Toxicidade aguda da amônia não ionizada e do nitrito em alevinos de Cichlasoma facetum (Jenyns, 1842)

Piedras, Sérgio Renato Noguez; Oliveira, José Luis Ruas; Moraes, Paulo Roberto Rocha; Bager, Alex

doi:10.1590/s1413-70542006000500027

Cited by 9 publications

(5 citation statements)

References 4 publications

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“…This interaction among variables can be explained since they are all derived from nitrogenated compounds. According to Medeiros et al (2002) and Piedras et al (2006), nitrogen undergoes several changes in form and states of oxidation in the aquatic world. Those of greatest interest and in descending order of state of oxidation are: nitrate (NO 3 -), nitrite (NO 2 -), ammoniacal nitrogen (NH 4 -N) or ammonia (NH 3 or NH 4 + ) and organic nitrogen (dissolved or in suspension).…”

Section: Water Quality Index (Wqi)mentioning

confidence: 99%

Water quality index using multivariate factorial analysis

Coletti

Testezlaf

Ribeiro

et al. 2010

Rev. bras. eng. agríc. ambient.

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The evaluation of environmental effects generated by agricultural production on water quality became essential in Brazil after the creation of policies for the use and conservation of water resources. For such, water quality indices have been considered with the purpose of showing the spatial and temporal variation of water quality in a watershed. The objective of this study was to develop a water quality index (WQI) applying the Multivariate Factorial Analysis (MFA) statistical technique, which could indicate the influence of agricultural activities in the quality of water resources. Water in a predominantly farm watershed was monitored from Sept. 2003 to Sept. 2004. Monthly water collections were carried out at six sample points, and eight parameters were analyzed: nitrate, ammoniacal nitrogen, ammonia, total phosphorus, electrical conductivity, pH, suspended solids and turbidity, which were considered important due to the agricultural management adopted in the region. Results indicated a contamination of agricultural origin along the basin. Factorial analysis showed that ammonia, ammoniacal nitrogen and nitrate parameters were the ones that most contributed in determining the WQI.Key words: agricultural contamination, water resources, watershed Índice de qualidade de água usando análise fatorial multivariada RESUMO A avaliação dos impactos gerados pela agricultura sobre a qualidade da água tornou-se primordial no Brasil após o estabelecimento das políticas de uso e conservação dos recursos hídricos, razão por que índices de qualidade de água são propostos com o intuito de se mostrar a evolução da qualidade da água no tempo e no espaço. O objetivo primeiro neste estudo, foi desenvolver um índice de qualidade de água (IQA), utilizando-se a técnica estatística da Análise Fatorial Multivariada, avaliando-se a influência das atividades agrícolas na qualidade dos recursos hídricos; realizou-se, para se atingir o proposto, um monitoramento da qualidade da água em uma bacia hidrográfica de uso predominantemente agrícola, no período de set/03 a set/04. Realizaram-se, também, coletas mensais de água em seis pontos, analisando-se oito variáveis (nitrato, nitrogênio amoniacal, amônia, fósforo total, condutividade elétrica, pH, turbidez e sólidos suspensos), julgadas importantes pelo manejo agrícola adotado na região. Os resultados obtidos indicaram uma contaminação de origem agrícola ao longo da bacia, sendo que, pela análise fatorial, amônia, nitrogênio amoniacal e nitrato foram as variáveis que mais contribuíram na determinação do IQA.

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Section: Water Quality Index (Wqi)mentioning

confidence: 99%

Water quality index using multivariate factorial analysis

Coletti

Testezlaf

Ribeiro

et al. 2010

Rev. bras. eng. agríc. ambient.

