Linked Life Data

15294812

Source:http://linkedlifedata.com/resource/pubmed/id/15294812

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pubmed-article:15294812pubmed:abstractTextPrior field studies by our group have demonstrated a relationship between fluvial deposition of heavy metals and hyporheic-zone microbial community structure. Here, we determined the rates of change in hyporheic microbial communities in response to heavy-metal contamination and assessed group-level differences in resiliency in response to heavy metals. A controlled laboratory study was performed using 20 flowthrough river mesocosms and a repeated-measurement factorial design. A single hyporheic microbial community was exposed to five different levels of an environmentally relevant metal treatment (0, 4, 8, 16, and 30% sterilized contaminated sediments). Community-level responses were monitored at 1, 2, 4, 8, and 12 weeks via denaturing gradient gel electrophoresis and quantitative PCR using group-specific primer sets for indigenous populations most closely related to the alpha-, beta-, and gamma-proteobacteria. There was a consistent, strong curvilinear relationship between community composition and heavy-metal contamination (R(2) = 0.83; P < 0.001), which was evident after only 7 days of metal exposure (i.e., short-term response). The abundance of each phylogenetic group was negatively affected by the heavy-metal treatments; however, each group recovered from the metal treatments to a different extent and at a unique rate during the course of the experiment. The structure of hyporheic microbial communities responded rapidly and at contamination levels an order of magnitude lower than those shown to elicit a response in aquatic macroinvertebrate assemblages. These studies indicate that hyporheic microbial communities are a sensitive and useful indicator of heavy-metal contamination in streams.lld:pubmed
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pubmed-article:15294812pubmed:dateRevised2010-9-20lld:pubmed
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pubmed-article:15294812pubmed:articleTitleDetermining rates of change and evaluating group-level resiliency differences in hyporheic microbial communities in response to fluvial heavy-metal deposition.lld:pubmed
pubmed-article:15294812pubmed:affiliationMicrobial Ecology Program, Division of Biological Sciences, The University of Montana, Missoula, MT 59812-1006, USA.lld:pubmed
pubmed-article:15294812pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:15294812pubmed:publicationTypeResearch Support, U.S. Gov't, Non-P.H.S.lld:pubmed
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