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In situ tests for water quality assessment: a case study in Pampean rivers

Graça, Manuel A. S.; Rodrígues-Capítulo, Alberto; Ocón, Carolina; Gómez, Nora
Fonte: Universidade de Coimbra Publicador: Universidade de Coimbra
Tipo: Artigo de Revista Científica Formato: aplication/PDF
ENG
Relevância na Pesquisa
46.26%
Two invertebrate species (Hyalella curvispina and Palaemonetes argentinus) and one macrophyte (Egeria densa) from a naturally high nutrient content system (Pampean rivers of La Plata, Argentina) were evaluated for their potential use in situ assays aiming to assess changes in water quality. Invertebrates were individually placed in cylindrical chambers in polluted sections of rivers and in reference upstream sites. Mortality after 48 h was high in polluted and reduced in control sites. Mortality was also higher in situ assays than in laboratory static tests. Standard sections of the macrophyte were also deployed at the reference and control sites. Growth (7 days) in terms of mass increment (but not in length) was consistently reduced in polluted sites. Results of benthic invertebrate and periphitic algae surveys were consistent with the in situ tests: pollution resulted in a decrease in the number of taxa, taxa replacement and in changes in the value of the biotic indices Ìndice Biótico PAMPeano and Índice de Diatomeas Pampeano, indicating deterioration of water quality. In situ assays have a high potential as environmental tools in integrated approaches of bioassessment programs.; http://www.sciencedirect.com/science/article/B6V73-45N81GB-1/1/55c57367e37608efea5d0655086ae214

The elaboration of indices to assess biological water quality. A case study

Graça, M. A. S.; Coimbra, C. N.
Fonte: Universidade de Coimbra Publicador: Universidade de Coimbra
Tipo: Artigo de Revista Científica Formato: aplication/PDF
ENG
Relevância na Pesquisa
46.49%
Here we tested the application of a nodal analysis for the elaboration of biotic indices for particular stressing conditions. The work was carried out in an intermittent Mediterranean stream where superficial flow was absent during summer. The river was perturbed by an effluent with high pH, sulphates, nitrates and conductivity. "Summer" and "winter" samples were treated separately. We first identified groups of sites differing in taxonomical composition by cluster analysis. Then we tested whether groups of sites also differed in their abiotic characteristics. In the following step, groups of cooccurring taxa were also identified by cluster analysis. The indicator value of a taxa group was measured by fidelity measurements for site groups. Indicator taxa were incorporated in a water quality table. The biotic index in the water quality table clearly discriminated impacted from reference sites in the two following years and was correlated with the first axis of a correspondence analysis biplot which also discriminated impacted from clean sites. We suggest that nodal analysis can be a reliable technique for the identification of bioindicators and the elaboration of biotic indices.; http://www.sciencedirect.com/science/article/B6V73-3SX5H1V-F/1/2ddcd6137e173976c270b458bbb4c99c

Bases para aplicação de índices biológicos no biomonitoramento de ambientes lóticos - comunidade bentônica; Bases for Biological Index use in lotic Environment Biomonitoring - Benthic Community

Watanabe, Helena Mitiko
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 18/09/2007 PT
Relevância na Pesquisa
36.55%
A utilização da comunidade bentônica em biomonitoramento, como indicadora da qualidade de ambientes aquáticos, encontra-se atualmente bem estabelecida. Das duas abordagens sugeridas pelo Protocolo de Avaliação Rápida da USEPA, a que utiliza um único meso-hábitat mostra-se ideal para o biomonitoramento sendo, portanto, necessário estabelecer qual meso-hábitat utilizar. Este trabalho pretende avaliar a sensibilidade e adequabilidade de diferentes meso-hábitat ribeirinhos em biomonitoramento. Foram estabelecidos oito pontos de amostragem, localizados nos rios Atibainha, Cachoeira e Atibaia, na Bacia Hidrográfica do Rio Piracicaba, São Paulo. Amostras foram coletadas na estação chuvosa (março), para análise de variáveis ambientais (água e sedimento) e biótica (macroinvertebrados bentônicos). Os organismos da comunidade bentônica foram identificados ao nível de família para os principais taxa. Os dados ambientais e bióticos foram submetidos à análise de agrupamento e ordenação, e para o diagnóstico da qualidade do ambiente aquático, índices individualizados e abordagem multimétrica foram utilizados. Tanto as variáveis ambientais quanto a biótica separaram nitidamente regiões de alto (3ª e 4ª ordens) e baixo gradiente (5ª e 6ª ordens). Dos meso-hábitats analisados por meio da comunidade bentônica...

