大规模牡蛎养殖加速了桑沟湾海水中溶解无机碳的去除。

IF 3 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Marine environmental research Pub Date : 2024-10-17 DOI:10.1016/j.marenvres.2024.106798

Jiaqi Li , Zengjie Jiang , Meng Zhang , Xin Sun , Minghui Jiao , Jiamin Li , Suyan Xue , Ang Li , Longzhen Liu , Ling Zhu , Yuze Mao

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引用次数: 0

摘要

尽管牡蛎钙化和呼吸对海水无机碳系统的直接影响已广为人知，但其通过滤食活动产生的间接影响仍不清楚。在此，我们研究了大规模牡蛎养殖对海水中溶解性无机碳（DIC）去除的影响。实地调查显示，中国桑沟湾牡蛎养殖区的 DIC 水平明显低于非养殖区。实验室培养表明，无论在高透明度还是低透明度环境中培养，牡蛎养殖区海水的 DIC 去除率都明显高于非养殖区。这些结果表明，养殖牡蛎促进了养殖区海水 DIC 的去除。为了揭示滤食活动对去除 DIC 的间接影响，我们使用 6 立方米的池塘来模拟牡蛎养殖环境。结果显示，经过六天的养殖，养殖牡蛎组的平均 DIC 水平比对照组（未养殖牡蛎）低 105.83 μmol/kg。令人惊讶的是，在实验结束时，牡蛎养殖组的 Chl-a 平均浓度明显高于对照组。同样，与对照组相比，养殖牡蛎 12～20 小时的海水中 DIC 含量下降更快，而 Chl-a 浓度上升更快。我们注意到，在养殖牡蛎数小时后，6 立方米池塘内海水的透明度显著增加。透明度的提高创造了有利的光环境，支持浮游植物的光合作用，同时加快了 DIC 的去除率。总之，牡蛎不仅能通过钙化作用去除海水中的无机碳，还能通过其过滤活动为浮游植物的光合作用创造适宜的环境，从而加速牡蛎养殖区海水中无机碳的去除。

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Large-scale oyster farming accelerates the removal of dissolved inorganic carbon from seawater in Sanggou Bay

While the direct impact of oyster calcification and respiration on the seawater inorganic carbon system is well-acknowledged, their indirect effect through filter feeding activities remains unclear. Here we studied the impact of large-scale oyster farming on the removal of dissolved inorganic carbon (DIC) from seawater. Field investigations showed that the DIC level in the oyster farming area in Sanggou Bay, China were significantly lower than that in the non-farming area. In-lab incubation showed that regardless of whether incubated in high or low-transparent environments, the DIC removal rate of seawater from the oyster farming area was significantly higher than that of the non-farming area. These results indicate that cultivated oysters facilitate the removal of seawater DIC in the farming area. To reveal the indirect effect of filter feeding activities on DIC removal, we used 6-m³ ponds to simulate the oyster-farming environment. Results showed that the average DIC level of the oyster-cultivating groups was 105.83 μmol/kg lower than that of the control groups (without of oyster) after a six-day cultivation. Surprisingly, the average concentration of Chl-a in oyster-cultivating groups was significantly higher than that of the control group at the end of the experiment. Similarly, DIC level declined faster while Chl-a concentration increased faster in seawater that previously experienced 12～20 h of oyster cultivation than that in the control seawater. It was noticed that the transparency of seawater within 6-m³ ponds increased significantly just after hours of oyster cultivation. This enhanced transparency created a favorable light environment that supported phytoplankton photosynthesis and simultaneously accelerated the DIC removal rate. Overall, oysters not only remove the inorganic carbon in the seawater through calcification but also create a suitable environment for phytoplankton photosynthesis through their filtering activity, and subsequently accelerating the removal of inorganic carbon in the seawater of the oyster farming area.

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来源期刊

Marine environmental research 环境科学-毒理学

CiteScore

5.90

自引率

3.00%

发文量

217

审稿时长

46 days

期刊介绍： Marine Environmental Research publishes original research papers on chemical, physical, and biological interactions in the oceans and coastal waters. The journal serves as a forum for new information on biology, chemistry, and toxicology and syntheses that advance understanding of marine environmental processes. Submission of multidisciplinary studies is encouraged. Studies that utilize experimental approaches to clarify the roles of anthropogenic and natural causes of changes in marine ecosystems are especially welcome, as are those studies that represent new developments of a theoretical or conceptual aspect of marine science. All papers published in this journal are reviewed by qualified peers prior to acceptance and publication. Examples of topics considered to be appropriate for the journal include, but are not limited to, the following: – The extent, persistence, and consequences of change and the recovery from such change in natural marine systems – The biochemical, physiological, and ecological consequences of contaminants to marine organisms and ecosystems – The biogeochemistry of naturally occurring and anthropogenic substances – Models that describe and predict the above processes – Monitoring studies, to the extent that their results provide new information on functional processes – Methodological papers describing improved quantitative techniques for the marine sciences.