Data for assessing the status of sediment toxicity and macroinvertebrate communities in the Eighteenmile Creek Area of Concern, New York, 2014

Data from 10-day sediment toxicity tests of bed sediments from the Eighteenmile Creek Area of Concern and Oak Orchard Creek (nearby reference stream), Niagara and Orleans County, New York, respectively. Specifically, the data was used to compare the survival and growth of two macroinvertebrate species in sediments from study sites and laboratory controls. Results are from 10-day sediment exposures of two test species, Chironomus dilutus and Hyalella azteca. Sediment samples were collected from five sites on each stream. Bed-sediments were collected from depositional areas using a petite Ponar (0.03 square meter) dredge. At each site, approximately five grabs were composited into a bucket, mixed, and a 4-liter (L) subsample was stored in a polyethylene container. Sediment toxicity testing were then conducted by a contract laboratory to quantify toxicity with the dipteran, Chironomus dilutus, and the amphipod, Hyalella azteca, during 10-day survival and growth bioassays following USEPA test methods 100.2 and 100.1, respectively. U.S. Environmental Protection Agency, 2000, Methods for measuring the toxicity and bioaccumulation of sediment associated contaminants with freshwater invertebrates. Second edition: U.S. Environmental Protection Agency, Office of Research and Development EPA 600/R-99/064. This spreadsheet contains 13 columns. The first 7 columns describe the sample collection information, the remaining 6 columns provide the survival and growth results of two test species used in sediment toxicity tests. The data include the stream name, site ID, latitude and longitude, replicate number, and site type. Six columns of results from 10-day sediment exposures of two test species, Chironomus dilutus and Hyalella azteca. The following endpoints were measured for each species following the 10-day exposure: number of surviving organisms, percentage of organisms surviving (hereafter survival), and average ash-free dry weight of the surviving organisms (hereafter growth).

本数据集源自纽约州尼亚加拉县与奥尔良县的十八英里溪重点关注区域（Eighteenmile Creek Area of Concern）及橡树奥查德溪（Oak Orchard Creek，邻近参照溪流）的底泥10天毒性测试数据。具体而言，本数据集用于对比两种大型底栖无脊椎动物（macroinvertebrates）在研究区域底泥与实验室对照组底泥中的存活与生长表现。测试数据源自两种受试物种——摇蚊（Chironomus dilutus）与钩虾（Hyalella azteca）的10天底泥暴露实验。研究人员分别从两条溪流的5个采样点采集底泥样品：采用小型Ponar（0.03平方米）挖泥船于沉积区域采集床底沉积物，每个采样点采集约5份底泥样品并混合至容器中，随后取4升（L）子样品储存于聚乙烯容器内。随后，合同实验室依据美国环境保护署（U.S. Environmental Protection Agency, USEPA）的测试方法100.2与100.1，分别对双翅目受试物种摇蚊（Chironomus dilutus）及端足目受试物种钩虾（Hyalella azteca）开展10天存活与生长生物测试，以量化底泥毒性。相关测试方法源自美国环境保护署2000年发布的《淡水无脊椎动物沉积物污染物毒性与生物蓄积测定方法》（第二版，美国环境保护署研究与开发办公室，EPA 600/R-99/064）。本电子表格共包含13列数据：前7列为样品采集信息，剩余6列为两种受试物种在底泥毒性测试中的存活与生长结果。采集信息包括溪流名称、采样点ID、经纬度、重复编号及采样点类型。6项结果列对应两种受试物种的10天底泥暴露实验数据，针对每个物种的测试终点包括：暴露10天后的存活生物体数量、生物体存活率（下称存活率），以及存活生物体的平均无灰干重（下称生长量）。