A manipulative field experiment examining the effect of heavy metal and hydrocarbon contaminated sediment on the recruitment of soft-sediment infauna.

The effects of hyrdocarbon and heavy metal contamination of marine sediments on recruitment of soft-sediment assemblages were examined in a field experiment at Casey Station, East Antarctica. Three locations were used, a polluted bay adjacent to an old disused tip site (Brown Bay) and two control locations (O'Brien Bay and Sparkes Bay). At each location three types of defaunated sediment (hydrocarbon treated, heavy metal treated and control) were placed at approximately 15 m depth and left in place for 3 months, from December to February. Sediments were artificially contaminated with hydrocarbons and metals at concentrations which were representative of levels found in sediments at contaminated sites around Casey Station.There were large differences in recruitment between the three locations and significant differences between the control and contaminated sediment. Sediments in the experiment were also examined for evidence of degradation and attenuation of hydrocarbons and heavy metals. A total of 104 recruitment samples were collected. Samples were sieved at 500 micro m and sorted mainly to species. Other work to arise from this experiment includes examination of the effects on diatom communities and microbial communities.Data includes fauna, metals and hydrocarbon concentrations in experiment. Pre-deployment concentrations (before experiment was deployed in water) are indicated as 'pre-deployment'. Concentrations of contaminants in sediments surrounding the experiment (within several metres) are indicated as 'surrounding'.This project also links to ASAC 1100.The fields in this dataset are:LocationSiteTreatment (tmt)Site and replicateSpeciesToxicityArsenicCadmiumCopperLeadSilverZincSpecial Antarctic Blend Fuel (SAB)LubeTPH

本研究于南极东部凯西站（Casey Station）开展野外控制实验，探究海洋沉积物烃类与重金属污染对软沉积底栖群落幼体招募的影响。实验共设置3处采样位点：一处为毗邻废弃旧垃圾填埋场的污染海湾——布朗湾（Brown Bay），另外两处为对照位点：奥布莱恩湾（O'Brien Bay）与斯帕克斯湾（Sparkes Bay）。

在每个位点处，将3种脱除底栖动物的沉积物分别放置于约15米水深处，原位放置3个月（12月至次年2月）。三种沉积物分别为：烃类污染处理组、重金属污染处理组与对照组。沉积物中的烃类与重金属浓度均参照凯西站周边污染沉积物的实际水平进行人工配制。

实验结果显示，三处位点的群落幼体招募量存在显著差异，对照组沉积物与污染处理组沉积物的幼体招募量亦存在显著统计学差异。本实验同时对沉积物中烃类与重金属的降解与衰减情况进行了检测。

实验共采集104份幼体招募样本，样本经500微米孔径筛网筛分后，主要鉴定至物种水平。基于本实验的后续研究还涵盖了污染对硅藻群落与微生物群落的影响探究。

本数据集包含实验中的底栖动物、重金属与烃类浓度数据。实验部署前的沉积物浓度以"pre-deployment"标注（即实验入水前的浓度）；实验周边数米范围内的沉积物污染物浓度则以"surrounding"标注。本项目同时关联ASAC 1100项目。

本数据集包含以下字段：位点（Location）、采样点（Site）、处理组（Treatment，简称tmt）、位点与重复样（Site and replicate）、物种（Species）、毒性（Toxicity）、砷（Arsenic）、镉（Cadmium）、铜（Copper）、铅（Lead）、银（Silver）、锌（Zinc）、南极专用混合燃料（Special Antarctic Blend Fuel，SAB）、润滑油（Lube）、总石油烃（TPH）。