Caracterização da ictiofauna e aplicação do índice de integridade biótica no Parque Nacional do Pantanal Mato-grossense, Poconé, MT; Fish assemblage characterization and the index of biotic integrity performance in the Pantanal National Park, Poconé, MT, Brazil

Polaz, Carla Natacha Marcolino
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 01/03/2013 PT
Relevância na Pesquisa
36.48%
O Pantanal é um complexo de ecossistemas que exibe grande diversidade de ambientes aquáticos. O objetivo geral deste estudo foi caracterizar a estrutura da comunidade de peixes no Parque Nacional do Pantanal Mato-grossense (PNPM), uma Unidade de Conservação federal localizada no município de Poconé, MT, a fim de apoiar a construção de um instrumento de monitoramento baseado na integridade biótica do ambiente aquático. Tal objetivo foi obtido através da adaptação do Índice de Integridade Biótica para o PNPM (IIBPNPM). Previamente ao capítulo sobre a construção do IIBPNPM, que se espera representativo para uma porção ainda intocada do Pantanal, os dois primeiros capítulos fornecem os dados necessários para subsidiar a aplicação do índice. O primeiro trata da caracterização dos diferentes ambientes que ocorrem no PNPM, agrupados em quatro estratos ambientais: rios principais (rios Cuiabá e Paraguai), corixos (canais de ligação da planície de inundação), baías permanentes (não perdem a conexão na seca) e baías temporárias (aquelas que perdem conexão com os outros elementos da planície). Essa caracterização foi realizada na primeira campanha exploratória ao PNPM, em setembro de 2009, quando foram definidos os pontos de amostragem de água e de peixes. Testes estatísticos foram realizados para verificar a existência de associação entre os diferentes estratos e os fatores abióticos (variáveis físicas e químicas da água)...

Integridade biótica dos ecossistemas na região do Arquipélago dos Alcatrazes, São Sebastião - SP; Biotic integrity from the ecosystems of the Alcatrazes archipelago surroundings, São Sebastião - SP

Hoff, Natasha Travenisk
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 23/06/2015 PT
Relevância na Pesquisa
36.51%
A Estação Ecológica (ESEC) Tupinambás, uma UC marinha de proteção integral, está localizada no litoral norte do estado de São Paulo (SP). Foi criada em 1987, sendo utilizada pela Marinha do Brasil para exercícios de tiro até recentemente no arquipélago dos Alcatrazes (São Sebastião, SP). Isto justifica a baixa quantidade de informações disponíveis sobre essa região. Através do levantamento de informações sobre a composição biológica, aspectos socioeconômicos e oceanográficos da área do arquipélago, da utilização de índices ecológicos (dominância, diversidade, riqueza e equabilidade) e multimétricos (Índice ABC e Índice de Integridade Biótica), e da elaboração da Carta de Sensibilidade Ambiental ao Derramamento de Óleo, verificou-se (1) a semelhança da composição ictiofaunística do arquipélago dos Alcatrazes em relação à Santos e São Sebastião, (2) se a região mantém a integridade biótica da ictiofauna mesmo localizando-se entre regiões impactadas, e (3) se o ponto mais sensível ecologicamente detectado pela carta SAO pode ser a área de maior suscetibilidade de ser atingida por um derramamento de óleo. Os dados analisados são provenientes de trabalhos pretéritos e coletas realizadas em setembro de 2011 e janeiro de 2014. A composição ictíica variou ao longo do tempo e períodos de coleta...

