Responses of physiological groups of tropical heterotrophic bacteria to temperature and DOM additions: food matters more than warming.
Type
ArticleKAUST Department
Biological and Environmental Sciences and Engineering (BESE) DivisionMarine Science Program
Microbial oceanography Research Group
Red Sea Research Center (RSRC)
Date
2020-04-15Online Publication Date
2020-04-15Print Publication Date
2020-05Embargo End Date
2021-04-07Submitted Date
2019-11-27Permanent link to this record
http://hdl.handle.net/10754/662482
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Show full item recordAbstract
Compared to higher latitudes, tropical heterotrophic bacteria may be less responsive to warming because of strong bottom-up control. In order to separate both drivers we determined the growth responses of bacterial physiological groups to temperature after adding dissolved organic matter (DOM) from mangroves, seagrasses and glucose to natural seawater from the Great Barrier Reef. Low (LNA) and high (HNA) nucleic acid content, membrane-intact (Live) and membrane-damaged (Dead) plus actively respiring (CTC+) cells were monitored for 4 days. Specific growth rates of the whole community were significantly higher (1.9 d-1 ) in the mangrove treatment relative to the rest (0.2-0.4 d-1 ) at in situ temperature and their temperature dependence, estimated as activation energy, was also consistently higher. Strong bottom-up control was suggested in the other treatments. Cell size depended more on DOM than temperature. Mangrove DOM resulted in significantly higher contributions of Live, HNA and CTC+ cells to total abundance while the seagrass leachate reduced Live cells below 50%. Warming significantly decreased Live and CTC+ cells contributions in most treatments. Our results suggest that only in the presence of highly labile compounds, such as mangroves DOM, can we anticipate increases in heterotrophic bacteria biomass in response to warming in tropical regions. This article is protected by copyright. All rights reserved.Citation
Morán, X. A. G., Baltar, F., Carreira, C., & Lønborg, C. (2020). Responses of physiological groups of tropical heterotrophic bacteria to temperature and DOM additions: food matters more than warming. Environmental Microbiology. doi:10.1111/1462-2920.15007Publisher
WileyJournal
Environmental microbiologyPubMed ID
32249543Additional Links
http://doi.wiley.com/10.1111/1462-2920.15007ae974a485f413a2113503eed53cd6c53
10.1111/1462-2920.15007
Scopus Count
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