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Speciation leads to divergent methylmercury accumulation in sympatric whitefish

机译：形态导致同伴白鱼中甲基汞的积累不同

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摘要

Central European lake whitefish (Coregonus spp.) colonized Swiss lakes following the last glacial retreat and have undergone rapid speciation and adaptive radiation. Up to six species have been shown to coexist in some lakes, and individual species occupy specific ecological niches and have distinct feeding and reproductive ecologies. We studied methylmercury (MeHg) accumulation in sympatric whitefish species from seven Swiss lakes to determine if ecological divergence has led to different rates of MeHg bioaccumula-tion. In four of seven lakes, sympatric species had distinctly different MeHg levels, which varied by up to a factor of two between species. Generally, species with greater MeHg levels were smaller in body size and planktivorous, and species with lower MeHg were larger and benthivorous. While modest disparities in trophic position between species might be expected a priori to explain the divergence in MeHg,δI5N of bulk tissue did not correlate with fish MeHg in five of seven lakes. Results of a nested ANCOVA analysis across all lakes indicated that only two factors (species, lake) explained substantial portions of the variance, with species accounting for more variance (52 %) than inter-lake differences (32 %). We suggest that differences in MeHg accumulation were likely caused by diverging metabolic traits between species, such as differences in energy partitioning between anabolism and catabolism, potentially interacting with species-specific prey resource utilization. These results indicate substantial variability in MeHg accumulation between closely related fish species, illustrating that ecological speciation in fish can lead to divergent MeHg accumulation patterns.
机译：在最后一次冰川退缩之后，中欧湖泊白鲑（Coregonus spp。）殖民了瑞士湖泊，并经历了快速的物种形成和适应性辐射。在某些湖泊中，已经显示出多达六个物种共存，并且个别物种占据特定的生态位，并具有独特的摄食和繁殖生态。我们研究了来自七个瑞士湖泊的同伴白鲑物种中甲基汞（MeHg）的积累，以确定生态差异是否导致了不同的MeHg生物累积速率。在七个湖泊中的四个中，同胞物种的MeHg水平明显不同，物种之间的差异高达两个因子。通常，具有较高MeHg水平的物种的体型较小且浮游动物，而具有较低MeHg的物种则较大且易弯曲。虽然可以事先推断出物种之间营养位置的适度差异来解释MeHg的差异，但是在七个湖中的五个中，大块组织的δI5N与鱼类的MeHg不相关。在所有湖泊中进行的嵌套ANCOVA分析结果表明，只有两个因素（物种，湖泊）解释了变异的大部分，其中物种比湖泊间差异（32％）占更多的差异（52％）。我们建议，MeHg积累的差异很可能是由于物种之间新陈代谢特征的差异所致，例如合成代谢和分解代谢之间能量分配的差异，并可能与特定物种的猎物资源利用相互作用。这些结果表明，在密切相关的鱼类之间，甲基汞的积累存在很大的差异，这说明鱼类的生态形态可能导致不同的甲基汞积累模式。

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  • 来源
    《Aquatic Sciences》 |2013年第2期|261-273|共13页
  • 作者

    Nanina Blank; Alan G. Hudson; Pascal Vonlanthen; Ole Seehausen; Chad R. Hammerschmidt; David B. Senn;

  • 作者单位

    Institute of Biogeochemistry and Pollutant Dynamics,ETH, 8092 Zurich, Switzerland,Institute of Biogeochemistry and Pollutant Dynamics,ETH, 8092 Zurich, Switzerland;

    Eawag, Swiss Federal Institute of Aquatic Science and Technology, 6047 Kastanienbaum, Switzerland,Institute of Ecology and Evolution, University of Bern,3012 Bern, Switzerland;

    Eawag, Swiss Federal Institute of Aquatic Science and Technology, 6047 Kastanienbaum, Switzerland,Institute of Ecology and Evolution, University of Bern,3012 Bern, Switzerland;

    Eawag, Swiss Federal Institute of Aquatic Science and Technology, 6047 Kastanienbaum, Switzerland,Institute of Ecology and Evolution, University of Bern,3012 Bern, Switzerland;

    Department of Earth and Environmental Sciences,Wright State University, Dayton, OH 45435, USA;

    Institute of Biogeochemistry and Pollutant Dynamics,ETH, 8092 Zurich, Switzerland,Eawag, Swiss Federal Institute of Aquatic Science and Technology, 6047 Kastanienbaum, Switzerland;

  • 收录信息 美国《科学引文索引》(SCI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    adaptive radiation; bioaccumulation; coregonus; methylmercury; speciation;

    机译：适应性辐射;生物蓄积gon甲基汞物种;

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