Internal loop sustains cyanobacterial blooms in eutrophic lakes: Evidence from organic nitrogen and ammonium regeneration

	Internal loop sustains cyanobacterial blooms in eutrophic lakes: Evidence from organic nitrogen and ammonium regeneration
	Xue, Jingya; Yao, Xiaolong; Zhao, Zhonghua; He, Chen; Shi, Quan; Zhang, Lu
刊名	WATER RESEARCH
	2021
卷号	206
英文摘要	Algal bloom species can live upon internal regenerated ammonium (NH4+) for growth during the nitrogenlimited period. However, the linkages between NH4+ regeneration and phytoplankton biomass and community composition dynamics remain largely unknown. To unravel the interactions between NH4+ regeneration and phytoplankton community, we measured water column NH4+ regeneration rates (REGs) during a continuous phytoplankton growing period and a contrast summer/winter turnover in eutrophic Lake Taihu. Measured REGs were higher in summer than in winter and significantly correlated to total phytoplankton biomass, Cyanophyta biomass and its biomass proportions, and the concentrations of particulate nitrogen and dissolved organic carbon as well as the relative abundance of labile components (proteins and lipids). Random forest regression analyses displayed that variation of REGs were mainly controlled by water temperature and algal-related parameters (including chlorophyll a, total phytoplankton biomass, and Cyanophyta biomass). Partial least squares path model further revealed that algal-related parameters were the direct and significant factors regulating REGs, and contributed to the largest effect of the variance in REGs. Of the algal community, Cyanophyta was the dominant phylum to accelerate REGs. Correspondingly, rapid internal NH4+ turnover may strongly support the persistence of cyanobacterial blooms, thus forming a positive feedback between cyanobacterial blooms and REGs during the nitrogen-limited summer months. We therefore deduced that the internal loop between cyanobacterial blooms and REGs during summer may be a key self-maintenance mechanism of continuous cyanobacterial blooms.
内容类型	期刊论文
源URL	[http://159.226.73.51/handle/332005/20358]
专题	中国科学院南京地理与湖泊研究所
推荐引用方式 GB/T 7714	Xue, Jingya,Yao, Xiaolong,Zhao, Zhonghua,et al. Internal loop sustains cyanobacterial blooms in eutrophic lakes: Evidence from organic nitrogen and ammonium regeneration[J]. WATER RESEARCH,2021,206.
APA	Xue, Jingya,Yao, Xiaolong,Zhao, Zhonghua,He, Chen,Shi, Quan,&Zhang, Lu.(2021).Internal loop sustains cyanobacterial blooms in eutrophic lakes: Evidence from organic nitrogen and ammonium regeneration.WATER RESEARCH,206.
MLA	Xue, Jingya,et al."Internal loop sustains cyanobacterial blooms in eutrophic lakes: Evidence from organic nitrogen and ammonium regeneration".WATER RESEARCH 206(2021).