CO2 and HCl-induced seawater acidification impair the ingestion and digestion of blue mussel Mytilus edulis
CO2 and HCl-induced seawater acidification impair the ingestion and digestion of blue mussel Mytilus edulis
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CO2 和 HCl 引起的海水酸化损害蓝贻贝的摄食和消化
DOI：
10.1016/j.chemosphere.2019.124821
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发表时间：
2019
期刊：
影响因子：
8.8
通讯作者：
You Wang
中科院分区：
文献类型：
--
作者：
Mengxue Xu;Tianli Sun;Xuexi Tang;Keyu Lu;Yongshun Jiang;Sai Cao;You Wang
人为二氧化碳排放导致海水酸化，据报道对海洋生物产生有害影响，特别是对贻贝等钙化生物。本研究进行了为期 21 天的实验，重点关注海水酸化对贻贝（Mytilus edulis）的影响，其中采用了两种酸化处理：富集 CO2 和添加 HCl。评估了两个酸化 pH 值（7.7 和 7.1）以及摄入和消化的关键生理过程的变化。为了彻底研究酸化对贻贝的影响，采用了组织病理学研究方法。结果表明：（1）CO2富集或HCl添加引起的海水酸化损害了鳃结构。透射电子显微镜（TEM）结果表明，最明显的影响是炎症病变和水肿，而与 HCl 处理的标本相比，CO2 处理组出现了更明显的改变，包括内质网水肿、核浓缩和染色质板状浓缩。 CO2组的纤毛活动同时受到显着抑制，导致食物摄入障碍。 (2)海水酸化对消化腺结构造成显着破坏，淀粉酶、蛋白酶和脂肪酶的酶活性显着降低，可能表明消化受到抑制。 CO2组引起的负面影响比HCl组更严重。目前的结果表明，酸化会干扰摄入和消化过程，这可能会抑制贻贝的能量摄入。
Anthropogenic CO2emissions lead to seawater acidification that reportedly exerts deleterious impacts on marine organisms, especially on calcifying organisms such as mussels. A 21-day experiment focusing on the impacts of seawater acidification on the blue mussel,Mytilus edulis, was performed in this study, within which two acidifying treatments, CO2enrichment and HCl addition, were applied. Two acidifying pH values (7.7 and 7.1) and the alteration of the key physiological processes of ingestion and digestion were estimated. To thoroughly investigate the impact of acidification on mussels, a histopathological study approach was adopted. The results showed that: (1) Seawater acidification induced either by CO2enrichment or HCl addition impaired the gill structure. Transmission electron microscope (TEM) results suggested that the most obvious impacts were inflammatory lesions and edema, while more distinct alterations, including endoplasmic reticulum edema, nuclear condensation and chromatin plate-like condensation, were placed in the CO2-treated groups compared to HCl-treated specimens. The ciliary activity of the CO2group was significantly inhibited simultaneously, leading to an obstacle in food intake. (2) Seawater acidification prominently damaged the structure of digestive glands, and the enzymatic activities of amylase, protease and lipase significantly decreased, which might indicate that the digestion was suppressed. The negative impacts induced by the CO2group were more severe than that by the HCl group. The present results suggest that acidification interferes with the processes of ingestion and digestion, which potentially inhibits the energy intake of mussels.