Antioxidant Responses of a Brackish Water Clam to Sediment Composition and Water Quality: a Field Experiment

Q3 Environmental Science

Journal of Water and Environment Technology Pub Date : 2021-01-01 DOI:10.2965/jwet.20-137

P. Pokhrel, Hiroki Machida, Shumona Akther, Jumpei Suzuki, M. Fujita

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引用次数: 1

Abstract

Field experiments were conducted at brackish-water sites (Lake Hinuma, Hinuma River, and Naka River) to investigate oxidative stress responses of a brackish-water clam, Corbicula japonica, to sediment composition and water quality. To ascertain the influence of the sediment composition, clams were subjected to three test sediments with different contents of clay/silt and organic matter from the same site. Sediment with ~33% of clay/silt content and ~10% of ignition loss exhibited decreased oxygen radical absorbance capacity (ORAC) within two weeks (p < 0.05). However, sediment with less than ~20% of clay/silt content and/or ~7% of ignition loss had no influence on ORAC (p > 0.05). To ascertain the influence of the water quality, clams were placed in baskets without sediment at four brackish-water sites. Significant differences in ORAC were observed in response to salinity and chlorophyll a (Chl a) (p < 0.05). Multiple regression analysis indicated that the levels of salinity and water temperature as well as variations in Chl a, dissolved oxygen, and turbidity for 1 d prior to the sampling date affected ORAC. We concluded that natural influencing factors need to be considered in ORAC assays for C. japonica, when anthropogenic impacts are assessed.

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咸淡水蛤对沉积物组成和水质的抗氧化反应:野外试验

在半咸水点(Hinuma湖、Hinuma河和Naka河)进行了野外实验，研究了半咸水蛤蜊Corbicula japonica对沉积物组成和水质的氧化应激反应。为了确定沉积物组成的影响，在同一地点进行了三种不同粘土/粉砂和有机质含量的试验沉积物。粘土/粉土含量为~33%、燃失量为~10%的沉积物在2周内氧自由基吸收能力(ORAC)下降(p < 0.05)。而粘土/粉粒含量低于~20%和/或燃失量为~7%的沉积物对ORAC没有影响(p > 0.05)。为了确定水质的影响，在四个咸淡水地点将蛤蜊放在没有沉淀物的篮子里。ORAC对盐度和叶绿素a (Chl a)的响应差异有统计学意义(p < 0.05)。多元回归分析表明，采样前1 d的盐度、水温、Chl a、溶解氧和浊度变化影响ORAC。我们的结论是，当评估人为影响时，在粳稻的ORAC测定中需要考虑自然影响因素。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Water and Environment Technology Environmental Science-Water Science and Technology

CiteScore

1.80

自引率

0.00%

发文量

审稿时长

43 weeks

期刊介绍： The Journal of Water and Environment Technology is an Open Access, fully peer-reviewed international journal for all aspects of the science, technology and management of water and the environment. The journal’s articles are clearly placed in a broader context to be relevant and interesting to our global audience of researchers, engineers, water technologists, and policy makers. JWET is the official journal of the Japan Society on Water Environment (JSWE) published in English, and welcomes submissions that take basic, applied or modeling approaches to the interesting issues facing the field. Topics can include, but are not limited to: water environment, soil and groundwater, drinking water, biological treatment, physicochemical treatment, sludge and solid waste, toxicity, public health and risk assessment, test and analytical methods, environmental education and other issues. JWET also welcomes seminal studies that help lay the foundations for future research in the field. JWET is committed to an ethical, fair and rapid peer-review process. It is published six times per year. It has two article types: Original Articles and Review Articles.