Resilience Of Coastal Marsh Microbial Communities To Saltwater Intrusion
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Resilience Of Coastal Marsh Microbial Communities To Saltwater Intrusion

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  • Personal Author:
  • NOAA Program & Office:
  • Sea Grant Program:
    LSU (Louisiana Sea Grant)
  • Description:
    Environmental change threatens to alter communities across the globe. While much work has investigated the impacts of global change on plant and animal communities, less is known about how microbes respond to global change. We tested how saltwater intrusion affects microbial communities in Gulf Coast marshes using a field salt addition experiment. We further tested whether the history, or legacy, of saltwater disturbance in a plot influenced how communities responded to a single saltwater pulse. We hypothesized that microbial communities would generally be resistant (not change greatly) and resilient (revert back to pre-disturbance conditions quickly) to saltwater pulses but that plots with a legacy of salt disturbance will be more resistant and resilient compared to plots that are naïve to salt addition. We found that overall microbial communities were surprisingly resistant to saltwater disturbance: plots with a legacy of saltwater disturbance displayed no significant effect of the salt addition (complete resistance), and plots that were naïve to salt displayed a minor effect of salt addition (high resistence) that reverted back to original composition within eight days (high resilience). This is the first evidence that the local microbial community in Gulf Coast marshes is well adapted to withstand changes in salinity, which bodes well for the response of microbial communities to global change in the Gulf Coast.
  • Format:
    PDF
  • Document Type:
    Technical Report
  • License:
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    CC0 Public Domain
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    Submitted
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