Patterns in phytoplankton taxonomic composition across temperate lakes of differing nutrient status

Watson, Susan B.; McCauley, Edward; Downing, John A.

doi:10.4319/lo.1997.42.3.0487

Cited by 411 publications

(325 citation statements)

References 41 publications

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“…Frequently associated with eutrophic water conditions (Dokulil & Teubner 2000, Huszar et al 2000, the dominance of cyanobacteria can be related to environmental factors such as high total phosphorus (Watson et al 1997), high temperature (Shapiro 1990), high pH (Caraco & Miller 1998), low light (Smith 1986) and low total nitrogen (Smith 1983). Many species are well known producers of toxic compounds (Carmichael 1996, Sant'Anna et al 2004 as well as of substances causing unpleasant taste and odor to drinking water (Persson 1996).…”

Section: Introductionmentioning

confidence: 99%

Planktic Cyanobacteria from upper Tietê basin reservoirs, SP, Brazil

Sant’Anna¹,

Melcher²,

Carvalho³

et al. 2007

Rev. bras. Bot.

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-(Planktic Cyanobacteria from upper Tietê basin reservoirs, SP, Brazil). Considering the great ecological and sanitary importance of the cyanobacteria and the need of detailed information about these organisms in Brazilian water bodies, the present study aims at contributing towards the knowledge of the cyanobacterial flora of five reservoirs belonging to the upper Tietê Basin, São Paulo: Billings, Guarapiranga, Jundiaí, Pirapora, Ponte Nova and Taiaçupeba. In the past several years, these reservoirs have been submitted to severe environmental deterioration and have repeatedly presented cyanobacterial blooms, including those of toxic species. The samples were collected between 1997 and 2003 either with plankton net (20 µm mesh) or van Dorn´s bottle, and preserved with lugol solution or formaldehyde. Some species were isolated and maintained in culture. Forty-eight species of cyanobacteria were identified, with predominance of the order Chroococcales (58%), followed by the orders Oscillatoriales (21%) and Nostocales (21%). Among the 48 studied species, 17 (35%) were considered potentially toxic. The occurrence and biodiversity of the cyanobacteria in each reservoir depend on the environmental conditions. Among the five water bodies, Billings Reservoir presented the most adequate situation for the development of a greater number of species (34), probably due to its high pH values (around 8). Pirapora Reservoir on the other hand, with highest conductivity (445.0 µS cm -1 ) and lowest Secchi depth values (0.2 m), presented the lowest cyanobacterial biodiversity (14 species).Key words -Brazil, diversity, planktic Cyanobacteria, reservoirs RESUMO -(Cianobactérias planctônicas em reservatórios do Alto Tietê, SP, Brasil). Diante da grande importância ecológica e sanitária das cianobactérias e da escassez de informações mais detalhadas sobre estes organismos em corpos d´água doce brasileiros, o presente trabalho pretende estudar a flora de cianobactérias em cinco represas da Bacia Hidrográfica do Alto Tietê, São Paulo. As represas Billings, Guarapiranga, Jundiaí, Pirapora, Ponte Nova e Taiaçupeba vêm sofrendo, nos últimos anos, forte deterioração ambiental e têm apresentado repetidas florações de cianobactérias, inclusive tóxicas. As amostras foram coletadas entre 1997 e 2003 com rede de plâncton (abertura da malha de 20 µm) ou garrafa do tipo van Dorn, e preservadas com lugol ou formalina. Algumas espécies foram isoladas e mantidas em cultura. Foram identificadas 48 espécies de cianobactérias, com predominância da ordem Chroococcales (58%), seguida das ordens Oscillatoriales (21%) e Nostocales (21%). Entre as 48 espécies estudadas, 17 (35%) são consideradas potencialmente tóxicas. A biodiversidade e distribuição das cianobactérias em cada reservatório relacionam-se com as condições ambientais dos mesmos. A Represa Billings mostrou-se o ambiente mais propício ao desenvolvimento de maior número de espécies (34), provavelmente em função de seu pH elevado (em torno de 8). Já o Reservatório de Pirapora, com os valor...

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Section: Introductionmentioning

confidence: 99%

Planktic Cyanobacteria from upper Tietê basin reservoirs, SP, Brazil

Sant’Anna¹,

Melcher²,

Carvalho³

et al. 2007

Rev. bras. Bot.

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“…These blooms are a direct consequence of eutrophication, and are presumed to be primarily associated with waters that are toward the upper reaches of the trophic spectrum (Watson et al 1997). While such blooms are not new, reports of surface scum have become much more numerous since the mid-20th century.…”

Section: Introductionmentioning

confidence: 99%

Changes in species composition during annual cyanobacterial dominance in a tropical reservoir: physical factors, nutrients and grazing effects

Soares¹,

Rocha²,

Marinho³

et al. 2009

Aquat. Microb. Ecol.

