Metal-macrofauna interactions determine microbial community structure and function in copper contaminated sediments.
Metal-macrofauna interactions determine microbial community structure and function in copper contaminated sediments.
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DOI：
10.1371/journal.pone.0064940
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发表时间：
2013
期刊：
影响因子：
3.7
通讯作者：
Thornton B
中科院分区：
文献类型：
--
作者：
Mayor DJ;Gray NB;Elver-Evans J;Midwood AJ;Thornton B
铜对细胞的健康运转至关重要，但当供过于求时，这种重金属很快就会变得有毒。由于2008年全球禁止使用有机锡产品，海洋沉积物普遍受到防污涂料的铜污染，而且污染程度越来越高。随着海水pH值的降低和温度的升高，铜的毒性在未来几年将会增加。我们使用析因中观实验来研究沉积物中铜浓度的增加和世界性生物扰动的端足类动物Corophium volutator的存在如何影响软沉积物微生物群落中的一系列生态系统功能。铜对底栖生物养分释放、细菌生物量、微生物群落结构和单个微生物膜[磷脂]脂肪酸(PLFAs)同位素组成的影响均不同。我们的数据一直表明，全球水道的铜污染将对底栖群落的新陈代谢功能产生普遍影响，这不能仅通过铜浓度来预测；影响将取决于栖息的大型动物及其生物扰动能力。这一发现对那些试图管理铜污染对生态系统服务的影响的人构成了重大挑战，例如跨不同生境的碳和养分循环。我们的工作还突显了关于导致自然海洋微生物群落中同位素分馏的过程的信息匮乏。我们的结论是，随着铜浓度的增加，底栖微生物的同化能力将逐渐减弱。这些影响将在一定程度上被生物扰动动物的存在以及可能增加含氧海水流入沉积物的其他过程所缓解。我们的发现支持采用生态系统方法进行环境管理。
Copper is essential for healthy cellular functioning, but this heavy metal quickly becomes toxic when supply exceeds demand. Marine sediments receive widespread and increasing levels of copper contamination from antifouling paints owing to the 2008 global ban of organotin-based products. The toxicity of copper will increase in the coming years as seawater pH decreases and temperature increases. We used a factorial mesocosm experiment to investigate how increasing sediment copper concentrations and the presence of a cosmopolitan bioturbating amphipod, Corophium volutator, affected a range of ecosystem functions in a soft sediment microbial community. The effects of copper on benthic nutrient release, bacterial biomass, microbial community structure and the isotopic composition of individual microbial membrane [phospholipid] fatty acids (PLFAs) all differed in the presence of C. volutator. Our data consistently demonstrate that copper contamination of global waterways will have pervasive effects on the metabolic functioning of benthic communities that cannot be predicted from copper concentrations alone; impacts will depend upon the resident macrofauna and their capacity for bioturbation. This finding poses a major challenge for those attempting to manage the impacts of copper contamination on ecosystem services, e.g. carbon and nutrient cycling, across different habitats. Our work also highlights the paucity of information on the processes that result in isotopic fractionation in natural marine microbial communities. We conclude that the assimilative capacity of benthic microbes will become progressively impaired as copper concentrations increase. These effects will, to an extent, be mitigated by the presence of bioturbating animals and possibly other processes that increase the influx of oxygenated seawater into the sediments. Our findings support the move towards an ecosystem approach for environmental management.
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影响因子：
4.8
作者：
Carpenter, SR
通讯作者：
Carpenter, SR
影响因子：
4.5
作者：
Breitburg, DL;Sanders, JG;Sellner, KG
通讯作者：
Sellner, KG
DOI：
10.1002/ieam.5630020114
发表时间：
2006-01-01
影响因子：
3.1
作者：
Apitz, Sabine E.;Elliott, Michael;Galloway, Tamara S.
通讯作者：
Galloway, Tamara S.
影响因子：
2.5
作者：
GERDOL, V;HUGHES, RG
通讯作者：
HUGHES, RG
影响因子：
9.7
作者：
Chander, K;Joergensen, RG
通讯作者：
Joergensen, RG