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首页> 外文期刊>Zoological Science >Low genetic variation and inbreeding depression in small isolated populations of the Japanese rosy bitterling, Rhodeus ocellatus kurumeus
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Low genetic variation and inbreeding depression in small isolated populations of the Japanese rosy bitterling, Rhodeus ocellatus kurumeus

机译：在日本玫瑰色苦味小球菌Rhodeus ocellatus kurumeus的少量孤立种群中低遗传变异和近交抑制

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摘要

The Japanese rosy bitterling, Rhodeus ocellatus kurumeus, has been affected not only by the invasion of another subspecies, R. o. ocellatus, from China, but also by habitat fragmentation. In this study, the effects of habitat fragmentation on the fitness of R. o. kurumeus were investigated. Owing to exclusion by R. o. ocellatus, R. o. kurumeus in Honshu and Shikoku has disappeared entirely, except for small populations in isolated man-made ponds in Osaka and Kagawa. In Kyushu it still occupies open water systems, into which R. o. ocellatus has only recently invaded. Meristic and genetic data show that the diversity of R. o. kurumeus is significantly lower in the isolated Osaka and Kagawa populations than the non-isolated Fukuoka population. The Osaka population is inferior to the Fukuoka population in terms of viability and growth. The viability of reciprocal inter-population hybrids between the Osaka and Fukuoka populations was, however, as high as that of the Fukuoka population. In addition to the high scores of band sharing index (BSI) in RAPD-PCR analysis, acceptance of transplanted scales among individuals, irrespective of natal pond, indicates that the Osaka population forms a highly inbred line. These results suggest that low genetic variation is associated with inbreeding depression in the small isolated Osaka populations. Consequently, the management of ponds, including the free movement of individuals, in addition to measures to prevent the invasion of R. o. ocellatus, is necessary for the conservation of R. o. kurumeus.
机译：日本玫瑰色的苦味鱼，Rhodeus ocellatus kurumeus，不仅受到了另一个亚种R. o。的入侵的影响。来自中国的小球藻，也受到栖息地破碎化的影响。在这项研究中，生境破碎化对罗氏沼虾适应性的影响。对库鲁梅斯进行了调查。由于被R. o。排除在外。 ocellatus，河本州和四国的kurumeus完全消失了，除了大阪和香川县孤立的人工池塘中的小种群。在九州，它仍然占据着开放水系统，R。o。 ocellatus只是最近才入侵。 Meristic和遗传数据表明，R。o。的多样性。在孤立的大阪和香川县人口中，kurumeus明显低于未孤立的福冈人口。就生存能力和增长而言，大阪人口不如福冈人口。然而，大阪和福冈人口之间的相互种群间杂交的生存力与福冈人口的一样高。除了在RAPD-PCR分析中获得高的谱带共享指数（BSI）之外，无论出生池塘如何，个体之间接受移植标度的接受都表明大阪人口构成了高度自交系。这些结果表明，低遗传变异与较小的孤立大阪种群中的近交衰退有关。因此，除了防止入侵罗非鱼的措施外，还对池塘进行管理，包括个人的自由流动。 ocellatus，对于保护R. o。必不可少。 kurumeus。

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