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Seasonal impact of grazing, resource availability, viral mortality and light on bulk and group-specific bacterioplankton growth rates in the coastal NW Mediterranean

AuthorsSánchez, Olga CSIC ORCID; Sebastián, Marta CSIC ORCID; Mabrito, Isabel; Gasol, Josep M. CSIC ORCID ; Ferrera, Isabel CSIC ORCID
Issue DateSep-2019
Citation16 Symposium of Aquatic Microbial Ecology: 98 (2019)
AbstractGrowth rate is an important ecological trait of the different marine microbes and in part determines the structure of bacterioplankton communities. Estimation of growth rates of specific groups is critical to understand their ecological roles and contributions to marine biogeochemical cycles. Bulk bacterial growth rates are generally low, of ca. 0.05 to 0.10 day-1, although it has been shown that particular groups can grow much faster. However, there is a general lack of information on what controls the growth rates of different types of prokaryotes. Different manipulation experiments were carried out during the four astronomical seasons in order to evaluate the impact of grazing, viral mortality, resource competition and light on the growth of prokaryotes in the coastal Blanes Bay Microbial Observatory, NW Mediterranean. Gross and net growth rates of different bacterioplankton groups, including Bacteroidetes, Rhodobacteraceae, the SAR11 clade, Gammaproteobacteria and its subgroups Alteromonadaceae and the NOR5/OM60 clade, were calculated from changes in cell numbers using Catalyzed Reporter Deposition Fluorescence In situ Hybridization. Maximal growth rates were achieved when both predation pressure and nutrient limitation were minimized, but in general the response to predation removal was stronger than that to nutrient availability. In contrast, no major effect of virus reduction was observed on growth rates. Alteromonadaceae consistently presented the highest rates, although all groups responded to the different treatments. The response to light availability was generally weaker than to the other controlling factors but it was variable over the seasons. In summer and spring, the growth rates of groups containing aerobic anoxygenic phototrophic members, such as the Rhodobacteraceae and the NOR5 clade, were stimulated by light whereas the SAR11 clade (likely containing proteorhodopsin) showed an enhancement of growth in all seasons. Overall, our results set thresholds on growth rates and allow to estimate the seasonally variable contribution of various bacterioplankton groups to the structure and function of microbial communities
Description16 Symposium of Aquatic Microbial Ecology (SAME16), “From Boat to Bench”- Integrating field observation with lab experiments, 1-6 September 2019, Potsdam, Germany.-- 1 page
Appears in Collections:(ICM) Comunicaciones congresos
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