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A study on factors affecting the decreases in abalone resources by comparing strategies in reproduction among different species

不同品种繁殖策略比较影响鲍鱼资源减少的因素研究

基本信息

批准号：
16380126
负责人：
KAWAMURA Tomohiko
金额：
$ 10.26万
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：
2004
资助国家：
日本
起止时间：
2004 至 2007
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-16380126/
关键词：
abalone reproductive stratery reproductive ecolory early life ecolory factors affecting resource decrease

项目摘要

The reproductive biology and early life ecology of abalone species (Haliotis discus discus, H. gigantea and H. diversicolor), which inhabit the southern area in Japan, were investigated by field observations and laboratory experiments in this study. Differences in reproductive strategy among abalone species including the northern species H. discus hannai, were examined. Maturation processes of adults, cues for their synchronized spawning, larval dispersion and transport to the settlement places, factors affecting larval settlement, post-larval survival and growth, were especially intensively studied and compared among species and habitats.Relatively high seawater temperature in winter since 1990's is suggested as the main factor increasing natural recruitment of H. discus hannai. However, young-of-the-year juveniles encountered the low winter seawater temperatures when they grew up to 3-7 mm SL several months after they were born. The annual recruitment level appears to be influenced also by earlier post-larval occurrence and mortality, which are strongly affected by the adult density. Dense patches of males and females appear to be important for fertilization success and post-larval survival in abalone species. For H. discus hannai, relatively high adult densities guaranteed larval occurrence and subsequent post-larval survival. On the other hand, adult densities are generally much lower in southern large species than in H. discus hannai and H. diversicolor, which is considered to be the major factor causing their low recruitments. The environmental deteriorations for larval settlement and post-larval survival were also suggested to be important factors affecting low natural recruitments of the southern abalone species. Laboratory experiments suggested that the small abalone H diversicolor has greater fertilization success than larger species due to differences in spawning behavior and gamete ability to fertilize.

本文对皱纹盘鲍（Haliotis discus discus，H.和H.通过野外观察和室内实验，研究了日本南部地区的一种常见的黑颈长尾雉（diversicolor）的形态特征。研究了包括北方鲍（H.皱纹盘鱼。本文重点研究了不同种类和不同生境下的成虫的成熟过程、同步产卵的原因、幼虫的扩散和向定居地的运输、影响幼虫定居、后期存活和生长的因素等，并提出了90年代以来冬季较高的海水温度是增加该虫自然补充量的主要因素。汉内铁饼。然而，当它们出生后几个月长到3-7 mm SL时，一年中最大的幼鱼遇到了冬季海水温度低的问题。每年的招聘水平似乎也受到影响较早后幼虫的发生和死亡率，这是强烈的成人密度的影响。密集的补丁的男性和女性似乎是重要的受精成功和后幼虫的生存在鲍鱼物种。螺杆相对较高的成虫密度保证了幼虫的发生和随后的幼虫后存活。另一方面，南方大型种的成虫密度通常比H低得多。discus hannai和H.这被认为是造成其招募率低的主要因素。研究还表明，环境的恶化是影响南方鲍自然补充率低的重要因素。实验表明，由于产卵行为和配子受精能力的差异，小型杂色鲍的受精成功率高于大型鲍。