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“…High levels of inorganic nitrogen pollution are harmful to aquatic organisms, including fish and invertebrates (Arthur et al ., 1987; Camargo & Alonso, 2005, 2006; Piedras et al ., 2006). The negative correlation found between acanthocephalans and total ammonia nitrogen concentration may be a result of the direct negative effect of this substance on the definitive host of the parasite.…”

Section: Discussionmentioning

confidence: 99%

Fish parasites as indicators of organic pollution in southern Brazil

et al. 2017

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Increasing urbanization along riverbanks is a constant source of stressors to the aquatic community, and the use of bioindicators is suitable to detect and monitor the effect of each stressor. We investigated the parasites of the 'cará' fish (Geophagus brasiliensis) as potential bioindicators in a river whose banks are subject to increasing anthropogenic pressure. Samples were taken at four points of the Sangradouro River, in Florianópolis, southern Brazil, bimonthly for 12 months. Water temperature, pH, dissolved oxygen, conductivity and salinity were measured at each point and water samples were taken for nutrient analysis (total nitrogen, nitrite, total ammonia nitrogen, total phosphorus, phosphate), and total and faecal coliforms. A generalized linear model (GLM) was constructed using the abundance of each parasite species as the response variable and biometric characteristic of the fish and water variables as possible predictors. Among the 137 fish examined, 114 (83.2%) were parasitized by at least one parasite species. Two species of ectoparasites (Sciadicleithrum guanduensis and Neascus-type metacercariae) and two species of endoparasites (Pandosentis aff. iracundus and Homalometron pseudopallidum) were observed. This is the first record of the genus Pandosentis in Brazilian waters and the first record of the species G. brasiliensis as a host for this parasite. Among the analysed groups of parasites, monogeneans and acanthocephalans proved to be the most sensitive to the concentrations of dissolved oxygen, faecal coliforms and total ammonia nitrogen in the water. Our study suggests that the abundance of both monoxenic and heteroxenous parasites can be negatively affected by organic pollution in the aquatic environment, reinforcing the potential of fish parasites as indicators of water quality.

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“…In both cases, fish tolerance to ammonia, nitrite and pH is the main focus of most of the research performed. [84][85][86][87] In addition, the toxic effects of pesticides and metals have also been considered. In fact, metals are potential disruptors of the ionic and osmotic balance in both fish and crustaceans.…”

Section: Aquatic Pollutants Of Concern and Biological Modelsmentioning

confidence: 99%

Toxicity tests aiming to protect Brazilian aquatic systems: current status and implications for management

Martins

Bianchini

2011

J. Environ. Monit.

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The current status of toxicological tests performed with Brazilian native species was evaluated through a survey of the scientific data available in the literature. The information gathered was processed and an electronic toxicology database (http://www.inct-ta.furg.br/bd_toxicologico.php) was generated. This database provides valuable information for researchers to select sensitive and tolerant aquatic species to a large variety of aquatic pollutants. Furthermore, the toxicology database allows researchers to select species representative of an ecosystem of interest. Analysis of the toxicology database showed that ecotoxicological assays have significantly improved in Brazil over the last decade, in spite of the still relatively low number of tests performed and the restricted number of native species tested. This is because most of the research is developed in a few laboratories concentrated in certain regions of Brazil, especially in Southern and Southeast regions. Considering the extremely rich biodiversity and the large variety of aquatic ecosystems in Brazil, this finding points to the urgent need for the development of ecotoxicological studies with other groups of aquatic animals, such as insects, foraminifera, cnidarians, worms, amphibians, among others. This would help to derive more realistic water quality criteria (WQC) values, which would better protect the different aquatic ecosystems in Brazil. Finally, the toxicology database generated presents solid and science based information, which can encourage and drive the Environmental Regulatory Agencies in Brazil to derive WQC based on native species. In this context, the present paper discusses the historical evolution of ecotoxicological studies in Brazil, and how they have contributed to the improvement of the Brazilian Federal and Regional regulations for environment.

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Toxicidade aguda da amônia não ionizada e do nitrito em alevinos de Cichlasoma facetum (Jenyns, 1842)

Cited by 9 publications

References 4 publications

Water quality index using multivariate factorial analysis

Water quality index using multivariate factorial analysis

Fish parasites as indicators of organic pollution in southern Brazil

Toxicity tests aiming to protect Brazilian aquatic systems: current status and implications for management

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