Science Inventory

Cyanobacterial community succession and associated cyanotoxin production in hypereutrophic and eutrophic freshwaters

Citation:

Ullah Tanvir, R., Z. Hu, Y. Zhang, AND J. Lu. Cyanobacterial community succession and associated cyanotoxin production in hypereutrophic and eutrophic freshwaters. ENVIRONMENTAL POLLUTION. Elsevier Science Ltd, New York, NY, 290:118056, (2021). https://doi.org/10.1016/j.envpol.2021.118056

Impact/Purpose:

The efforts towards reduction of nutrient contamination of surface waters has greatly gained attention to mitigate increasing incidences of harmful cyanobacterial blooms (HABs). Little attention has been paid on the roles and importance of nutrient metabolic pathways within the cyanobacterial communities during HABs. The community successions and their metabolic pathway were revealed and found to be associated with low levels of nitrogen and high level of phosphorus, and with shift of cyanbacterial dominance from nitrogen fixing to bloom-forming populations and production of cyanotoxin. This information can be used to aid in the understanding the impact that TN and TP have on cyanobacterial community successions and cyanotoxin production and aid in making management decisions related to harmful algal blooms. OW, regional offices, scientists and water quality managers could be interested in the results.

Description:

Cyanobacterial harmful algal blooms (cyanoHABs) in freshwater bodies are mainly attributed to excess loading of nutrients [nitrogen (N) and phosphorus (P)]. This study provides a comprehensive review of how the existing nutrient (i.e., N and P) conditions and microbial ecological factors affect cyanobacterial community succession and cyanotoxin production in freshwaters. Different eutrophic scenarios (i.e., hypereutrophic vs. eutrophic conditions) in the presence of (i) high levels of N and P, (ii) a relatively high level of P but a low level of N, and (iii) a relatively high level of N but a low level of P, are discussed in association with cyanobacterial community succession and cyanotoxin production. The seasonal cyanobacterial community succession is mostly regulated by temperature in hypereutrophic freshwaters, where both temperature and nitrogen fixation play a critical role in eutrophic freshwaters. While the early cyanoHAB mitigation strategies focus on reducing P from water bodies, many more studies show that both N and P have a profound contribution to cyanobacterial blooms and toxin production. The availability of N often shapes the structure of the cyanobacterial community (e.g., the relative abundance of N2-fixing and non-N2-fixing cyanobacterial genera) and is positively linked to the levels of microcystin. Ecological aspects of cyanotoxin production and release, related functional genes, and corresponding nutrient and environmental conditions are also elucidated. Research perspectives on cyanoHABs and cyanobacterial community succession are discussed and presented with respect to the following: (i) role of internal nutrients and their species, (ii) P- and N-based control vs. solely P-based control of cyanoHABs, and (iii) molecular investigations and prediction of cyanotoxin production.

Record Details:

Record Type:DOCUMENT( JOURNAL/ PEER REVIEWED JOURNAL)
Product Published Date:12/01/2021
Record Last Revised:09/14/2021
OMB Category:Other
Record ID: 352788