Consulta: subjectFacets:"Streams"
Registros recuperados: 16
Data/hora: 17/06/2024 03:32:10

Sediment yield modeling using an alternative environmental scenario in northwestern Rio de Janeiro - Brazil.
Provedor de dados: 119
Autores: MARCHIORO, E.; FERNANDES, N.; MACEDO, J.; BHERING, S.; GONCALVES, A.; PRADO, R.
The northwestern Rio de Janeiro (RJ-Brazil) area has been going through deep transformations in its soil use and occupation, which has contributed to increased sediment yield and changes in the soil-water-plant relationship. Because of this picture, this study aims at analyzing the effects of the environmental scenario using reforestation in the areas established by the Article 2 of the Brazilian Forest Code (CFB) on the average sediment yield in the period between 2005 and 2007, in relation to the current use and occupation at the Santa Maria creek experimental basin, located in the Municipality of São José de Ubá, in the northwestern Rio de Janeiro. The mathematical model Soil and Water Assessment Tool - SWAT, version SWAT2005, named AVSWAT-X was used...
Tipo: Separatas
Palavras-chave: Código Florestal Brasileiro; Bacia do Rio Santa Maria; Sedimento; Rio; Streams; Sediment yield.
Ano: 2014
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1002677

Influence of environmental quality on the diet of Astyanax in a microbasin of central western Brazil - doi: 10.4025/actascibiolsci.v35i2.15570
Provedor de dados: 3
Autores: Souza, Rosangela Guarisso de; Universidade Estadual de Mato Grosso do Sul; Lima-Junior, Sidnei Eduardo; Universidade Estadual de Mato Grosso do Sul.
This study analyzed physicochemical characteristics of the water, degradation of the surroundings and the influence of these factors on the diet of two fish species of Astyanax in Tarumã stream microbasin, central western Brazil. Fish were collected in eight sites between 2007 and 2010, using gillnets and sieves. Environmental variables were evaluated by a principal component analysis and the diet based on Spearman’s correlation. The variables width, type of riparian vegetation, pH, conductivity, total dissolved solids, temperature, oxidation and reduction potential, presence of waste, and altitude have separated the sampling sites into two groups: ‘less impacted’ and ‘more impacted’. The two characid species presented omnivorous habit, typical of...
Tipo: Dieta de peixes
Palavras-chave: Ciências Biológicas / Ecologia environmental degradation; Streams; Ichthyofauna; Food Influência da qualidade ambiental na dieta de peixes.
Ano: 2013
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/15570

Influence of land use changes on water chemistry in streams in the State of São Paulo, southeast Brazil
Provedor de dados: 42
Autores: Silva,Daniela M.L.; Camargo,Plínio B.; Mcdowell,William H.; Vieira,Ivan; Salomão,Marcos S.M.B.; Martinelli,Luiz A.
Streamwater is affected by several processes in the watershed including anthropogenic activities that result in changes in water quality as well as in the functioning of these stream ecosystems. Therefore, this work aims to evaluate the concentration of major ions (Ca2+, Mg2+, Na+, K+, NH4+, NO3-, NO2-, Cl-, SO4(2-), PO4(3-), HCO3-) in streams in the state of São Paulo (southeast Brazil). The sampling sites are located at undisturbed (ombrophilus dense forest, semideciduous forest and savanna - cerrado) and disturbed areas (pasture, urbanization and sugar cane crops). Streamwater chemistry varied according to land use change and, in general, was higher in disturbed sites. Streams located in undisturbed sites at Ribeira de Iguape/Alto Paranapanema watershed...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hydrochemistry; Land use; Streams; Watersheds.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000400007

Inventory of cyanobacteria and microalgae cited for the National Park of the Chapada dos Guimarães (MT) and 80 new records from the region
Provedor de dados: 49
Autores: Assis,Gisele Fernanda Pereira; Silva,Samiris Pereira da; Silva,Ludmylla Fernanda de Siqueira; Costa,Regiane Luiza da; Fonseca,Luany Weiler da; De-Lamonica-Freire,Ermelinda Maria; Figueiredo,Daniela Maimoni de; Oliveira,Márcia Teixeira de.
Abstract: Cyanobacteria and microalgae make up a very diverse group and exhibit diverse morphological, biochemical and physiological differences. The knowledge of these organisms that inhabit epicontinental waters in Brazil is extremely heterogeneous in relation to the geographic region and the taxonomic group. Taxonomically there is much more knowledge about the algae of the South and Southeast regions of the country than there is about the algae of the North and Central-West regions. Therefore, this research presents a revised and updated knowledge of the algae that occur in the National Park of the Chapada dos Guimarães (PNCG) and surrounding areas. Our area of study is located in the state of Mato Grosso, in the center-west region of Brazil. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cerrado; Algae; Planktothrix; Taxonomy; Streams.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032018000200311

