Ionic control of settlement and metamorphosis in the tadpole larvae of ascidian, <i>Styela canopus</i> Savigny

HUANG Ying; KE Cai-huan; FENG Dan-qing; ZHOU Shi-qiang; LI Fu-xue

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Article Navigation > Haiyang Xuebao > 2005 > 27(1): 137-144

HUANG Ying, KE Cai-huan, FENG Dan-qing, ZHOU Shi-qiang, LI Fu-xue. Ionic control of settlement and metamorphosis in the tadpole larvae of ascidian, Styela canopus Savigny[J]. Haiyang Xuebao, 2005, 27(1): 137-144.

Citation:

HUANG Ying, KE Cai-huan, FENG Dan-qing, ZHOU Shi-qiang, LI Fu-xue. Ionic control of settlement and metamorphosis in the tadpole larvae of ascidian, Styela canopus Savigny[J]. Haiyang Xuebao, 2005, 27(1): 137-144.

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Ionic control of settlement and metamorphosis in the tadpole larvae of ascidian, Styela canopus Savigny

1.
Department of Oceanography, Xianmen Unitersity, Xiamen 361005, China;Institute of Subtropic Oceanography, Xiamen University, Xiamen 361005, China;Key Laboratory of Marine Environmental Science of the Ministry of Education, Xiamen University, Xiamen 361005, China
2.
Department of Oceanography, Xianmen Unitersity, Xiamen 361005, China;Institute of Subtropic Oceanography, Xiamen University, Xiamen 361005, China

Received Date: 2002-12-25
Rev Recd Date: 2003-04-22

Abstract

Abstract

The effects of changes in concentrations of potassium,magnesium and calcium on settlement and metamorphosis in the Styela canopus Savigny larvae in artifical seaw ater and the characteristic of the potassium channels in externally accessible,excitable cell mem brane were studied.K⁺ effectively induced larval settlement and metamorphosis during the concentrations of 20~40 mmol/dm³,but showed inhibitive effect in the concentrations being less than or egual to 4.5 mmol/dm³ or being greater than or egual to 80 mmol/dm³.The inductive effect of 0~32 mmol/dm³ Mg²⁺ was remarkable,but 88 mmol/dm³ Mg²⁺ inhibited larval settlement and metamorphosis.The settlement and metamorphosis of the larvae would be inhibited no matter whether increased or decreased Ca²⁺ in artificial seawater.The failure of inhibiting the inductive effect of K⁺ by a K⁺ -channel blocker TEA (tetraethylamm onium chloride) indicated that the potassium channe ls in externally accessible,excitable cellmem brane of Styela canopus Savigny larvae are insensitive to external TEA.Like 80 mmol/dm³ K⁺,K⁺ -free or Mg²⁺-free sea waterw ould produce evidence of toxicity.The mechanisms of ionic control of settlement andmetamorphosis in the Styela canopus Savigny larvae were discussed.
- Styela canopus Savigny,
- larvae,
- settlement,
- metamorphosis,
- ionic control,
- ascidian

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References(35)

References

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