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Registros recuperados: 36
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The spiny rat Proechimys guyannensis (Rodentia: Echimydae) fails to respond to intradermal inoculation with Leishmania (Viannia) braziliensis Acta Amazonica
PASSOS,Stela Rechinelli; MADUREIRA,Ana Paula; ALMEIDA,Sayanne Luns Hatum de; ZANINI,Marcos Santos.
Leishmaniasis a disease of worldwide occurrence is caused by protozoa of the Leishmania genus. In Brazil, Leishmania (Viannia) braziliensis is the main parasite responsible for the American cutaneous leishmaniasis. Main hosts of this protozoa are small wild mammals particularly marsupials and rodents. The aim of this study was to evaluate if spiny rat Proechimys guyannensis (Rodentia: Echimydae) has role in the cycle of the American cutaneous leishmaniasis caused by L. (V.) braziliensis. Thus, promastigotes (the flagellate stage) of Leishmania (Viannia) braziliensis were used to inoculate seven spiny rats (Proechimys guyannensis). After inoculated intradermal at the ear pinna, nose and plantar pad, the rats were monitored for 180 days. Tissue samples...
Tipo: Info:eu-repo/semantics/other Palavras-chave: Leishmaniasis; American cutaneous leishmaniasis; Rodents; Reservoirs.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672015000200239
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Risk analysis in the spillway of dam Orós by excess of influent flow Anais da ABC (AABC)
Goes Filho,Adbeel.
This paper presents the practical application of concepts, and some methods of risk analysis, to check the possibility of overcoming a water level of project in the spillway of dam Orós, by excess of influent flow. Also evaluated the empirical formulas contained in the original design. Due to the difficulty of obtaining design data from the dam, since the end of construction date of January, 11, 1961, we minimize the effects of some variables in the calculations, leading us to the consequent simplification of the scenario under study. For a better evaluation and characterization of the setting, some variables in the model such as water level, accumulation and flow of the spillway, had updated their data to June 28, 2011. We have demonstrated the importance...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Risk analysis; Public dams; Reservoirs; Water resources management.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000100405
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Diversity of Odonata (Insecta) larvae in streams and farm ponds of a montane region in southern Brazil Biota Neotropica
Pires,Mateus Marques; Kotzian,Carla Bender; Spies,Marcia Regina; Neri,Damaris Battistel.
This study presents an inventory of the genera of Odonata found in streams and artificial farm ponds in a montane region, with temperate climate, in southern Brazil. Differences in richness of lotic and lentic environments were also investigated. The diversity of odonate families and genera in southernmost Brazil is lower than in warmer, either tropical or subtropical, regions of the country. Nine genera are new records for the region and six genera had their geographical ranges extended to regions with temperate climate of the Neotropics. The overall richness and especially the overall abundance recorded in the studied area are possibly determined by the occurrence of numerous farm ponds because natural standing waters are scarce in the region. The...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Dragonfly; Inventory; Neotropical region; Reservoirs; Riverine fauna.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032013000300259
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Ecological assessment of a southeastern Brazil reservoir Biota Neotropica
Martins,Isabela; Sanches,Barbara; Kaufmann,Philip Robert; Hughes,Robert M.; Santos,Gilmar Bastos; Molozzi,Joseline; Callisto,Marcos.
Reservoirs are artificial ecosystems with multiple functions having direct and indirect benefits to humans; however, they also cause ecological changes and influence the composition and structure of aquatic biota. Our objectives were to: (1) assess the environmental condition of Nova Ponte Reservoir, Minas Gerais state, southeastern Brazil; and (2) determine how the aquatic biota respond to disturbances. A total of 40 sites in the littoral zone of the reservoir were sampled to characterize physical and chemical habitat, land use, and benthic macroinvertebrate and fish assemblages. The predominant type of land cover near the reservoir was natural vegetation. A total of 29 fish species and 39 macroinvertebrate taxa were collected, including eight alien...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Reservoirs; Water quality; Bioindicators; Physical habitat; Environmental quality.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032015000100103
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Periphytic diatoms from an oligotrophic lentic system, Piraquara I reservoir, Paraná state, Brazil Biota Neotropica
Silva-Lehmkuhl,Angela Maria da; Tremarin,Priscila Izabel; Vercellino,Ilka Schincariol; Ludwig,Thelma A. Veiga.