Tracing coastal organic enrichment: stable isotopes and biotic indices

Sampaio, Leandro José Ribeiro Torres
Fonte: Universidade de Aveiro Publicador: Universidade de Aveiro
Tipo: Tese de Doutorado
ENG
Relevância na Pesquisa
46.64%
Neste trabalho foi efectuada uma avaliação integrada usando descritores sedimentares e biológicos ao nível da espécie e da comunidade e índices bióticos de síntese para o traçamento do enriquecimento orgânico numa região, com características dispersivas, da costa Oeste de Portugal. Na área estudada existem gradientes ambientais e biológicos relacionados com a heterogeneidade da paisagem sedimentar, a qual inclui sedimentos desde areias finas limpas a vasas. Contudo, na área próxima do emissário, esta paisagem é mais homogénea e constituída por areia fina com baixo teor em finos. Nesta região, alguns dos descritores estudados deram uma indicação coerente de alterações ambientais associadas ao enriquecimento orgânico. O potencial de oxidação - redução mostrou valores negativos até 250 m do emissário, o que indicia que a degradação da matéria orgânica que entra no sistema cria condições reduzidas no sedimento. Os isótopos estáveis de carbono e azoto no sedimento diferenciam a área mais próxima do emissário, que apresenta uma depleção de acordo com uma origem terrestre da matéria orgânica naquela parte da plataforma. Uma imagem similar foi obtida pela análise dos isótopos estáveis na macrofauna que diagnosticou a origem terrestre da matéria orgânica consumida. A composição específica e a abundância das comunidades bentónicas também são significativamente diferentes junto ao emissário...

A comparison between biotic indices and predictive models in stream water quality assessment based on benthic diatom communities

Feio, Maria J.; Almeida, Salome F. P.; Craveiro, Sandra C.; Calado, Antonio J.
Fonte: Elsevier Publicador: Elsevier
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
46.18%
Diatoms are widely used in stream bioassessment due to their broad distribution, extraordinary variability and the ability to integrate changes in water quality. The indices Specific Polluosensitivity Index (SPI), standardized Biological Diatom index (BDI), European Economic Community Index (CEC) and Generic Diatom Index (GDI), originally developed in France, are often applied in Portugal to evaluate stream ecological quality based on diatom communities. Alternatively, predictive models resulting from the comparison between the communities of the study site and those of a set of reference sites representing undisturbed or the best available conditions of a given region have been proposed as valuable methods for evaluating the ecological status of streams. In the present study, we applied the four above-mentioned widely used diatom-based indices (SPI, BDI, CEC and GDI) and a predictive model (MoDi) to 54 sites located in central Portugal to assess the sensitivity of the five methods to a range of anthropogenic disturbances cumulatively affecting streams and represented by 27 variables (e.g., organic enrichment, changes in morphology of the channels, integrity of the riparian corridor, land use in the catchment). The results were analyzed comparatively through Spearman correlations...

Indices, multispecies and synthesis descriptors in benthic assessments: Intertidal organic enrichment from oyster farming

Quintino, V.; Azevedo, A.; Magalhães, L.; Sampaio, L.; Freitas, R.; Rodrigues, A. M.; Elliott, M.
Fonte: Elsevier Publicador: Elsevier
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
56.38%
Intertidal off-bottom oyster culture is shown to cause organic enrichment of the shore and although there are two stressors of interest (the presence of a structure, the trestles, and also the sediment and organic waste from the oysters), these can be separated and their relative impacts determined using an appropriate nested experimental design and data treatments. Although no artificial food sources are involved, the oysters feeding activity and intensity of culture enhances biodeposition and significantly increases the sediment fines content and total organic matter. This in general impoverished the benthic community in culture areas rather than a species succession with the installation of opportunists or a resulting increase in the abundance and biomass of benthic species; the findings can be a direct consequence of the intertidal situation which is less-amenable recruitment of species more common to the subtidal environment. Thus the most appropriate biological descriptors to diagnose the effects associated with the organic enrichment were the multispecies abundance data as well as the primary biological variables species richness and abundance. The effects were however spatially and statistically significantly confined to the area located directly underneath the culture bags compared to the corridors located between the trestles...

Can biotic indices detect mild organic enrichment of the seafloor?

