Testing the Metabolic Theory of Ecology with marine bacteria: Different temperature sensitivity of major phylogenetic groups during the spring phytoplankton bloom
Huete-Stauffer, Tamara Megan
Moran, Xose Anxelu G.
KAUST DepartmentBiological and Environmental Sciences and Engineering (BESE) Division
Red Sea Research Center (RSRC)
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AbstractAlthough temperature is a key driver of bacterioplankton metabolism, the effect of ocean warming on different bacterial phylogenetic groups remains unclear. Here, we conducted monthly short-term incubations with natural coastal bacterial communities over an annual cycle to test the effect of experimental temperature on the growth rates and carrying capacities of four phylogenetic groups: SAR11, Rhodobacteraceae, Gammaproteobacteria and Bacteroidetes. SAR11 was the most abundant group year-round as analysed by CARD-FISH, with maximum abundances in summer, while the other taxa peaked in spring. All groups, including SAR11, showed high temperature-sensitivity of growth rates and/or carrying capacities in spring, under phytoplankton bloom or post-bloom conditions. In that season, Rhodobacteraceae showed the strongest temperature response in growth rates, estimated here as activation energy (E, 1.43 eV), suggesting an advantage to outcompete other groups under warmer conditions. In summer E values were in general lower than 0.65 eV, the value predicted by the Metabolic Theory of Ecology (MTE). Contrary to MTE predictions, carrying capacity tended to increase with warming for all bacterial groups. Our analysis confirms that resource availability is key when addressing the temperature response of heterotrophic bacterioplankton. We further show that even under nutrient-sufficient conditions, warming differentially affected distinct bacterioplankton taxa. This article is protected by copyright. All rights reserved.
CitationArandia-Gorostidi N, Huete-Stauffer TM, Alonso-Sáez L, G. Morán XA (2017) Testing the Metabolic Theory of Ecology with marine bacteria: Different temperature sensitivity of major phylogenetic groups during the spring phytoplankton bloom. Environmental Microbiology. Available: http://dx.doi.org/10.1111/1462-2920.13898.
SponsorsWe are grateful to Basque Government for supporting N.A.G.’s PhD fellowship and to the Spanish Ministry of Economy and Competitiveness (MINECO) for supporting T.M.HS.’ s PhD fellowship, L.A.S.’s Juan de la Cierva and Ramon y Cajal fellowships and the COMITE project (CTM-2010–15840). The Spanish Institute of Oceanography (IEO) time-series programme Radiales provided logistic support for seawater collection. We are especially thankful to all the staff of the R/V “José de Rioja” for their help during the sampling collection and L. Díaz, A. Calvo-Díaz and E. Nogueira for their help during the experiments.
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