Abstract:
:The effects of linear alpha olefin (LAO) nonaqueous drilling fluid on benthic macrofauna were assessed over a six year period at a southern Caspian Sea petroleum exploration site. A wide-ranging, pre-drilling survey identified a relatively diverse shelf-depth macrofauna numerically dominated by amphipods, cumaceans, and gastropods that transitioned to a less diverse assemblage dominated by hypoxia-tolerant annelid worms and motile ostracods with increasing depth. After drilling, a similar transition in macrofauna assemblage was observed with increasing concentration of LAO proximate to the shelf-depth well site. Post-drilling results were consistent with a hypothesis of hypoxia from microbial degradation of LAO, supported by the presence of bacterial mats and lack of oxygen penetration in surface sediment. Chemical and biological recoveries at ≥200m distance from the well site were evident 33months after drilling ceased. Our findings show the importance of monitoring recovery over time and understanding macrofauna community structure prior to drilling.
journal_name
Mar Pollut Bulljournal_title
Marine pollution bulletinauthors
Tait RD,Maxon CL,Parr TD,Newton FC 3rddoi
10.1016/j.marpolbul.2016.02.079subject
Has Abstractpub_date
2016-09-15 00:00:00pages
520-527issue
1eissn
0025-326Xissn
1879-3363pii
S0025-326X(16)30121-7journal_volume
110pub_type
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journal_title:Marine pollution bulletin
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journal_title:Marine pollution bulletin
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journal_title:Marine pollution bulletin
pub_type: 杂志文章,评审
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journal_title:Marine pollution bulletin
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journal_title:Marine pollution bulletin
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