Document of bibliographic reference 330545

BibliographicReference record

Type

Bibliographic resource

Type of document

Journal article

BibLvlCode

AS

Title

Microbial mat and surface sediment communities from a shallow oxbow lake in the Colorado River floodplain, Argentina

Abstract

The epi-sedimentary microbial community of a shallow oxbow lake in the Colorado River floodplain was studied along a transect running from its concave margin to the center. Physico-chemical parameters characterized the lake as hypersaline (S = 38.8 ± 0.7), alkaline (pH = 8.0 ± 0.2), and stagnant. Core samples of the topmost sediment were taken at three equidistant points for a diatom analysis; furthermore, the easily-detachable microbial mat was sampled at the center of the lake. Diatoms were dominated by biraphid taxa with benthic or epiphytic habits, while planktonic taxa were scarce. The microbial mat consisted in a millimeter-layered bio-sedimentary structure, presenting high organic matter (36.0 ± 0.2%) and chlorophyll a (144.1 ± 8.1 µg Chl a g⁻¹ DW sediment) contents. Filamentous cyanobacteria dominated the mat biomass in surface layers (0–6 mm), while motile benthic diatoms were the second-most abundant phototrophic group. Navicula salinicola was the dominant diatom. Heterotrophic components of community (proto- and metazoans) were also identified. Resistance biogenic structures such as chrysophyte stomatocysts and planktonic diatom resting spores, and abundant gypsum precipitates were found throughout, pointing to intrinsic hydro-ecological stress conditions (desiccation and salinity fluctuations) of an inland evaporitic system. This is the first report of microbial mats colonizing surface-sediments of an infilled oxbow lake.

WebOfScience code

https://www.webofscience.com/wos/woscc/full-record/WOS:000557945400001

Bibliographic citation

Fayó, R.; Pan, J.; Espinosa, M.A. (2020). Microbial mat and surface sediment communities from a shallow oxbow lake in the Colorado River floodplain, Argentina. Geomicrobiol. J. 37(10): 937-949. https://dx.doi.org/10.1080/01490451.2020.1801908

Is peer reviewed

true