109

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Trends in recent years have indicated that cyanobacterial blooms in tropical reservoirs are increasing in frequency, magnitude and geographical distribution. Funil Reservoir in southeastern Brazil has experienced eutrophication in the recent decades, resulting in lasting and intense toxic cyanobacterial blooms. As input of nutrients is high during the year, the aim of the present study was to evaluate the role of other variables related to changes in cyanobacterial biomass and composition. The dominant group found over the entire study period was Cyanobacteria (97% of total biomass), which contributed to low diversity. A shift of nitrogen-fixing (Anabaena circinalis and Cylindrospermopsis raciborskii) and non nitrogen-fixing (Microcystis aeruginosa) cyanobacteria was observed. Redundancy analysis indicated that physical factors such as temperature, changes in the mixing zone and light intensity were the main driving factors of the seasonal succession. Nitrogenfixing cyanobacteria dominated in periods of low light in the deepest mixing zone, and also seemed to have experienced stronger grazing effects as the density of the large zooplankton group was related to cyanobacteria biomass. M. aeruginosa bloomed in warm stratified waters, high water levels and during months with more daylight, when the zooplankton density was drastically reduced. Although the long-standing dominance of cyanobacteria may be related to high nutrient availability, the present study showed that under high and constant input of nutrients, other factors, especially physical variables, present a more plausible explanation to promote changes in species composition.KEY WORDS: Cyanobacterial bloom · Cylindrospermopsis · Microcystis · Anabaena · Zooplankton Resale or republication not permitted without written consent of the publisherAquat Microb Ecol 57: [137][138][139][140][141][142][143][144][145][146][147][148][149] 2009 reports of surface scum have become much more numerous since the mid-20th century. Harmful algal blooms caused by cyanobacteria (CyanoHABs) are one of the most severe problems in freshwater ecosystems nowadays. These often-toxic blooms and the dense surface scums are indicative of water quality deterioration and food-web changes, and can be responsible for the mortality of fish, domestic animals and even humans (Paerl & Huisman 2009).Cyanobacteria blooms occur in waters during calm stratified conditions with high temperatures and adequate nutrient supplies (Huszar et al. 2000). Cyanobacterial dominance is mostly related to favourable bottom-up factors (Briand et al. 2002, Marinho & Huszar 2002, since they are widely known for their ability to minimize grazing pressure, through different effects on zooplankton community: mechanical interference (difficulty in manipulating and ingesting large colonies or filaments), assimilation (low amounts of essential nutrients) and toxicity (De Bernardi & Giussani 1990). However, some zooplankton species have developed physiological resistance to cyanotoxins (Fulton & Paerl 1988...

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“…On the other hand, at the ecoregional scale, the gradient parameter was positively related to the percentage of pasture in an ecoregion, indicating that Chl a tends to respond more rapidly to changes in TP where there are high levels of agricultural pasture than where there is little (Wagner et al, 2011). Contrastingly, in highly eutrophic lakes, the gradient of the total biomass curve decreases, as do all the relative abundances of all groups except bluegreens and diatoms (Watson et al, 1997). In short, influences of phosphorus load on phytoplankton growth potential in relation to its taxonomic composition were inadequately studied in lakes.…”

Section: Introductionmentioning

confidence: 67%

Sediment–water interaction in phosphorus cycling as affected by trophic states in a Chinese shallow lake (Lake Donghu)

Chen

Hou

et al. 2016

Hydrobiologia

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Lake sediment substantially accumulates nutrients, while little is known regarding the conditions under which it tends to be a sink or source of phosphorus. It is postulated that the above functions were largely dependent on trophic state. To test this hypothesis, composition, abundance, and size-spectrum of phytoplankton were studied in a Chinese shallow lake (Lake Donghu), together with concentrations and sorption behaviors of phosphorus in water column and sediment. Relationships among these variables were also examined by structural equation model. In the basins with the lowest phosphorus concentration, sediment was a phosphorus source as judged by equilibrium phosphorus concentration, directly affecting the abundance of phytoplankton with smaller size. Contrastingly, in the basins with the highest phosphorus concentration, sediment tended to uptake phosphorus, companied by the lowest ratio of nitrogen to phosphorus, diversity, and evenness of phytoplankton with the smaller size one dominating. Oscillatoria sp. was directly affected by ammonia and phosphorus. Moreover, with a balanced exchange of phosphorus between sediment and water column, phytoplankton increased markedly with the highest diversity and evenness in the basins having intermediate phosphorus concentration. Overall, trophic state modulated sediment functions to supply nutrient and was in turn greatly affected by the sediment in shallow lakes.

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Patterns in phytoplankton taxonomic composition across temperate lakes of differing nutrient status

Cited by 411 publications

References 41 publications

Planktic Cyanobacteria from upper Tietê basin reservoirs, SP, Brazil

Planktic Cyanobacteria from upper Tietê basin reservoirs, SP, Brazil

Changes in species composition during annual cyanobacterial dominance in a tropical reservoir: physical factors, nutrients and grazing effects

Sediment–water interaction in phosphorus cycling as affected by trophic states in a Chinese shallow lake (Lake Donghu)

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