Experimental Warming Decreases the Average Size and Nucleic Acid Content of Marine Bacterial Communities
KAUST DepartmentBiological and Environmental Sciences and Engineering (BESE) Division
Marine Science Program
Red Sea Research Center (RSRC)
Permanent link to this recordhttp://hdl.handle.net/10754/613034
MetadataShow full item record
AbstractOrganism size reduction with increasing temperature has been suggested as a universal response to global warming. Since genome size is usually correlated to cell size, reduction of genome size in unicells could be a parallel outcome of warming at ecological and evolutionary time scales. In this study, the short-term response of cell size and nucleic acid content of coastal marine prokaryotic communities to temperature was studied over a full annual cycle at a NE Atlantic temperate site. We used flow cytometry and experimental warming incubations, spanning a 6°C range, to analyze the hypothesized reduction with temperature in the size of the widespread flow cytometric bacterial groups of high and low nucleic acid content (HNA and LNA bacteria, respectively). Our results showed decreases in size in response to experimental warming, which were more marked in 0.8 μm pre-filtered treatment rather than in the whole community treatment, thus excluding the role of protistan grazers in our findings. Interestingly, a significant effect of temperature on reducing the average nucleic acid content (NAC) of prokaryotic cells in the communities was also observed. Cell size and nucleic acid decrease with temperature were correlated, showing a common mean decrease of 0.4% per °C. The usually larger HNA bacteria consistently showed a greater reduction in cell and NAC compared with their LNA counterparts, especially during the spring phytoplankton bloom period associated to maximum bacterial growth rates in response to nutrient availability. Our results show that the already smallest planktonic microbes, yet with key roles in global biogeochemical cycling, are likely undergoing important structural shrinkage in response to rising temperatures.
CitationExperimental Warming Decreases the Average Size and Nucleic Acid Content of Marine Bacterial Communities 2016, 7 Frontiers in Microbiology
SponsorsThis work was supported by the Spanish Ministry of Economy and Competitiveness (MINECO) through funding of the COMITE (Coastal Ocean MIcrobial plankton and TEmperature) project (CTM-2010-15840) and the associated Ph.D. scholarship (BES-2011-048573) to TH-S, as well as the time-series project RADIALES of the IEO. As well, the Basque Government provided NA-G with a Ph.D. scholarship.
PublisherFrontiers Media SA
JournalFrontiers in Microbiology
- More, smaller bacteria in response to ocean's warming?
- Authors: Morán XA, Alonso-Sáez L, Nogueira E, Ducklow HW, González N, López-Urrutia Á, Díaz-Pérez L, Calvo-Díaz A, Arandia-Gorostidi N, Huete-Stauffer TM
- Issue date: 2015 Jul 7
- Temperature dependences of growth rates and carrying capacities of marine bacteria depart from metabolic theoretical predictions.
- Authors: Huete-Stauffer TM, Arandia-Gorostidi N, Díaz-Pérez L, Morán XA
- Issue date: 2015 Oct
- Impact of planktonic low nucleic acid-content bacteria to bacterial community structure and associated ecological functions in a shallow lake.
- Authors: Song Y, Wang Y, Mao G, Gao G, Wang Y
- Issue date: 2019 Mar 25
- Low Abundances but High Growth Rates of Coastal Heterotrophic Bacteria in the Red Sea.
- Authors: Silva L, Calleja ML, Huete-Stauffer TM, Ivetic S, Ansari MI, Viegas M, Morán XAG
- Issue date: 2018
- Spatio-Temporal Variations of High and Low Nucleic Acid Content Bacteria in an Exorheic River.
- Authors: Liu J, Hao Z, Ma L, Ji Y, Bartlam M, Wang Y
- Issue date: 2016