SRE4 Metals in O'Brien Bay sediments

Sediment Recruitment Experiment 4 (SRE4) was a large, long term (5 year) field experiment run at Casey Station (from 2001 to 2006) testing the effects of 4 different hydrocarbons on marine sediment ecosystems. Four different types of hydrocarbons were individually mixed with defaunated marine sediments and deployed in trays on the seabed at O'Brien Bay-1. Trays were collected after deployment periods of 5 weeks, 56 weeks, 62 weeks, 2 years and 5 years. In addition there was a bioturbation treatment using the burrowing urchin Abatus (at 56 weeks only). Samples were collected from 4 replicate trays of each treatment at each sampling time. Analyses were done of sediment hydrocarbon chemistry, microbial communities, meiofaunal communities, macrofaunal communities and diatom communities. The hydrocarbon treatments were: a synthetic Mobil lubricating oil; the same Mobil lubricating oil after 125? hours use in a vehicle engine; a Fuchs synthetic lubricating oil marketed as highly biodegradable; and Special Antarctic Blend diesel fuel (SAB). A control uncontaminated sediment treatment was used for comparison.

沉积物招募实验4（Sediment Recruitment Experiment 4, SRE4）是一项于2001年至2006年在凯西站（Casey Station）开展的大型长期（为期5年）野外实验，旨在探究4种不同烃类物质对海洋沉积物生态系统的影响。研究将4种不同烃类分别与脱除底栖动物的海洋沉积物混合，随后放置于奥布赖恩湾-1（O'Brien Bay-1）海床的实验托盘内。分别在部署后5周、56周、62周、2年及5年时回收实验托盘。此外，实验还设置了仅在56周时开展的生物扰动处理，所用受试生物为穴居海胆Abatus属物种。每个处理组在每个采样时间点均采集4个重复托盘样本。分析指标涵盖沉积物烃类化学组成、微生物群落、小型底栖生物群落、大型底栖生物群落及硅藻群落。本次实验的烃类处理组包括：美孚（Mobil）合成润滑油；经车辆发动机使用125小时后的同款美孚合成润滑油；以高生物降解性为宣传卖点的福斯（Fuchs）合成润滑油；以及南极专用混合柴油（Special Antarctic Blend, SAB）。实验同时设置未受污染的对照沉积物处理组，用于组间对照比较。