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| 短期酸化对魁蚶摄食、呼吸代谢及能量收支的影响 |
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薛素燕1,2, 李加琦1,2, 李阳1, 丁敬坤1, 徐涵1, 张雯雯1, 毛玉泽1,2, 方建光1
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1.中国水产科学研究院黄海水产研究所 农业农村部海洋渔业可持续发展重点实验室 山东省渔业资源与生态环境重点实验室 青岛 266071;2.青岛海洋科学与技术试点国家实验室海洋生态与环境科学功能实验室 青岛 266071
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| 摘要: |
| 采用实验生态学方法，研究了魁蚶(Scapharca broughtonii)摄食、呼吸代谢及能量收支对短期酸化(pH分别为8.2、7.9、7.6)的响应。结果显示，魁蚶的摄食率(IR)和排粪率(FER)均受pH影响显著(P<0.05)，都随pH的降低而减少；魁蚶的耗氧率(OR)受pH影响显著(P<0.05)，随pH降低呈明显的下降趋势，表明低pH在一定程度上抑制魁蚶的呼吸；排氨率(NR)受pH影响不显著，随pH的降低呈先下降再上升的趋势；O : N值随pH的降低而减小。不同pH条件下的能量收支结果显示，魁蚶的摄食能、呼吸能、排粪能和生长余力(SFG)均随pH的降低而减少。通过建立能量收支方程发现，pH显著影响魁蚶的能量分配(P<0.05)，随pH的降低，魁蚶的呼吸能和排泄能占摄食能的比例增加，而排粪能和生长能占比减少，说明低pH条件下，魁蚶会做出适当生理调整降低IR，增加代谢率，导致能量减少，继而造成SFG减少。研究表明，短期酸化条件下，魁蚶的摄食和新陈代谢显著降低，可能是细胞能量需求的增加和氮损失的协同作用。 |
| 关键词: 魁蚶 pH 摄食 呼吸代谢 能量收支 |
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| Effects of Short-Term Acidification on Feeding, Respiratory Metabolism, and Energy Budget of Scapharca broughtonii |
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XUE Suyan1,2, LI Jiaqi1,2, LI Yang1, DING Jingkun1, XU Han1, ZHANG Wenwen1, MAO Yuze1,2, FANG Jianguang1
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1.Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Key Laboratory of Sustainable Development of Marine Fisheries, Ministry of Agriculture and Rural Affairs, Shandong Provincial Key Laboratory of Fishery Resources and Eco-Environment, Qingdao 266071;2.Laboratory for Marine Ecology and Environmental Science, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266071
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| Abstract: |
| Ocean acidification is one of the major changes in marine ecosystem in this century. This has a negative effect on the fertilization, development, growth, and survival of marine mollusks. Presently, physiological effects of ocean acidification on some economic shellfish are not clear. To study the effects of ocean acidification on the physiological ecology of economic shellfish is of great significance for environmental science, ecology, and aquaculture. The feeding, respiratory metabolism, and energy budget of Scapharca broughtonii at different pH levels (pH 8.2~7.6) were studied in the laboratory. The results showed that the feeding and defecation rates of S. broughtonii were significantly (P<0.05) affected by pH, and there was a declining trend on the feeding and defecation rates with a decrease in pH value. The oxygen consumption rate was also significantly (P<0.05) affected by pH, showing an obvious downward trend with decreasing pH value. There was an initial decrease in ammonia excretion rate, which then increased with a decrease in pH value. O : N ratio at low pH value was lower than that of normal seawater, indicating that low pH value could inhibit the respiratory metabolism of S. broughtonii to some extent. The energy budget at different pH values indicated that energy ingestion, respiratory consumption, fecal energy loss, and energy absorbed in the growth process all decreased with a decrease in pH value. Interestingly, energy loss during excretion decreased first and then increased. According to energy budget equation, we found that pH had a significant effect on energy distribution of S. broughtonii (P<0.05). As the pH value decreases, the proportion of energy consumed during respiration and excretion increases, while the proportion involved in excrement and growth decreases. Under low pH conditions, S. broughtonii will make appropriate physiological adjustments to reduce the feeding rate and increase the metabolic rate, resulting in a decrease in energy, which leads to a decrease in energy deposition in the growth process. This study suggested that the feeding and metabolism of S. broughtonii decreased significantly under short-term acidification, which may be a synergistic effect of increased cell energy demand and nitrogen loss. |
| Key words: Scapharca broughtonii pH Feeding Respiratory metabolism Energy budget |