Consulta: subjectFacets:"Limnology"
Registros recuperados: 25
Data/hora: 13/06/2024 04:01:08

The Crimean hypersaline lakes: towards development of scientific basis of integrated sustainable management
Provedor de dados: 13
Autores: Shadrin, N.
There are a lot of saline/hypersaline lakes of marine and continental origin in the Crimea (Ukraine). Both types of lakes were studied during 9 years. This paper presents main results of that study showing general abiotic and biotic peculiarity of two types of lakes. In paper also there are conclusions, which are important for their sustainable use of these lakes under climatic changes.
Tipo: Conference Material
Palavras-chave: Saline/hypersaline lake; Limnology; Crimea; Ukraine.
Ano: 2009
URL: http://repository.ibss.org.ua/dspace/handle/99011/1950

Aporte de nutrientes e sólidos suspensos no Rio Taquari.
Provedor de dados: 14
Autores: OLIVEIRA, M. D. de; CALHEIROS, D. F.
A agricultura intensiva, pastagens cultivadas, garimpo, agroindústria e os efluentes urbanos estão entre os principais fatores que causam alterações ambientais no Pantanal e rios associados (Ferreira et. al., 1994). Estas atividades estão concentradas principalmente nas áreas de planalto e têm gerado aumentos no aporte de nutrientes e sedimentos para a planície. Um bom exemplo, é rio Taquari, um dos maiores tributários da bacia do alto rio Paraguai (Brasil; 1997). A bacia hidrográfica do rio Taquari está localizada entre as latitudes de 17°00'00''S e 20°00'00''S e as longitudes de 53°00'00''W e 58°00'00''W, abrangendo uma área de aproximadamente 65.023 km2, dentro da bacia do Alto Paraguai (BAP). No fim do alto curso, o rio Taquari recebe o rio Coxim com...
Tipo: Circular Técnica (INFOTECA-E)
Palavras-chave: Assoreamento; Sólido suspenso; Característica; Rio Taquari; Sediment; Nutrient; Characteristic; Taquari river.; Água; Limnologia; Nutriente; Sedimento.; Limnology; Water.
Ano: 2002
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/810732

Alteracoes limnologicas no Rio Paraguai ("dequada") e o fenomeno natural de mortandade de peixes no Pantanal Mato-Grossense - MS.
Provedor de dados: 14
Autores: CALHEIROS, D. F.; FERREIRA, C. J. A.
No Pantanal, ocorre um fenomeno natural de deterioracao da qualidade da agua, denominado regionalmente como "Dequada", relacionado a decomposicao da grande massa de materia organica submersa no inicio do processo de inundacao. Sua magnitude e dependente das caracteristicas do pulso de inundacao, ou seja, caracteristicas da fase de seca anterior e do periodo de inundacao subsequente (volume e velocidade). De acordo com essa magnitude, pode provocar mortandade massiva de peixes (podendo alcancar a ordem de milhares de toneladas), docorrente da deplecao de oxigenio e do aumento da concentracao de gas carbonico, resultantes dos processos de oxidacao da materia organica, tanto nos campos inundados, quanto na coluna d'agua dos rios. Os peixes moribundos...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Dequada; Mortandade; Rio Paraguai; Mato Grosso do Sul; Brasil; Kills.; Limnologia; Peixe.; Brazil; Paraguay River; Pantanal; Fish; Limnology; Mortality.
Ano: 1996
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/792189

Qualidade da água em corpos d'água urbanos das cidades de Corumbá e Ladário e no Rio Paraguai, MS.
Provedor de dados: 14
Autores: OLIVEIRA, M. D. de; CALHEIROS, D. F.; SANTOS, M. B. F.; COSTA, M. S.; BARBOSA, D. S.
O rio Paraguai é a principal fonte de abastecimento de água para as comunidades urbanas das cidades de Corumbá e Ladário, Estado de Mato Grosso do Sul. Suas águas são utilizadas, após tratamento convencional, para higiene, preparo de alimentos, lazer, irrigação de hortaliças, etc.. Nas cidades de Corumbá e Ladário, a situação do saneamento é caracterizada como crítica, pois não existe rede de esgoto doméstico, nem sistemas de tratamento. O esgoto é destinado principalmente para fossas sépticas, mas são comuns as ligações clandestinas em galerias pluviais e despejo direto em pequenos cursos d'água que drenam para o rio Paraguai. O mesmo ocorre no lado boliviano do sistema Laguna Cáceres - Canal do Tamengo, pertencentes à área de inundação do rio Paraguai,...
Tipo: Circular Técnica (INFOTECA-E)
Palavras-chave: Rio Paraguai; Corumbá; Ladário; Mato Grosso do Sul; Quality.; Água; Limnologia; Qualidade.; Limnology; Water.
Ano: 2002
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/810740

