Chloride in water, metals in sediment and amphibian tissues and amphibian capture information from wetlands in the Williston Basin of Montana and North Dakota, 2015-2017

The data presented includes chloride concentration and specific conductance in surface water collected from 33 wetlands in the Williston Basin of Montana and North Dakota, 2015-2017 as well as count data for three species of amphibians captured at each wetland. Data also includes concentrations of metals in bed sediment and larval amphibians collected from 32 and 12 wetlands, respectively in 2015-2016. Abundance of barred tiger salamanders (Ambystoma mavortium), boreal chorus frogs (Pseudacris maculata), northern leopard frogs (Lithobates pipiens) was estimated at 33 wetlands from 2015-2017. Surface water was collected in the summer from each wetland in 2015-2017 at the same time as the amphibian surveys and analyzed for chloride. Wetland area, wetland depth and estimate of the percent shallows was also collected as habitat covariates. Specific conductance data were collected at all wetlands in order to determine the locally derived Contamination Index (chloride concentration/specific conductance). Bed sediment was collected from several locations in 32 wetlands (3 in 2015 and 30 in 2016), homogenized and analyzed for a suite of 28 metals in 2015 and 2016. Larval amphibian tissues from the three species were also analyzed for the same suite of 28 metals in 2015 and 2016. Larval barred tiger salamanders, boreal chorus frogs and northern leopard frogs were collected in 12 wetlands (2 in 2015 and 10 in 2016) and analyzed for a suite of 26 metals. Northern leopard frogs and tiger salamander larvae were analyzed as individuals while boreal chorus frogs were composited due to their small size.

本数据集涵盖2015-2017年间，从美国蒙大拿州与北达科他州威利斯顿盆地的33处湿地采集的地表水氯离子浓度、比电导率（specific conductance）数据，以及各湿地捕获的3种两栖动物的个体计数数据。数据集还涵盖2015-2016年间，分别从32处湿地与12处湿地采集的河床沉积物及两栖动物幼体的金属浓度数据。2015-2017年间，研究人员对33处湿地内的横斑虎纹钝口螈（Ambystoma mavortium）、北方雨蛙（Pseudacris maculata）及北方豹蛙（Lithobates pipiens）的种群丰度进行了估算。2015-2017年夏季，研究人员在开展两栖动物调查的同期采集各湿地的地表水样本，并对其中的氯离子浓度开展了检测分析。研究人员同时采集了湿地面积、水深及浅水区占比估算值，作为生境协变量。为计算本地化污染指数（Contamination Index，即氯离子浓度与比电导率的比值），研究人员为所有湿地采集了比电导率数据。2015年与2016年，研究人员从32处湿地的多个采样点位采集河床沉积物样本（2015年3处，2016年30处），经均质化处理后，对其中28种金属的浓度开展了检测分析。2015年与2016年，研究人员还针对上述3种两栖动物的幼体组织，完成了同组28种金属的浓度检测分析。2015年（2处湿地）与2016年（10处湿地），研究人员从12处湿地采集了横斑虎纹钝口螈、北方雨蛙及北方豹蛙的幼体样本，针对其中26种金属的浓度开展了检测分析。北方豹蛙与虎纹钝口螈幼体以个体为单位进行检测分析，而北方雨蛙因体型过小，采用混合样本完成检测分析。