Chemical induction of settlement and metamorphosis in two Babylonia (Gastropoda) larvae |
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Authors: | Ke Caihuan Li Shaojing Li Fuxue Zheng Zhon Liu Weibin |
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Affiliation: | 1.Department of Oceanography and Institute of Subtropical Oceanography, Xiamen University, Xiamen 361005, China2.Fujian Fisheries Research Institute, Xiamen 361012, China |
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Abstract: | By exposure to 12×10-3 mol/dm3 K+ for 24 h, more than 90% of planktonic larvae of Babylonia formosae and B.areolata were effectively induced to metamorphose completely.15×10-3mol/dm3 K+ exerted toxic effect on larval B.areolata over a 24 h period, but produced better results of induction by 12 h exposure.Metamorphosed juveniles induced by increased by K+ could move and feed normally.Percent metamorphosis increased with average shell height for K+-induced larvae.L-DOPA, epinephrine and norepinephrine ranging from 5.5×10-6 to 5.5×10-5 mol/dm3 had no inductive activity to metamorphosis in larval B.areolata,whereas the rate of metamorphosis induced by dopamine at a concentration of 10-4 mol/dm3 was approximately half less than that by 12×10-3 mol/dm3 K+.TEA (a K+-channel blocker) did not inhibit metamorphosis in the two Babylonia larvae by induction of K+.Based on the results of K+-induced experiments, it is preliminarily suggested that shell height of larvae achieving metamorphic competence was in the range of 860.2-1 009.8 pm for B.frmosae,and 849.6-956.0 pm for B.areolata.In addition, planktonic larvae of the two Babylonia had delayed metamorphosis. |
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Keywords: | Chemical induction metamorphosis Babylonia formosae B. areolata larva |
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