Sampaio, L.; Rodrigues, A. M.; Quintino, V.
Fonte: Elsevier Publicador: Elsevier
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
66.7%
Synthesis indices have been developed in order to implement the Water Framework Directive (WFD) goal of achieving a good ecological status for European waters and so need to be validated and inter-calibrated. This study was conducted in a coastal area under mild organic enrichment from a sewage outfall where no other anthropogenic point source disturbance exists. Results are presented from an integrated assessment in order to test if biotic indices would give a response comparable to that of other descriptors. The study included the analysis of sediment descriptors, stable carbon and nitrogen isotopes in benthic species, benthic community species composition and abundance, and biotic indices. The various groups of descriptors were tested under the null hypothesis of no significant alterations with increasing distance from the outfall. The sediment grain-size, median and total organic matter did not cause rejection of the null hypothesis, in contrast to the sediment redox potential and the stable carbon isotopic composition. The benthic community species composition and abundance and their stable carbon isotopic composition also rejected the null hypothesis. In areas closer to the outfall, the redox potential showed negative values...

Benthic macroinvertebrate based indices for assessing the ecological status of freshwaters on oceanic islands

Raposeiro, Pedro M.; Costa, Ana C.
Fonte: Universidade dos Açores Publicador: Universidade dos Açores
Tipo: Artigo de Revista Científica
Publicado em //2009 ENG
Relevância na Pesquisa
36.34%
Following the Water Framework Directive (2000/60/EC), macroinvertebrates are required biological elements for monitoring European aquatic ecosystems. Several efforts have been made towards establishing a biomonitoring programme for the Azores freshwater systems using benthic macroinvertebrates. However, little was previously known concerning Azorean freshwater macroinvertebrate fauna. Data from a major ongoing survey of macroinvertebrate freshwater fauna for two islands are presented and the use of macroinvertebrates as water quality indicators for the Azorean streams is evaluated. The upper, middle and lower reaches of streams longer than 10 km from São Miguel (10) and Santa Maria (1) were surveyed (a total of 33 samples). A total of 21 taxa were collected; Diptera, in particular chironomidae, were dominant; chironomids were collected from all sampling sites. The Azorean lotic fauna is characterized by low levels of abundance and the absence of macroinvertebrate groups commonly associated with continental systems. Traditional biotic indices, used to classify ecological quality, yielded poor to bad classifications despite little or no environmental impacts at the sampling sites. The paucity of macroinvertebrate fauna is probably due to the result of geological and physicochemical processes...

Are the streams of the Sinos River basin of good water quality? Aquatic macroinvertebrates may answer the question

Bieger,L.; Carvalho,ABP; Strieder,MN; Maltchik,L.; Stenert,C
Fonte: Instituto Internacional de Ecologia Publicador: Instituto Internacional de Ecologia
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/12/2010 EN
Relevância na Pesquisa
46.6%
Macroinvertebrate communities are one of the most used groups in assessments of water quality, since they respond directly to the level of contamination of aquatic ecosystems. The main objective of this study was the assessment of the water quality of the Sinos River basin (Rio Grande do Sul state, Brazil) through biotic indices based on the macroinvertebrate community ("Family Biotic Index - FBI", and "Biological Monitoring Working Party Score System - BMWP"). Three lower order streams (2nd order) were selected in each one of three main regions of the basin. In each stream, the samplings were performed in three reaches (upper, middle, and lower), totalling 27 reaches. Two samplings were carried in each reach over one year (winter and summer). A total of 6,847 macroinvertebrates distributed among 54 families were sampled. The streams from the upper region were of better water quality than the lower region. The water quality did not change between the upper, middle and lower reaches of the streams. However, the upper reaches of the streams were of better water quality in all the regions of the basin. The water quality of the streams did not vary between the summer and the winter. This result demonstrated that water quality may be analysed in both studied seasons (summer and winter) using biotic indices. The analysis of the results allows us to conclude that the biotic indices used reflected the changes related to the water quality along the longitudinal gradient of the basin. Thus...

Macroinvertebrados bentônicos como indicadores de qualidade ambiental de afluentes do Rio Uberabinha, Uberlândia - MG; Benthic macroinvertebrates as environmental quality indicators of Uberabinha river tributaries, Uberlândia - MG

