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A study on early life ecology of abalone species and factors affecting their mortalities in southern Japan

日本南部鲍鱼早期生命生态学及其死亡率影响因素研究

基本信息

批准号：
13460083
负责人：
KAWAMURA Tomohiko
金额：
$ 7.87万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2003
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-13460083/
关键词：
abalone early life ecology reproductive ecology factors affecting mortality recruitment 滅耗要因

项目摘要

The reproductive biology and early life ecology of abalone, Haliotis discus discus, H. madaca, H. gigantea and H. diversicolor, which inhabit in southern area in Japan, were investigated by field observations and laboratory experiments in this study. The factors affecting recruitment of the northern species Haliotis discus hannai, which has more information on its reproduction and ecology in the early life stages than the southern abalone species, were analyzed and discussed.Epidemic spawning of the small abalone Haliotis diversicolor appeared to be synchronously with typhoon events. The larval settlement and initial survival of post-larvae could be strongly influenced by sediment on the settlement substrata and wave disturbance. The dietary conditions and water temperature in their habitats could affect the survival and growth rates of juveniles. The radula development in H. diversicolor was different from that in H. discus hannai, suggesting the main diets and thus habitat of H. diversicolor are different from those of big abalone species.Larvae and post-larvae of big southern abalone species, H. discus discus, H. madaca, H. gigantea, appeared from October to January. However, any associated spawning cues were not detected. Densities of the post-larvae of these big species were much lower than that of H diversicolor. Successful reproduction of the big abalone species may be inhibited due to the low density of their spawning populations.As present major factors affecting recruitment of H. discus hannai, seawater temperature during winter, density of spawning adults, and dietary conditions for post-larvae were suggested.

本文对皱纹盘鲍（Haliotis discus discus）的生殖生物学和早期生活生态学进行了研究。madaca、黑腹蛛H.和H.本研究通过野外观察和室内实验，对日本南部地区的变色龙进行了研究。对北方皱纹盘鲍（Haliotis discus hannai）的补充影响因素进行了分析和讨论，皱纹盘鲍（Haliotis discus hannai）的繁殖和早期生态信息比南方鲍多，杂色鲍（Haliotis diversicolor）的产卵与台风事件具有同步性。沉积基质上的沉积物和波浪扰动对仔稚鱼的沉积和初期存活有很大影响。饵料条件和栖息地水温会影响幼鱼的存活率和生长率。H. diversicolor与H. discus hannai，提示了该虫的主要食性和栖息地。杂色鲍与大鲍的幼体和仔稚鱼的形态特征不同，南方大鲍、杂色鲍、杂色鲍和大鲍的幼体和仔稚鱼的形态特征不同。discus discus，H. madaca、黑腹蛛H.茶，出现在10月至1月。然而，没有检测到任何相关的产卵线索。这些大种的后幼虫密度远低于杂色瓢虫。大鲍的产卵种群密度低，可能会抑制大鲍的成功繁殖。对皱纹盘鱼的产卵期、越冬期水温、产卵密度和仔稚鱼的饵料条件提出了建议。