Estudos limnológicos para o monitoramento da bacia hidrográfica do Rio Miranda, Pantanal Sul.
Provedor de dados: 14
Autores: OLIVEIRA, M. D. de; FERREIRA, C. J.
Neste estudo foi monitorada a qualidade d?água da bacia hidrográfica do rio Miranda, interpretada quanto a parâmetros bióticos e abióticos, objetivando fornecer dados sobre as normais ambientais que ali prevalecem para determinar os fatores relevantes para as populações de peixes, para determinar épocas ou períodos sazonais críticos quanto à atuação desses fatores a fim de estabelecer bases e subsídios para a implantação de alerta e controle de acidentes ambientais. Foram amostrados o rio Miranda, de Guia Lopes da Laguna até o rio Salobra, e os rios Santo Antonio, Nioaque, Prata, Formoso, Aquidauana, Salobra, Vermelho e Abobral, no período de junho de 1987 a fevereiro de 1989. A variação espacial na bacia define 6 fácies hidrogeoquímicas: rio Aquidauana,...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Oxigênio dissolvido; Bacia do Rio Miranda; Quality; Dissolved oxygen and fish; Miranda river basin.; Água; Limnologia; Peixe; Qualidade.; Pantanal; Limnology; Water.
Ano: 2003
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/811104

Características e alterações limnológicas na Bacia do Rio Taquari, MS.
Provedor de dados: 14
Autores: OLIVEIRA, M. D. de; CALHEIROS, D. F.
Considerando os usos gerais dos principais sistemas aquáticos no Brasil, os impactos causados por processos de erosão/assoreamento são pontos importantes a serem considerados em programas de pesquisa, básica e aplicada, na área de Limnologia, devido a sua importância na alteração da qualidade da água.O aumento do aporte de material em suspensão, além de causar assoreamento dos rios, altera as características físicas e químicas da água, modificando a qualidade óptica da água e a temperatura (Alabaster &amp; Lloyd, 1982). O sedimento em suspensão pode aderir à superfície dos ovos de peixes, impedindo as trocas de oxigênio e dióxido de carbono, aderir às brânquias e prejudicar as funções de respiração e excreção, e depositar-se cobrindo plantas e locais de...
Tipo: Circular Técnica (INFOTECA-E)
Palavras-chave: Alteração; Característica; Assoreamento; Impacto; Rio Taquari; Characteristic; Sedimentation; Impact; Taquari river.; Água; Limnologia.; Pantanal; Limnology; Water.
Ano: 2002
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/810731

Perspectivas de estudos ecologicos sobre o Pantanal.
Provedor de dados: 14
Autores: CALHEIROS, D. F.; FONSECA JUNIOR, W. C. da, org.
Este trabalho originou-se das discussoes realizadas no "Curso de Ecologia de Areas Alagaveis", ministrado pelo Dr. Wolfgang J. Junk, do Max-Planck Institute fur limnologie - Alemanha e pela Dra Carolina Joana da Silva do Departamento de Biologia da Universidade Federal de Mato Grosso (Cuiaba), em agosto de 1991, no Centro de Pesquisa Agropecuaria do Pantanal - EMBRAPA/CPAP. Sua leitura leva ao entendimento de que, aprofundando-se os conhecimentos e reunindo-se as informacoes, e possivel formar uma base tecnico-cientifica solida para que acoes de manejo possam ser encontradas na regiao dentro dos principios do desenvolvimento sustentavel. Reeditado de forma ampliada quatro anos depois da realizacao daquele evento, este documento foi elaborado em duas partes...
Tipo: Documentos (INFOTECA-E)
Palavras-chave: Estudo; Recursos pesqueiros; Hidrology.; Clima; Ecologia; Fauna; Flora; Hidrologia; Limnologia; Solo.; Pantanal; Climate; Ecology; Limnology; Soil.
Ano: 1996
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/789744

