2024-03-29T07:38:53Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/2369952022-03-07T05:31:00Zcom_10261_88com_10261_8col_10261_341
2021-04-07T08:34:02Z
urn:hdl:10261/236995
Ecological and metabolic thresholds in the bacterial, protist and fungal microbiome of ephemeral saline lakes (Monegros Desert, Spain)
Menéndez-Serra, Mateu
Triadó-Margarit, Xavier
Casamayor, Emilio O.
Salt gradient
Monegros desert
Bacteria
Eukaryotes
Inlandsaline lakes
Community ecology
Halophiles
16SrRNAgene
18SrRNAgene
We studied the 16S and 18S rRNA genes of the bacterial, protist, and fungal microbiomes of 131 samples collected in 14
ephemeral small inland lakes located in the endorheic area of the Monegros Desert (NE Spain). The sampling covered different
temporal flooding/desiccation cycles that created natural salinity gradients between 0.1% (w/v) and salt saturation. We aimed to
test the hypothesis of a lack of competitive advantage for microorganisms using the “salt-in” strategy in highly fluctuating
hypersaline environments where temperature and salinity transitions widely vary within short time periods, as in ephemeral
inland lakes. Overall, 5653 bacterial zOTUs and 2658 eukaryal zOTUs were detected heterogeneously distributed with signif-
icant variations on taxonomy and general energy-yielding metabolisms and trophic strategies along the gradient. We observed a
more diverse bacterial assembly than initially expected at extreme salinities and a lack of dominance of a few “salt-in” organisms.
Microbial thresholds were unveiled for these highly fluctuating hypersaline environments with high selective pressures. We
conclude that the extremely high dynamism observed in the ephemeral lakes of Monegros may have given a competitive
advantage for more versatile ("salt-out") organisms compared to those better adapted to stable high salinities usually more
common in solar salterns. Ephemeral inland saline lakes offered a well-suited natural framework for highly detailed evolutionary
and ecological studies.
2021-04-07T08:34:02Z
2021-04-07T08:34:02Z
2021
artículo
Microbial Ecology : doi:10.1007/s00248-021-01732-9 (2021)
0095-3628
1432-184X
http://hdl.handle.net/10261/236995
eng
https://doi.org/10.1007/s00248-021-01732-9
Sí
openAccess
Springer