Diurnal and spatial (vertical) dynamics of nutrients (N, P, Si) in four sampling days (summer, fall, winter, and spring) in a tropical shallow reservoir and their relationships with the phytoplankton community

Ramírez, John Jairo; Bicudo, Carlos Eduardo de Mattos

doi:10.1590/s1519-69842005000100018

Cited by 15 publications

(9 citation statements)

References 5 publications

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“…From January 1997 to March 1998, macrophytes probably competed for nutrients thus contributing to P and N removal. Nevertheless, a monospecific spring bloom occurred (Fonseca, 2005) following the increase of stability, as it was also reported during 1994 (Ramírez & Bicudo, 2005), and persisted for one to a few months. The outbreak of macrophytes (April-August 1998) interrupted this pattern by either the shading canopy or as well reported, the nutrient storage by water hyacinth (Reddy, Agami & Tucker, 1990;Petrucio & Esteves, 2000;Rommens et al, 2003).…”

Section: Discussionmentioning

confidence: 57%

Undesirable side‐effects of water hyacinth control in a shallow tropical reservoir

et al. 2007

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1. Based on a comprehensive data set collected monthly during 8 years (1997)(1998)(1999)(2000)(2001)(2002)(2003)(2004), we evaluated the effects of mechanical removal of Eichhornia crassipes on the limnological characteristics and algal biomass of a polymictic shallow tropical reservoir. 2. Interrupted time series analyses indicated that the limnological responses to macrophyte removal can be classified as an 'abrupt permanent impact' implying that the overall mean of the time-series shifted promptly after intervention. These analyses indicated a significant increase for pH, total phosphorus, total phytoplankton and cyanobacterial biomass, and a decrease in water transparency and CO 2 concentrations in the surface water; also, the increase in water stability, increase of bottom soluble reactive phosphorus (SRP) and decrease in bottom oxygen levels. 3. Cyclic anoxic periods previously observed during springs and summers were replaced by a persistent period of anoxic conditions in the sediment overlying water. Anoxic conditions were suitable for SRP release from sediments. Heavy cyanobacterial blooms became more persistent, maximum biomass (4229 mm 3 L )1 ) was 30 times larger, the blooms frequently reached 2 m and sometimes the bottom of the reservoir, contrasting to the preremoval period in which it reached at most 1 m deep. 4. The long-term P dynamics in the system, initially driven by allochthonous nutrient loadings were replaced by internal ecological processes. Water hyacinth removal markedly accelerated the process of eutrophication due to internal feedback mechanisms, leading to a switch to a more turbid state. Biological feedback mechanisms were driven by cyanobacterial blooms by enhancing water stability, oxygen anoxia at the bottom and by increasing suitable conditions for P internal loading. These data support the hypothesis of the role of cyanobacterial blooms as an important factor impairing water quality and driving the ecosystem towards a stable degraded state. 5. These findings have important implications for the restoration of shallow stratifying eutrophic lakes, as the alternative degraded state is most likely to occur when compared with their non-stratifying counterparts. Moreover, feedback mechanisms in tropical and subtropical shallow lakes seem to be stronger than in temperate ones, as stratification events are more likely to occur over the year, intensifying system resilience to restorative strategies.

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Section: Discussionmentioning

confidence: 57%

Undesirable side‐effects of water hyacinth control in a shallow tropical reservoir

et al. 2007

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“…Garças Pond phytoplankton was already described from various aspects like taxonomy (Azevedo & Sant'Anna, 1999Komárek & Azevedo, 2000;Tucci et al, 2006), ecology (Sant'Anna et al, 1989, 1997Ramírez & Bicudo, 2002;Tucci, 2002;Tucci & Sant'Anna, 2003;Fonseca, 2005;Ramírez & Bicudo, 2005;Crossetti & Bicudo, 2005a, b;Crossetti, 2006) and toxicology (Sant'Anna & Azevedo, 2000). The reservoir's limnological features changed substantially over the last 10 years, especially due to the undesirable side effects of the water hyacinth control.…”

Section: Introductionmentioning

confidence: 99%

Phytoplankton seasonal variation in a shallow stratified eutrophic reservoir (Garças Pond, Brazil)

