Relationship Between Labile Dissolved Organic Carbon (LDOC), Bacterioplankton Cell Phosphorus Quota, and Bacterial Phosphate Uptake Rate in Lakes

Gao, Xueqing; Heath, Robert W.

doi:10.1016/s0380-1330(05)70309-9

Cited by 4 publications

(3 citation statements)

References 41 publications

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“…Examining the phylogenetic distribution of nifH reads revealed that both heterocystous Cyanobacteria and heterotrophic Proteobacteria exhibited the genetic potential to fix nitrogen. Since Sandusky Bay is a eutrophic system with abundant organic carbon, relationships between heterotrophic bacteria capable of fixing nitrogen (free-living and epiphytic) and nondiazotrophic cyanobacteria cannot be overlooked , which may lead to more effective “phycosphere” N and P recycling. These relationships have never been explored for Planktothrix spp.…”

Section: Discussionmentioning

confidence: 99%

“…The results of this study combined with the aforementioned studies, and other laboratory, , microcosm, , mesocosm − and whole lake , studies strengthen the argument that in certain systems, N management is equally as important as P management for the reduction of bloom biomass and toxicity. Furthermore, Sandusky Bay must have strong N-sinks such as assimilatory N-reduction and dissimilatory sediment N-reduction given the high organic carbon inputs, but to our knowledge no study has investigated these processes in Sandusky Bay and management efforts would certainly need to consider these processes.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Effects of Increasing Nitrogen and Phosphorus Concentrations on Phytoplankton Community Growth and Toxicity During Planktothrix Blooms in Sandusky Bay, Lake Erie

Davis

Bullerjahn

Tuttle

et al. 2015

Environ. Sci. Technol.

179

122

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Sandusky Bay experiences annual toxic cyanobacterial blooms dominated by Planktothrix agardhii/suspensa. To further understand the environmental drivers of these events, we evaluated changes in the growth response and toxicity of the Planktothrix-dominated blooms to nutrient amendments with orthophosphate (PO4) and inorganic and organic forms of dissolved nitrogen (N; ammonium (NH4), nitrate (NO3) and urea) over the bloom season (June - October). We complemented these with a metagenomic analysis of the planktonic microbial community. Our results showed that bloom growth and microcystin (MC) concentrations responded more frequently to additions of dissolved N than PO4, and that the dual addition of NH4 + PO4 and Urea + PO4 yielded the highest MC concentrations in 54% of experiments. Metagenomic analysis confirmed that P. agardhii/suspensa was the primary MC producer. The phylogenetic distribution of nifH revealed that both heterocystous cyanobacteria and heterotrophic proteobacteria had the genetic potential for N2 fixation in Sandusky Bay. These results suggest that as best management practices are developed for P reductions in Sandusky Bay, managers must be aware of the negative implications of not managing N loading into this system as N may significantly impact cyanobacterial bloom size and toxicity.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Effects of Increasing Nitrogen and Phosphorus Concentrations on Phytoplankton Community Growth and Toxicity During Planktothrix Blooms in Sandusky Bay, Lake Erie

Davis

Bullerjahn

Tuttle

et al. 2015

Environ. Sci. Technol.

179

122

View full text Add to dashboard Cite

show abstract

“…Significantly positive linear relationships between free-living bacterial abundance and protein-like C1 fluorescence were also found in the algal-derived filtrate group ( R 2 = 0.78, p < 0.001) and algal residual exudative organic matter group ( R 2 = 0.59, p < 0.01) throughout the entire experimental period. This indicated that labile algal-derived filtrate or algal residual exudative organic matter derived from algal degradation became an important factor in controlling bacterial abundance, which would play an important role in microbial food webs and carbon cycling during the decay of algal blooms through the bacterial enzymolysis mechanism [ 69 ]. At the final stable phase of the two groups (algal-derived filtrate group, day 20–80; algal residual exudative organic matter group, day 31–80), the humic-like C2 component accumulated with the decrease in free-living bacterial abundance, and free-living bacterial abundance showed a significant negative linear relationship with humic-like C2 fluorescence (algal-derived filtrate group, R 2 = 0.63, p < 0.05; algal residual exudative organic matter group, R 2 = 0.96, p < 0.01).…”

Section: Resultsmentioning

confidence: 99%

New Insights into Microbial Degradation of Cyanobacterial Organic Matter Using a Fractionation Procedure

Chen

Zhou

Zhang

2022

IJERPH

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Cyanobacterial blooms caused by phytoplankton Microcystis have occurred successively since 1980 in Lake Taihu, China, which has led to difficulty collecting clean drinking water. The effects of cyanobacterial scum-derived dissolved organic matter (DOM) on microbial population variations and of algal-derived filtrate and algal residual exudative organic matter caused by the fraction procedure on nutrient mineralization are unclear. This study revealed the microbial-regulated transformation of DOM from a high-molecular-weight labile to a low-molecular-weight recalcitrant, which was characterized by three obvious stages. The bioavailability of DOM derived from cyanobacterial scum by lake microbes was investigated during 80-d dark degradation. Carbon substrates provided distinct growth strategy links to the free-living bacteria abundance variation, and this process was coupled with the regeneration of different forms of inorganic nutrients. The carryover effects of Microcystis cyanobacteria blooms can exist for a long time. We also found the transformation of different biological availability of DOM derived from two different cyanobacterial DOM fractions, which all coupled with the regeneration of different forms of inorganic nutrients. Our study provides new insights into the microbial degradation of cyanobacterial organic matter using a fractionation procedure, which suggests that the exudate and lysate from degradation products of cyanobacteria biomass have heterogeneous impacts on DOM cycling in aquatic environments.

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Comparing Alkaline Phosphatase PhoX-Encoding Genes in Two Contrasting Habitats of the Large Eutrophic Lake Taihu, China

Dai

Gao

et al. 2018

Geomicrobiology Journal

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Relationship Between Labile Dissolved Organic Carbon (LDOC), Bacterioplankton Cell Phosphorus Quota, and Bacterial Phosphate Uptake Rate in Lakes

Cited by 4 publications

References 41 publications

Effects of Increasing Nitrogen and Phosphorus Concentrations on Phytoplankton Community Growth and Toxicity During Planktothrix Blooms in Sandusky Bay, Lake Erie

Effects of Increasing Nitrogen and Phosphorus Concentrations on Phytoplankton Community Growth and Toxicity During Planktothrix Blooms in Sandusky Bay, Lake Erie

New Insights into Microbial Degradation of Cyanobacterial Organic Matter Using a Fractionation Procedure

Comparing Alkaline Phosphatase PhoX-Encoding Genes in Two Contrasting Habitats of the Large Eutrophic Lake Taihu, China

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