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首页> 外文期刊>Environmental toxicology and chemistry >GENETIC COSTS OF TOLERANCE TO METALS IN DAPHNIA LONGISPINA POPULATIONS HISTORICALLY EXPOSED TO A COPPER MINE DRAINAGE
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GENETIC COSTS OF TOLERANCE TO METALS IN DAPHNIA LONGISPINA POPULATIONS HISTORICALLY EXPOSED TO A COPPER MINE DRAINAGE

机译：历史上暴露于铜矿流失的达菲尼亚龙虾种群金属耐受性的遗传成本

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摘要

The present study was conducted to assess three microevolutionary aspects of adaptation to pollution in Daphnia longispina populations historically exposed to an acid mine drainage from an abandoned pyrite mine: pollution mediated effects in acute tolerance to copper (Cu) and zinc (Zn); pollution-mediated effects on genetic variability of tolerant and physiological traits related to fitness (feeding rates); and fitness costs of tolerance measured as genetic trade-offs between tolerance and feeding rates under none and low levels of contamination. These objectives were addressed by comparing broad sense heritabilities and genetic correlations using up to 20 distinct clonal lineages randomly obtained from two populations: one located in a water reservoir contaminated by the acid mine drainage, and the other located in a nearby clean water reservoir. Results showed that only sensitive and resistant lineages to Cu were present in the reference and contaminated site, respectively. For Zn, however, both populations had a similar distribution pattern of sensitivities. Heritability values for tolerant and feeding traits across metal exposure levels was similar in both populations being in most cases greater than 50%. Fitness costs of tolerance were illustrated by lower feeding rates of the tolerant population compared to the reference one and negative genetic correlations between mean clonal feeding rates and median clonal survival time in control conditions (no added Cu or Zn). The results obtained thus support the view that tolerance to pollution is ecologically costly.
机译：进行本研究是为了评估在长期暴露于废弃黄铁矿的酸性矿山排水中的水蚤（Daphnia longispina）种群适应污染的三个微进化方面：污染介导的对铜（Cu）和锌（Zn）的急性耐受性效应；污染对与适应性有关的耐受性和生理性状遗传变异的影响（摄食率）；耐受性的适应性成本，是在无污染和低污染水平下，通过耐受性与进食速度之间的遗传权衡来衡量的。通过使用从两个种群中随机获得的多达20种不同的克隆谱系比较广义遗传力和遗传相关性，解决了这些目标：一个种群位于被酸性矿井排水污染的水库中，另一个位于附近的净水库中。结果表明，在参考位点和受污染的位点仅分别存在对Cu敏感和耐药的谱系。然而，对于锌，两个种群的敏感性分布模式相似。在两个人群中，金属暴露水平下的耐受性和摄食性状的遗传力值相似，在大多数情况下均大于50％。耐受性的适应性成本通过与参考人群相比较低的耐受种群进食速度以及对照条件下（无添加铜或锌）的平均克隆进食速度与中位克隆存活时间之间的负遗传相关性来说明。因此，获得的结果支持了这样一种观点，即对污染的容忍在生态上是昂贵的。

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  • 来源
    《Environmental toxicology and chemistry》 |2010年第4期|p.939-946|共8页
  • 作者

    Ana Raquel Agra; Lucia Guilhermino; Amadeu M.V.M. Soares; Carlos Barata;

  • 作者单位

    CESAM-Centra de Estudos do Ambiente e Mar and Departamento de Biologia, Universidade de Aveiro, Campus de Santiago, 3810-193 Aveiro, Portugal;

    ICBAS-Instituto de Ciencias Biomedicas de Abel Salazar, Departamento de Estudos de Populacpes, Universidade do Porto,Lg. Prof. Abel Salazar, 2, 4099-003 Porto, Portugal CIIMAR/CIMAR-LA-Centra Interdisciplinar de Investigacao Marinha e Ambiental, Universidade do Porto, Rua dos Bragas,177, 4050-123 Porto, Portugal;

    CESAM-Centra de Estudos do Ambiente e Mar and Departamento de Biologia, Universidade de Aveiro, Campus de Santiago, 3810-193 Aveiro, Portugal;

    Department of Environmental Chemistry, IDAEA-CSIC, Jordi Girona 18, 08034 Barcelona, Spain;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    daphnia longispina; metals; tolerance; fitness costs; adaptation;

    机译：水蚤金属;公差;健身费用;适应;

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