Abstract: Knowledge of biodiversity in oligotrophic aquatic ecosystems is fundamental to plan conservation strategies for protected areas. This study assessed the diatom diversity from an urban reservoir with oligotrophic conditions. The Piraquara I reservoir is located in an Environmental Protection Area and is responsible for the public supply of Curitiba city and the metropolitan region. Samples were collected seasonally between October 2007 and August 2008. Periphytic samples were obtained by removing the biofilm attached to Polygonum hydropiperoides stems and to glass slides. The taxonomic study resulted in the identification of 87 diatom taxa. The most representative genera regarding the species richness were Pinnularia (15 species) and Eunotia (14...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Artificial substrate; Diatom ecology; Macrophytes; Reservoirs.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032019000200302
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Spatial heterogeneity of the Tucuruí Reservoir (State of Pará, Amazonia, Brazil) and the distribution of zooplanktonic species BJB
ESPÍNDOLA,E. L. G.; MATSUMURA-TUNDISI,T.; RIETZLER,A. C.; TUNDISI,J. G..
With the purpose of analyzing the horizontal distribution of the zooplankton community of the Tucuruí Reservoir in the State of Pará, Brazil, collections were made at 16 stations during August 1988. The stations cover the regions called Caraipé (C), Araçagi (B) and Ararão (A), and represent the different compartments of this ecosystem in regard to the morphometry and the presence or absence of "flooded forest". Our findings showed the existence of three compartments with different limnological characteristics determined as a function of the system's morphometry, a factor that may have influenced the horizontal circulation of the reservoir's water and, consequently, led to physical, chemical and biological differences at each of the sampled stations. All...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Zooplankton; Horizontal distribution; Spatial heterogeneity; Reservoirs.
Ano: 2000 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000200001
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Prediction of colonization by macrophytes in the Yaciretá reservoir of the Paraná River (Argentina and Paraguay) BJB
NEIFF,J. J.; POI DE NEIFF,A. S. G.; PATIÑO,C. A. E.; BASTERRA DE CHIOZZI,I..
The potential colonization by anchored plants (PCAP) and the potential areas for initial colonization of free floating plants were estimated during the early filling phase for the Yaciretá reservoir. In order to obtain the PCAP, the observed maximum depth of colonization of the anchored macrophytes before impoundment and the hypsographic curves were used. The species inhabiting the pre-impoundment area were classified according to the different bioforms before the inclussion in the analysis. The areal extent of PCAP (from depths between 0-4 m) could reach 275 km² at 76 m above sea level (current water level), whereas at 82 m above sea level (final filling level) the littoral zone will be increased by about 21.5%. The potential area for geophytes was...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Tropical rivers; Impounding reservoirs; South America; Potential macrophytes colonization; Reservoirs.
Ano: 2000 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000400011
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Arcobacter butzleri and A. cryaerophilus in human, animals and food sources, in southern Chile BJM
Fernandez,Heriberto; Villanueva,Maria Paz; Mansilla,Ingrid; Gonzalez,Mario; Latif,Fadua.
The isolation frequency of Arcobacter species in children with diarrhea, fowls, mammals and food of avian and marine origin was established. In all the samples it was possible to isolate Arcobacter species corresponding 201 (39.4%) to A. butzleri and 24 (4.7) to A. cryaerophilus. Both species were simultaneously isolated in 19 (3.7%) being A. butzleri the most frequently isolated species.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Arcobacter diarrhea; Reservoirs; Food.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822015000100145
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Occurrence and antimicrobial resistance of Campylobacter jejuni and Campylobacter coli isolated from domestic animals from Southern Ecuador Ciência Rural
Toledo,Zorayda; Simaluiza,Rosa Janneth; Fernández,Heriberto.