Guimarães, Renata de Moura
Fonte: Universidade Federal de Uberlândia Publicador: Universidade Federal de Uberlândia
Tipo: Dissertação
POR
Relevância na Pesquisa
46.49%
A utilização de índices bióticos e de diferentes métricas de macroinvertebrados bentônicos tem sido amplamente explorada em estudos realizados em sistemas lóticos no contexto da avaliação ambiental, assim como o conhecimento da relação biótico e abiótico e da dinâmica longitudinal das variáveis físico-químicas desses ambientes aquáticos. Este estudo objetivou avaliar a qualidade da água de córregos da área urbana de Uberlândia – MG, utilizando métricas das comunidades de macroinvertebrados bentônicos, além de caracterizar a dinâmica longitudinal e sazonal de variáveis físico-químicas nesses córregos, avaliar a distribuição e a variação sazonal dos macroinvertebrados e a influência de variáveis ambientais sobre essas comunidades. O córrego Cabeceira do Lageado (C1) situa-se em uma Reserva Ecológica, já os córregos Buritizinho (C2), Lobo (C3) e Bons Olhos (C4) estão inseridos diretamente na malha urbana. Foram realizadas coletas na estação chuvosa e na estação seca, avaliadas as condições ecológicas dos locais e calculadas as métricas BMWP, diversidade de Shannon-Wiener, eqüidade de Pielou, riqueza de taxa, percentagem de EPT, Chironomidae e Oligochaeta. A comparação dessas métricas entre córregos em cada período de amostragem foi realizada através de Análise de Variância (ANOVA One Way)...

The varying role of population abundance in structuring indices of biotic homogenization

Cassey, P.; Lockwood, J.; Olden, J.; Blackburn, T.
Fonte: Blackwell Science Ltd Publicador: Blackwell Science Ltd
Tipo: Artigo de Revista Científica
Publicado em //2008 EN
Relevância na Pesquisa
36.38%
Aim: An important component of human-induced global change is the decrease or increase in community distinctiveness (taxonomic homogenization or differentiation, respectively) that follows the loss of native species and gain of non-native species. We use simulation approaches to assess the extent to which conclusions about the outcome of the homogenization process depend on whether or not abundance data are incorporated. Location: Data were produced through computer simulation. Methods: The frequency with which occurrence-based similarity indices and abundance-based similarity indices give different views of changes in community similarity, and the conditions under which such differences occurred were assessed using both deterministic and stochastic modelling approaches to simulate species assemblage states. Results: Occurrence-based and abundance-based indices were positively correlated across the set of simulations for both the deterministic and stochastic models. However, in both situations approximately one quarter (25%) of models resulted in contrasting outcomes for the two approaches of calculating changes in compositional similarity; that is, one data type showed a positive value (homogenization), whereas the other showed a negative value (differentiation). Main conclusions: In the majority of cases...

Evaluation of the applicability of a marine biotic index to characterize the status of estuarine ecosystems: the case of Mondego estuary (Portugal)

Salas, F.; Neto, J. M.; Borja, A.; Marques, J. C.
Fonte: Universidade de Coimbra Publicador: Universidade de Coimbra
Tipo: Artigo de Revista Científica Formato: aplication/PDF
ENG
Relevância na Pesquisa
36.37%
The need for new tools to assess the environmental status of coastal and estuarine systems encouraged Borja et al. [Mar. Pollut. Bull. 40 (2000) 1100] to develop a new index, the AZTI's Marine Biotic Index (AMBI), which needs to be tested as much as possible in different geographical areas to assess its applicability. This index was applied in the Mondego estuary (western coast of Portugal) together with the Shannon-Wiener, Margalef, Simpson, and W-statistic indices, which are widely used in detecting the effects of marine pollution. Results show that, in some cases, the AMBI provides a more accurate assessment of environmental conditions than the other indices, which were influenced by the dominance of certain species, allowing us to consider it as a promising tool to characterize marine and estuarine environmental quality.; http://www.sciencedirect.com/science/article/B6W87-4CSG1T5-2/1/6d688b07e739ef7fe77229f28bc91999

Review and evaluation of estuarine biotic indices to assess benthic condition

Pinto, Rute; Patrício, Joana; Baeta, Alexandra; Fath, Brian D.; Neto, João M.; Marques, João Carlos
Fonte: Universidade de Coimbra Publicador: Universidade de Coimbra
Tipo: Artigo de Revista Científica Formato: aplication/PDF
ENG
Relevância na Pesquisa
66.61%
Recently there has been a growing interest and need for sound and robust ecological indices to evaluate ecosystem status and condition, mainly under the scope of the Water Framework Directive implementation. Although the conceptual basis for each index may rely on different assumptions and parameters, they share a common goal: to provide a useful tool that can be used in assessing the system's health and that could be applied in decision making. This paper focuses mainly on benthic community-based, biotic indices. We supply a general overview of several indices premises and assumptions as well as their main advantages and disadvantages. Furthermore, an illustrative example is provided of a straightforward application of benthic index of biotic integrity and benthic condition index. As a reference, their performance is compared to the Portuguese-benthic assessment tool. Limitations of the tested indices are discussed in context of the Mondego estuary (Portugal) case study.; http://www.sciencedirect.com/science/article/B6W87-4S38C07-1/1/8a495b1458d35c6ecf614eab10816ca3

