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首页> 外文期刊>Geochemistry: Exploration, Environment, Analysis >Variations in otolith elemental compositions of two clupeid species, Stolothrissa tanganicae and Limnothrissa miodon in Lake Tanganyika
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Variations in otolith elemental compositions of two clupeid species, Stolothrissa tanganicae and Limnothrissa miodon in Lake Tanganyika

机译：坦any尼喀湖中两个类丘比特物种唐古特氏菌（Stolothrissa tanganicae）和Li草（Limnothrissa miodon）耳石的元素组成变化

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摘要

Lake Tanganyika in East Africa has two primary basins (Northern and Southern) and borders four sovereign countries. Effective management of the fisheries of this lake requires sound biological understanding of the various fish stocks. The feasibility of fish stock identification within different basins and sub-basins of this lake was attempted through otolith elemental composition analysis. Element ratio signatures of whole sagittal otoliths (Mg/Ca, Sr/Ca and Ba/Ca) of two commercially important clupeid species (Stolothrissa tanganicae, n=18; Limnothrissa miodon, n=32) were used to classify individual fish to their resident basins. No element ratios in L. miodon otoliths were significantly different between Southern sub-basins, yet Ba/Ca and Sr/Ca ratios were significantly different for individuals from the Northern and Southern basins. Sr/Ca and Ba/Ca ratios were also significantly different between otoliths of sympatric L. miodon and S. tanganicae in the Northern Bujumbura Sub-basin. Species differences may be due to ontogenetic and environmental variables. Sr/Ca and Ba/Ca element concentration ratios contributed greatly to basin classification of individual fish. Canonical discriminant analysis correctly classified 91% of L. miodon and 83.3% of S. tanganicae to the Bujumbura sub-basin, compared to 59.9% of L. miodon collected from the Southern Basin that were correctly classified to this basin. These classification rates are similar to those found for estuarine species. Our results of a limited study suggest that otolith element compositions can be used as a natural tag to identify fish stocks in Lake Tanganyika and assist in the implementation of a multi-national fisheries best management plan.
机译：东非的坦any尼喀湖有两个主要盆地（北部和南部），与四个主权国家接壤。有效 管理该湖的渔业需要对各种鱼类种群有良好的生物学 了解。通过耳石成分分析 ，尝试在该湖不同流域和子流域 中识别鱼类种群的可行性。两种商业上重要的clupeid 物种（Stolothrissa tanganicae，n = 18； Limnothrissa miodon）的整个矢状耳石 （Mg / Ca，Sr / Ca和Ba / Ca）的元素比特征， n = 32）将单个鱼分类为其常驻的 盆地。南部亚盆地之间的L. miodon耳石中元素比例没有显着 ，但Ba / Ca和Sr / Ca比 与北部 和南部盆地。在北部布琼布拉次盆地，同胞L. miodon和S. tanganicae 的耳石之间的Sr / Ca和Ba / Ca比值也存在显着差异。物种差异可能 是由于个体发育和环境变量所致。 Sr / Ca和 Ba / Ca元素浓度比对单个鱼的流域 分类有很大贡献。典范判别分析 正确地将91％的L. miodon和83.3％的S. tanganicae 归入布琼布拉次盆地，而收集到的59.9％的L. miodon > （来自南部盆地）已正确分类为该 盆地。这些分类率与对河口物种 发现的分类率相似。我们的有限研究结果表明， 耳石元素成分可以用作天然标签 来识别坦any尼喀湖的鱼类种群并协助 实施跨国渔业最佳管理 计划。

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  • 来源
    《Geochemistry: Exploration, Environment, Analysis》 |2005年第1期|00000091-00000097|共7页
  • 作者

    Aboubakar Sako; Catherine M. OReilly; Robyn Hannigan; Nate Bickford; Ronald L. Johnson;

  • 作者单位

    Environmental Sciences, Arkansas State University, PO Box 847, State University, AR 72467, USA (e-mail: asako@astate.edu);

    Environmental Science Program, Department of Biology, Vassar College, Poughkeepsie, NY 12604, USA;

    Environmental Sciences, Arkansas State University, PO Box 847, State University, AR 72467, USA (e-mail: asako@astate.edu);

    Environmental Sciences, Arkansas State University, PO Box 847, State University, AR 72467, USA (e-mail: asako@astate.edu);

    Environmental Sciences, Arkansas State University, PO Box 847, State University, AR 72467, USA (e-mail: asako@astate.edu);

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  • 关键词

    otolith elemental compositions; Lake Tanganyika; clupeids;

    机译：耳石元素组成;坦any尼喀湖;笨蛋;

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