期刊
FEMS MICROBIOLOGY REVIEWS
卷 45, 期 5, 页码 -出版社
OXFORD UNIV PRESS
DOI: 10.1093/femsre/fuab010
关键词
aquatic prokaryotic communities; submarine groundwater discharge; coastal aquifers; subterranean estuaries; microbial diversity and ecology; ultrasmall prokaryotes
类别
资金
- Spanish Ministry of Science, Innovation and Universities (MICINN) through the GRAMMI project [RTI2018-099740-J-I00]
- project MEDISTRAES II [CGL2016-77122-C2]
- project OPAL [PID2019-110311RB-C21]
- Ministry for the Ecological Transition and the Demographic Challenge (MITECO) [SPIP202002595]
- Spanish government [CEX2019000928-S]
- Beatriu de Pinos postdoctoral programme of the Catalan Government [2017-BP-00334]
- Generalitat de Catalunya [2017SGR/156]
Despite the importance of submarine groundwater discharge for ocean biogeochemistry, the microbial dimension of SGD is still poorly understood, especially in coastal aquifers. Current challenges include describing the diversity of groundwater microbiota and studying microbial dynamics in chemical cycles, as well as marine bacterioplankton responses to SGD.
Despite the relevance of submarine groundwater discharge (SGD) for ocean biogeochemistry, the microbial dimension of SGD remains poorly understood. SGD can influence marine microbial communities through supplying chemical compounds and microorganisms, and in turn, microbes at the land-ocean transition zone determine the chemistry of the groundwater reaching the ocean. However, compared with inland groundwater, little is known about microbial communities in coastal aquifers. Here, we review the state of the art of the microbial dimension of SGD, with emphasis on prokaryotes, and identify current challenges and future directions. Main challenges include improving the diversity description of groundwater microbiota, characterized by ultrasmall, inactive and novel taxa, and by high ratios of sediment-attached versus free-living cells. Studies should explore microbial dynamics and their role in chemical cycles in coastal aquifers, the bidirectional dispersal of groundwater and seawater microorganisms, and marine bacterioplankton responses to SGD. This will require not only combining sequencing methods, visualization and linking taxonomy to activity but also considering the entire groundwater-marine continuum. Interactions between traditionally independent disciplines (e.g. hydrogeology, microbial ecology) are needed to frame the study of terrestrial and aquatic microorganisms beyond the limits of their presumed habitats, and to foster our understanding of SGD processes and their influence in coastal biogeochemical cycles.
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