Avaliação da comunidade de macroinvertebrados aquáticos como ferramenta para o monitoramento de um reservatório na bacia do rio Pitangui, Paraná, Brasil; Evaluation of the aquatic macroinvertebrate community as a tool for monitoring a reservoir in the Pitangui river basin, Paraná, Brazil

BARBOLA, Ivana F; MORAES, Marcos F. P. G; ANAZAWA, Tathiane M; NASCIMENTO, Elynton A; SEPKA, Everton R; POLEGATTO, Cleber M; MILLÉO, Julianne; SCHÜHLI, Guilherme S
Fonte: Fundação Zoobotânica do Rio Grande do Sul Publicador: Fundação Zoobotânica do Rio Grande do Sul
Tipo: Artigo de Revista Científica
POR
Relevância na Pesquisa
36.38%
Os macroinvertebrados bentônicos e nectônicos representam elementos importantes na estrutura e funcionamento dos ecossistemas aquáticos e sua distribuição é influenciada pela natureza química do substrato, composição da vegetação e profundidade da lâmina d'água. O conhecimento desta fauna contribui para a avaliação da qualidade da água e a elaboração de ações visando à conservação da biodiversidade. No presente estudo foram avaliadas diferentes medidas bióticas da comunidade de invertebrados da represa de Alagados, importante manancial da cidade de Ponta Grossa, no Paraná. Em cinco diferentes pontos de amostragem, foram coletados 18.473 exemplares de macroinvertebrados aquáticos ou semi-aquáticos, pertencentes a 46 táxons dos filos Annelida (Hirudinea e Oligochaeta), Mollusca (Gastropoda), Platyhelminthes (Turbellaria), Nematoda e Arthropoda (Arachnida, Crustacea e Insecta). Esta comunidade foi constituída predominantemente por organismos predadores (45,7% dos táxons amostrados), seguidos de coletores e/ou filtradores (23,9%); raspadores (15,2%), fragmentadores (13%) e detritívoros (2,2%). De modo geral, os índices de diversidade (H') e equitabilidade (J) foram significativamente baixos para os cinco locais investigados...

Ecological quality assessment in transitional systems; Avaliação do estado de qualidade ecológica em sistemas de transição

Lopes, Marta Filipa Lobão
Fonte: Universidade de Aveiro Publicador: Universidade de Aveiro
Tipo: Tese de Doutorado
ENG
Relevância na Pesquisa
36.49%
Estuaries are poles of attraction for human settlement which is a source of pressures to surface water bodies. The implementation of the European Water Framework Directive (WDF, 2000/60/EC) has increased the investigation in order to develop methodologies to assess the Ecological Quality Status (EQS) of aquatic ecosystems. Transitional systems are naturally stressed and characterized by highly dynamic physical, chemical and hydro-morphologic conditions and by species with a higher level of tolerance to change, being more difficult to develop suitable quality indicators for these systems. The general purpose of this study is to test the ability of synthesis descriptors, including primary (S, taxa richness) and derived biological variable (H’, Shannon-Wiener diversity), biotic indices (AMBI and M-AMBI), body size properties (abundance distribution by body size classes, length, weight and length-weight relationships) and non-taxonomic indices (ISS), as well as functional indicators related to the decomposition rates of various experimental substrates, a macrophyte (Phragmites australis) and an alga (Fucus vesiculosus), to evaluate the environmental quality in transitional systems. This study was carried out in one of the most pristine channels of the Ria the Aveiro...

