组对三角褐指藻没有显著影响。在50μg·L-1DBP暴露下,随着时间的延长,球形棕囊藻的SOD、CAT、MDA均表现出先升高后下降的趋势,第7天藻的叶绿素a、叶绿素b,类胡萝卜素含量较对照组分别增加了23%、10%、48%,球形棕囊藻光系统II(PSII)的最大光能转化效率(Fv/Fm)、PSII的潜在活性(Fv/F0)、光合性能指数PI分别增加了4.8%、16%、69%。研究发现DBP对海洋微藻的影响具有种间差异性,能够显著促进有害赤潮藻球形棕囊藻的生长,近岸水体DBP含量的增加可能改变浮游植物群落组成,进而增加有害藻华暴发的风险。
关键词(KeyWords): 邻苯二甲酸二丁酯;海洋微藻;生长速率;超氧化物歧化酶(SOD);过氧化氢酶(CAT);丙二醛(MDA);光合色素
基金项目(Foundation): 国家自然科学基金项目(41576159,21307140,U1133003)
作者(Author): 黄博珠;何瑞;孙凯峰;段舜山;徐宁;
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DOI:
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