ABSTRACT: Occurrence and antimicrobial resistance profiles of Campylobacter jejuni and C. coli strains isolated from fecal samples of dogs, pigs, cows and hens in southern Ecuador were studied. Of the 250 samples studied, 84 (33.6%) were Campylobacter positive, with C. jejuni being more frequent (78.6%) than C. coli (21.4%), with the exception of porcine samples, from which C. coli was the only species isolated. Multidrug resistance was reported in 10 Campylobacter strains (11.9%), four C. jejuni and six C. coli, and was always associated with nalidixic acid and ciprofloxacin resistance. All of the amoxicillin-resistant strains were susceptible to amoxicillin-clavulanic acid and were therefore beta-lactamase producers. However, one strain of C. jejuni...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Campylobacter; Reservoirs; Domestic animals; Antimicrobial resistance.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782018001100450
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Serology for brucellosis in free-ranging crab-eating foxes (Cerdocyon thous) and brown-nosed coatis (Nasua nasua) from Brazilian Pantanal Ciência Rural
Dorneles,Elaine Maria Seles; Pellegrin,Aiesca Oliveira; Péres,Igor Alexandre Hany Fuzeta Schabib; Mathias,Luis Antônio; Mourão,Guilherme; Bianchi,Rita de Cassia; Olifiers,Natalie; Rocha,Fabiana Lopes; Lage,Andrey Pereira.
A serological survey in free-ranging crab-eating foxes (Canidae: Cerdocyon thous) and brown-nosed coatis (Procyonidae: Nasua nasua) was performed in the Nhecolândia sub-region of the Brazilian Pantanal to evaluate the presence of anti-smooth Brucella antibodies on those wild populations. The detection of anti-smooth Brucella antibodies was performed by the Rose Bengal Test (RBT) as screening test and the Fluorescence Polarization Assay (FPA) as a confirmatory test. The frequency of smooth Brucella seropositive animals were 13.2% (5/38, 95% CI: 4.4% - 28.1%) for crab-eating foxes and 8.8% (3/34, 95% CI: 1.9% -23.7%) for brown-nosed coatis. No association was found between seropositivity for brucellosis and gender or age. The results of this study suggest...
Tipo: Info:eu-repo/semantics/report Palavras-chave: Brazil; Brucella; Pantanal; Cerdocyon thous; Nasua nasua; Reservoirs; Epidemiology.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782014001202193
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Sensoriamento Remoto para a Caracterização do Aporte de Sedimentos e Compostos Orgânicos da Represa de Paraibuna, São Paulo. Ciências Agrárias
Dias, Nelson Wellausen; Batista, Getulio; Targa, Marcelo dos Santos; Novo, Evlyn Marcia Leão Moraes; Barbosa, Claudio Clemente.
As águas do rio Paraíba do Sul apresentam um alto nível de degradação ambiental em função do despejo direto de efluentes domésticos sem tratamento e de contaminações de origem difusa (sedimentos, nutrientes e matéria orgânica) provenientes do carreamento de solo erodido, fertilizantes, pesticidas, herbicidas e dejetos de animais para os canais de drenagem. Comparativamente, a água do reservatório de Paraibuna possui qualidade de água significativamente superior aos demais trechos do Rio Paraíba do Sul devido ao fato de estar a montante dos principais centros urbanos do Vale do Paraíba. Entretanto as águas que abastecem esta represa são provenientes de duas bacias (Paraibuna e Paraitinga) com características de cobertura e uso do solo bastante distintas que...
Tipo: Article Palavras-chave: Represas; Sedimentação; Sensoriamento remoto hiperespectral; Hyperspectral remote sensing; Reservoirs; Sedimentation.
Ano: 2006 URL: http://hdl.handle.net/2315/41
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Conocimiento local y crecimiento inicial del ojite (Brosimum alicastrum Swartz) bajo distintas condiciones de manejo en la zona de Lomeríos del municipío Paso de Ovejas, Veracruz, México. Colegio de Postgraduados
Domínguez Lagunes, Maira Antonia.