Diversity and distribution of riffle beetle assemblages (Coleoptera, Elmidae) in montane rivers of Southern Brazil
Provedor de dados: 49
Autores: Braun,Bruna Marmitt; Salvarrey,Andrea Vanesa Batalla; Kotzian,Carla Bender; Spies,Marcia Regina; Pires,Mateus Marques.
The diversity and spatio-temporal distribution of Elmidae (Coleoptera) assemblages in montane rivers and streams of southernmost Brazil (Rio Grande do Sul state) were studied. Six genera were found, represented mostly by larval specimens. Austrolimnius and Macrelmis are new occurrences in the region. Assemblages’ genera composition and dominance were related to the presence of the macrophyte Podostemum. Also, water temperature and stream depth and velocity were the most important drivers related to the assemblages’ distribution. Richness and abundance were positively related to high water velocity and negatively to stream depth. Temporal patterns were detected especially in assemblage abundance, yet a slight pattern in richness was also observed. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aquatic insects; Streams; Neotropical region; Insetos aquáticos; Riachos; Região Neotropical.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032014000200111

Land use change in the Atlantic Forest affects carbon and nitrogen sources of streams as revealed by the isotopic composition of terrestrial invertebrates
Provedor de dados: 49
Autores: Augusto,Fernanda Gaudio; Tassoni Filho,Mauricio; Ferreira,Anderson; Pereira,Alexandre Leandro; Camargo,Plínio Barbosa de; Martinelli,Luiz Antonio.
Terrestrial invertebrates link terrestrial systems to aquatic ones, making vegetal material produced in the watershed available to aquatic food webs. In this study, using carbon and nitrogen stable isotopes, we evaluated the importance of introduced C4 grasses as a source of carbon in aquatic food webs of headwater streams of the coastal Atlantic Forest located on the north coast of the State of São Paulo, in the southeastern region of Brazil. Terrestrial invertebrates were collected in two streams: one where the main land cover was pristine montane Atlantic Forest (forest stream) and another where the main land cover was introduced C4 forage grasses for livestock (pasture stream). The average δ13C of terrestrial invertebrates collected in the forest...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Atlantic Forest; Land use; Streams; Stable isotopes; Terrestrial invertebrate.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032015000200104

Diversity of Odonata (Insecta) in Seasonal Deciduous Forest fragments in southern Brazil (state of Rio Grande do Sul), with a new record for the state and comments on the seasonal distribution of the species
Provedor de dados: 49
Autores: Pires,Mateus Marques; Kotzian,Carla Bender; Sganzerla,Cleber; Prass,Gabriel; Dalzochio,Marina Schmidt; Périco,Eduardo.
Abstract: We present an Odonata (Insecta) check list of species occurring in a fragment of the Seasonal Deciduous Forest (Atlantic Forest biome) from the central region of the state of Rio Grande do Sul (RS), southern Brazil, along with a list of the odonate species recorded in this phytoecological region for the state. In addition, we provide comments on the seasonal distribution of the species occurring in the study area. Two streams and seven farm ponds located in the middle course of the Jacuí River basin were surveyed between December 2007 and February 2009. Overall, we recorded 49 species from 21 genera and six families. Argia serva Hagen in Selys, 1865 (Coenagrionidade) had its first occurrence record mentioned for the state, elevating to 183 the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dragonflies; Inventory; Atlantic Forest; Streams; Farm ponds.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032019000400307

Fish species diversity in headwaters streams of Paraguay and Paraná Basins
Provedor de dados: 52
Autores: Súarez,Yzel Rondon; Valério,Sabrina Bigatão; Tondado,Karina Keyla; Florentino,Alexandro Cezar; Felipe,Thiago Rota Alves; Ximenes,Lidiani Queli Lubas; Lourenço,Luzia da Silva.
The influence of spatial, temporal and environmental factors on fish species diversity in headwater streams in Paraguay and Paraná basins, Brazil was examined. A total of 4,605 individuals were sampled, distributed in 60 species. The sampled streams in Paraná basin presented a larger total species richness (42) than Paraguay streams (40). However the estimated richness was larger in Paraguay basin (53) than Paraná streams (50). The streams of Paraná basin had a greater mean species richness and evenness, while more individuals per sample were found in the Paraguay basin. Difference between the sub-basins were found in the Paraguay basin, while for the basin of Paraná, richness and evenness vary significantly between the sub-basins, but the number of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Community ecology; Fish diversity; Streams; Paraguay Basin; Paraná Basin.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132007000700014

Variation and life strategies of the Trichoptera (Insecta) larvae community in a first order tributary of the Paquequer River, Southeastern Brazil
Provedor de dados: 57
Autores: HUAMANTINCO,A. A.; NESSIMIAN,J. L.
The Trichoptera fauna was sampled in a first order tributary of Paquequer River, in the district of Teresópolis, Rio de Janeiro State. Quantitative samples of litter from pools, litter from riffles, sand, and stones were taken on each season from February 1991 to February 1992.The life cycles of common genera were categorized into three groups of biological strategies. The largest group represented the general profile of the community, in which ultimate instar larvae were predominant in spring and the younger ones in summer. Probably, emergence and oviposition occur in spring.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Trichoptera; Larvae; Life strategies; Streams; Atlantic Forest.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000100010

