Planktonic nitrogen fixation in Lake Malawi/Nyasa

Gondwe, Mangaliso J.; Guildford, Stephanie J.; Hecky, Robert E.

doi:10.1007/s10750-007-9101-6

Cited by 37 publications

(28 citation statements)

References 41 publications

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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). Some studies documented Microcystis blooms in the wet season due to elevated nutrient levels in the various water bodies, occurring after periods of heavy rainfall (Ochumba and Kibaara, 1989;Makahant et al, 1998;Salonen et al, 1999;Arfi et al, 2001;Kitaka et al, 2002;Wang et al, 2002;Welker et al, 2004;Sekandende et al, 2005;Meesuko et al, 2007;Krishnan, 2008;Onyema 2010;Sitoki et al, 2012).…”

Section: Seasonality In the Tropicsmentioning

confidence: 99%

“…6). Some studies have found that higher temperatures favour Cylindrospermopsis blooms (Bouvy et al, 2000;Huszar et al, 2000;Saker and Griffiths, 2001;Berger et al, 2006;Dufour et al, 2006;Ghosh et al, 2008;Figueredo and Giani, 2009), while high total nitrogen concentration may not be as important for Cylindrospermopsis bloom occurrence, due to the fact that Cylindrospermopsis are nitrogen-fixing (Bouvy et al, 1999;Rustadi et al, 2002;Gondwe et al, 2007;Khuantrairong and Traichaiyaporn, 2008). Comparing this outcome to temperate areas, Cylindrospermopsis blooms in France are similarly affected by high temperature (Briand et al, 2002).…”

Section: Effects Of Nutrients and Temperature On Tropical Bloomsmentioning

confidence: 99%

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

et al. 2014

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Section: Seasonality In the Tropicsmentioning

confidence: 99%

Section: Effects Of Nutrients and Temperature On Tropical Bloomsmentioning

confidence: 99%

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

et al. 2014

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“…Results indicate that almost all nifH gene sequences (except II-1, GU593993) directly cloned from planktonic DNA herein showed high similarity to the cyanobacterial nifH sequences. Also, the heterocysts were detected during microscopic observation of cyanobacterial filaments, indicated a possibility of cyanobacterial N 2 -fixation under the environment (Gondwe et al 2008). This observation suggests that the cyanobacterial taxa detected in our study may also play important roles in N 2 fixation when N is limited or temporarily unavailable.…”

Section: Resultsmentioning

confidence: 99%

Diversity of nifH gene amplified from plankton-community DNA in a shallow eutrophic lake (Lake Donghu, Wuhan, China)

Yan

Feng

2010

Limnology

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Biological nitrogen fixation (BNF) is one of the major nitrogen inputs into the biosphere, and the nitrogenase iron protein (nifH) gene plays important roles in regulating the molecular nitrogen (N 2 ) fixation process. The nifH gene has also been extensively used to study the diversity and function of nitrogen-fixing microorganisms. In this study, we investigated the diversity of the nifH gene by culture-independent methods to analysis the planktonic nitrogen-fixing organisms in Lake Donghu, Wuhan, the largest urban lake in China. Results indicate that nifH gene sequences cloned from planktonic-community DNA showed high similarity to the uncultured cyanobacterial sequences deposited in the GenBank database. Phylogenetic analysis on the basis of the translated amino acid sequences further showed that most nifH clones were closely related to the reported cyanobacterial nifH gene sequences. Results also indicate that there are similar planktonic nitrogen-fixing organisms in the relatively independent areas of Lake Donghu, even though different regions showed a wide gradient in trophic status. These and other observations led us to believe that studies on nifH gene diversity and expression will increase our ability to understand the ecological function of target nitrogen-fixing groups in aquatic ecosystems.

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“…An estimate of the nitrogen contributed to Cusheon Lake from N-fixation using September 2000 heterocyst biomass and a relationship between heterocyst biomass and N-fixation (Gondwe et al 2008) suggests that approximately 60 lg N L -1 month -1 was added. However, total input from N-fixation generally increases with lake trophic level (Howarth et al 1988), so this value may be underestimated since the relationship used (Gondwe et al 2008) was derived from an ultraoligotrophic lake. The heterocyst biomass data, increase in TN and concomitant decrease in d 15 N values during autumn blooms in Cusheon Lake supports that N-fixation was an important source of N during this period.…”

Section: Discussionmentioning

confidence: 99%

Temporal discontinuity of nutrient limitation in plankton communities

2010

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Ideas on how various measures of nutrient limitation relate to plankton biomass and species composition are re-examined. While long-term and multi-lake studies typically focus on determining overall biomass, seasonal studies are more focused toward understanding species composition. We use physiological assays to assess short-term nutrient deficiency of nitrogen and phosphorus in two moderately fertile lakes. While biomass in the lakes was considered to ultimately be limited by total phosphorus, nutrient assays were variable in time. Nutrient ratios (TN:TP, PN:PP, PC:PP and PC:PN) did not predict shortterm deficiencies, notably that nitrogen deficiency occurred in these phosphorus-limited lakes. In one of our study lakes, there was a relaxation of phosphorus deficiency despite phosphate concentrations occurring below traditional detection limits. Following this period, there was an autumn bloom of Aphanizomenon flos-aquae. This relationship corresponds with other studies that have found A. flos-aquae to be a poor competitor for phosphorus. In contrast, phosphorus deficiency remained high prior to the autumn diatom bloom in our other study lake. Deficiency measures remain an excellent means of assessing physiological status of plankton communities and provide greater insight into species compositional changes, especially when other potential indicators like dissolved nutrient concentrations are inconclusive. Regardless of the nutrient limitation indicator used for a given study, it is critical to consider the appropriate scale of the measure.

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Planktonic nitrogen fixation in Lake Malawi/Nyasa

Cited by 37 publications

References 41 publications

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

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

Diversity of nifH gene amplified from plankton-community DNA in a shallow eutrophic lake (Lake Donghu, Wuhan, China)

Temporal discontinuity of nutrient limitation in plankton communities

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