冠瘤海鞘同种群聚的化学诱因初步研究

Preliminary study on chemical cues in the conspecific aggregation of Styela canopus

研究了不同浓度的冠瘤海鞘成体被囊萃取物和幼体萃取物及不同的幼体密度对冠瘤海鞘(Styelacanopus)幼体附着和变态的影响.结果表明,冠瘤海鞘被囊萃取物和幼体萃取物在5%和10%的浓度下均促进冠瘤海鞘幼体的附着和变态,但被囊萃取物的诱导效果明显强于幼体萃取物;幼体密度高于25只/cm3时,促进冠瘤海鞘幼体的附着和变态;幼体密度低于10只/cm3时,幼体的附着和变态不受密度影响.这些结果提示海区中冠瘤海鞘的同种群聚可能与其被囊或幼体内含诱导幼体附着和变态的化学因子有关.

The effects of conspecific adult tunic extracts and larval tissue extracts in different concentrations and the effects of different larval density on settlement and metamorphosis in the Styela canopus larvae were investigated.Experiments show that conspecific adult tunic extracts and larval tissue extracts both were able to induce Styela canopus larvae to settle and metamorphose in the concentrations of 5% and 10%.It is found that Styela canopus larvae are induced to settle and metamorphose at densities of more than 25 larvae per millilitre and the settlement and metamorphosis are not influenced at densities of lower than 10 larvae per millilitre.All results suggest that the ability of chemical factors in adult tunic extracts or larval tissue extracts to induce settlement and metamorphosis may explain the conspecific aggregation of Styela canopus in nature.