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Trophic position and dietary breadth of bats revealed by nitrogen isotopic composition of amino acids

机译：氨基酸的氮同位素组成揭示了蝙蝠的营养位置和饮食宽度

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Bats perform important ecosystem services, but it remains difficult to quantify their dietary strategies and trophic position (TP) in situ. We conducted measurements of nitrogen isotopes of individual amino acids (δ 15NAA) and bulk-tissue carbon (δ 13Cbulk) and nitrogen (δ 15Nbulk) isotopes for nine bat species from different feeding guilds (nectarivory, frugivory, sanguivory, piscivory, carnivory, and insectivory). Our objective was to assess the precision of δ 15NAA-based estimates of TP relative to other approaches. TPs calculated from δ 15N values of glutamic acid and phenylalanine, which range from 8.3–33.1‰ and 0.7–15.4‰ respectively, varied between 1.8 and 3.8 for individuals of each species and were generally within the ranges of those anticipated based on qualitative dietary information. The δ 15NAA approach reveals variation in TP within and among species that is not apparent from δ 15Nbulk data, and δ 15NAA data suggest that two insectivorous species (Lasiurus noctivagans and Lasiurus cinereus) are more omnivorous than previously thought. These results indicate that bats exhibit a trophic discrimination factor (TDF) similar to other terrestrial organisms and that δ 15NAA provides a reliable approach for addressing questions about variation in the TP of bats that have heretofore proven elusive.
机译：蝙蝠提供重要的生态系统服务，但仍然难以量化其饮食策略和原位营养位置。我们对来自不同饲养协会（食肉，食肉，食肉动物，食肉动物，食肉动物和食肉动物）的九种蝙蝠物种的单个氨基酸（δ15NAA），体组织碳（δ13Cbulk）和氮（δ15Nbulk）的氮同位素进行了测量。食虫）。我们的目标是相对于其他方法，评估基于δ15NAA的TP估计值的精度。根据谷氨酸和苯丙氨酸的δ15N值计算得出的总磷分别为8.3–33.1‰和0.7–15.4‰，每种物种的个体之间的总磷在1.8至3.8之间变化，并且通常在根据定性饮食信息预期的范围内。 δ15NAA方法揭示了物种内部和物种之间TP的变化，这在δ15Nbulk数据中并不明显，而δ15NAA数据表明，两个食虫物种（夜蛾和食蟹猴）比以前认为的杂食性更大。这些结果表明，蝙蝠表现出与其他陆地生物相似的营养区分因子（TDF），而δ15NAA提供了一种可靠的方法来解决迄今被证明难以捉摸的蝙蝠TP变异的问题。

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