Reproductive seasonality of Geophagus steindachneri Eigenmann &amp;amp; Hildebrand, 1922 (Perciformes: Cichlidae) in a tropical mountain river
Provedor de dados: 83
Autores: Rangel-Serpa,Federico; Torres,Mauricio.
Reproductive seasonality in tropical freshwater fishes is strongly influenced by rainfall. In lowlands, floods spill laterally to floodplains and fishes usually breed during the flooding season. In mountain rivers, floods are sudden and flush out aquatic organisms. Fishes in mountain rivers usually breed during dry seasons, what has been hypothesized as a strategy to reduce mortality due to strong floods. If that is the case, mouth-brooding fishes should suffer less from strong floods and should have more prolonged breeding seasons in mountain rivers. Here we investigated the breeding activity of a mouth-brooding cichlid (Geophagus steindachneri) in a mountain river in Colombia using three kinds of evidence: monthly variation of gonad weight, macroscopic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Limnology; Parental care; Phenology; Rainfall; Spawning.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252015000200421

Recent trends in research on Lake Victoria fisheries. Proceedings of the Second EEC Regional Seminar on Recent Trends of Research on Lake Victoria Fisheries, organized and hosted by Kenya Marine and Fisheries Research Institute (KMFRI), 25-27 September 1991, Kisumu, Kenya
Provedor de dados: 20
Autores: Okemwa, E.; Wakwabi, E.; Getabu, A.
Topics on Lake Victoria limnology, benthic fauna, stock assessment, catch assessment survey, gear selectivity, fisheries ecology, fish parasites and marketing economics are covered. Management and conservation of the lake's fisheries and other aquatic resources are discussed. Dialogue between fishermen, scientists and administrators is stressed, measures to be undertaken are addressed and further research is recommended.
Tipo: Proceedings Paper
Palavras-chave: Fishery management; Freshwater fish; Inland fisheries; Lake fisheries; Limnology; Resource management; Stock assessment; Zoobenthos; Fishery management; Lake fisheries; Limnology; Stock assessment; Inland fisheries; Resource management; Zoobenthos; Http://aims.fao.org/aos/agrovoc/c_24026; Http://aims.fao.org/aos/agrovoc/c_4159; Http://aims.fao.org/aos/agrovoc/c_4343; Http://aims.fao.org/aos/agrovoc/c_24251; Http://aims.fao.org/aos/agrovoc/c_3873; Http://aims.fao.org/aos/agrovoc/c_6524; Http://aims.fao.org/aos/agrovoc/c_15487.
Ano: 1994
URL: http://hdl.handle.net/1834/2125

Caracterização e distribuição do fitoplâncton na zona norte da costa angolana em Agosto de 2002
Provedor de dados: 20
Autores: Paulo André de Sousa Coelho.
Instittuto  Nacional de Investigaçao  Pesqueira, INIP, luanda , Angola
Tipo: Theses and Dissertations
Palavras-chave: Phytoplankton; Nanoplankton; Biology; Limnology; Algae.
Ano: 2007
URL: http://hdl.handle.net/1834/5345

Hacia una cuantificación de estrés ecológico en el embalse de Rincón del Bonete (Uruguay)
Provedor de dados: 20
Autores: Amestoy, F.J.
La presente tesis respondió preguntas importantes para el conocimiento del embalse de Rincón del Bonete (EdRB) y para la obtención de los puntos de referencia para la determinación de estrés ecológico en el mismo. Los objetivos específicos comprendieron la determinación de los aspectos limnológicos más relevantes, la caracterización del embalse según su estado trófico, así como el conocimiento del estado de explotación de la especie íctica mas relevante desde el punto de vista comercial. Se determinaron indicadores que permitieron aportar información de base para cuantificar el grado de perturbación del embalse a fin de adoptar estrategias de conservación y manejo, así como definir las zonas más sensibles de impacto ambiental. Se evaluó la variabilidad...
Tipo: Theses and Dissertations
Palavras-chave: M40; Limnology; Environmental monitoring; Artificial lakes; Resource conservation; Ecological balance; Indicators; Echo surveys; Freshwater lakes; Experimental fishing; Biomass; Limnology; Environmental monitoring; Biomass; Artificial lakes; Resource conservation; Ecological balance; Http://aims.fao.org/aos/agrovoc/c_4343; Http://aims.fao.org/aos/agrovoc/c_37876; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_8961; Http://aims.fao.org/aos/agrovoc/c_6523; Http://aims.fao.org/aos/agrovoc/c_34928.
Ano: 2001
URL: http://hdl.handle.net/1834/2611

