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Interpreting nitrogen stable isotopes in the study of migratory fishes in marine ecosystems

机译：解释氮稳定同位素在海洋生态系统中迁徙鱼类的研究中

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Stable isotopes have proven effective in the ecological study of terrestrial, freshwater, marine and estuarine systems. However, their utility in the study of large migratory fishes in the dynamic ocean may be more difficult to ascertain. Migration across large areas of ocean in short periods of time may result in a large amount of variability in the nitrogen ratios of large pelagic fishes. High variability was found in nitrogen ratios (delta N-15) used to quantify trophic positions of large pelagic fish species and their prey in the southern Gulf of California. Mean delta N-15 values for eleven large pelagic predators ranged from 14.8 aEuro degrees for blue marlin to 18.7 aEuro degrees for amberjack. Predators typically present in the Gulf during winter months had a higher mean value (18.5 +/- A 0.7 aEuro degrees) than summer predators (15.8 +/- A 1.5 aEuro degrees). Common prey items, including cephalopods, fish and crustaceans, had mean delta N-15 values ranging from 12.2 to 19.1 aEuro degrees (epipelagic fishes = 17.5 +/- A 0.7 aEuro degrees, cephalopods = 15.6 +/- A 0.9 aEuro degrees, inshore fishes = 14.2 +/- A 1.6 aEuro degrees, crustaceans = 12.2 +/- A 0.4 aEuro degrees), in many cases exceeding their predators by more than one full trophic level. We analyzed potential sources of this variability by examining diets, oceanographic conditions and fish migration. Diet shifts with size do not account for the variability, but the likely source appears to be slow turnover rate of body tissues of migratory pelagic fish as they traverse both highly productive and oligotrophic water masses in the eastern Pacific Ocean. From this study, we advise caution when interpreting results of stable isotope ratios in migratory pelagic fishes, and suggest designing studies that account for sources of variability.
机译：稳定同位素已被证明在陆地，淡水，海洋和河口系统的生态研究中有效。但是，它们在动态海洋中大型large游鱼类研究中的用途可能更难确定。在短时间内跨大面积海洋的迁移可能导致大型远洋鱼类的氮比率发生大量变化。在氮比（δN-15）中发现了高度变异性，氮比用于量化大型中上层鱼类及其在加利福尼亚湾南部的猎物的营养位置。 11个大型远洋捕食者的平均N-15值范围从蓝色马林鱼的14.8 aEuro度到Euro鱼的18.7 aEuro度。通常在冬季，海湾地区存在的捕食者的平均值（18.5 +/- A 0.7 aEuro度）要高于夏天的捕食者（15.8 +/- A 1.5 aEuro度）。包括头足类，鱼类和甲壳类在内的常见猎物在海岸上的平均N-15增量值在12.2至19.1 aEuro度之间（e鱼= 17.5 +/- A 0.7 aEuro度，头足类动物= 15.6 +/- A 0.9 aEuro度，近岸鱼类= 14.2 +/- A 1.6 aEuro度，甲壳类动物= 12.2 +/- A 0.4 aEuro度），在许多情况下，它们比它们的捕食者多一个完整的营养水平。我们通过检查饮食，海洋条件和鱼类迁移来分析了这种可变性的潜在来源。饮食随大小的变化并不能说明其可变性，但可能的原因似乎是迁徙的中上层鱼类的身体组织的周转速度较慢，因为它们穿越东太平洋的高产水域和贫营养水域。从这项研究中，我们建议在解释迁徙中上层鱼类的稳定同位素比率结果时要谨慎，并建议设计考虑变异性来源的研究。

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  • 来源
    《Marine biology》 |2015年第5期|1099-1110|共12页
  • 作者

    Richert John E.; Galvan-Magana Felipe; Klimley A. Peter;

  • 作者单位

    Univ Calif Davis, Davis, CA 95616 USA;

    Inst Plitecn Nacl CICIMAR, Ctr Interdisciplinario Ciencias Marinas, La Paz, Mexico;

    Univ Calif Davis, Davis, CA 95616 USA;

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