Marine Biological Station, National Institute of Biology, Fornace, 41 6330 Piran, Slovenia.
Department Environmental Sciences, Jozef Stefan Institute, Jamova, 39 1000 Ljubljana, Slovenia.
Nutrients. 2018 Feb 28;10(3):278. doi: 10.3390/nu10030278.
Since the environmental levels of selenium (Se) can moderate the bioaccumulation and toxicity of mercury (Hg) in marine organisms, their interactions were studied in seawater, sediments, plankton and the benthic (Bull ray , Eagle ray ) and the pelagic (Pelagic stingray ) rays, as apex predators in the Gulf of Trieste (Northern Adriatic Sea). Male and female rays showed no difference in the Se contents in muscle tissue. Pelagic species contained higher Se levels in muscle but slightly lower levels in the livers of both genders. The Hg/Se ratios in seawater dissolved and colloidal fractions, plankton and sediment were <0.5, while those in particulate matter were <1.3. In benthic ray species, a parallel increase in Se and Hg in muscle was observed, so that an increased in Hg (MeHg) bioaccumulation results in Se coaccumulation. The Hg/Se ratios (molar) in muscle and liver of pelagic and benthic rays were <1.4 and <0.7, respectively. The low levels of Hg in muscle and liver in all the ray species corresponded to low Hg/Se ratios and increases in muscle and liver to 1 at 7 µg/g, dry weight (dw) and 5 µg/g dw, respectively, i.e., about 1.6 µg/g wet weight (ww).
由于环境中的硒 (Se) 水平可以调节海洋生物体内汞 (Hg) 的生物积累和毒性，因此在亚得里亚海北部的的里雅斯特湾，对海水中、沉积物中、浮游生物中和底栖（牛鼻鲼、鹰鲼）和洄游（宽尾魟）这两种顶级掠食者的硒 (Se) 和汞 (Hg) 之间的相互作用进行了研究。雌雄魟鱼肌肉组织中的硒含量没有差异。洄游物种肌肉中的硒含量较高，但两性的肝脏中的硒含量略低。海水中溶解态和胶体态、浮游生物和沉积物中的 Hg/Se 比值<0.5，而颗粒态中的 Hg/Se 比值<1.3。在底栖魟鱼物种中，观察到肌肉中硒和汞的平行增加，因此汞 (MeHg) 的生物积累增加导致硒的共积累。洄游和底栖魟鱼的肌肉和肝脏中的 Hg/Se 比值（摩尔）分别<1.4 和 <0.7。所有魟鱼肌肉和肝脏中的汞含量均较低，对应的 Hg/Se 比值也较低，当肌肉和肝脏中的硒含量分别增加到 7 µg/g 干重 (dw) 和 5 µg/g dw 时，即约 1.6 µg/g 湿重 (ww) 时，Hg/Se 比值增加到 1。
