Bacterial community response to petroleum contamination and nutrient addition in sediments from a temperate salt marsh.
Bacterial community response to petroleum contamination and nutrient addition in sediments from a temperate salt marsh.
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DOI：
10.1016/j.scitotenv.2013.04.015
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发表时间：
2013-08
期刊：
影响因子：
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通讯作者：
H. Ribeiro;A. Mucha;C. Almeida;A. Bordalo
中科院分区：
文献类型：
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作者：
H. Ribeiro;A. Mucha;C. Almeida;A. Bordalo
微生物群落在沉积物中有机污染物（包括碳氢化合物）的生物降解过程中起着重要作用。本研究的目的是评估温带盐沼微生物群落对石油污染的反应，在社区结构，丰度和能力，以降解碳氢化合物。沉积物的非殖民化和殖民化（根沉积物）灯心草maritimus，芦苇和Triglochin striata收集在温带河口（利马，葡萄牙西北部），掺有石油在可变的营养条件下，并孵育15天。结果表明，植物物种形成是形成根际群落结构的主要因素，超过石油的影响。此外，当暴露于石油污染时，不同的盐沼微生物群落的反应类似于（i）丰度增加，（ii）结构变化，（iii）多样性降低。社区，特别是那些与J. maritimus和P. australis根显示出降解石油烃的潜力，降解百分比在15%和41%之间，这取决于沉积物类型和营养条件。总之，不同的盐沼微生物群落对石油污染的反应相似，但表现出不同的速度，营养需求，其生物降解的潜力，这应该考虑到在制定生物修复策略。
Microbial communities play an important role in the biodegradation of organic pollutants in sediments, including hydrocarbons. The aim of this study was to evaluate the response of temperate salt marsh microbial communities to petroleum contamination, in terms of community structure, abundance and capacity to degrade hydrocarbons. Sediments un-colonized and colonized (rhizosediments) by Juncus maritimus, Phragmites australis and Triglochin striata were collected in a temperate estuary (Lima, NW Portugal), spiked with petroleum under variable nutritional conditions, and incubated for 15days. Results showed that plant speciation emerged as the major factor for shaping the rhizosphere community structure, overriding the petroleum influence. Moreover, when exposed to petroleum contamination, the distinct salt marsh microbial communities responded similarly with (i) increased abundance, (ii) changes in structure, and (iii) decreased diversity. Communities, particularly those associated to J. maritimus and P. australis roots displayed a potential to degrade petroleum hydrocarbons, with degradation percentages between 15% and 41%, depending on sediment type and nutritional conditions. In conclusion, distinct salt marsh microbial communities responded similarly to petroleum contamination, but presented different pace, nutritional requirements, and potential for its biodegradation, which should be taken into account when developing bioremediation strategies.