Organic and inorganic nitrogen utilization by nitrogen-stressed cyanobacteria during bloom conditions

Chaffin, Justin D.; Bridgeman, Thomas B.

doi:10.1007/s10811-013-0118-0

Cited by 108 publications

(71 citation statements)

References 45 publications

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“…Given that Planktothrix is an effective competitor for DIN (Conroy et al, 2007) (Chaffin and Bridgeman, 2014;Donald et al, 2011Donald et al, , 2013Davis et al, 2015) or sediment regeneration (Paerl et al, 2011;McCarthy et al, 2016) could help to support the persistence of Planktothrix blooms in the late summer. Uptake rates were proportional to the respective concentrations of substrates, suggesting that although NH + 4 is a less energetically costly source of N, NO − 3 is utilized by phytoplankton to a greater extent in this system owing to a greater relative abundance.…”

Section: Phytoplankton N Acquisitionmentioning

confidence: 99%

“…Sandusky Bay experiences large fluctuations in NO − 3 concentrations and dissolved N : P ratios throughout the summer (Davis et al, 2015;Conroy et al, 2017), suggesting that the dynamic N cycling may influence cHAB formation in this system. Indeed, the growth of Planktothrix in Sandusky Bay is stimulated by additions of NO − 3 , NH + 4 , and urea, indicating that phytoplankton growth is seasonally limited or colimited by N (Chaffin and Bridgeman, 2014;Davis et al, 2015). Evaluating the mechanisms that promote the persistence of Planktothrix in this system will benefit from an examination of N removal processes and inputs from N fixation that directly influence the availability of DIN.…”

Section: Introductionmentioning

confidence: 99%

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Nitrogen cycling in Sandusky Bay, Lake Erie: oscillations between strong and weak export and implications for harmful algal blooms

Salk¹,

Bullerjahn²,

McKay³

et al. 2018

Biogeosciences

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Abstract. Recent global water quality crises point to an urgent need for greater understanding of cyanobacterial harmful algal blooms (cHABs) and their drivers. Nearshore areas of Lake Erie such as Sandusky Bay may become seasonally limited by nitrogen (N) and are characterized by distinct cHAB compositions (i.e., Planktothrix over Microcystis). This study investigated phytoplankton N uptake pathways, determined drivers of N depletion, and characterized the N budget in Sandusky Bay. Nitrate (NO − 3 ) and ammonium (NH + 4 ) uptake, N fixation, and N removal processes were quantified by stable isotopic approaches. Dissimilatory N reduction was a relatively modest N sink, with denitrification, anammox, and N 2 O production accounting for 84, 14, and 2 % of sediment N removal, respectively. Phytoplankton assimilation was the dominant N uptake mechanism, and NO − 3 uptake rates were higher than NH + 4 uptake rates. Riverine N loading was sometimes insufficient to meet assimilatory and dissimilatory demands, but N fixation alleviated this deficit. N fixation made up 23.7-85.4 % of total phytoplankton N acquisition and indirectly supports Planktothrix blooms. However, N fixation rates were surprisingly uncorrelated with NO − 3 or NH + 4 concentrations. Owing to temporal separation in sources and sinks of N to Lake Erie, Sandusky Bay oscillates between a conduit and a filter of downstream N loading to Lake Erie, delivering extensively recycled forms of N during periods of low export. Drowned river mouths such as Sandusky Bay are mediators of downstream N loading, but climate-change-induced increases in precipitation and N loading will likely intensify N export from these systems.

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Section: Phytoplankton N Acquisitionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Nitrogen cycling in Sandusky Bay, Lake Erie: oscillations between strong and weak export and implications for harmful algal blooms

Salk¹,

Bullerjahn²,

McKay³

et al. 2018

Biogeosciences

Self Cite

View full text Add to dashboard Cite

show abstract

“…-, NH4 + , and urea, indicating that phytoplankton growth is seasonally limited or co-limited by N (Chaffin and Bridgeman, 2014;Davis et al, 2015). Evaluating the mechanisms that promote the persistence of Planktothrix in this system will benefit from an examination of N removal processes and inputs from N fixation that directly influence the availability of DIN.…”

Section: No3mentioning

confidence: 99%

“…Indeed, NO3 -and NH4 + uptake were active throughout the summer, demonstrating that low concentrations do not equate to the absence of an actively cycling DIN pool. Transient pools of NH4 + generated via water column recycling (Chaffin and Bridgeman, 2014;Donald et al, 2011;Davis et al, 2015) or sediment regeneration (Paerl et al, 2011;McCarthy et al, 2016) could help to support persistence of Planktothrix blooms in the late summer. 15…”

Section: Phytoplankton N Acquisitionmentioning

confidence: 99%

The nitrogen pendulum in Sandusky Bay, Lake Erie: Oscillations between strong and weak export and implications for harmful algal blooms

