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首页> 外文期刊>Marine ecology progress series >Reconstructing lifetime nitrogen baselines and trophic position of Cynoscion acoupa from δ~(15)N values of amino acids in otoliths
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Reconstructing lifetime nitrogen baselines and trophic position of Cynoscion acoupa from δ~(15)N values of amino acids in otoliths

机译：从耳石中氨基酸的δ〜（15）N值重建人参的终生氮基线和营养位置

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摘要

Habitat connectivity and trophic shifts during the lifetime of an individual fish are important determinants of fish population growth and persistence, yet remain little understood for many species. We investigated whether insights into individual lifetime migration, trophic position (TP) and environ mental nitrogen dynamics could be achieved using compound-specific nitrogen isotope analysis of oto lith proteinogenic amino acids (AAs). By comparing acoupa weakfish Cynoscion acoupa otoliths and muscle tissue from the monsoonal Amazon area in Para with otoliths from semi-arid Rio Grande do Norte (RGN), Brazil, this study illustrates estuarine to coastal shelf habitat use and trophic ecology during juvenile and adult stage growth. Muscle tissue and otoliths gave comparable TPs for both life stages, while weighted mean delta N-15 values of all source AAs differed between tissues. These differences reflected large seasonal and spatial changes in nitrogen biogeochemical cycles and anthropogenic nitrogen influences from the Amazon River onto the coastal shelf of Para. AA delta N-15 values of fish otoliths from the Para region indicated changes in TP and sources of nitrogen between life stages, whereas analysis of fish otoliths from the RGN region indicated similarities in individual TP and sources of nitrogen through ontogeny. However, in both areas, individual adult TP ranged between 3 and 4, whereas juvenile TP remained around 2.8 to 3.0 in Para and RGN, respectively. Since otoliths preserve a record of baseline delta N-15 values over the lifetime of individual fish it may be possible to infer migration and TP across pre historic ecosystems from AA isotopic analysis of an cient otoliths.
机译：单个鱼类一生中的栖息地连通性和营养变化是决定鱼类种群增长和持久性的重要因素，但许多物种对此知之甚少。我们调查了是否可以使用oto lith蛋白原氨基酸（AAs）的化合物特异性氮同位素分析来获得对个体终生迁移，营养位置（TP）和环境氮动力学的见解。通过比较帕拉季风亚马逊地区的阿科帕弱鱼Cynoscion acoupa耳石和肌肉组织与巴西半干旱北里约格兰德州（RGN）的耳石，该研究说明了幼年和成年期河口到沿海大陆架栖息地的利用和营养生态增长。肌肉组织和耳石在两个生命阶段都具有可比的TP，而所有源AA的加权平均增量N-15值在组织之间有所不同。这些差异反映了氮生物地球化学循环的巨大季节性和空间变化，以及从亚马逊河到帕拉沿海地带的人为氮影响。来自帕拉地区的鱼耳石的AA delta N-15值表明生命阶段之间TP和氮源的变化，而来自RGN地区的鱼耳石的分析表明个体TP和通过个体发育的氮源的相似性。然而，在这两个地区，成人的TP值在3到4之间，而Para和RGN的青少年TP值分别保持在2.8到3.0左右。由于耳石在单个鱼类的生存期内保存了基线δN-15值的记录，因此有可能通过对古代耳石的AA同位素分析推断出历史前生态系统中的迁移和总磷。

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