Abstract Understanding patterns in trace element concentrations and water quality within river systems provides a foundation to evaluate retrospective movements and habitat use of fish. Because trace elements are incorporated into calcified structures of fishes relative to water concentrations, baseline maps have application for fisheries management, including for rare species such as sturgeons. Therefore, trace elements [strontium (Sr), barium (Ba), manganese (Mn), zinc (Zn), and magnesium (Mg)], strontium isotopes (87Sr/86Sr), dissolved oxygen and salinity were measured in the Pearl River and Lake Pontchartrain watersheds, within Mississippi and Louisiana, USA for application in assessing riverine use by Gulf Sturgeon Acipenser oxyrinchus desotoi. Water samples were collected during the summer-fall period when juvenile Gulf Sturgeon were anticipated to be present and analyzed by solution and multi-collector inductively coupled plasma mass spectrometry. Trace element to calcium (Ca) ratios in Sr, Ba, Zn, and Mg were distinguishable between the upper Pearl River and the Bogue Chitto River tributary, and the upper Pearl River and lower Pearl River. For most trace elements and 87Sr/86Sr, there was a gradual increase from upper river regions to lower river regions, and large differences between freshwater and saline areas. Lake Pontchartrain watershed rivers were not easily differentiated, but regions of low dissolved oxygen concentrations in the lower reaches suggest available Gulf Sturgeon habitat may be seasonally limited. Therefore, maps of water microchemistry in the Pearl River watershed allow for retrospective analyses of fish watershed use.

中文翻译：

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温带河流系统中微量元素和锶同位素水化学的空间变化与鲟鱼运动的应用

摘要 了解河流系统中微量元素浓度和水质的模式为评估鱼类的回顾性运动和栖息地利用奠定了基础。由于微量元素被纳入相对于水浓度的鱼类钙化结构，基线图可用于渔业管理，包括鲟鱼等稀有物种。因此，对珠江中的微量元素[锶(Sr)、钡(Ba)、锰(Mn)、锌(Zn)和镁(Mg)]、锶同位素(87Sr/86Sr)、溶解氧和盐度进行了测量和美国密西西比州和路易斯安那州内的庞恰特雷恩湖流域，用于评估墨西哥湾鲟Acipenser oxyrinchus desotoi 的河流使用情况。在预计会出现幼年海湾鲟鱼的夏秋期间收集水样，并通过溶液和多收集器电感耦合等离子体质谱法进行分析。Sr、Ba、Zn 和 Mg 中微量元素与钙 (Ca) 的比率在珠江上游和博格奇托河支流之间以及珠江上游和珠江下游之间是可区分的。大多数微量元素和87Sr/86Sr从上游地区向下游地区逐渐增加，淡水和咸水地区差异较大。庞恰特雷恩湖流域河流不容易区分，但下游溶解氧浓度低的地区表明可用的海湾鲟鱼栖息地可能受到季节性限制。所以，