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Abundance, characteristics, and size spectra of transparent exopolymer particles and Coomassie stainable particles during spring in a large shallow lake, Taihu, China

Author:
Huang, Qi, Liu, Lizhen, Qin, Boqiang, Cai, Xianlei, Zhu, Guangwei, Zhang, Yunlin, Gong, Zhijun, Tang, Xiangming
Source:
Journal of Great Lakes research 2016 v.42 no.2 pp. 455-463
ISSN:
0380-1330
Subject:
Microcystis, biogeochemical cycles, carbon, image analysis, lakes, microscopy, nitrogen, particle size, spring, surface area, China
Abstract:
Abundance, characteristics, and size spectra of transparent exopolymer particles (TEP) and Coomassie stainable particles (CSP) were investigated in Lake Taihu for the first time during spring. Abundance, equivalent spherical volume (ESV), and equivalent surface area (ESA) of particles were quantified by combining microscopic observation with image analysis. Average concentration of TEP in water was approximately seven-fold higher than that of CSP, and the average ESV and ESA of TEP were both greater than those of CSP. TEP abundance ranged from 5.27×10³ to 2.3×10⁴ particles/mL, with ESV from 1.09×10⁶ to 7.44×10⁶μm³/mL and ESA from 3.28×10⁶ to 2.23×10⁷μm²/mL. CSP abundance varied from 2.43×10² to 3.81×10³ particles/mL, with ESV from 1.62×10⁴ to 7.12×10⁵μm³/mL and ESA from 4.85×10⁴ to 2.14×10⁶μm²/mL. During spring, small particles (equivalent spherical diameter (ESD)<20μm) were dominant. The size distributions of TEP and CSP in the entire lake followed a power law, with abundance of particle scaling with particle diameter. The size spectra of TEPwere also higher than that of CSP in the lake. The high abundance of TEP and CSP during spring in Lake Taihu signified not only that they could play a critical and dynamic role in nutrient cycling in this lake ecosystembut also that they are part of carbon and nitrogen storage in spring when Microcystis begins to bloom, and they could be especially important for influencing bloom outbreaks.
Agid:
6079859