Silversides (Odontesthes bonariensis) reside within freshwater and estuarine habitats, not marine environments
Silversides (Odontesthes bonariensis) reside within freshwater and estuarine habitats, not marine environments
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DOI：
10.1016/j.ecss.2018.03.014
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发表时间：
2018-05
影响因子：
2.8
通讯作者：
E. Avigliano;N. Miller;A. Volpedo
中科院分区：
文献类型：
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作者：
E. Avigliano;N. Miller;A. Volpedo
采用激光烧蚀电感耦合等离子体质谱（LA-ICP-MS）测定耳石核缘Sr：Ca比值，分析乌拉圭河（淡水）和Ríode拉普拉塔河口（河口水）（南美普拉塔盆地）银汉鱼（Odontesthesbonariensis）的盐度-栖息地迁移历史。Sr：Ca的有规律的核心到边缘振荡表明银汉鱼每年在淡水（<1 PSU）和半咸水（>1 PSU）栖息地之间迁徙，没有海洋入侵或非迁徙个体的证据。经验方程，代表电导率/盐度和耳石Sr：Ca比之间的关系，用于确定在一个耳石的个人之间的淡水和半咸水的栖息地过渡。在大多数标本中，栖息地之间的第一次迁移可能发生在生命的第一年内。对于年龄相当的鱼类，通过变化点分析确定的稳定Sr：Ca特征（具有不同盐度的地点）之间的平均变化数在乌拉圭河（8.9 ± 3.7）和Río de拉普拉塔河口（7.5 ± 2.5）中相似（p < 0.05），表明两个收集地点的栖息地利用相似。
Otolith core-to-edge Sr:Ca ratio was determined by laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) to analyze the salinity-habitat migration history of the silverside,Odontesthes bonariensis, within the Uruguay River (freshwater) and Río de la Plata Estuary (estuarine water) (Plata Basin, South America). Regular core-to-edge oscillations in Sr:Ca suggest that the silverside makes annual migrations between freshwater (<1 PSU) and brackish (>1 PSU) habitats, with no evidence of marine incursion or non-migratory individuals. Empirical equations that represent the relationship between conductivity/salinity and otolith Sr:Ca ratio were used to identify where in an otolith an individual transitioned between freshwater and brackish habitats. In most specimens, the first migration between habitats likely occurred within the first year of life. Average numbers of changes between stable Sr:Ca signatures (sites with different salinities) determined by Change-Point analysis were similar from Uruguay River (8.9 ± 3.7) and Río de la Plata Estuary (7.5 ± 2.5) for comparable age fish (p < 0.05), suggesting that habitat use is similar in both collection sites.