Spatiotemporal variation of extracellular polymeric substances (EPS) associated with the microphytobenthos of tidal flats in the Yellow Sea

MARINE POLLUTION BULLETIN

卷:171

Article

Kim, Beomgi^1,2  Lee, Jongmin^1,2  Noh, Junsung^1,2  Bae, Hanna^1,2  Lee, Changkeun^1,2  Ha, Hun Jun³  Hwang, Kyuwon^1,2  Kim, Dong-U^1,2  Kwon, Bong-Oh⁴  Ha, Ho Kyung³  Pierre, Guillaume⁵  Delattre, Cedric^5,6  Michaud, Philippe⁵  Khim, Jong Seong^1,2 

[1] Seoul Natl Univ, Sch Earth & Environm Sci, 1 Gwanak Ro, Seoul 08826, South Korea

[2] Seoul Natl Univ, Res Inst Oceanog, 1 Gwanak Ro, Seoul 08826, South Korea

[3] Inha Univ, Dept Ocean Sci, Incheon 22212, South Korea

[4] Kunsan Natl Univ, Dept Marine Biotechnol, Kunsan 54150, South Korea

[5] Univ Clermont Auvergne, Inst Pascal, SIGMA Clermont, CNRS, F-63000 Clermont Ferrand, France

[6] Inst Univ France IUF, 1 Rue Descartes, F-75005 Paris, France

关键词: Microalgae;    Benthic diatoms;    Algal blooms;    Sediment stabilization;    Sediment erodibility;    Intertidal flat;   

DOI  :  10.1016/j.marpolbul.2021.112780

来源: Elsevier

【 摘 要 】

The physical functions of extracellular polymeric substances (EPS), viz., by-product of microphytobenthos (MPB), in tidal flat system are well documented, but some ecological aspects remain unknown. We investigated MPB biomass (Chl-a), EPS, diatom assemblage, and erodibility in two contrasting tidal flat environments (megatidal vs. macrotidal flat) in the Yellow Sea. Thick biofilms were observed when MPB bloomed, with high Chl-a and increased EPS concentrations. Among diatom genera, Navicula was the most dominant taxa found over the year (mean 41%) in both areas. Compared with non-bloom periods, the erodibility decreased by 54-73% as biofilm thickened during the blooms. It was attributed to the elevated abundance of large-sized (>40 mu m) Navicula, which was expected to secrete large amounts of EPS. Overall, we successfully demonstrated spatiotemporal differences of sediment stabilization that significantly related to ecological variations of MPB, and identified the key diatom genus as a sediment stabilizer in the typical tidal flats of the Yellow Sea.

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