Effects of nutrient impoverishment on phytoplankton biomass: a mesocosms experimental approach in a shallow eutrophic reservoir (Garças Pond), São Paulo, southeast Brazil

Crossetti, Luciane Oliveira; Bicudo, Carlos Eduardo de Mattos

doi:10.1590/s0100-84042005000100009

Cited by 14 publications

(8 citation statements)

References 26 publications

(24 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…On the contrary, adding nutrients favored the growth of the green algae and was, on the whole, not beneficial to the flagellates, diatoms, and cyanobacteria, causing a decline in evenness. Such nutrient effects probably were due to the higher competitive ability of the green algae under high nutrient levels, insofar as they are one of the taxonomic groups more favored by nutrient additions [10,48].…”

Section: Chlorella Vulgarismentioning

confidence: 99%

An in situ toxicity assay with the local phytoplankton community

Moreira‐Santos

Antunes

Gonçalves

et al. 2010

Enviro Toxic and Chemistry

View full text Add to dashboard Cite

The present study describes an approach for toxicity estimates based on the in situ exposure of the local phytoplankton community immobilized in calcium-alginate beads. The assay was deployed in an acid mine drainage-impacted system, at a reference site and an impacted site. Abundances and growth rates of major taxonomic groups (green algae, flagellates, diatoms, and cyanobacteria) and of the entire community were measured. The ecological relevance of classical toxicity estimates was evaluated by performing in situ and laboratory assays with the standard species Pseudokirchneriella subcapitata and Chlorella vulgaris. Site waters were tested without and with nutrient enrichment, to discriminate toxic effects from those caused by nutrient limitations. Despite the occurrence of growth-limiting conditions for the local phytoplankton within the alginate matrix, an impact of the mine effluent on the community was detected. The growth of the community and of all taxonomic groups, except for the cyanobacteria, was less at the impacted site than at the reference site, although adding nutrients partially compensated for the effluent detrimental effects. Shifts in the community structure were also provoked by the mine effluent; decreases in the abundance of green algae were paralleled by increases in the abundance of flagellates and diatoms, but mainly of cyanobacteria. Effects on the growth of both standard species of green algae were in conformity with those on the local phytoplankton, probably because the latter was dominated by green algae. Although future improvements regarding the cell immobilization technique should be attempted, the proposed easy and inexpensive approach to assess both the growth and the structure of local phytoplankton communities will allow more environmentally realistic site-specific assessments of water quality.

show abstract

Section: Chlorella Vulgarismentioning

confidence: 99%

An in situ toxicity assay with the local phytoplankton community

Moreira‐Santos

Antunes

Gonçalves

et al. 2010

Enviro Toxic and Chemistry

View full text Add to dashboard Cite

show abstract

“…Similar to the study by Minello et al (2010), electrical conductivity values tended to Edna Ferreira Rosini et al increase during the rainy season, different from what was observed by Alves and Baccarin (2005). Some authors argue that rainfall has a diluting effect, and such dilution could decrease the electrical conductivity values (Alves and Baccarin, 2005;Crossetti and Bicudo, 2005). However, the input of a larger volume of water can increase the amount of dissolved solids transported to the reservoirs through the leaching process; that is likely why higher DO values were recorded in the rainy season.…”

Section: Resultsmentioning

confidence: 99%

Water quality in Ponte Pensa Aquaculture Park, Solteira Island Reservoir, SP, Brazil, where fish are cultivated under great-volume cage system

