期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 751, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2020.141628
关键词
Coral-algae shifts; DOM lability; Heterotrophic bacteria; Growth rates; Bacterial growth efficiencies; Activation energies
资金
- King Abdullah University of Science and Technology (KAUST)
- Saudi Aramco/KAUS1 Center for Marine Environmental Observations
This study investigated the impact of DOM cycling on heterotrophic bacterioplankton in coral reefs. It found that DOC concentrations were higher in warmer months, with algal-DOM showing higher values, potentially leading to increased bacterial biomass.
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.
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