Sources of Nonnative Centrarchids in the Upper Colorado River Revealed by Stable Isotope and Microchemical Analyses of Otoliths
Sources of Nonnative Centrarchids in the Upper Colorado River Revealed by Stable Isotope and Microchemical Analyses of Otoliths
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耳石的稳定同位素和微化学分析揭示了科罗拉多河上游非本地中心虫的来源
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发表时间：
2007
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影响因子：
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通讯作者：
Anita M. Martinez
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作者：
G. Whitledge;Brett M. Johnson;P. Martinez;Anita M. Martinez
摘要外来鱼类是濒危鱼类恢复的重要障碍，包括美国西南部科罗拉多河特有的鱼类。控制科罗拉多河流域上游非土著鱼类丰度的努力没有取得成功，部分原因是缺乏关于非土著鱼类招募来源的知识。我们用稳定的氢同位素组成(δD)和鱼耳石中锶与钙的比值(锶：钙)作为环境历史的自然标志，确定了科罗拉多河上游非原生中原鱼类(大口黑嘴鱼、青太阳鱼、蓝鳍金枪鱼和黑斑蟹)的来源栖息地(泛滥池塘和河流栖息地)。稳定的氢同位素分析表明，59%的中心类具有河源鱼类应有的耳石核心特征，22%的中心类是从泛滥平原池塘迁徙过来的，19%的中心类具有来源不明的特征。锶。
Abstract Nonnative fishes represent a significant impediment to the recovery of imperiled fishes, including those endemic to the Colorado River in the southwestern United States. Efforts to control nonindigenous fish abundance in the upper Colorado River basin have been unsuccessful owing in part to lack of knowledge regarding nonnative fish recruitment sources. We determined the source habitat (floodplain pond versus riverine habitats) for nonnative centrarchid fishes (largemouth bass Micropterus salmoides, green sunfish Lepomis cyanellus, bluegill L. macrochirus, and black crappie Pomoxis nigromaculatus) in the upper Colorado River using stable hydrogen isotopic composition (δD) and strontium: Calcium (Sr: Ca) ratios in fish otoliths as natural markers of environmental history. Stable hydrogen isotope analysis revealed that 59% of centrarchids exhibited the otolith core signatures expected for riverine-origin fish, while 22% had emigrated from floodplain ponds and 19% were of uncertain origin. Strontium...