Nitrogen uptake and fixation in the cyanobacterium Cylindrospermopsis raciborskii under different nitrogen conditions

Sprőber, Péter; Shafik, Hesham M.; Présing, Mátyås; Kovács, Attila; Herodek, Sándor

doi:10.1023/b:hydr.0000008617.90245.5f

Cited by 61 publications

(50 citation statements)

References 20 publications

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“…While this result is unexpected, previous work has shown that the presence of DIN suppresses the synthesis of the nitrogenase complex but not the activity of the existing enzyme (Fogg, 1971;Wolk, 1973;Chang et al, 1980), and high concentrations of NO − 3 only partially suppress heterocyst formation (Ogawa and Carr, 1969;Ohmori and Hattori, 1972). Indeed, N fixation in the presence of DIN and at dissolved N : P ratios greater than 16 have been observed elsewhere (Chen et al, 1996;Spröber et al, 2003;Voss et al, 2004;Moisander et al, 2008;Gao et al, 2014). Given the dynamic nature of hydrology and riverine DIN loading in river-lake mixing zones and estuarine systems, there may be energetic gains from maintaining N fixation machinery that can be utilized quickly following sudden swings in N availability (Moisander et al, 2012).…”

Section: Phytoplankton N Acquisitionmentioning

confidence: 79%

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: 79%

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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“…Regarding the nitrogen assimilation, some studies have shown C. raciborskii to have preference for ammonia (Sprőber et al, 2003) which is present in the lagoon ( Table 1). The absence of thricomes with two heterocysts (Figure 2.b) matches with the fact that the amount of heterocysts is inversely proportional to the inorganic nitrogen concentration in the media (Bouvyli et al, 1999;Briand et al, 2002).…”

Section: Raciborskii Potential Blooms In Limoncocha Lagoonmentioning

confidence: 99%

Characterization and spatio-temporal dynamics of Cylindrospermopsis raciborski in an Amazonian Lagoon, Ecuador.

Venegas¹,

Pons²,

Chamorro³

et al. 2018

Enfoque UTE

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The cyanobacteria Cylindrospermopsis raciborskii, is a fresh water ubiquitous species from tropical to temperate weather. It is potentially capable of producing toxins. Thus it is necessary to monitor its presence in fresh waters associated to recreational use activities and human consumption. There are official reports and one thesis reporting the presence of C. raciborskii in Ecuador. Nevertheless, this country does not appear in the latest distribution maps of this species in the scientific literature. In this article, we report the presence of C. raciborskii in Ecuador, together with the characterization of the environmental conditions of one of the habitats where this species is present: the Limoncocha lagoon, province of Sucumbíos.

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“…Nitrogen-fixing species were found to be bloom-forming during the dry season, due to strong thermal stratification and water column stability (Sprober et al, 2003). Since nitrogen fixing genera such as Anabaena and Cylindrospermopsis are able to fix atmospheric nitrogen for growth, these genera are able to compete in conditions of lower nitrogen, for example, after a long period of stratification (Khuantrairong et al, 2008;Bormans et al, 2004;Hawkins and Griffiths, 1993;Hawkins, 1985;Saker and Griffith, 2001;Komarek and Kling, 1991;Okechukwu and Ugwumba, 2008;Berger et al, 2006;Dufour et al, 2006;Gondwe et al, 2007;Branco and Senna, 1994;Bouvy et al, 1999;Bouvy et al, 2003;Vieira et al, 2005;Vieira et al, 2003).…”

Section: Seasonality In the Tropicsmentioning

confidence: 99%

Tropical cyanobacterial blooms: a review of prevalence, problem taxa, toxins and influencing environmental factors

et al. 2014

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Nitrogen uptake and fixation in the cyanobacterium Cylindrospermopsis raciborskii under different nitrogen conditions

Cited by 61 publications

References 20 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

Characterization and spatio-temporal dynamics of Cylindrospermopsis raciborski in an Amazonian Lagoon, Ecuador.

Tropical cyanobacterial blooms: a review of prevalence, problem taxa, toxins and influencing environmental factors

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