Drought-induced water-level reduction favors cyanobacteria blooms in tropical shallow lakes

Brasil, Jandeson; Attayde, José Luiz; Vasconcelos, Francisco; Dantas, Danyhelton D. F.; Huszar, Vera L. M.

doi:10.1007/s10750-015-2578-5

Cited by 146 publications

(126 citation statements)

References 79 publications

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“…The cluster analysis also revealed a high similarity between the phytoplankton composition in phases I and III, which reinforces the influence of climatic seasonality to drive the temporal dynamic of this community. In fact, the development of phytoplankton community in Northeast of Brazil is strongly structured by the seasonal climate (rainy/dry periods) (Chellappa et al, 2009;Brasil et al, 2016).…”

Section: Discussionmentioning

confidence: 99%

“…On the other hand, since the reduction of water volume occurs along with intensification in sediment resuspension and turbidity, a negative impact on phytoplankton biomass could also be expected (Braga et al, 2015). Additionally, the dominance of few species, with particular concern for the dominance of potentially harmful cyanobacteria, often occurs in semi-arid regions under drought conditions (Bouvy et al, 1999;Brasil et al, 2016). The phytoplankton classification into functional groups rather than only based on taxonomic affiliations has been often used as tool for environmental characterization of reservoirs (Silva et al, 2015;Rangel et al, 2016;Rodrigues et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

“…In this way, Reynolds et al (2002) FG selection was the better adapted to our goal and the data set (species densities and total phytoplankton biomass), available for our studied reservoir. Other particular characteristic of Reynolds's functional scheme is that it requires the identification at the species level and sometimes genus level, an important information for characterizing water supply in reservoirs where potentially harmful cyanobacteria often occurs (Brasil et al, 2016). Additionally, Reynolds's FGs were previously used by Molisani et al (2010) in the same studied reservoir, allowing a comparative approach.…”

Section: Introductionmentioning

confidence: 99%

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Assessing temporal and spatial variability of phytoplankton composition in a large reservoir in the Brazilian northeastern region under intense drought conditions

et al. 2017

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The present study was carried out in Castanhão Reservoir, a large aquatic system in the Brazilian semi-arid region that serves multiples uses as water drinking supply and intensive fish-cage aquaculture site. In order to understand the effects of environmental conditions on the spatial and temporal variability of the phytoplankton functional groups (FG) and the main 'characterizing taxa', sub-superficial water samples were collected from March 2012 to August 2013, a period distinguished by the continuous drop in reservoir volume due to rainfall shortage. Eighteen functional groups and 102 total phytoplankton taxa were found in the Castanhão reservoir during the study. No significant differences were observed relative to spatial variation of total phytoplankton composition throughout the reservoir (PERMANOVA, P>0.05). On the other hand, according to cluster analysis results, three temporal phases have been identified (Similarity Profile, P<0.05), based on 102 phytoplankton taxa. The 'characterizing taxa' was found using the Similarity Percentage procedure (cut-off 90%), being thus defined as those taxa that contributed the most to the similarity within each temporal phase. Nineteen 'characterizing taxa' described the Castanhão reservoir, with predominance of those typical of mixing and turbidity conditions. Cyanobacteria dominated through the three temporal phases. According to the redundancy analysis, nutrient availability and water transparency were found to influence the phytoplankton temporal dynamics. The phase I (rainy season) was most represented by Planktolyngbya minor/Pl. limnetica (FG=S1), which reached best performance under strongly decreased phosphate-P concentrations and low water transparency. In phase II (dry season), Pseudanabaena sp.1 (FG=?) outcompeted other cyanobacteria probably due the increase in water transparency and decrease in ammonium-N. Finally, in phase III (rainy season) the decrease of water transparency triggered a recovery of shade-adapted cyanobacteria, but at this time mostly represented by Pseudanabaena limnetica (FG=S1). Phase III was also distinctive from the other ones by the highest Nitrate-N and phosphate-P concentrations related to thermocline disruption, which favored an increase in total phytoplankton biomass recorded by the augment of green algae density (FGs=X1, J and F). We concluded that the temporal dynamics of phytoplankton composition was associated to environmental changes in Castanhão Reservoir from 2012 to 2013, which were driven by seasonal climate variation from region (rainy/dry seasons), as well as, by the reduction in reservoir volume that resulted in the disruption of the thermocline, water mixing and an increase in inorganic P and N.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Assessing temporal and spatial variability of phytoplankton composition in a large reservoir in the Brazilian northeastern region under intense drought conditions

et al. 2017

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“…Extreme climatic events are already being observed in Northeast Brazil, causing changes in the phytoplankton community, especially in the dominance of cyanobacteria (e.g., Lira et al, 2014;Câmara et al, 2015;Brasil et al, 2016;Costa et al, 2016). Bouvy et al (2000) made one of the most important reports on cyanoHABs (in almost 40 reservoirs in the Northeast) associated with climate change, when the severe drought of 1998 (a consequence of the El Niño in 1997) made the environment favourable for cyanobacteria proliferation, specially Cylindrospermopsis raciborskii.…”