et al. 2019

View full text Add to dashboard Cite

This study analyzes spatial and temporal variations in physical and chemical water variables due to the influence of fish culture in a cage system (20x20x3 m) in Ponte Pensa Aquaculture Park (Solteira Island Reservoir), before and after cage installation. Water samples were collected on a monthly basis in the subsurface of three sampling sites (August/2011 to July/2013): downstream from the farming site (S1), at the farming site (S2), and upstream from the farming site (S3) (n = 72). Water temperature, pH, dissolved oxygen, transparency, turbidity, electrical conductivity, ammonium ion and total phosphorus were assessed. The principal component analysis (PCA) was applied to joint analysis data. PCA results explained the 61% joint variability in data of the first two components. Fish farming in cages caused significant temporal changes, mainly in January 2013, as well as sudden spatial changes in water physical and chemical variables. Fish culture influenced the quality of the water; such influence was mainly indicated by variations in ammonium ions and in total phosphorus concentrations, which were confirmed through PCA application. PCA results showed two distinct temporal phases: Phase 1 -prior to fish-cage farming, when limnological conditions were characterized by the highest dissolved oxygen concentrations and by high temperatures; Phase 2 -post-production period, when limnological conditions were characterized by the highest total phosphorus and ammonium ion concentrations.Edna Ferreira Rosini et al. Influência da piscicultura em tanques-redes de grande volume na qualidade da água do Parque Aquícola Ponte Pensa, Reservatório IlhaSolteira, SP, Brasil RESUMO O objetivo do presente estudo é analisar a variação espacial e temporal das variáveis físicas e químicas da água na zona de influência da tilapicultura em tanques-redes (20x20x3 m) no parque aquícola Ponte Pensa (Reservatório de Ilha Solteira), abrangendo os períodos pré e pósintrodução da produção. Amostras da água foram obtidas mensalmente (agosto/2011 a julho/2013) na subsuperfície em três estações de amostragem: jusante da área de criação (S1), local de criação (S2) e a montante (S3) (n=72). Foram avaliadas a temperatura da água, pH, oxigênio dissolvido, transparência, turbidez, condutividade elétrica, íon amônio e fósforo total. Utilizou-se a PCA para análise conjunta dos dados. A PCA explicou 61% da variabilidade conjunta dos dados nos dois primeiros componentes. As atividades da piscicultura em tanquesrede provocaram alterações temporais, detectadas especialmente a partir de janeiro de 2013, e sutis alterações espaciais nas variáveis físicas e química da água. O íon amônio e o fósforo total foram as variáveis que mais indicaram a influência desta atividade na qualidade da água, confirmados pela PCA que demostrou duas fases temporais distintas: Fase 1-em que as condições limnológicas antes da produção de peixes em tanques-rede foram caracterizadas pelas maiores concentrações de oxigênio dissolvido e altas temperaturas; e Fase 2período pós-produção, q...

show abstract

“…Similar to the study by Minello et al (2010), electrical conductivity values tended to 10 Edna Ferreira Rosini et al increase during the rainy season, different from what was observed by Alves and Baccarin (2005). Some authors argue that rainfall has a diluting effect, and such dilution could decrease the electrical conductivity values (Alves and Baccarin, 2005;Crossetti and Bicudo, 2005). However, the input of a larger volume of water can increase the amount of dissolved solids transported to the reservoirs through the leaching process; that is likely why higher DO values were recorded in the rainy season.…”

Section: Resultsmentioning

confidence: 99%

Untitled

2019

Rev. ambiente água

View full text Add to dashboard Cite

With the goal of assessing possible impacts of fish farming in great-volume cage systems on the water quality of a reservoir, the authors provided abiotic data from 72 samples obtained before and after farming site implementation. The figure shows the principal components analysis results for seven limnological variables. The highest dissolved oxygen (OD) concentrations were observed before the fish farm became operational. During the post-production period, the highest phosphorous (PT) and ammonium (NH4) concentrations were observed as well as high conductivity and turbidity values. Authors concluded that fish farming in cage systems located in Solteira Island Reservoir, Brazil, caused significant temporal and sudden spatial changes in water physical and chemical variables. Source: ROSINI, E. F. et al. Water quality in Ponte Pensa Aquaculture Park, Solteira Island Reservoir, SP, Brazil, where fish are cultivated under greatvolume cage system.

show abstract

Effects of nutrient impoverishment on phytoplankton biomass: a mesocosms experimental approach in a shallow eutrophic reservoir (Garças Pond), São Paulo, southeast Brazil

Cited by 14 publications

References 26 publications

An in situ toxicity assay with the local phytoplankton community

An in situ toxicity assay with the local phytoplankton community

Water quality in Ponte Pensa Aquaculture Park, Solteira Island Reservoir, SP, Brazil, where fish are cultivated under great-volume cage system

Untitled

Contact Info

Product

Resources

About