文章摘要
短期酸化对魁蚶摄食、呼吸代谢及能量收支的影响
Effects of short-term acidification on feeding, respiratory metabolism and energy budget of Scapharca broughtonii
投稿时间:2019-04-22  修订日期:2019-06-25
DOI:
中文关键词: 魁蚶  pH  摄食  呼吸代谢  能量收支
英文关键词: Scapharca broughtonii  pH  Feeding  Respiratory metabolism  Energy budget
基金项目:
作者单位E-mail
薛素燕 农业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 中国水产科学研究院黄海水产研究所 青岛 xuesy@ysfri.ac.cn 
李加琦 农业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 中国水产科学研究院黄海水产研究所 青岛  
李阳 农业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 中国水产科学研究院黄海水产研究所 青岛  
丁敬坤 农业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 中国水产科学研究院黄海水产研究所 青岛  
徐涵 农业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 中国水产科学研究院黄海水产研究所 青岛  
毛玉泽 农业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 中国水产科学研究院黄海水产研究所 青岛 maoyz@ysfri.ac.cn 
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中文摘要:
      采用实验生态学方法,研究了魁蚶摄食、呼吸代谢及能量收支对短期酸化 (pH 8.2、pH 7.9和pH 7.6)的响应。结果显示,魁蚶的摄食率和排粪率均受pH影响显著(p<0.05),都随pH值的降低而减少。魁蚶的耗氧率受pH影响显著(p<0.05),随pH值降低呈明显下降趋势,说明低pH会一定程度地抑制魁蚶的呼吸;排氨率受pH影响差异不显著,随pH值降低呈先降后升趋势;O:N比值随pH值降低而减小。不同pH条件下的能量收支结果显示,魁蚶的摄食能、呼吸能、排粪能和生长余力均随pH值的降低而减少。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),随着pH值降低,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摄食率,增加代谢率,导致能量减少,继而造成生长余力减少。本研究表明,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。
英文摘要:
      Ocean acidification is one of the major changes in marine ecosystem in this century, which has a negative impact on the fertilization, development, growth and survival of marine mollusks. At present, the physiological effects of ocean acidification on some economic shellfish are not clear. It is of great significance for environmental science, ecology and aquaculture to study the effects of ocean acidification on the physiological ecology of economic shellfish. The feeding, respiratory metabolism and energy budget of Scapharca broughtonii at different pH levels (pH8.2 to 7.6) were studied in the laboratory. The results showed that the feeding rate and defecation rate of S. broughtonii were significantly (p<0.05) affected by pH, and there was a declining trend on the feeding rate and defecation rate with the decrease of pH value. The oxygen consumption rate was also significantly (p<0.05) affected by pH, which showed an obvious downward trend by decreasing pH value. The ammonia excretion rate decreased first and then increased with the decrease of 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 levels indicated that energy ingestion, respiratory consumption, fecal energy loss and energy absorbed in the growth process all decreased with the decrease of pH value. Interestingly, the excretion energy loss decreased first and then increased. According to the energy budget equation, we found that pH had a significant impact on the energy distribution of S. broughtonii (p<0.05). As the pH value reduces, the proportion of energy consumed by respiration and excretion in increases, while the proportion absorbed by 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 lead 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 the synergistic effect of increased cell energy demand and nitrogen loss.
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