Competition between nitrogen-fixing cyanobacteria during phosphorus-limited growth

Nobel, W.T. de; Mur, Luuc R.; xx, xx

doi:10.2166/wst.1995.0170

Cited by 3 publications

(1 citation statement)

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“…As an N-xing cyanobacteria, Dolichospermum can x N biologically and absorb and store P in replete conditions to overcome N and P limitation. For example, in conditions of P limitation, Dolichospermum has a competitive advantage with a higher maximum growth rate, a greater a nity for P, a higher yield on P and a higher N 2 xation activity than those of Aphanizomenon [13,14]. Additionally, Dolichospermum can increase its N xation capacity to form blooms in the Karori Reservoir [15] and excrete alkaline phosphatase when experiencing P de ciency.…”

Section: Introductionmentioning

confidence: 99%

Community composition and functional genes as well as ecological role of bacteria attached to different bloom-forming cyanobacteria

Song¹,

Liu²,

Cao³

et al. 2020

Preprint

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Background Eutrophication leads to frequent outbreaks of cyanobacterial blooms, especially those of the genera Dolichospermum and Microcystis. The contribution of bacteria attached to algal cells to cyanobacterial blooms is still not clear and specific. To gain a deeper understanding of functional genes and their role in bacteria attached to different bloom-forming cyanobacteria, we carried out microbial experiments associated with Dolichospermum and Microcystis in four fish ponds. Results The significantly positive relationships between Dolichospermum density and total nitrogen (TN) and between Microcystis density and particle nitrogen (PN) indicated the strong nitrogen (N) demand of these two species. The lack of functional genes mediating the nitrification process in bacteria attached to both Microcystis and Dolichospermum indicated that these two species preferred ammonium (NH 4 + -N). Dolichospermum could overcome N limitation through N 2 fixation expressed by high nitrogenase genes abundance. Compared to bacteria attached to Dolichospermum cells, bacteria attached to Microcystis cells showed a higher activity of leucine aminopeptidase (LAP) and a significantly higher abundance of functional genes (such as nrfA , nirB and aminopeptidase genes) mediating the dissimilatory nitrate reduction to ammonium (DNRA). The significantly higher abundance of functional genes (carbon degradation) and β-glucosidase (GLU) activity of bacteria attached to Microcystis than those of bacteria attached to Dolichospermum suggested the abundant organic carbon bound Microcystis cells, which was prerequisite for DNRA. Also, Microcystis had a great advantage in solving phosphorus (P) stress, including high levels of organic phosphorus hydrolysis associated with high levels of phosphatase genes of attached bacteria. The difference of functional community compositions of bacteria attached to Microcystis and Dolichospermum resulted in the functional differentiation. Conclusions Dolichospermum and Microcystis growth was susceptible to P and N (especially NH 4 + -N) limitation, respectively, the latter of which could be effectively solved by attached bacteria through DNRA and ammonification. The P acquisition disadvantage of Dolichospermum resulted in its frequent replacement by Microcystis , especially in conditions of P deficiency. Hence, the evaluation of nutrient limitation (N or P) type of algal growth should combine the nutrient concentration and ratio as well as the ability to solve nutrient deficiency.

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Section: Introductionmentioning

confidence: 99%

Community composition and functional genes as well as ecological role of bacteria attached to different bloom-forming cyanobacteria

Song¹,

Liu²,

Cao³

et al. 2020

Preprint

View full text Add to dashboard Cite

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The influence of water quality variables on cyanobacterial blooms and phytoplankton community composition in a shallow temperate lake

Lee

Rollwagen‐Bollens

Bollens

2015

Environ Monit Assess

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Cyanobacterial blooms and their detrimental effects on water quality have become a worldwide problem. Vancouver Lake, a tidally influenced shallow temperate freshwater lake in Washington state, U.S.A., exhibits annual summer cyanobacterial blooms that are of concern to local resource managers. Our objectives were to describe changes in phytoplankton community composition in Vancouver Lake over seasonal, annual, and interannual time scales, and to identify strong water quality predictors of phytoplankton community structure, with an emphasis on cyanobacterial blooms, from 2007 through 2010. Cluster analysis, indicator species analysis, and non-metric multidimensional scaling were used to identify significantly different phytoplankton community groupings and to determine which environmental factors influenced community changes. From 2007 through 2009, depletion of NO3-N followed by elevated PO4-P concentration was associated with increased biomass and duration of each cyanobacterial bloom. Time-lag analysis suggested that NO3-N availability contributed to interannual changes within the summer phytoplankton community. Specifically, in summer 2010, a distinct cyanobacteria community was not present, potentially due to increased NO3-N and decreased PO4-P and NH4-N availability. Our study provides a comprehensive assessment of species-level responses to water quality variables in a shallow non-stratifying temperate lake, contributes to a better understanding of phytoplankton dynamics, and may aid in predicting and managing cyanobacterial blooms.

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Community composition and functional genes explain different ecological roles of heterotrophic bacteria attached to two bloom-forming cyanobacterial genera

Yang

Cao

Chen

et al. 2021

Science of The Total Environment

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Competition between nitrogen-fixing cyanobacteria during phosphorus-limited growth

Cited by 3 publications

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Community composition and functional genes as well as ecological role of bacteria attached to different bloom-forming cyanobacteria

Community composition and functional genes as well as ecological role of bacteria attached to different bloom-forming cyanobacteria

The influence of water quality variables on cyanobacterial blooms and phytoplankton community composition in a shallow temperate lake

Community composition and functional genes explain different ecological roles of heterotrophic bacteria attached to two bloom-forming cyanobacterial genera

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