An assessment of the factors determining rotifer assemblage in river-lake systems: the effects of seasonality and habitat
Provedor de dados: 103
Autores: Serafim-Júnior,Moacyr; Perbiche-Neves,Gilmar; Lansac-Tôha,Fabio A.
ABSTRACT Zooplankton exhibit several trends of variation in space and time, and these trends can be more evident in natural environments without anthropic perturbations. Examples of anthropic factors are climate change, eutrophication and construction of reservoirs. This study evaluated the influence of three factors - seasonality, type of environment and the presence of aquatic macrophytes - on various ecological attributes of rotifers in a river-lake system located in the Paraná River floodplain. Monthly samplings were conducted during 1993 and 1994. The mean species richness per sample was 60 species. The seasonality and the type of environment influenced the ecological attributes of rotifer assemblages, while the presence or absence of aquatic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ecology; Limnology; Rotifera; Upper Paraná River floodplain.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702019000100305

Variability of δ13C and δ15N in three zooplankton species from the Upper Paraná River floodplain
Provedor de dados: 103
Autores: Santana,Ana R. A.; Lansac-Tôha,Fabio Amodêo; Benedito,Evanilde.
This study evaluated the isotopic composition of three zooplankton species - Notodiaptomus amazonicus (Wright, 1935), Moina minuta Hansen, 1899 and Bosmina hagmanni Stingelin, 1904 - from the Upper Paraná River floodplain. We predicted that there would be isotopic variability among species in the different sampled environments. Samplings were conducted in three lakes from the Baía subsystem and in two lakes from the Paraná subsystem. At each location, some abiotic variables were measured, and zooplankton (3 to 4) and phytoplankton (3) samples were taken. The species sampled did not present significant differences between subsystems; however, they were different among the lakes, with variations of about 10.8‰ for δ13C and 5.8‰ for δ15N. The isotopic values...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Food web; Limnology; Phytoplankton; Energy; Stable isotopes.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702009000400017

Finding patterns of distribution for freshwater phytoplankton, zooplankton and fish, by means of parsimony analysis of endemicity
Provedor de dados: 97
Autores: OYANEDEL,J. PABLO; VEGA-RETTER,CAREN; SCOTT,SERGIO; HINOJOSA,LUIS FELIPE; RAMOS-JILIBERTO,RODRIGO.
During the last decades, limnological studies on Chilean systems have contributed to know the species composition and main environmental variables of many water bodies distributed over a wide latitudinal interval, from 18º to 53º S. However, we still lack of a comprehensive view about the structure and functioning of regional freshwaters. In this work we review the available information about pelagic biota from Chilean basins, in order to reveal patterns of species distribution and their possible association with environmental variables. We built presence-absence matrices for phytoplankton, zooplankton and fish over lakes and basins. From this database, we performed parsimony analysis of endemicity as a tool for determining fundamental distribution...
Tipo: Journal article
Palavras-chave: Limnology; Lakes; Plankton; Biogeography; Chile; CCA.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2008000200004

A note on the seasonally shifting zone of high primary production in the Bay of Marajó, Pará, Brazil, 1983-1984
Provedor de dados: 39
Autores: Schwassmann,H.O; Barthem,R.B; Carvalho,M.L.
To understand the hydrological and limnological conditions during the annual regime of high and low river flow, as well as the action of the tides, a series of 18 collecting trips were conducted in monthly and bimonthly intervals across the Bay of Marajó during the years 1983-1985. The Tocantins River provides more than 80% of the inflow into this bay and shows a much greater difference in water volume flow between high and low water season than the Amazon. The annual displacement of brackish water influence is thus more extensive Marajó Bay than in the Amazon estuary. During the dry season of low river discharge (September-December), traces of seawater are found to penetrate up to 90 km upriver in the Guamá River. The high degree of turbidity of inner...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Limnology; Amazon Estuary; Tidal Rivers; Estuary Hydrodynamics; Phytoplankton.
Ano: 1988
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33061988000300014