La investigación se realizó en dos etapas. El objetivo de la primera etapa fue documentar el conocimiento local sobre Brosimum alicastrum como árbol forrajero. Las entrevistas con los ganaderos mostraron que el 83% conocía aspectos ecológicos del árbol, el 9% la biología y un 77% aspectos sobre manejo del árbol; esta especie cayó en el desuso a partir del reparto agrario (1940) cuando la delimitación de las parcelas restringió el acceso a los árboles. Se concluyó que existe conocimiento sobre la utilización del árbol aunque limitado, y que el desarrollo tecnológico propició a que este recurso fuera cayendo en desuso; aunque aún existe interés en recuperarlo y utilizarlo. El objetivo de la segunda etapa considerando la primera, fue analizar el crecimiento...
Palavras-chave: Brosimum alicastrum; Vegetación nativa; Conocimiento local; Zonas rurales; Reservorios; Desuso; Hidrogel; Native vegetation; Local knowledge; Rural zones; Reservoirs; Disuse; Hydrogel; Agroecosistemas Tropicales; Maestría.
Ano: 2012 URL: http://hdl.handle.net/10521/1875
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Estimación de aportaciones deducidas a presas mediante análisis de series de tiempo estacionales. Colegio de Postgraduados
Ariza Hernández, Isaías.
Para el estudio de las aportaciones deducidas, que se pueden esperar en presas, se analizan con modelos matemáticos basados en la estadística, con los que se trata de inferir el comportamiento de las variables hidrológicas, que en este caso, son las aportaciones deducidas. Dichos modelos pueden ser modelos de series de tiempo. El objetivo fundamental de este trabajo es presentar una metodología de análisis de series de tiempo estacionales cuyo dominio es el tiempo propuesto por Box y Jenkins (1970). La importancia del estudio de las aportaciones radica principalmente en la estimación del volumen de agua que se espera escurra en una corriente con fines de planeación de los sistemas de irrigación. La metodología fue aplicada al registro histórico de...
Palavras-chave: Aportaciones deducidas; Series de tiempo estacionales; Modelos Box-Jenkins; Surface inflows; Reservoirs; SARIMA; Time-Series; Irrigation districts; Maestría; Hidrociencias.
Ano: 2012 URL: http://hdl.handle.net/10521/725
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Conflicts Associated with Dam Removal in Sweden Ecology and Society
The increasing number of deteriorating old dams that need renovation or have lost their function make dam removal a viable management option. There are at least four major reasons for dam removal: safety, law and policy, economy, and ecology. Here we discuss 17 Swedish dams that were recently considered for removal. Because dam removal usually causes controversy, dam removal initiatives may succeed, fail, or result in a compromise such as a bypass channel for migrating fish. We identify and discuss three major obstructions to dam removal: funding, cultural-historical values, and threatened species. To facilitate dam removal, the reasons for, and the effects of, dam removal must be carefully explained, and the public and stakeholders must be kept...
Tipo: Peer-Reviewed Insight Palavras-chave: Controversies; Dam removal; Information; Obstructions; Reservoirs; Rivers; Stakeholder involvement; Sweden.
Ano: 2009
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Responses of Planktonic Microorganisms from Tropical Reservoirs to Paraquat and Deltamethrin Exposure ArchiMer
Leboulanger, C; Bouvy, M; Pagano, M; Dufour, Robert; Got, P; Cecchi, P.
This study focused on the effects of two pesticides, paraquat (herbicide) and deltamethrin (insecticide), which are two common molecules used intensively in Burkina Faso. Natural bacterial populations, phytoplankton cultures (one cyanobacterium, Cylindrospermopsis raciborskii, and one chlorophycea, Monoraphidium sp.), and two species of zooplankton (Diaphanosoma excisum and Moina micrura) were isolated from aquatic communities and were used as biological targets in the experimental protocols. Paraquat was moderately toxic to bacteria and phytoplankton, whereas deltamethrin was significantly toxic only to the zooplankton species. Paradoxically, the chlorophycea Monoraphidium sp. exhibited a significant increase of in vitro fluorescence after 48 h at the...
