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| Registros recuperados: 55 | |
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| Cunha,Elane Domênica de Souza; Cunha,Alan Cavalcanti da; Silveira Jr,Arialdo Martins da; Faustino,Silvia Maria Mathes. |
| During the various hydrological periods in 2011, we studied the phytoplankton along an 87-km stretch of the Araguari and Falsino rivers, which are located in the eastern Brazilian Amazon, in the state of Amapá, Brazil, the most ecologically preserved state in the country. In the study area, the aquatic ecosystem is under pressure from human activities such as, mining, hydroelectric power generation and urbanization, which contrast with the surrounding areas that are designated for biodiversity conservation. The aim of this study was to characterize the composition, frequency and richness of algae species and also to identify spatial-temporal patterns of taxa distribution. During the study period, we identified 185 taxa (136 species in 49 genera). The... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Algae; Amapá; Floristic survey; Reservoir; River. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062013000200011 |
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| Chaves, Francisco Ítalo Barbosa; Universidade Federal do Ceará/Aluno de doutorado; Lima, Paulo de Freitas; Universidade Federal do Ceará; Leitão, Renato Carrhá; Embrapa Agroindústria Tropical; Paulino, Walt Disney; Companhia de Gestão de Recursos Hídricos do Estado do Ceará; Santaella, Sandra Tédde; Universidade Federal do Ceará. |
| This study evaluated the trophic conditions of the reservoir located in the urban perimeter of the town General Sampaio, semiarid region of the Ceará State, Brazil and its relationship with seasonal variation in rainfall between 2010 and 2011. It was obtained data for Secchi disk transparency, total phosphorus, and chlorophyll a to calculate the Trophic State Index (TSI), as well as rainfall data. The Trophic State Index (TSI) proposed by Carlson (1977) and modified by Toledo Junior (1990) was used to test the influence of the seasonal variation in rainfall on hydrological variables and on trophic conditions of the reservoir in 2010 and 2011. There was seasonal variability in variables analyzed between climatic periods (rainy and dry) and trophic... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: 2.05.02.00-1 Brazilian semiarid; Reservoir; Trophic state index ECOLOGIA DE ECOSSISTEMAS. |
| Ano: 2013 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/18261 |
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| Jorge, Monica Bueno; Vilela, Maria José Alencar; Suarez, Yzel Rondon; Lima Junior, Sidnei Eduardo. |
| Changes in diet of Laetacara araguaiae Ottoni and Costa, 2009 were evaluated in the Sucuriú River (Upper Paraná basin, Brazil) in an area with a small hydroelectric power plant, both before and after the formation of the reservoir, in order to answer: Did the construction of the reservoir affected the diet of this species? The results showed greater change of diet composition in the upstream section of the reservoir. It was observed that before the formation of the reservoir and the first year after, the individuals from upstream section formed a group characterized by an insectivorous diet. With the dam construction and habitat change we observed that aquatic plant material, sediment, and algae predominated in the diet. These results show the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: 2.00.00.00-6 aquatic ecology; Environmental impacts; Laetacara araguaiae; Reservoir; Upper Paraná River; Brazil. Ecologia. |
| Ano: 2019 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/43880 |
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| Bessa, Gisele Fernandes; Universidade Federal do Tocantins; Vieira, Ludgero Cardoso Galli; Universidade de Brasília; Bini, Luis Mauricio; Universidade Federal do Goiás; Reis, Deusiano Florêncio dos; Universidade Federal do Tocantins; Morais, Paula Benevides de; Universidade Federal do Tocantins. |
| The goal of this study was to evaluate the concordance amongst three zooplankton groups (Rotifera, Cladocera, and Copepoda) and between the zooplankton groups and the environmental variables in the Luis Eduardo Magalhães reservoir, in the Mid-Tocantins River, Tocantins State, Brazil. Concordance patterns were found in relation to environmental variables, cladocerans, and rotifers, although values were relatively low. These results indicate that one should be cautious about the use of indicative taxonomic groups to detect environmental changes, where divergent results annul extrapolation possibilities and indicate the existence of distinct environmental factors controlling different groups. |
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Palavras-chave: 2.05.02.00-1 Concordance; Reservoir; Rotífera; Cladocera; Copepoda 2.05.02.00-1 Concordance; Reservoir; Rotífera; Cladocera; Copepoda. |
| Ano: 2011 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/7336 |
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| Fonseca, Iraúza Arroteia; UEM; Siqueira, Natália Silveira; UEM; Rodrigues, Liliana; UEM. |
