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首页> 外文期刊>Marine ecology progress series >Stable isotope (δ~(13)C and δ~(18)O) and Sr/Ca composition of otoliths as proxies for environmental salinity experienced by an estuarine fish
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Stable isotope (δ~(13)C and δ~(18)O) and Sr/Ca composition of otoliths as proxies for environmental salinity experienced by an estuarine fish

机译：稳定的同位素（δ〜（13）C和δ〜（18）O）和耳石的Sr / Ca组成作为河口鱼类所经历的环境盐度的代理

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The ability to identify past patterns of salinity habitat use in coastal fishes is viewed as a critical development in evaluating nursery habitats and their role in population dynamics. The utility of otolith tracers (δ~(13)C, δ~(18)O, and Sr/Ca) as proxies for environmental salinity was tested for the estuarine-dependent juvenile white perch Morone americana. Analysis of water samples revealed a positive relationship between the salinity gradient and δ~(18)O, δ~(13)C, and Sr/Ca values of water in the Patuxent River estuary. Similarly, analysis of otolith material from young-of-the-year white perch (2001, 2004, 2005) revealed a positive relationship between salinity and otolith δ~(13)C, δ~(18)O, and Sr/Ca values. In classifying fish to their known salinity habitat, δ~(18)O and Sr/Ca were moderately accurate tracers (53 to 79% and 75 % correct classification, respectively), and δ~(13)C provided near complete discrimination between habitats (93 to 100% correct classification). Further, δ~(13)C exhibited the lowest inter-annual variability and the largest range of response across salinity habitats. Thus, across estuaries, it is expected that resolution and reliability of salinity histories of juvenile white perch will be improved through the application of stable isotopes as tracers of salinity history.
机译：识别沿海鱼类过去盐碱化栖息地使用方式的能力被视为评估苗圃栖息地及其在种群动态中的作用的关键发展。测试了耳石示踪剂（δ〜（13）C，δ〜（18）O和Sr / Ca）作为环境盐度代理的效用，用于河口依赖性少年白鲈Morone americana。对水样的分析表明，盐度梯度与Patuxent河口水的δ〜（18）O，δ〜（13）C和水的Sr / Ca值呈正相关。同样，对年幼白鲈鱼（2001、2004、2005）中耳石材料的分析表明，盐度与耳石的δ〜（13）C，δ〜（18）O和Sr / Ca值呈正相关。 。在将鱼类分类为已知盐度栖息地时，δ〜（18）O和Sr / Ca是中等准确的示踪剂（分别正确分类的53至79％和75％），而δ〜（13）C几乎完全区分了栖息地（正确分类为93到100％）。此外，δ〜（13）C在整个盐度生境中表现出最低的年际变化和最大的响应范围。因此，预计在整个河口，通过使用稳定同位素作为盐度历史的示踪剂，可以提高幼年白鲈的盐度历史的分辨率和可靠性。

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