Department of Marine Sciences, Berhampur University, Berhampur, Odisha, 760007, India.
Redox Regulation Laboratory, Department of Zoology, College of Basic Science and Humanities, Odisha University of Agriculture and Technology, Bhubaneswar, Odisha, 751003, India.
Environ Sci Pollut Res Int. 2021 Jun;28(22):28275-28288. doi: 10.1007/s11356-021-12601-w. Epub 2021 Feb 3.
Accumulation of heavy metals in zooplanktons is used as an essential tool for the evaluation of health of an ecosystem. Such data are used to set further monitoring strategies especially in (coastal) water bodies. In the present study, seasonal bioaccumulation of heavy metals such as Cu, Zn, Pb, Cd and Hg, organic loads such as nitrite and phosphate, contents loads and physicochemical parameters in Haripur creek along the Bay of Bengal in east coast of India is measured in zooplanktons. Coastal organisms are considered an integral part of marine ecosystems and their frequent massive die-off events along the coast of the Bay of Bengal are correlated with the obtained pollutant data. The levels of heavy metals were also correlated with several extrinsic environmental factors such as water transparency, dissolved oxygen, salinity, pH and temperature. Discriminant function analyses and standardised coefficients for canonical variables for the obtained data indicate that the studied environmental factors and organic loads varied as a function of season. Bioaccumulation of the studied heavy metals in zooplanktons was seasonal and infrequently noticed above the standard limit. The computed bioaccumulation factor of the five metals showed that accumulation of Zn was higher in zooplanktons as compared to that of the other studied metals. So, the entry of heavy metals through the food chains or via direct exposure (to organic loads also) to the other inhabiting organisms including fish may be assumed. This could be one of the possible reasons for the observed frequent (fish) die-off events at Gopalpur Coast along the Bay of Bengal and may be considered a clue for future investigations.
浮游动物体内重金属的积累被用作评估生态系统健康的重要工具。这些数据被用来制定进一步的监测策略，特别是在（沿海）水体中。本研究测量了印度东海岸孟加拉湾沿岸 Haripur 溪中的浮游动物体内重金属（如铜、锌、铅、镉和汞）、有机负荷（如亚硝酸盐和磷酸盐）、含量负荷和理化参数的季节性生物积累。沿海生物被认为是海洋生态系统的一个组成部分，它们在孟加拉湾沿岸经常大量死亡与所获得的污染物数据有关。重金属的水平也与水透明度、溶解氧、盐度、pH 值和温度等几个外在环境因素相关。所得数据的判别函数分析和典型变量的标准化系数表明，所研究的环境因素和有机负荷随季节而变化。浮游动物体内重金属的生物积累具有季节性，很少超过标准限制。所研究的五种金属的生物积累因子的计算表明，与其他研究的金属相比，锌在浮游动物体内的积累更高。因此，可以假设重金属通过食物链或通过直接暴露（也包括有机负荷）到其他栖息生物（包括鱼类）进入。这可能是观察到在孟加拉湾沿岸戈帕尔布尔海岸频繁（鱼类）死亡事件的原因之一，也可能被视为未来调查的线索。
