Abstract
The effects of suspended particles (SP) of different concentrations and sizes on the secretion of exopolysaccharide (EPS) by Chlorella pyrenoidosa (C. pyrenoidosa) and Microcystis flos-aquae (M. flos-aquae) in Jinjiang Estuary, Fujian Province, China were studied in co-cultures of microalgae and SP. The results show that the SP concentration has an “inhibit–promote–inhibit” effect on the secretion of EPS by C. pyrenoidosa, whereby there is an optimal concentration of SP corresponding to the largest amount of EPS secreted by C. pyrenoidosa. Low concentrations had no significant effect on the secretion of EPS from M. flos-aquae (p > 0.05), whereas higher concentrations had an inhibitory effect. The C. pyrenoidosa EPS content was found to be significantly decreased in response to SP of small particle sizes (0–75 and 75–120 μm) and significantly increased for SP of large particle sizes (120–150 and 150–500 μm). Small particle sizes (0–75 and 75–120 μm) were found to be beneficial to the secretion of EPS from M. flos-aquae, and the promotion of EPS secretion gradually decreased with the increase in SP particle size. However, when the particle size was too large (120–150 and 150–500 μm), SP had no significant effect on EPS secretion. This study is helpful for understanding the microalgae EPS secretion response to SP and provides a scientific basis for studying the mechanism of EPS secretion by algae and the effect of SP on eutrophication of the estuary.
Highlights
Eutrophication and its resulting red tides have become one of the significant environmental problems in estuaries and coastal waters worldwide [1,2,3]
The results provide a scientific basis for studying the mechanism of the effects of suspended particles (SP) on EPS secretion by algae and on eutrophication of the estuary
Parameters values of physical and chemical parameters of SP are shown in Table
Summary
Eutrophication and its resulting red tides have become one of the significant environmental problems in estuaries and coastal waters worldwide [1,2,3]. Some studies have shown that blooms are caused by a large number of cyanobacteria and green algae [4,5,6]. Yerli et al [7] found that cyanobacteria and green algae dominate the microalgae community of Lake Mogan (Ankara, Turkey). Exopolysaccharide (EPS) is a bioactive polysaccharide secreted by algal cells during growth and reproduction. The synthesis and release of EPS are considered a result of the coordination between organisms and their growth environment [8,9]. The bloom of microalgae may lead to an increase in EPS production
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