Fonseca

Bicudo

2007

Hydrobiologia

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This study aimed at describing the phytoplankton dynamics and structure in a shallow eutrophic reservoir, the Garças Pond, located in the Parque Estadual das Fontes do Ipiranga (23°38 0 40.6 00 S, 46°37 0 28.0 00 W), in the Municipality of São Paulo, southeast Brazil. Samples were collected monthly from January to December 1997 in five depths (subsurface, 1 m, 2 m, 3 m, and 20 cm above the bottom) in the pelagic zone (Z max = 4.7 m). Abiotic variables studied were: water temperature, turbidity, transparency, conductivity, pH, dissolved oxygen, alkalinity, inorganic carbon, and N and P dissolved and total forms. Altogether 236 phytoplankton taxa distributed among 10 classes were identified. Phytoplankton seasonal and vertical variation was related to shifts in the water chemical features as a consequence of a warm-wet season with stratified water column (phase 1, January-March and SeptemberDecember) alternating with a cool-dry season with mixed water column (phase 2, April-August). There were shifts in cyanobacterial dominance over the entire year. During phase 1, Raphidiopsis/Cylindrospermopsis was one of the most important taxon. During phase 2, Raphidiopsis/Cylindrospermopsis biomass decreased, whereas richness and diversity increased and diatoms were relatively abundant. In September, when the water column was markedly stratified, a cyanobacterial bloom (Sphaerocavum brasiliense) occurred. Changes in water chemical variables caused by the bloom allowed recognition of a phase 3, in which pH and chlorophyll a, TP and CO 3 2-concentration reached their highest values. According to Reynolds and collaborators' functional groups approach, phase 1 was marked by groups S/ W1/W2/H1/Y, phase 2 by groups K/L M /L O /D/P/X1/ F, and phase 3 by group M. This sequence was corroborated by canonical correspondence analysis (CCA) results.

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“…One of the function of nitrate utilization is as an agent for protein synthesis. The high concentration of nitrate in aquatic environment then can be utilized as a source of nutrients to produce new cells and colonies [9]. Phosphorus is a limiting factor for nutrients needed for the growth of hydromacrophyte and Microcystis.…”

Section: Interaction Between Microcystis Scirpus Grossus and Limnocmentioning

confidence: 99%

The Effectivity of Scirpus Grossus and Limnocharis Flava As Fitoremediation Agents of Nitrate-Phosphate To Prevent Microcystis Blooming In Fresh Water Ecosystem

Sundari¹,

Suharjono²,

Departement³

2013

JTLS

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The aim of this study was to reduce the concentration of dissolved nitrate-phosphate, because it can prevent the occurrence and inhibit the growth of Microcystis bloom waters. The study was conducted experimentally in the laboratory. The Microcystis isolation was carried out in Sutami Reservoir. Then, remediation treatment with hydromacrophyte (Scirpus grossus, Limnocharis flava and combination of both hydromicrophyte) were done during the 15 day incubation period. Abiotic factors were measured on day 0, 6, 12 and 15, but the abundance of Microcystis cells was counted daily. The productivity of hydromacrophyte was measured at the end of the research. The research results showed that hydromacrophytes were effective to reduce nitrate and phosphate concentrations. The combination of S. grossus and Microcystis reduced nitrate concentration up to 99.89 %, while the highest reduction of dissolved phosphate (98.22 %) was resulted from the combination of L. flava and Microcystis. The combination treatment of L. flava and S. grossus was capable to prevent Microcystis growth rate and produced the carying capacity of 65 cells.L-1.day-1 and 6.93 x 10 4 cells/mL.

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Diurnal and spatial (vertical) dynamics of nutrients (N, P, Si) in four sampling days (summer, fall, winter, and spring) in a tropical shallow reservoir and their relationships with the phytoplankton community

Cited by 15 publications

References 5 publications

Undesirable side‐effects of water hyacinth control in a shallow tropical reservoir

Undesirable side‐effects of water hyacinth control in a shallow tropical reservoir

Phytoplankton seasonal variation in a shallow stratified eutrophic reservoir (Garças Pond, Brazil)

The Effectivity of Scirpus Grossus and Limnocharis Flava As Fitoremediation Agents of Nitrate-Phosphate To Prevent Microcystis Blooming In Fresh Water Ecosystem

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