Growth performance of Nile tilapia, Oreochromis niloticus, fingerlings reared in Na2CO3 limed waters - doi: 10.4025/actascianimsci.v32i3.8510
Provedor de dados: 2
Autores: Cavalcante, Davi de Holanda; Universidade Federal do Ceará; Barros, Renan Loiola; Universidade Federal do Ceará; Sá, Marcelo Vinícius do Carmo e; UFC.
Current experiment was undertaken during 6 weeks with Nile tilapia, Oreochomis niloticus, fingerlings (1.28 &amp;plusmn; 0.03 g) to assess the effects of moderate Na2CO3 liming on water quality and fish growth performance. Twenty-four 25 L-aquaria, with 15 fish per aquarium, were used, of which twelve aquaria were placed in the lab’s indoor room and twelve in the outdoor area. Two types of water (clear or green) and three different water-quality managements (none, HCl acidification and Na2CO3 liming) were simultaneously evaluated in a 3 x 2 factorial design. Total ammonia, calcium hardness, pH and total alkalinity in the green water aquaria were significantly higher than rates in the clear water aquaria. Slight liming acid water with Na2CO3 did not produce...
Palavras-chave: Fish culture; Limnology; Water alkalinity; Water hardness fish culture; Limnology; Water alkalinity; Water hardness.
Ano: 2010
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/8510

Association between periphyton and bioflocs systems in intensive culture of juvenile Nile tilapia
Provedor de dados: 2
Autores: Cavalcante, Davi de Holanda; Lima, Francisco Roberto dos Santos; Rebouças, Vanessa Tomaz; Sá, Marcelo Vinícius do Carmo e.
The present work aimed at determining the effects of the association between the periphyton-based system with the bioflocs-based system in the intensive culture of juvenile Nile tilapia (1.56 ± 0.07 g; 72 fish m-3), on variables of water quality, growth performance and effluent quality after 10 weeks. The experiment was arranged in a 2 x 2 factorial randomized block design with four treatments and five repetitions each. The factors tested were the following: ‘underwater structure’ (absence and presence) and ‘adjustment of the C: N ratio of water’ (no and yes). The final fish body weight, specific growth rate and yield were higher (p &lt; 0.05) in the C: N-adjusted tanks. The presence of submerged structures in the tanks had no significant influence on...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Piscicultura; Tilápia aquaculture; Oreochromis; Limnoculture; Limnology.
Ano: 2016
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/27592

Effects of CaCO3 liming on water quality and growth performance of fingerlings of Nile tilapia, Oreochromis niloticus - DOI: 10.4025/actascianimsci.v31i3.6263
Provedor de dados: 2
Autores: Cavalcante, Davi de Holanda; UFC; Poliato, Alexandro de Sousa; UFC; Ribeiro, Diego Castro; UFC; Magalhães, Frederico Batista; UFC; Sá, Marcelo Vinícius do Carmo e; UFC.
The present study was carried out for 6 week with Nile tilapia, Oreochomis niloticus, fingerlings (0.77 &amp;plusmn; 0.04 g) to assess the effects of moderate CaCO3 liming on water pH, total alkalinity, calcium hardness, free CO2 and total ammonia, as well as on fish final body weight, final body length, survival and FCR. Eighteen 25-L polyethylene aquaria were used to hold the experimental fish (15 fish per aquarium). Nine aquaria were set in the lab’s indoor room and nine aquaria in its outdoor area. Two types of water (clear or green) and three different water quality managements (none, HCl acidification and CaCO3 liming) were evaluated simultaneously in a 3 x 2 factorial design. The application of analytical calcium carbonate at 1 g 10 L-1 in the clear...
Tipo: Bioensaio em laboratório
Palavras-chave: 5.04.05.02-0 fish culture; Limnology; Water alkalinity; Water hardness Manejo de animais.
Ano: 2009
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/6263