Salk¹,

Bullerjahn²,

McKay³

et al. 2018

Preprint

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Abstract.Recent global water quality crises point to an urgent need for greater understanding of cyanobacterial harmful algal blooms (cHABs) and their drivers. Nearshore areas of Lake Erie such as Sandusky Bay may become seasonally limited by nitrogen (N) and are characterized by distinct cHAB compositions (i.e., Planktothrix over Microcystis). This study investigated phytoplankton N uptake pathways, determined drivers of N depletion, and characterized the N budget in Sandusky Bay. Nitrate (NO3 -) and ammonium (NH4 + ) uptake, N fixation, and N removal processes were quantified by stable 15 isotopic approaches. Dissimilatory N uptake was a relatively modest N sink, with denitrification, anammox, and N2O production accounting for 84, 14, and 2 % of N removal, respectively. Phytoplankton assimilation was the dominant N uptake mechanism, and NO3 -uptake rates were higher than NH4 + uptake rates. Riverine DIN loading was sometimes insufficient to meet assimilatory and dissimilatory demands, but N fixation alleviated this deficit. N fixation made up 23.7-85.4 % of total phytoplankton N acquisition and indirectly supports Planktothrix blooms. However, N fixation rates were 20 surprisingly uncorrelated with NO3 -or NH4 + concentrations. Owing to temporal separation in sources and sinks of N to Lake Erie, Sandusky Bay pendulums between acting as a strong and weak source of downstream N loading to Lake Erie.Estuarine systems such as Sandusky Bay are mediators of downstream N loading, but climate change-induced increases in precipitation and N loading will likely intensify the swings of the N pendulum in favor of N export.

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“…A range of environmental factors, including nitrogen and phosphorus concentrations (Schindler, 2012;Srivastava et al, 2012;Chaffin and Bridgeman, 2014; Van de Waal et al, 2014), TN : TP ratio (Smith, 1983;Wang et al, 2010b; Van de Waal et al, 2014), temperature (Davis et al, 2009;Rolland et al, 2013), salinity (Tonk et al, 2007), and iron concentration (Ame and Wunderlin, 2005;Nagai et al, 2007;Wang et al, 2010a) have been shown to have pronounced effects on cyanobacterial biomass, cyanobacterial dominance and microcystin production. Nevertheless, the results between studies differ, and there is no clear understanding of the roles of these environmental factors as the triggers of cyanobacterial bloom development and microcystin production.…”

Section: S C Sinang Et Al: Site-specific Environmental Triggers Ofmentioning

confidence: 99%

Local nutrient regimes determine site-specific environmental triggers of cyanobacterial and microcystin variability in urban lakes

Sinang

Reichwaldt

Ghadouani

2015

Hydrol. Earth Syst. Sci.

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Abstract. Toxic cyanobacterial blooms in urban lakes present serious health hazards to humans and animals and require effective management strategies. Managing such blooms requires a sufficient understanding of the controlling environmental factors. A range of them has been proposed in the literature as potential triggers for cyanobacterial biomass development and cyanotoxin (e.g. microcystin) production in freshwater systems. However, the environmental triggers of cyanobacteria and microcystin variability remain a subject of debate due to contrasting findings. This issue has raised the question of whether the relevance of environmental triggers may depend on site-specific combinations of environmental factors. In this study, we investigated the site-specificity of environmental triggers for cyanobacterial bloom and microcystin dynamics in three urban lakes in Western Australia. Our study suggests that cyanobacterial biomass, cyanobacterial dominance and cyanobacterial microcystin content variability were significantly correlated to phosphorus and iron concentrations. However, the correlations were different between lakes, thus suggesting a sitespecific effect of these environmental factors. The discrepancies in the correlations could be explained by differences in local nutrient concentration. For instance, we found no correlation between cyanobacterial fraction and total phosphorous (TP) in the lake with the highest TP concentration, while correlations were significant and negative in the other two lakes. In addition, our study indicates that the difference of the correlation between total iron (TFe) and the cyanobacterial fraction between lakes might have been a consequence of differences in the cyanobacterial community structure, specifically the presence or absence of nitrogen-fixing species. In conclusion, our study suggests that identification of significant environmental factors under site-specific conditions is an important strategy to enhance successful outcomes in cyanobacterial bloom control measures.

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Organic and inorganic nitrogen utilization by nitrogen-stressed cyanobacteria during bloom conditions

Cited by 108 publications

References 45 publications

Nitrogen cycling in Sandusky Bay, Lake Erie: oscillations between strong and weak export and implications for harmful algal blooms

Nitrogen cycling in Sandusky Bay, Lake Erie: oscillations between strong and weak export and implications for harmful algal blooms

The nitrogen pendulum in Sandusky Bay, Lake Erie: Oscillations between strong and weak export and implications for harmful algal blooms

Local nutrient regimes determine site-specific environmental triggers of cyanobacterial and microcystin variability in urban lakes

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