Phosphorus as a limiting factor for Eichhornia crassipes growth in the upper Paraná River floodplain

Kobayashi, Josilaine Taeco; Thomaz, Sidinei Magela; Pelicice, Fernando Mayer

doi:10.1672/07-89.1

Cited by 32 publications

(14 citation statements)

References 19 publications

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“…It is well known that phytoplankton biomass, expressed as chlorophyll-a concentration, is affected by nutrients, mainly phosphorus, both in temperate (e.g., Dillon and Rigler, 1974;Rigler and Peters, 1995;Van Nieuwenhuyse and Jones, 1996;Bryhn et al, 2007) and tropical and subtropical (Attayde and Bozelli, 1998;Huszar et al, 2006) freshwater ecosystems. In the Upper Paraná floodplain, phosphorus also limits microbial activity (Thomaz et al, 2001) and free-floating macrophytes (Kobayashi et al, 2008). However, our findings suggest that only 11% of the variation in chlorophyll-a concentration was explained by phosphorus concentration.…”

Section: Resultscontrasting

confidence: 61%

Modeling chlorophyll-a and dissolved oxygen concentration in tropical floodplain lakes (Paraná River , Brazil)

et al. 2009

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The need for prediction is widely recognized in limnology. In this study, data from 25 lakes of the Upper Paraná River floodplain were used to build models to predict chlorophyll-a and dissolved oxygen concentrations. Akaike's information criterion (AIC) was used as a criterion for model selection. Models were validated with independent data obtained in the same lakes in 2001. Predictor variables that significantly explained chlorophyll-a concentration were pH, electrical conductivity, total seston (positive correlation) and nitrate (negative correlation). This model explained 52% of chlorophyll variability. Variables that significantly explained dissolved oxygen concentration were pH, lake area and nitrate (all positive correlations); water temperature and electrical conductivity were negatively correlated with oxygen. This model explained 54% of oxygen variability. Validation with independent data showed that both models had the potential to predict algal biomass and dissolved oxygen concentration in these lakes. These findings suggest that multiple regression models are valuable and practical tools for understanding the dynamics of ecosystems and that predictive limnology may still be considered a powerful approach in aquatic ecology.

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Section: Resultscontrasting

confidence: 61%

Modeling chlorophyll-a and dissolved oxygen concentration in tropical floodplain lakes (Paraná River , Brazil)

et al. 2009

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“…The results of RGR of L. punctata were positively influenced by phosphorus, corroborating the study of Kobayashi et al, (2008) who evidenced the phosphorus as a limiting factor for the growth of a floating macrophyte species. Although the stream Água da Roseira had presented the highest concentration of total phosphorus, this stream along with Mandacaru, Miosótis and Água do Pirapó streams, have presented mean RGR significantly lower than the reference location, for both water and sediment; these streams had higher concentration of total nitrogen and higher pH.…”

Section: Discussionsupporting

confidence: 88%

Toxicity and genotoxicity of water and sediment from streams on dotted duckweed (Landoltia punctata)

et al. 2014

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Most rivers are used as a source to supply entire cities; the quality of water is directly related to the quality of tributaries. Unfortunately men have neglected the importance of streams, which receive domestic and industrial effluents and transport nutrients and pesticides from rural areas. Given the complexity of the mixtures discharged into these water bodies, this study aimed to evaluate the quality of water and sediment of ten tributaries of Pirapó River, in Maringá, Paraná State, Brazil. To this end, the free-floating macrophyte Landoltia punctata (G. Meyer) Les & D.J.Crawford was used as test organism in microcosm, and the toxicity of water and sediment samples was evaluated by the relative growth rate, dry/fresh biomass ratio, and genotoxic effects (comet assay). Samples of water and sediment of each stream were arranged in microcosms with L. punctata. Seven days later, plants were collected for analysis. Nutrient levels were higher than the reference location, indicating eutrophication, but the results indicated a toxic effect for only three streams, and a genotoxic effect for all streams.Keywords: Ecotoxicology, aquatic macrophyte, microcosm, anthropogenic pollution, comet assay. Toxicidade e genotoxicidade da água e sedimentos dos córregos em lentilha d'água (Landoltia punctata) ResumoMuitos rios são utilizados como fonte de abastecimento de cidades inteiras e a qualidade de suas águas está relacionada diretamente à qualidade de seus afluentes. Infelizmente córregos têm sua importância negligenciada pelo homem sendo alvo de despejos domésticos e industriais e também do carreamento de nutrientes e pesticidas das áreas rurais. Diante da complexidade das misturas que atingem estes corpos d'água, o presente estudo teve por objetivo avaliar a qualidade da água e do sedimento de dez afluentes do rio Pirapó no município de Maringá, Estado do Paraná. Utilizou-se a macrófita aquática flutuante Landoltia punctata (G. Meyer) Les & D.J.Crawford como organismo teste em microcosmos, sendo que a toxicidade das amostras de água e sedimento foi avaliada pela taxa de crescimento relativo, pelo índice de biomassa seca por fresca, e pelos efeitos genotóxicos (ensaio de cometa). Amostras de água e sedimento de cada córrego foram dispostos em microcosmos com L. punctata. Após 7 dias as plantas foram coletadas para as análises. Os níveis de nutrientes foram maiores que o do local de referência indicando eutrofização; porém, os resultados indicaram efeito tóxico em apenas três dos córregos e genotóxico em todos os córregos.Palavras-chave: Ecotoxicologia, macrófita aquática, microcosmos, poluição antrópica, ensaio de cometa.

