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首页> 外文学位 >Integrating genetics and ecology towards the conservation of the bullhead (Cottus gobio) and the stone loach (Barbatula barbatula), two native freshwater fish species.
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Integrating genetics and ecology towards the conservation of the bullhead (Cottus gobio) and the stone loach (Barbatula barbatula), two native freshwater fish species.

机译：整合遗传学和生态学，以保护两种本地淡水鱼种-bull鱼（Cottus gobio）和泥lo（Barbatula barbatula）。

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摘要

To date, information on the level or distribution of genetic diversity within fish species inhabiting anthropogenically disturbed Flemish rivers is virtually absent. In addition, knowledge of habitat improvement techniques, the barrier-effect of human structures and/or the effectiveness of fish pass facilities is also lacking for many native species, especially those with no economical or recreational importance. Information concerning the above topics is however of vital importance to develop sound species-specific conservation programmes. The objective of this thesis was to contribute to the elimination of this lacuna for the bullhead (Cottus gobio) and the stone loach (Barbatula barbatula), two small bottom-dwelling freshwater fish species that have suffered a (considerable) decline during the twentieth century in Flanders and other parts of Europe.; Despite extensive human activities during the twentieth century, high levels of genetic diversity at microsatellite loci were detected in the investigated Flemish stone loach populations (HE: 0.67--0.85; MNA: 6.2--11.2). Conversely, analysis of microsatellite loci indicated that levels of genetic diversity in Flemish bullhead populations often were (extremely) pauperised (HE: 0.01--0.68; MNA: 1.1--6.0). In addition, there were indications that bullhead populations that have been depleted of genetic diversity were also suffering a decreased fitness. It is highly unlikely that the major degradation of the Flemish watercourses during the twentieth century did not significantly contribute to the observed genetic decay in the examined bullhead populations. After all, the species is not only considered to be very sensitive to water pollution but also to river engineering practices.; The current size of bullhead populations appears to be very important for the maintenance of genetic variation within a local population. Consequently, to minimise or even reverse further genetic erosion, an immediate priority for conservation should be to increase the size and range of the remaining bullhead populations. Essential requirements to achieve this are improvement of the habitat quality and reduction of the river fragmentation.; Vital habitat components for the survival of the bullhead are stones or other hard substrates (they are used as spawning and shelter sites). (Abstract shortened by UMI.)
机译：迄今为止，关于人为干扰弗拉芒河的鱼类物种中遗传多样性的水平或分布的信息几乎不存在。另外，许多本地物种，尤其是那些不具有经济或娱乐重要性的物种，也缺乏对生境改善技术，人体结构的屏障效应和/或鱼道设施的有效性的知识。但是，有关上述主题的信息对于制定合理的物种特定保护计划至关重要。本论文的目的是为消除这种head头（Cottus gobio）和石lo（Barbatula barbatula），这两种小底栖淡水鱼类在二十世纪遭受（显着）下降做出贡献。在法兰德斯和欧洲其他地区。尽管在20世纪人类开展了广泛的活动，但在被调查的佛兰德石lo种群中，微卫星基因座的遗传多样性水平很高（HE：0.67--0.85; MNA：6.2--11.2）。相反，对微卫星基因座的分析表明，佛兰芒人的头顶种群的遗传多样性水平经常（极度）恶化（HE：0.01--0.68； MNA：1.1--6.0）。此外，有迹象表明，已经丧失了遗传多样性的bull鱼种群的适应性也有所下降。弗拉芒河道在二十世纪的主要退化极不可能对所检查的牛头种群中观察到的遗传衰变没有明显贡献。毕竟，该物种不仅被认为对水污染非常敏感，而且对河流工程实践也非常敏感。 bull头种群的当前规模对于维持本地种群内的遗传变异似乎非常重要。因此，为使进一步的遗传侵蚀减至最小甚至逆转，保存的当务之急应该是增加剩余牛头种群的规模和范围。实现这一目标的基本要求是改善栖息地质量和减少河流支离破碎。 the头生存的重要栖息地成分是石头或其他坚硬的底物（它们被用作产卵和庇护所）。 （摘要由UMI缩短。）

著录项

  • 作者

    Knaepkens, Guy.;

  • 作者单位

    Universiteit Antwerpen (Belgium).;

  • 授予单位 Universiteit Antwerpen (Belgium).;
  • 学科 Biology Ecology.; Biology Genetics.; Agriculture Fisheries and Aquaculture.
  • 学位 Ph.D.
  • 年度 2004
  • 页码 158 p.
  • 总页数 158
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 生态学（生物生态学）;遗传学;水产、渔业;
  • 关键词

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