Department of Zoology, Bharathiar University, Coimbatore, 641046, Tamilnadu, India.
Department of Zoology, Bharathiar University, Coimbatore, 641046, Tamilnadu, India.
Chemosphere. 2023 Dec;345:140447. doi: 10.1016/j.chemosphere.2023.140447. Epub 2023 Oct 17.
Ocean acidification (OA) and heavy metal pollution in marine environments are potentially threatening marine life. The interactive effect of OA and heavy metals could be more vulnerable to marine organisms than individual exposures. In the current study, the effect of OA on the toxicity of cadmium (Cd) in the crab Scylla serrata was evaluated. Crab instars (0.07 cm length and 0.1 g weight) were subjected to pH 8.2, 7.8, 7.6, 7.4, 7.2, and 7.0 with and without 0.01 mg l of Cd for 60 days. We noticed a significant decrease in growth, molting, protein, carbohydrate, amino acid, lipid, alkaline phosphatase, and haemocytes of crabs under OA + Cd compared to OA treatment. In contrast, the growth, protein, amino acid, and haemocyte levels were significantly affected by OA, Cd, and its interactions (OA + Cd). However, superoxide dismutase, catalase, lipid peroxidation, glutamic oxaloacetate transaminase, glutamic pyruvate transaminase, and accumulation of Cd in crabs were considerably elevated in OA + Cd treatments compared to OA alone treatments. The present investigation showed that the effect of Cd toxicity might be raised under OA on S. serrata. Our study demonstrated that OA significantly affects the biological indices and oxidative stress responses of S. serrata exposed to Cd toxicity.
海洋酸化（OA）和海洋环境中的重金属污染可能对海洋生物构成威胁。OA 和重金属的交互作用对海洋生物的影响可能比单一暴露更为脆弱。在本研究中，评估了 OA 对锯缘青蟹（Scylla serrata）体内镉（Cd）毒性的影响。蟹幼体（0.07cm 体长和 0.1g 体重）在 pH 值为 8.2、7.8、7.6、7.4、7.2 和 7.0 下，分别添加和不添加 0.01mg/L Cd，处理 60 天。我们发现，与单独 OA 处理相比，OA+Cd 处理下的蟹类生长、蜕皮、蛋白质、碳水化合物、氨基酸、脂质、碱性磷酸酶和血细胞均显著减少。相比之下，OA、Cd 及其相互作用（OA+Cd）显著影响了蟹类的生长、蛋白质、氨基酸和血细胞水平。然而，与单独 OA 处理相比，OA+Cd 处理下的超氧化物歧化酶、过氧化氢酶、脂质过氧化、谷草转氨酶、谷丙转氨酶和 Cd 在蟹体内的积累显著升高。本研究表明，在 OA 条件下，Cd 的毒性效应可能会增加。本研究表明，OA 显著影响了 S. serrata 暴露于 Cd 毒性时的生物指标和氧化应激反应。