| Este trabalho objetivou analisar a riqueza e a abundância de algas perifíticas nos rios do Corvo e Guairacá, tributários do reservatório de Rosana, quando da instalação de tanques-rede. Acreditava-se que o ponto logo à frente dos tanques-rede apresentaria menor riqueza e abundância de algas e que o reservatório influenciaria as estações a jusante dos tanques. Para isso, coletas foram realizadas a montante, em frente e a jusante da instalação de tanques-rede. Independentemente do ambiente, a estação que apresentou maior riqueza foi 1.000 m a montante. Diminuição na riqueza foi verificada nas estações 500 m a montante e 500 m a jusante. Quanto à densidade, em frente aos tanques, observou-se maior abundância, seguida pela estação a 1.000 m a jusante. Já, nas... |
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Palavras-chave: Periphytic algae; Environmental monitoring; Reservoir; Net cage 2.00.00.00-6 Ciências Biológicas perifíton; Monitoramento ambiental; Aqüicultura; Estrutura de comunidade Ecologia. |
| Ano: 2009 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/2523 |
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| OLIVEIRA,FÁBIO H.P.C. DE; ARA,ANDRÉ L.S. CAPELA E; MOREIRA,CESAR H.P.; LIRA,OSMAN O.; PADILHA,MARIA DO ROSÁRIO F.; SHINOHARA,NEIDE K.S.. |
| This study investigated the water quality in an urban eutrophic reservoir in Northeastern Brazil, considering the influence of seasonality. Monthly, samples were collected in the sub-surface reservoir. The following abiotic variables were analyzed: temperature, pH, dissolved oxygen, apparent color, turbidity, conductivity, fluoride, total nitrogen, chlorides, total dissolved solids, total hardness, iron, copper, manganese, aluminum, chlorophyll-a and phaeophytin. Total and thermotolerant coliforms were analyzed according to APHA (2012). Cyanobacteria density was quantified through its biomass. The data were analyzed using one- way ANOVA and Pearson correlation test. Higher values mean phytoplankton biomass (26.3mm3.L–1) occurred in the dry season,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Coliforms; Cyanobacteria; Reservoir; Trophic state. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000401863 |
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| Marcondes,Carlos Brisola; Fernandes,Aristides; Müller,Gerson Azulim. |
| Anopheline and other mosquitoes (Diptera: Culicidae) in the southern Brazilian State of Santa Catarina have been studied mostly near the Atlantic sea coast and are not well known in other regions of the state. Collections were made near a reservoir in the western portion of the state. At least 26 species were represented in the collections; 10 are recorded for the first time for the state: Coquillettidia venezuelensis, Cq. juxtamansonia, Mansonia wilsoni, Ochlerotatus fluviatilis, Psorophora ciliata, Ps. discrucians, Ps. lanei, Culex bigoti, Sabethes belisarioi and Sa. identicus, and 12 for the first time in the western portion of the state: Anopheles albitarsis, An. intermedius, An. lutzi, An. parvus, An. strodei, Chagasia fajardi, Cx. quinquefasciatus,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Culicidae; Santa Catarina; Brazil; Anopheles; Psorophora; Reservoir; Dam. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032006000300014 |
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| Cunico,Almir Manoel; Agostinho,Angelo Antonio. |
| The aim of this study was to determine morphological patterns of the most abundant fish species found in reservoirs with different hydraulic retention times and stages of colonization, considering habitat strata and feeding strategies. Samplings were carried out in six Paraná State (Brazil) reservoirs, and morphological data were obtained from 15 individuals of 17 fish species. Ecomorphological attributes that best segregated species, were selected using Discriminant Analysis. These selected attributes were later used in a Principal Components Analysis (PCA). Differences among reservoirs concerning occupation of the ecomorphological space were tested through analysis of variance (null models). The six reservoirs differed in the occupation of the fish... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ecomorphology; Feeding strategies; Habitat; Reservoir. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132006000100015 |
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| Evangelista,Heloísa Beatriz Antoniazi; Thomaz,Sidinei Magela; Evangelista,Luiz Roberto. |
| In this work, a recently proposed diversity index based on Patil and Taillie parametric diversity measure (or Tsallis entropy), Sq*, was applied to samples (presence-absence data) of macrophytes from the Itaipu Reservoir, Brazil. This new index was the value of the family of indices Sq for a specific evenness of a sample. Results demonstrated that the Shannon index and species richness showed expressively high correlation with the Sq*; however, the evenness had low correlation coefficients with the index Sq*, indicating that Sq* was particularly sensitive to rarity and species richness. On the other hand, the weak correlations of this index with evenness demonstrated that it was less sensitive to species relative abundances. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Tsallis entropy; Macrophytes; Reservoir; Shannon; Simpson. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132012000200014 |
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| Registros recuperados: 55 | |
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