Distribuição vertical da comunidade fitoplanctônica do lago dos Tigres (Goiás, Brasil) - DOI: 10.4025/actascibiolsci.v30i1.1446
Provedor de dados: 3
Autores: Nabout, João Carlos; UFG; Nogueira, Ina de Souza; UFG.
O lago dos Tigres é um lago do tipo vale bloqueado, sendo que não foi registrado estudo evidenciando a distribuição vertical fitoplanctônica para esse tipo de lago; dessa forma, esta pesquisa assume um caráter pioneiro. Objetivou-se, nesse trabalho, o reconhecimento temporal e espacial dos padrões verticais de atributos da comunidade fitoplanctônica, detectar os grupos funcionais fitoplanctônicos dominantes e descritivos do sistema e relacioná-los com características limnológicas. O lago estudado foi caracterizado como polimítico quente, sendo que ocorreram eventuais estratificações térmicas nas estações de maior profundidade. Os períodos de seca e início de chuva apresentaram-se tanto limnologicamente (evidenciado pela ACP) quanto biologicamente...
Palavras-chave: 2.01.00.00-0 Biologia Geral distribuição vertical; Fitoplâncton; Limnology; Vale bloqueado 2.01.00.00-0 Biologia Geral.
Ano: 2008
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/1446

Estado trófico e bioacumulação do fósforo total no cultivo de peixes em tanques-rede na área aqüícola do reservatório de Itaipu - DOI: 10.4025/actascibiolsci.v30i3.519
Provedor de dados: 3
Autores: Bueno, Guilherme Wolff; Unioeste; Marengoni, Nilton Garcia; Unioeste- Marechal Cândido Rondon; Gonçalves Júnior, Affonso Celso; Unioeste- Marechal Cândido Rondon; Boscolo, Wilson Rogério; Unioeste- Toledo; Teixeira, Rodrigo de Almeida; UEPG- Ponta Grossa.
A intensa produção de peixes e uso dos recursos hídricos pode comprometer a qualidade e disponibilidade da água, além de afetar a capacidade de suporte do ambiente, causando eutrofização e conseqüentemente a poluição do mesmo. Realizou-se um estudo das variáveis físico-químicas da água e dos teores de fósforo total (P-total) no sedimento, rações e peixes cultivados em tanques-rede em uma área aqüícola localizada no reservatório da Itaipu, no município de Santa Helena – PR, objetivando monitorar a qualidade da água e determinar o índice de eutrofização total da área de cultivo, além de analisar a bioacumulação de P-total nos peixes e sedimento. As variáveis físico-químicas da água mantiveram valores normais indicados pelo CONAMA. A concentração média de...
Palavras-chave: 2.00.00.00-6 Ciências Biológicas Aqüicultura sustentável; Área aqüícola; Efluentes; Impacto ambiental; Limnologia. sustainable aquaculture; Aquaculture area; Effluent; Environment impact; Limnology.
Ano: 2008
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/519

Colonization of benthic invertebrates on artificial and natural substrate in a Neotropical lotic environment in Southern Brazil
Provedor de dados: 3
Autores: Camargo, Nilce Svarcz Jungles de; Lehun, Atsler Luana; Rosa, Jonathan; Bueno-Krawczyk, Ana Carolina de Deus.
The objective of this research was to validate the colonization process on natural and artificial substrates by benthic invertebrates in a tropical stream in South Brazil. The samples were performed in July and August-2012, and 32 samplers were used, being 16 natural and 16 artificial substrates. In each sample, two replicas were taken for each substrate at the 2th, 4th, 7th, 14th, 21th 28th, 35th and 42th days of colonization. The organisms were identified to the lowest possible taxonomic level. In both substrates 3,070 benthic invertebrates were detected, of which 1,753 individuals were collected on the natural substrate, and 1,317 on the artificial substrate. From the identified taxa 8.5% were not dominant (Anacroneuria, Orthocladiinae, Tupiara,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Community structure; Diversity; Tropical stream; Limnology; Simulium. Community structure; Diversity; Tropical stream; Limnology; Simulium.
Ano: 2019
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/45872