Application of water quality biological indices using diatoms as bioindicators in the Gravataí river, RS, Brazil

Salomoni,SE.; Rocha,O.; Hermany,G.; Lobo,EA.
Fonte: Instituto Internacional de Ecologia Publicador: Instituto Internacional de Ecologia
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/11/2011 EN
Relevância na Pesquisa
46.13%
The Gravataí river situated in the metropolitan region of Porto Alegre has an area of approximately 2.020 km² and provides public water supply to about 500,000 inhabitants in 5 municipalities (latitude 29° 45'-30° 12' S; longitude 50° 27'-51° 12' W). The river basin has two regions with distinctive characteristics of occupation: the upper course shows intensive farming and the lower course presents urban and industrial uses. In this context, the aim of this study was to evaluate the water quality in the Gravataí River (RS, Brazil) by using physical, chemical and microbiological variables, and the water quality biological indices (WQBI) formulated for southern Brazilian rivers based on epilithic diatom communities as indicators. For comparison purposes, a local WQBI, called the Gravataí WQBI, was also used where species were given new saprobic values (s) and indicative values (vi) according to their occurrence and abundance in the river, using multivariate analytical techniques. The biological samples were taken every three months at six stations along the Gravataí River between September 2000 and August 2002. The results of the physical and chemical analyses of the water indicated a pollution gradient down the river, from the headwaters to the mouth...

A comparative analysis of biotic indices that use macroinvertebrates to assess water quality in a coastal river of Paraná state, southern Brazil

Gonçalves,Fábio Bertolini; Menezes,Márcia Santos de
Fonte: Instituto Virtual da Biodiversidade | BIOTA - FAPESP Publicador: Instituto Virtual da Biodiversidade | BIOTA - FAPESP
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/12/2011 EN
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Biotic indices to monitor water quality are helpful tools for evaluating the health of rivers and lakes. In Brazil water samples are mainly analyzed using physical and chemical attributes, because most biotic indices were developed in other countries and their effective application to Brazilian ecosystems requires significant research. This study compared four biotic indices commonly used to evaluate water quality via benthic macroinvertebrates in order to determine which index best reflects ecosystem health in a coastal river in Brazil's Paraná state. We also analyzed functional feeding groups. The indices studied were: 1) EPT (percent of Ephemeroptera, Plecoptera and Trichoptera); 2) BMWP' (Biological Monitoring Work Party System); 3) BMWP'-ASPT (Average Score per Taxon); and 4) HFBI (Hilsenhoff Family Biotic Index). All indices were calculated from five samples collected from April 2005 to April 2006 at two stations on the coastal do Pinto River. The river's headwaters are inside a protected area but impacts increase downriver (e.g., towns, cattle grazing, tourism). The HFBI index did the poorest job of reflecting water quality. No one index performed better than the others, and all indices yielded water quality scores that did not accurately reflect macroinvertebrate community structure because all of them had differences between ordination scores and the structure of assemblage. The functional feeding groups protocol classified the lower stretch of the river as disturbed due to human impacts...

The Andean Biotic Index (ABI): revised tolerance to pollution values for macroinvertebrate families and index performance evaluation

Ríos-Touma,Blanca; Acosta,Raúl; Prat,Narcís
Fonte: Revista de Biología Tropical Publicador: Revista de Biología Tropical
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/04/2014 EN
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Score-based biotic indices are widely used to evaluate the water quality of streams and rivers. Few adaptations of these indices have been done for South America because there is a lack of knowledge on macroinvertebrate taxonomy, distribution and tolerance to pollution in the region. Several areas in the Andes are densely populated and there is need for methods to assess the impact of increasing human pressures on aquatic ecosystems. Considering the unique ecological and geographical features of the Andes, macroinvertebrate indices used in other regions must be adapted with caution. Here we present a review of the literature on macroinvertebrate distribution and tolerance to pollution in Andean areas above 2 000masl. Using these data, we propose an Andean Biotic Index (ABI), which is based on the BMWP index. In general, ABI includes fewer macroinvertebrate families than in other regions of the world where the BMWP index has been applied because altitude restricts the distribution of several families. Our review shows that in the high Andes, the tolerance of several macroinvertebrate families to pollution differs from those reported in other areas. We tested the ABI index in two basins in Ecuador and Peru, and compared it to other BMWP adaptations using the reference condition approach. The ABI index is extremely useful for detecting the general impairment of rivers but class quality boundaries should be defined independently for each basin because reference conditions may be different. The ABI is widely used in Ecuador and Peru...