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Title

Low heterotrophic activity but high growth potential of bacteria from coastal Mediterranean groundwater aquifers

AuthorsRuiz-González, Clara ; Maister, Olena; García-Orellana, Jordi; Gasol, Josep M.
Issue DateSep-2019
Citation16 Symposium of Aquatic Microbial Ecology: 41 (2019)
AbstractGroundwater discharge to the Mediterranean Sea has recently emerged as a much more important process than previously believed, delivering as many nutrients to coastal areas as rivers or atmospheric deposition. These groundwater inputs may impact coastal microbial communities indirectly through nutrient addition, or directly through inoculation of the diverse freshwater and soils bacterial taxa that are transported with the groundwater flow, but this has never been explored. Here we provide the first spatial characterization of bacterial communities inhabiting several subterranean aquifers along the Northwestern Mediterranean coast, and compare them with those from adjacent coastal sites and surface freshwater bodies. Combining bulk and single-cell activity measurements, CARD-FISH and 16 rRNA gene amplicon sequencing on both field and experimental samples, we show that groundwater bacterial communities are characterized by very low cell abundances, small cell sizes, and low in situ heterotrophic activity that seems to be dominated by Alphaproteobacterial groups. Experimental incubations of the same groundwater communities, however, showed a large potential for some of these groundwater taxa (mostly Gammaproteobacteria) to grow upon changes in conditions, even when mixing with marine waters, suggesting that many groundwater bacteria are in a dormant state but keep the potential for rapid growth upon environmental changes. A comparison of the 16S rRNA-taxonomic composition of groundwater and seawater bacterial communities suggests connectivity between groundwater and seawater sites in terms of microbial dispersal. We propose that these unexplored coastal aquifers may represent reservoirs of microbial diversity for the coastal Mediterranean Sea
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
URIhttp://hdl.handle.net/10261/192224
Appears in Collections:(ICM) Comunicaciones congresos
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