Tipo: Text Palavras-chave: West Africa; Reservoirs; Planktonic organisms; Deltamethrin; Paraquat.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/publication-5287.pdf
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Fish assemblage in a dammed tropical river: an analysis along the longitudinal and temporal gradients from river to reservoir Neotropical Ichthyology
Terra,Bianca de Freitas; Santos,Alex Braz Iacone dos; Araújo,Francisco Gerson.
We analysed changes in the fish assemblage structure along a longitudinal gradient of the Paraíba do Sul River and Funil Reservoir. We tested the hypothesis that shifts from lotic to lentic environment affect the richness and structure of the assemblage which are modulated by seasonal rainfall changes. Standardised monthly samplings were carried out from October 2006 to September 2007 in four zones: 1) river upstream from the reservoir; 2) upper part of the reservoir; 3) lower part of the reservoir, and 4) river downstream from the reservoir. Fishes were caught using gillnets deployed for 15 hours. We collected a total of 4550 specimens, representing 35 species and 5 orders. The highest richness and diversity were recorded in zone 2, the transitional zone...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Spatial patterns; Physico-chemical variables; Reservoirs.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252010000300004
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Reproduction of two loricariid species in a confined river and implications for environmental impacts of dams Neotropical Ichthyology
De Fries,Lucas; Rosa,Gilberto da; Silva,José Pezzi da; Vilella,Fábio Silveira; Becker,Fernando Gertum.
ABSTRACT Fish reproduction in floodplain rivers is often linked to flow regime and with the inundation of floodplain habitats. However, in confined rivers, where floodplains are absent, the relation between reproduction and flow can in comparison be expected to be distinct. In this study, we describe the reproductive life-history of Hemiancistrus fuliginosus and Hypostomus isbrueckeri in a confined river and discuss its differences relative to floodplain loricariids and also the implications for effects of dam construction and flow regulation. We found the reproductive peak of both species occurred during lowering waters, just after maximum river flow, in contrast to floodplain species that tend to spawn during rising waters. The studied species presented...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Biodiversity; Environment; Flow regulation; Hydropower; Reservoirs.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252018000400209
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Aquatic plant community in porto primavera reservoir Planta Daninha
Pitelli,R.L.C.M.; Pitelli,R.A.; Rodrigues,C.J.; Dias,J.H.P..
Aiming to identify the populations of aquatic plants present in the Porto Primavera reservoir and evaluate the behavior of Hydrilla verticillata colonization of this water body a survey was carried out in 2007. The data was based on presence or absence, only were assessed the presence or absence of the species and the data were subjected to cluster analysis to establish differences in distribution and occurrence of populations. The community of aquatic plants showed 24 species distributed in 16 botanical families. Cyperaceae and Pontederiaceae were the most representative in terms of species richness. The submerged macrophyte Hydrilla verticillata showed the highest frequency of occurrence in the water body, showing a different behavior from the other...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Hydrilla verticillata; Reservoirs; Aquatic macrophytes exotic invasive aquatic weed.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582014000300001
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Hydrological and environmental issues of interbasin water transfers in India: a case of the Krishna River Basin AgEcon
Smakhtin, Vladimir U.; Gamage, Nilantha; Bharati, Luna.
Tipo: Report Palavras-chave: River basins; Water transfer; Environmental effects; Dams; Reservoirs; Water resources development; Irrigation requirements; Case studies; India; Krishna River; Godavari River; Community/Rural/Urban Development; Crop Production/Industries; Environmental Economics and Policy; Resource /Energy Economics and Policy.
Ano: 2007 URL: http://purl.umn.edu/53065
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Farmer response to rationed and uncertain irrigation supplies AgEcon
Perry, Christopher J.; Narayanamurthy, S.G..
Explores the theoretical and actual responses of farmers faced with irrigation supplies that are limited in relation to available land and labor resources, and where the actual schedule and available volume for delivery are uncertain.
Tipo: Report Palavras-chave: Water resource management; Water use efficiency; Evapotranspiration; Agricultural production; Irrigated farming; Irrigation scheduling; Water allocation; Water supply; Water scarcity; Water delivery; Reservoirs; Uncertainty; Yield; Crop Production/Industries; Labor and Human Capital; Land Economics/Use.
Ano: 1998 URL: http://purl.umn.edu/44582
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