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Duelling 'CyanoHABs': unravelling the environmental drivers controlling dominance and succession among diazotrophic and non-N2 -fixing harmful cyanobacteria.
Environ Microbiol. 2016 Feb; 18(2):316-24.EM

Abstract

Eutrophication often manifests itself by increased frequencies and magnitudes of cyanobacterial harmful algal blooms (CyanoHABs) in freshwater systems. It is generally assumed that nitrogen-fixing cyanobacteria will dominate when nitrogen (N) is limiting and non-N2 fixers dominate when N is present in excess. However, this is rarely observed in temperate lakes, where N2 fixers often bloom when N is replete, and non-fixers (e.g. Microcystis) dominate when N concentrations are lowest. This review integrates observations from previous studies with insights into the environmental factors that select for CyanoHAB groups. This information may be used to predict how nutrient reduction strategies targeting N, phosphorus (P) or both N and P may alter cyanobacterial community composition. One underexplored concern is that as N inputs are reduced, CyanoHABs may switch from non-N2 fixing to diazotrophic taxa, with no net improvement in water quality. However, monitoring and experimental observations indicate that in eutrophic systems, minimizing both N and P loading will lead to the most significant reductions in total phytoplankton biomass without this shift occurring, because successional patterns appear to be strongly driven by physical factors, including temperature, irradiance and hydrology. Notably, water temperature is a primary driver of cyanobacterial community succession, with warming favouring non-diazotrophic taxa.

Authors+Show Affiliations

Institute of Marine Sciences, The University of North Carolina at Chapel Hill, Morehead City, NC, 28557, USA.Department of Microbiology, Oregon State University, 226 Nash Hall, Corvallis, OR, 97331, USA.

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.
Review

Language

eng

PubMed ID

26310611

Citation

Paerl, Hans W., and Timothy G. Otten. "Duelling 'CyanoHABs': Unravelling the Environmental Drivers Controlling Dominance and Succession Among Diazotrophic and non-N2 -fixing Harmful Cyanobacteria." Environmental Microbiology, vol. 18, no. 2, 2016, pp. 316-24.
Paerl HW, Otten TG. Duelling 'CyanoHABs': unravelling the environmental drivers controlling dominance and succession among diazotrophic and non-N2 -fixing harmful cyanobacteria. Environ Microbiol. 2016;18(2):316-24.
Paerl, H. W., & Otten, T. G. (2016). Duelling 'CyanoHABs': unravelling the environmental drivers controlling dominance and succession among diazotrophic and non-N2 -fixing harmful cyanobacteria. Environmental Microbiology, 18(2), 316-24. https://doi.org/10.1111/1462-2920.13035
Paerl HW, Otten TG. Duelling 'CyanoHABs': Unravelling the Environmental Drivers Controlling Dominance and Succession Among Diazotrophic and non-N2 -fixing Harmful Cyanobacteria. Environ Microbiol. 2016;18(2):316-24. PubMed PMID: 26310611.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Duelling 'CyanoHABs': unravelling the environmental drivers controlling dominance and succession among diazotrophic and non-N2 -fixing harmful cyanobacteria. AU - Paerl,Hans W, AU - Otten,Timothy G, Y1 - 2015/10/14/ PY - 2015/07/08/received PY - 2015/08/20/accepted PY - 2015/8/28/entrez PY - 2015/8/28/pubmed PY - 2016/11/12/medline SP - 316 EP - 24 JF - Environmental microbiology JO - Environ Microbiol VL - 18 IS - 2 N2 - Eutrophication often manifests itself by increased frequencies and magnitudes of cyanobacterial harmful algal blooms (CyanoHABs) in freshwater systems. It is generally assumed that nitrogen-fixing cyanobacteria will dominate when nitrogen (N) is limiting and non-N2 fixers dominate when N is present in excess. However, this is rarely observed in temperate lakes, where N2 fixers often bloom when N is replete, and non-fixers (e.g. Microcystis) dominate when N concentrations are lowest. This review integrates observations from previous studies with insights into the environmental factors that select for CyanoHAB groups. This information may be used to predict how nutrient reduction strategies targeting N, phosphorus (P) or both N and P may alter cyanobacterial community composition. One underexplored concern is that as N inputs are reduced, CyanoHABs may switch from non-N2 fixing to diazotrophic taxa, with no net improvement in water quality. However, monitoring and experimental observations indicate that in eutrophic systems, minimizing both N and P loading will lead to the most significant reductions in total phytoplankton biomass without this shift occurring, because successional patterns appear to be strongly driven by physical factors, including temperature, irradiance and hydrology. Notably, water temperature is a primary driver of cyanobacterial community succession, with warming favouring non-diazotrophic taxa. SN - 1462-2920 UR - https://www.unboundmedicine.com/medline/citation/26310611/Duelling_'CyanoHABs':_unravelling_the_environmental_drivers_controlling_dominance_and_succession_among_diazotrophic_and_non_N2__fixing_harmful_cyanobacteria_ L2 - https://doi.org/10.1111/1462-2920.13035 DB - PRIME DP - Unbound Medicine ER -