| 摘要: |
| 人工栽培的坛紫菜（Pyropia haitanensis）具有重要的经济意义和生态功能，非常有必要研究海洋酸化对坛紫菜的影响。本研究通过充入高CO2浓度（1 000×10-6）的空气模拟海洋酸化，探讨了不同接种密度条件下海洋酸化对坛紫菜叶状体的生理生态学效应。结果表明，长约1 cm的叶状体接种密度从1株/dm3 提高到3株/dm3 时，比生长速率显著降低了14.8%。低接种密度条件下，海洋酸化导致比生长速率降低了6.7%。相反，高接种密度条件下，海洋酸化导致坛紫菜的比生长速率增加了6.7%。这表明，海洋酸化能部分缓解提高接种密度导致的负面影响。无论何种接种密度，海洋酸化对最大光化学量子产量（Fv/Fm）、总蛋白含量和色素蛋白含量以及藻体组织中碳、氮和磷含量均无显著影响；但显著降低颗粒有机碳（POC）的释放量。特别地，在低接种密度条件下，海洋酸化显著提高了溶解有机碳（DOC）的释放量，增幅为70.2%。综上，海洋酸化对坛紫菜叶状体的碳积累速率和有机物释放的影响依赖于接种密度。 |
| 关键词: 海洋生物学 坛紫菜 海洋酸化 叶状体培养 有机物释放 |
| DOI：10.3969/J.ISSN.2095-4972.2022.01.004 |
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| 基金项目:国家自然科学基金资助项目 (41806183)；蓝色粮仓重点研发任务资助项目 (2018YFD0900702)；现代农业产业技术体系专项资助项目 (CARS-50)；集美大学李尚大基金资助项目；集美大学国家基金培育计划资助项目；福建省教育厅面上资助项目(JT180273) |
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| Effects of ocean acidification on the thallus eco-physiology of Pyropia haitanensis incubated in different densities |
| TIAN Yingying, XU Kai, WANG Wenlei, XU Yan, 〖JZ〗JI Dehua, CHEN Changsheng, XIE Chaotian,XU Kai,WANG Wenlei,XU Yan,JI Dehua,CHEN Changsheng,XIE Chaotian |
| (College of Fisheries, Jimei University, Xiamen 361021, China) |
| Abstract: |
| It is necessary to study the effect of ocean acidification (OA) on Pyropia haitanensis which is an important economic species ecologically. In this study, we investigated the physiological and ecological effects of ocean acidification on P. haitanensis thalli by simulating ocean acidification with an aerated culture of CO2 enriched-air (1 000×10-6).The results showed that the specific growth rate was significantly decreased by 14.8% when incubation density of 1 cm thallus increased from one thallus per litre to three thalli per litre. At condition with low incubation densities, OA reduced the specific growth rate by 6.7%. On the contrary, at condition with higher incubation densities, OA increased the specific growth rate by 6.7%. This suggests that higher density incubation can partially alleviate the negative effects of OA. Regardless of the incubation density, OA did not affect significantly on Fv/Fm, total protein content, pigment content, and carbon, nitrogen and phosphorus contents of algal tissue while it significantly reduced the release of particulate organic carbon (POC). In particular, under lower density incubation, OA increased significantly the release of dissolved organic carbon (DOC) by 70.2%. In summary, the effects of OA on the carbon accumulation rate and organic matter release from the thalli were dependent on the incubation density. |
| Key words: marine biology Pyropia haitanensis ocean acidification thallus incubation release of organic matter |
