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Functionally diverse microbial communities show resilience in response to a record-breaking rain event
Jordan R Walker1, Alaina C Woods1, Mary K Pierce1
1Department of Marine Biology, Texas A&M University at Galveston, Galveston, TX, USA.
ISME Communications
|November 8, 2023
Summary
Hurricane Harvey
Area of Science:
- Microbial ecology
- Environmental science
- Estuarine science
Background:
- Estuaries provide critical ecosystem services and support global populations.
- Hurricane Harvey caused unprecedented rainfall in the urbanized Galveston Bay estuary.
- This event disrupted natural nutrient and salinity gradients.
Purpose of the Study:
- To investigate the impact of Hurricane Harvey on microbial community structure and function in Galveston Bay.
- To understand the short-term (five-week) response of the microbial community to extreme precipitation.
- To test the hypothesis of a shift from marine to terrestrial/freshwater microbial dominance.
Main Methods:
- Metagenomic analysis was employed to characterize the microbial community.
- Samples were collected over five weeks post-Hurricane Harvey.
- Changes in species distribution and metabolic gene content were assessed.
Main Results:
- Significant shifts in microbial species distribution and metabolic functions were observed.
- Cyanobacteria, Verrucomicrobia, and Betaproteobacteria showed altered abundance and functional gene enrichment (e.g., photosynthesis, nitrogen fixation).
- Dominant microbial groups with diverse metabolic capabilities exhibited greater resilience with less fluctuation.
Conclusions:
- Massive precipitation events, like Hurricane Harvey, can significantly alter estuarine microbial communities.
- The microbial community demonstrated resilience, with diverse microorganisms contributing to maintaining ecosystem services despite disturbances.
- Urbanized estuaries are susceptible to extreme weather events, impacting their microbial inhabitants and functions.
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