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“…Gauted (1973) also showed that Salvinia have a capacity to store high levels of P, which can be used later when P supplies become limiting. In other aquatic plant, Eichhornia crassipes, there was higher total P in plant tissues and greater relative growth rates upon treatments with increase P concentration in the water (Kobayashi et al, 2008). Smith (2014), however, showed that the floating plant species used in the study had a nonlinear relationship with the total N in the field survey.…”

Section: Nitrogen and Phosphorus Concentration In Plantmentioning

confidence: 80%

Biomass allocation and nutrients balance related to the concentration of Nitrogen and Phosphorus in Salvinia auriculata (Salviniaceae)

2016

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Aquatic plants can use differential allocation (trade-off) of carbon among their structures depending on the nutrition concentration. Given that N and P are limiting in the growth of plants, our questions were: Are the N and P concentrations in S. auriculata related to the biomass allocation to its structures? Is a differential allocation of N and P between floating and submerged leaves? We evaluated the relation between the nutrients and the biomass allocation, and the trade-off among the leaves using the Spearman correlation. Our results showed that N and P concentrations in S. auriculata are related to the biomass allocation to its structures, and that there is no trade-off of these nutrients between "shoot and root". Thus, we can see the importance of N and P concentration in the biomass of S. auriculata, and why this plant is capable to development in different environments as a weedy.Keywords: nutrients, Salviniaceae, trade-off, resources. Alocação de biomassa e o Balanço de nutrientes relacionados à concentração de Nitrogênio e Fósforo em Salvinia auriculata (Salviniaceae) ResumoPlantas aquáticas podem realizar alocação diferencial (trade-off) de carbono entre as suas estruturas dependo da disponibilidade de nutrientes. Considerando que N e P são limitantes para o crescimento de plantas, nossas perguntas foram: As concentrações de N e P em S. auriculata estão relacionadas com a alocação de biomassa para suas estruturas? Existe alocação diferencial de N e P entre os folíolos aéreos e a "raiz"? Avaliamos a relação entre os nutrientes e a biomassa, e o trade-off entre as folhas utilizando correlação de Spearman. Os resultados encontrados mostram que as concentrações de N e P em S. auriculata estão relacionadas com a alocação de biomassa para as suas estruturas, e que não há um trade-off de N e P entre os folíolos aéreos e a "raiz". Dessa maneira, é possível observar a importância de N e P no ganho de biomassa de S. auriculata, e porque a espécie é capaz de se desenvolver em diferentes ambientes como uma planta daninha.

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Phosphorus as a limiting factor for Eichhornia crassipes growth in the upper Paraná River floodplain

Cited by 32 publications

References 19 publications

Modeling chlorophyll-a and dissolved oxygen concentration in tropical floodplain lakes (Paraná River , Brazil)

Modeling chlorophyll-a and dissolved oxygen concentration in tropical floodplain lakes (Paraná River , Brazil)

Toxicity and genotoxicity of water and sediment from streams on dotted duckweed (Landoltia punctata)

Biomass allocation and nutrients balance related to the concentration of Nitrogen and Phosphorus in Salvinia auriculata (Salviniaceae)

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