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，简称SRE4）是一项为期5年的大型野外实验，于2001年至2006年在凯西站（Casey Station）开展，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。研究人员将4类不同的烃类物质分别与脱除底栖动物的海洋沉积物混合，随后将混合物装填至培养托盘中，部署于奥布莱恩湾1号（O'Brien Bay-1）的海床之上。分别于投放后5周、56周、62周、2年及5年这5个时间点回收培养托盘。此外，实验还设置了生物扰动处理组，仅在投放56周时利用穴居海胆Abatus开展扰动操作。在每个采样时间点，从每个处理组的4个重复托盘中采集样本。随后针对沉积物的烃类化学组成、微生物群落、小型底栖生物群落、大型底栖生物群落以及硅藻群落开展了系统性分析。本次实验的烃类处理组具体包括：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；福斯（Fuchs）一款主打高生物降解性的合成润滑油；以及南极专用混合柴油（Special Antarctic Blend diesel fuel，简称SAB）。实验同时设置了未受污染的沉积物对照组，用于对照比较。