墨西哥加利福尼亚湾两个区域滤食性鲸鲨（Rhincodon typus）体内的汞和硒。
Mercury and selenium in the filter-feeding whale shark (Rhincodon typus) from two areas of the Gulf of California, Mexico.
机构信息
Instituto Politécnico Nacional, Centro Interdisciplinario de Ciencias Marinas, Av. IPN s/n, 23096 La Paz, BCS, Mexico.
Unidad Académica Mazatlán, Instituto de Ciencias del Mar y Limnología, Universidad Nacional Autónoma de México, Mazatlán, Sinaloa 82040, Mexico.
出版信息
Mar Pollut Bull. 2019 Sep;146:955-961. doi: 10.1016/j.marpolbul.2019.07.017. Epub 2019 Jul 29.
Mercury and selenium were measured for first time in the endangered species whale shark (Rhyncodon typus) from two areas of the Gulf of California, Bahía Los Angeles (BLA) and Bahía La Paz (LAP) using dermal biopsies of seventy specimens. Additionally, nineteen zooplankton samples from LAP were analysed. Concentrations (ng/g, wet weight (ww)) in biopsies of BLA ranged from 1 to 40 for Hg and 100 to 680 for Se; while in LAP varied from 1 to 9 for Hg and 11 to 850 for Se. A positive correlation was found for Hg in BLA males biopsies with length. Hg and Se concentrations in the zooplankton from LAP were 1.6 ± 1.8 and 770 ± 930 ng/g, respectively. Hg biomagnification factor ranged from 0.8 to 5.3 in sharks. A molar excess of Se over Hg was found in the biopsies and the zooplankton.
首次使用皮肤活检的方法，对来自加利福尼亚湾两个地区（拉巴斯湾和洛杉矶湾）的濒危物种鲸鲨（Rhyncodon typus）中的汞和硒进行了测量，共检测了 70 个样本。此外，还分析了来自拉巴斯湾的 19 个浮游动物样本。拉巴斯湾样本的汞浓度范围为 1-40ng/g（湿重），硒浓度范围为 100-680ng/g；而在洛杉矶湾，汞浓度范围为 1-9ng/g，硒浓度范围为 11-850ng/g。研究发现，拉巴斯湾雄性鲸鲨皮肤活检中汞浓度与体长呈正相关。拉巴斯湾浮游动物中的汞和硒浓度分别为 1.6±1.8ng/g 和 770±930ng/g。在鲨鱼体内，汞的生物放大系数范围为 0.8-5.3。在活检样本和浮游动物中都发现了硒对汞的过量摩尔比。
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