Heterotrophic bacterioplankton responses in coral- and algae-dominated Red Sea reefs show they might benefit from future regime shift

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Silva , L , Calleja , M L , Ivetic , S , Huete-Stauffer , T , Roth , F , Carvalho , S & Moran , X A G 2021 , ' Heterotrophic bacterioplankton responses in coral- and algae-dominated Red Sea reefs show they might benefit from future regime shift ' , The Science of the Total Environment , vol. 751 , 141628 . https://doi.org/10.1016/j.scitotenv.2020.141628

Title: Heterotrophic bacterioplankton responses in coral- and algae-dominated Red Sea reefs show they might benefit from future regime shift
Author: Silva, Luis; Calleja, Maria Ll.; Ivetic, Snjezana; Huete-Stauffer, Tamara; Roth, Florian; Carvalho, Susana; Moran, Xose Anxelu G.
Contributor: University of Helsinki, Biological stations
Date: 2021-01-10
Language: eng
Number of pages: 13
Belongs to series: The Science of the Total Environment
ISSN: 0048-9697
URI: http://hdl.handle.net/10138/323372
Abstract: In coral reefs, dissolved organic matter (DOM) cycling is a critical process for sustaining ecosystem functioning. However, global and local stressors have caused persistent shifts from coral- to algae-dominated benthic communities. The influence of such phase shifts on DOM nature and its utilization by heterotrophic bacterioplankton remains poorly studied. Every second month for one year, we retrieved seawater samples enriched in DOM produced by coral- and algae-dominated benthic communities in a central Red Sea reef during a full annual cycle. Seawater incubations were conducted in the laboratory under in situ temperature and light conditions by inoculating enriched DOM samples with bacterial assemblages collected in the surrounding waters. Dissolved organic carbon (DOC) concentrations were higher in the warmer months (May-September) in both communities, resulting in higher specific growth rates and bacterial growth efficiencies (BGE). However, these high summer values were significantly enhanced in algal-DOM relative to coral-DOM, suggesting the potential for bacterioplankton biomass increase in reefs with algae replacing healthy coral cover under warmer conditions. The potential exacerbation of heterotrophic bacterial activity in the ongoing widespread regime shift from coral- to algae-dominated communities may have detrimental consequences for the overall health of tropical coral reefs. (C) 2020 The Authors. Published by Elsevier B.V.
Subject: Coral-algae shifts
DOM lability
Heterotrophic bacteria
Growth rates
Bacterial growth efficiencies
Activation energies
DISSOLVED ORGANIC-MATTER
AQUATIC ENVIRONMENTS
BACTERIAL PRODUCTION
NATURAL-POPULATIONS
GROWTH EFFICIENCY
FLOW-CYTOMETRY
FLUORESCENCE
RESPIRATION
MICROBES
RELEASE
1172 Environmental sciences
1181 Ecology, evolutionary biology
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