| 摘要: |
| 通过观察不同饥饿胁迫处理对三疣梭子蟹（Portunus trituberculatus）溞状I期幼体变态和发育的影响，研究了其“营养储存饱和点”(the point of reserve saturation，PRS)和“不可恢复点”（the point of no return，PNR）现象的发生情况。结果表明：以轮虫为饵料，三疣梭子蟹溞状I期幼体（ZI）在前期投喂后期饥饿的条件下，随着前期摄食时间的增加，幼体变态率和发育速度呈上升趋势，50%营养储存饱和点（PRS50）出现在47.5 h，100%营养储存饱和点（PRS100）出现在72 h；在前期饥饿后期投喂的条件下，随着前期饥饿时间的增加，幼体变态率和发育速度呈下降趋势，50%不可恢复点（PNR50）出现在39 h，100%不可恢复点（PNR100）出现在56 h。
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| 关键词: 三疣梭子蟹（Portunus trituberculatus) 溞状Ⅰ期幼体 饥饿 PRS PNR |
| DOI： |
| 分类号: |
| 基金项目:国家科技支撑计划项目（2006BAD09A01） |
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| Starvation experiments with the larvae of Portunus trituberculatus in zoea stage Ⅰ |
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CUI Kuo-peng,MA Shen
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| Abstract: |
| The effects of starvation on development and survival of the larvae of Portunus trituberculatus in zoea stage I (ZI) were investigated in the experiments. The results of Point of Reserve Saturation (PRS) experiment showed that the durations of both development and molting of the ZI larvae were shortened with the initial feeding periods extended. The point of PRS50 reached when 50% of the larvae molted successfully with the initial feeding periods lasted 47.5 hours. After maintaining the initial feeding for 72 hours, most of the ZI larvae molted successfully and the point of PRS100 was indicated. The results of Point of No Return (PNR) experiment showed that the durations of the point of PRS100 indicated both development and mortality of the ZI larvae increased with the initial starvation periods extended. There were 50% of the larvae lost their ability to molt after refeeding performance with the initial starvation for 39 hours which indicated the point of PNR50. All the ZI larvae lost their ability to molt when suffered from the initial starvation for 56 hours, which was the point of PNR100 for the ZI larvae of P. trituberculatus.
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| Key words: Portunus trituberculatus zoea larvae stage Ⅰ starvation PRS PNR |