Section: Discussionmentioning

confidence: 99%

“…In Northeast Brazil, which is characterized by a semiarid climate, the cyanoHABs are more pronounced (e.g., Bittencourt-Oliveira et al, 2014;Lopes et al, 2015;Brasil et al, 2016;Lins et al, 2016) and favour water scarcity, high temperatures, elevated water residence time, and artificial eutrophication. The recurrence of cyanoHABs became a public health problem due to toxins produced by these organisms.…”

Section: Introductionmentioning

confidence: 99%

Cyanobacterial blooms in freshwaters bodies in a semiarid region, northeastern Brazil: A review

2017

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Harmful cyanobacterial blooms have caused several problems in freshwater environments due to their prolific growth and the harmful cyanotoxins produced by some species. The occurrence of these organisms has increased in recent decades due to climate change and eutrophication, although most studies are from temperate regions in the Northern hemisphere. This review presents data about cyanobacteria occurrence, dominance, and toxicity events in freshwater bodies in a semiarid region of Northeast Brazil, in the tropical Southern hemisphere. We performed a literature survey of cyanobacteria publications from 1930 to 2016. We made a list of all the dominant species registered in each state, noted their distribution and occurrence of dominance events involving one or more species, and the registered records of toxic blooms, including information about the toxins involved and the range of values. We selected 102 publications that described cyanobacteria Accepted Article www.jlimnol.it occurrence from states in Northeast Brazil; these publications included relevant contributions regarding cyanobacteria distribution, richness, density, and biomass. Forty-nine dominant species were recorded, with the most representation found in the state of Pernambuco (30 spp.). The genera with the highest occurrences were Microcystis, Cylindrospermopsis, Planktothrix, Dolichospermum (=Anabaena), and Geitlerinema, especially the species Cylindrospermopsis raciborskii, Microcystis aeruginosa, and Planktothrix agardhii. Episodes of toxic blooms were observed in four states. Microcystins, cylindrospermopsin, saxitoxins, and anatoxin-a(S) were found to be associated with these blooms. In Northeast Brazil, harmful cyanobacterial blooms are common in urban and public reservoirs. However, in recent years, cyanobacterial blooms in this region have been more intense and perennial, with high biomass occurring throughout the year.

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Nitrogen is unlikely to consistently limit primary productivity in most tropical lakes

Fadum

Hall

2023

Ecosphere

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Despite mounting evidence that tropical lakes may experience an array of phytoplankton nutrient limitation regimes, references to low‐latitude lakes being predominantly nitrogen limited remain common in the literature. To assess the current understanding of nutrient limitation regimes in tropical lakes, we performed a literature review with the following objectives: First, quantify and summarize observations of nitrogen (N), phosphorus (P), and colimitation in the collected studies. Second, identify common drivers of tropical nutrient limitation regimes. Third, provide literature‐informed recommendations for future research efforts into nutrient limitation of tropical lakes. We report that not only is N not the dominant limiting nutrient in the reviewed lakes, but tropical lakes exhibit a wide range of nutrient limitation regimes, and there is often considerable heterogeneity of the dominant limiting nutrient within an individual lake. This heterogeneity is driven largely by seasonal patterns of water column stratification and precipitation, land use and land cover (LULC), and the interaction of these system characteristics with lake morphology. To accurately characterize nutrient limitation in tropical aquatic ecosystems, assessments need to include sampling across space and time in order to capture within‐lake spatial heterogeneity and both inter‐ and intra‐annual temporal variation. Whenever possible, both inferential and experimental approaches should be used in concert to determine nutrient limitation due to methodological limitations.

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Drought-induced water-level reduction favors cyanobacteria blooms in tropical shallow lakes

Cited by 146 publications

References 79 publications

Assessing temporal and spatial variability of phytoplankton composition in a large reservoir in the Brazilian northeastern region under intense drought conditions

Assessing temporal and spatial variability of phytoplankton composition in a large reservoir in the Brazilian northeastern region under intense drought conditions

Cyanobacterial blooms in freshwaters bodies in a semiarid region, northeastern Brazil: A review

Nitrogen is unlikely to consistently limit primary productivity in most tropical lakes

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