Cd, Cu, and Mn from Uruguay River Basin in Uruguaiana, RS, Brazil, and their toxicological potential for human leukocyte
Provedor de dados: 3
Autores: Costa, Gislaine Rezer; Rocha, Mariana Balhego; Querol, Marcus Vinicius Morini; Dal Magro, Jacir; Machado, Michel Mansur; Oliveira, Luís Flávio Souza de.
This study assessed the limnology from the Medium Uruguay River Basin in Uruguaiana, Brazil, with a focus on the concentration of heavy metals (Cd, Cu, and Mn), to assess the toxicological potential (cytotoxicity and genotoxicity) for humans using as biological matrix of study human leukocyte cells. The conductivity, resistivity, and dissolved O2 levels exceeded the limits recommended by the National Environmental Council (Conselho Nacional do Meio Ambiente - CONAMA). The percentage of non-viable human leukocyte cells exposed to water samples was approximately 20% higher than that of the negative control (&lt;3%), but similar to the positive control. The DNA damage index was high for all heavy metal concentrations assayed when compared to the negative...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: 2.00.00.00-6 ecotoxicology; Genotoxicity; Limnology; Heavy metals; Uruguay River Basin Ecotoxicologia.
Ano: 2016
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/31998

Morphology and morphometry of upland lakes over lateritic crust, Serra dos Carajás, southeastern Amazon region
Provedor de dados: 42
Autores: SILVA,MARCIO S. DA; GUIMARÃES,JOSÉ T.F.; SOUZA FILHO,PEDRO W.M.; NASCIMENTO JÚNIOR,WILSON; SAHOO,PRAFULLA K.; COSTA,FRANCISCO R. DA; SILVA JÚNIOR,RENATO O.; RODRIGUES,TARCÍSIO M.; COSTA,MARLENE F. DA.
ABSTRACT High-resolution satellite images, digital elevation models, bathymetric and sedimentological surveys coupled with statistical analysis were used to understand the physical environment and discuss their influence on water quality of the five upland lakes of Serra Sul dos Carajás, southeast Amazonia. The lakes have mid-altitude ranges (elevation), very small (catchment) and shallow to very shallow (central basins). Based on the length, area and volume, Violão and TI (Três Irmãs)-3 lakes may present large vertical movements of the water due to wind action and weakly stratified waters. Trophic conditions based on depth and shore development (Ld) parameters must be used with caution, since Amendoim Lake is relatively deep, but it is oligotrophic to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lateritic crust; Lakes; Limnology; Geomorphology; Amazon region; Carajás.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000401309

Relationship between space distribution of the benthic macroinvertebrates community and trophic state in a Neotropical reservoir (Itupararanga, Brazil)
Provedor de dados: 49
Autores: Beghelli,Frederico Guilherme de Souza; Santos,André Cordeiro Alves dos; Urso-Guimarães,Maria Virgínia; Calijuri,Maria do Carmo.
The purpose of this work was to verify the benthic macroinvertebrates community responses through environmental factors along a headwater tropical reservoir. Samplings were taken with a Van-Veen grab along the reservoir in littoral and profundal regions and in the headwater, next to the dam and the middle of the reservoir. Samples were taken during both wet and dry seasons. Dissolved oxygen concentrations, electric conductivity, temperature and pH near the sediment have been performed in situ, at every sampling station by using a multiprobe and Secchi disc. Total water phosphorus and chlorophyll a concentrations were analyzed to determine the trophic state index. Sediment's organic matter, total phosphorus, nitrogen concentrations and granulometric...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Benthos; Chironomidae; Limnology; Bioindicator; Water quality.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032012000400012

Zooplankton community composition and some limnological aspects of an oxbow lake of the Paraopeba River, São Francisco River Basin, Minas Gerais, Brazil
Provedor de dados: 52
Autores: Sampaio,Edson Vieira; López,Cristiane Machado.
Some limnological aspects of Lake Massacará (adjoining the Paraopeba River, São Francisco River Basin) were studied during two periods of the hydrological cycle. Water transparency was equally low during both the periods. During high water, thermal stratification was recorded, with a clinograde oxygen profile; pH was slightly acid, and conductivity was higher near the bottom. Concentrations of inorganic carbon and ammonia, and rates of primary production were higher than during the low water period. During the latter period, complete mixing occurred, with a clinograde oxygen profile; pH was slightly acid, and conductivity unvarying with depth. Higher concentrations of nitrate were found than during high water. With regard to the zooplankton communities,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oxbow lake; Limnology; Zooplankton; Paraopeba River; São Francisco River Basin; Brazil.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132000000300007