Strontium Concentrations in Fish from the Davis Pond Freshwater Postdiversion Sampling (2007-2009) with a Comparison to Prediversion Levels (2001)

The diversion of freshwater from the Mississippi River is intended to mitigate saltwater intrusion from the Gulf of Mexico and to lessen the concomitant loss of wetland areas. Though effective, freshwater diversion can affect wildlife and habitat; therefore, prediversion and postdiversion data collections are necessary to identify effects. The Davis Pond freshwater diversion area is located between the Mississippi River and Bayou Lafourche and extends to Barataria Bay Basin, Louisiana. Results and interpretations from the prediversion biomonitoring done in 2001- which included data on fish, eagles, and bivalves - are presented in the U.S. Geological Survey (USGS) Scientific Investigations Report 2008-5067, "Davis Pond Freshwater Prediversion Biomonitoring Study: Freshwater Fisheries and Eagles." The postdiversion data generated approximately 6 years later from the sampling of fish whole bodies are presented here in this USGS Data Series. An accompanying log of postdiversion study site photographs was also produced in USGS Data Series 605, "Photographic Images Captured While Sampling for Bald Eagles near the Davis Pond Freshwater Diversion Structure in Barataria Bay, Louisiana (2009-10).

Figures 25A and 25C represent the concentration of strontium detected in largemouth bass, blue catfish and striped mullet samples collected in 2007-2009, approximately six years after the Davis Pond freshwater diversion structure was operational. Figure 25B compares these concentrations to those collected in the 2001 prediversion study. Samples are from the Mississippi River, Lake Cataouatche, Bayou Couba, and Lake Salvador.

从密西西比河调运淡水的初衷，是缓解墨西哥湾引发的盐水入侵，并减少伴随发生的湿地面积流失。
尽管淡水调运项目收效显著，但可能会对野生生物及其栖息地造成影响；因此，开展调运前与调运后的数据集采集工作，对识别其生态影响至关重要。
戴维斯塘淡水调运区域坐落于密西西比河与拉福什湾道（Bayou Lafourche）之间，延伸至路易斯安那州的巴拉塔里亚湾盆地（Barataria Bay Basin）。
2001年开展的调运前生物监测工作（涵盖鱼类、白头海雕与双壳类相关数据），其结果与解读已发表于美国地质调查局（U.S. Geological Survey, USGS）《科学调查报告2008-5067：戴维斯塘淡水调运前生物监测研究：淡水鱼类与白头海雕》。
本美国地质调查局数据系列收录了约6年后开展的采样工作所生成的调运后数据，采样对象为整条鱼体。
配套的调运后研究站点摄影日志，也收录于美国地质调查局数据系列605：《2009-2010年路易斯安那州巴拉塔里亚湾戴维斯塘淡水调运设施周边白头海雕采样过程中拍摄的影像资料》。
图25A与图25C展示了2007-2009年采集的大口黑鲈、蓝鲶与条纹鲻样本中检测到的锶浓度，此时距戴维斯塘淡水调运设施投入运行已约6年。
图25B将上述浓度与2001年调运前研究中采集的样本浓度进行了对比。采样点位涵盖密西西比河、卡托阿奇湖、库巴湾道与萨尔瓦多湖。