Response of bacterial communities to cyanobacterial harmful algal blooms in Lake Taihu, China

Harmful Algae ◽  
2017 ◽  
Vol 68 ◽  
pp. 168-177 ◽  
Author(s):  
Xiaomei Su ◽  
Alan D. Steinman ◽  
Xiangming Tang ◽  
Qingju Xue ◽  
Yanyan Zhao ◽  
...  
Keyword(s):  
Bacterial Communities ◽  
Harmful Algal Blooms ◽  
Algal Blooms ◽  
Lake Taihu ◽  
Cyanobacterial Harmful Algal Blooms

scholarly journals Cyanopeptides Restriction and Degradation Co-mediate Microbiota Assembly During a Freshwater Cyanobacterial Harmful Algal Bloom (CyanoHAB)

2022 ◽  
Author(s):  
Han Gao ◽  
Ze Zhao ◽  
Lu Zhang ◽  
Feng Ju
Keyword(s):  
Community Assembly ◽  
Harmful Algal Blooms ◽  
Algal Blooms ◽  
Algal Bloom ◽  
Lake Taihu ◽  
Harmful Algal Bloom ◽  
Size Fraction ◽  
Freshwater Ecosystems ◽  
Cyanobacterial Harmful Algal Blooms ◽  
Microbiota Diversity

Cyanobacterial harmful algal blooms (CyanoHABs) are globally intensifying and exacerbated by climate change and eutrophication. However, microbiota assembly mechanisms underlying CyanoHABs remain scenario specific and elusive. Especially, cyanopeptides, as a group of bioactive secondary metabolites of cyanobacteria, could affect microbiota assembly and ecosystem function. Here, the trajectory of cyanopeptides were followed and linked to microbiota during Microcystis-dominated CyanoHABs in lake Taihu, China. The most abundant cyanopeptide classes detected included microginin, spumigin, microcystin, nodularin and cyanopeptolin with total MC-LR-equivalent concentrations between 0.23 and 2051.54 ppb, of which cyanotoxins beyond microcystins (e.g., cyanostatin B and nodularin_R etc.) far exceeded reported organismal IC50 and negatively correlated with microbiota diversity, exerting potential collective eco-toxicities stronger than microcystins alone. The microbial communities were differentiated by size fraction and sampling date throughout CyanoHABs, and surprisingly, their variances were better explained by cyanopeptides (19-38%) than nutrients (0-16%). Cyanopeptides restriction (e.g., inhibition) and degradation are first quantitatively verified as the deterministic drivers governing community assembly, with stochastic processes being mediated by interplay between cyanopeptide dynamics and lake microbiota. This study presents an emerging paradigm in which cyanopeptides restriction and degradation co-mediate lake water microbiota assembly, unveiling new insights about the ecotoxicological significance of CyanoHABs to freshwater ecosystems.

scholarly journals Cyanobacterial harmful algal blooms are a biological disturbance to Western Lake Erie bacterial communities

2017 ◽  
Vol 19 (3) ◽  
pp. 1149-1162 ◽  
Author(s):  
Michelle A. Berry ◽  
Timothy W. Davis ◽  
Rose M. Cory ◽  
Melissa B. Duhaime ◽  
Thomas H. Johengen ◽  
...  
Keyword(s):  
Bacterial Communities ◽  
Harmful Algal Blooms ◽  
Algal Blooms ◽  
Lake Erie ◽  
Western Lake ◽  
Cyanobacterial Harmful Algal Blooms ◽  
Western Lake Erie

scholarly journals Nitrification and ammonium dynamics in Lake Taihu, China: seasonal competition for ammonium between nitrifiers and cyanobacteria

2017 ◽  
Author(s):  
Justyna J. Hampel ◽  
Mark J. McCarthy ◽  
Wayne S. Gardner ◽  
Lu Zhang ◽  
Hai Xu ◽  
...  
Keyword(s):  
Harmful Algal Blooms ◽  
Algal Blooms ◽  
Lake Taihu ◽  
Oxidation Rates ◽  
Ammonia Oxidizing Archaea ◽  
Uptake Rates ◽  
Anthropogenic Nitrogen ◽  
Meiliang Bay ◽  
Cyanobacterial Harmful Algal Blooms ◽  
No2 Oxidation

Abstract. Taihu Lake is hypereutrophic and experiences seasonal, cyanobacterial harmful algal blooms. These Microcystis blooms produce microcystin, a potent liver toxin, and are linked to anthropogenic nitrogen (N) and phosphorus (P) loads to lakes. Microcystis spp. cannot fix atmospheric N and must compete with ammonia-oxidizing and other organisms for ammonium (NH4+). We measured NH4+ regeneration and potential uptake rates and total nitrification using stable isotope techniques. Nitrification studies included separate NH4+ and nitrite (NO2−) oxidation rates and abundance of the functional gene for NH4+ oxidation, amoA, for ammonia-oxidizing archaea (AOA) and bacteria (AOB). Potential NH4+ uptake rates ranged from 0.02–6.80 µmol L−1 hr−1 in the light and 0.05–3.33 µmol L−1 hr−1 in the dark, and NH4+ regeneration rates ranged from 0.03–2.37 µmol L−1 hr−1. Nitrification rates exceeded previously reported rates in most freshwater systems. Total nitrification often exceeded 200 nmol L−1 d−1 and exceeded 1000 nmol L−1 d−1 at one station near a river discharge. In Meiliang Bay and the open lake, average NO2− oxidation rates (248 ± 39.0 nmol L−1 d−1) exceeded NH4+ oxidation rates (22.0 ± 6.00 nmol L−1 d−1; p 

scholarly journals CyanoTRACKER: A cloud-based integrated multi-platform architecture for global observation of cyanobacterial harmful algal blooms

Harmful Algae ◽  
2020 ◽  
Vol 96 ◽  
pp. 101828 ◽  
Author(s):  
Deepak R. Mishra ◽  
Abhishek Kumar ◽  
Lakshmish Ramaswamy ◽  
Vinay K. Boddula ◽  
Moumita C. Das ◽  
...  
Keyword(s):  
Harmful Algal Blooms ◽  
Algal Blooms ◽  
Platform Architecture ◽  
Cyanobacterial Harmful Algal Blooms

Science meets policy: A framework for determining impairment designation criteria for large waterbodies affected by cyanobacterial harmful algal blooms

Harmful Algae ◽  
2019 ◽  
Vol 81 ◽  
pp. 59-64 ◽  
Author(s):  
Timothy W. Davis ◽  
Richard Stumpf ◽  
George S. Bullerjahn ◽  
Robert Michael L. McKay ◽  
Justin D. Chaffin ◽  
...  
Keyword(s):  
Harmful Algal Blooms ◽  
Algal Blooms ◽  
Cyanobacterial Harmful Algal Blooms
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