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Ecological and genetic study on Lethentron japonicum of which biomass is remarkably dicreasing

生物量显着减少的日本草的生态与遗传研究

基本信息

批准号：
20580191
负责人：
GOTOU Akira
金额：
$ 3.08万
依托单位：
Hokkaido University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2008
资助国家：
日本
起止时间：
2008 至 2010
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-20580191/
关键词：
カワヤツメ遡河回遊性生活史資源量減少ハビタット利用産卵場選択遺伝的多様性環境保全型資源管理施策寄生・回遊性生活史アンモシーテス幼生河川内ハビタット餌資源利用集団内遺伝的変異性遺伝子流動河川内ハビタット利用

项目摘要

To elucidate the cause and effect of highly decreased population size of the Arctic lamprey, Lethenteron japonicum in the stream life period, the ecological field research for larvae and upstream migrating adults, and population genetic analysis of the Ishikari River populations were carried out. As a result, it was made clear that both the soft mud quantity on the stream bed and the abundance of detritus originated from the litter of fallen leaves played an important role for high survival of lamprey larvae. In addition, it was found that the water depth was important for spawning success of upstream migrating lamprey adults. The results from microsatellite DNA analysis showed the genetic diversity of Ishikari River populations decreased in recent years. On the basis of these results, we proposed some improvement plans of stream environments to restore the population size of this lamprey species.

为阐明北极七鳃鳗（Lethenteronjaponicum）在溪流生活期种群数量急剧减少的原因和影响，对石狩川种群的幼虫和上游洄游成虫进行了生态学野外调查和种群遗传学分析。结果表明，河床上的软泥量和落叶层碎屑的丰富程度对七鳃鳗幼体的高存活率起着重要作用。此外，研究发现，水深是重要的产卵成功的上游迁移七鳃鳗成人。微卫星DNA分析结果表明，石狩川群体的遗传多样性近年来有所下降。在此基础上，我们提出了一些改善溪流环境的方案，以恢复七鳃鳗的种群规模。