Occurrence of Hirudinea species in a post urban reach of a Patagonian mountain stream
Provedor de dados: 76
Autores: Miserendino,M. Laura; Gullo,Bettina S.
Temporal (May 2005 to February 2006) and habitat distribution (pools and riffles) of Hirudinea species was analyzed at a post urban reach from Esquel stream (Chubut province, Patagonia, Argentina). Site was located 5.7 km downstream a Waste Treatment Plant. Mean values of nutrients: ammonia, nitrates and soluble reactive phosphate, as well water conductivity, turbidity and total suspended solids indicated physical and organic pollution. Leeches assemblage was composed by the glossiphonids: Helobdella scutifera Blanchard, 1900, H. michaelseni (Blanchard, 1900), H. simplex (Moore, 1911), Helobdella sp., H. hyalina Ringuelet, 1942, H. obscura Ringuelet, 1942 and the semiscolecid Patagoniobdella variabilis (Blanchard, 1900). From these H. hyalina and H....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Leeches; Assemblages; Streams; Urbanization; Organic pollution.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212014000300006

Fish assemblage structure in tributaries of the Meia Ponte River, Goiás, Brazil
Provedor de dados: 83
Autores: Fialho,Afonso P.; Oliveira,Leandro G.; Tejerina-Garro,Francisco L.; Gomes,Luiz C.
This study was conducted in the Meia Ponte River basin, which is located in the Cerrado biome. The objective was to describe the structure of fish assemblages and to evaluate the results with the regard to the position of the tributaries (sampling stations) along the basin. This basin drains 35 municipalities of Goiás State. Springs of the Meia Ponte are located in the district of Itauçu (GO), in the Serra dos Brandões. Two sampling were conducted, one in the rainy season (March/2001) and another in the dry season (August/2001). Thirty sampling sites in tributaries and one in the channel of the Meia Ponte River, in its upper course, were selected to capture fish with dipnets (3 mm mesh) during one hour, along 100-m stretch. Sampling periods (season; rainy...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Upper rio Paraná; Cerrado; Streams.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252007000100007

A Century after! Rediscovery of the ancient catfish Diplomystes Bleeker 1858 (Siluriformes: Diplomystidae) in coastal river basins of Chile and its implications for conservation
Provedor de dados: 83
Autores: Muñoz-Ramírez,Carlos P.; Briones,Raul; Colin,Nicole; Fierro,Pablo; Górski,Konrad; Jara,Alfonso; Manosalva,Aliro.
ABSTRACT The ancient catfish family Diplomystidae, with seven species endemic to rivers of southern South America, represents one of the oldest branches of the diverse order Siluriformes. With most species endangered, new reports of these species become extremely valuable for conservation. Currently, it is assumed that Diplomystes species inhabit only Andean (large) basins, and that they are extinct from coastal (small) basins from which their presence have not been recorded since 1919. Here, we document new records of the family Diplomystidae in the Laraquete and Carampangue basins, two coastal basins from the Nahuelbuta Coast Range, Chile, with no previous reports. This finding represents the rediscovery of the genus in coastal basins in more than a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Management Unit; Mitochondrial DNA; Rare Species; Streams; Threatened Species.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252020000100208

Resource use by two electric fishes (Gymnotiformes) of the National Forest Saracá-Taquera, Oriximiná, Pará
Provedor de dados: 83
Autores: Soares,Bruno E.; Rosa,Daniela C. O.; Silva,Nathália C. S.; Albrecht,Miriam P.; Caramaschi,Érica P.
ABSTRACT Fishes of the order Gymnotiformes have high diversity of oral and head morphology, which suggests trophic specializations within each clade. The aim of this study was to describe resource use patterns by two fish species (Gymnorhamphichthys rondoni and Gymnotus coropinae) in the National Forest Saracá-Taquera, Oriximiná - Pará, analyzing microhabitat use, diet composition, feeding strategies, niche breadth and niche overlap. Stomach contents of 101 individuals (41 G. rondoni and 60 G. coropinae), sampled in 23 headwater streams were analyzed and volume of food items was quantified to characterize their feeding ecology. Gymnorhamphichthys rondoni was captured mainly on sandy bottoms, whereas G. coropinae in crevices. Both species had a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amazon; Diet overlap; Feeding; Microhabitat; Streams.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252017000200204

Ecological distribution of Cyanophyceae in lotic ecosystems of São Paulo State
Provedor de dados: 88
Autores: BRANCO,LUIS HENRIQUE Z.; NECCHI JÚNIOR,ORLANDO; BRANCO,CIRO CESAR Z.
A hundred seventy two stream reaches from six distinct natural regions (parts of biomes or geological areas) in São Paulo State (Atlantic Rainforest, Cerrado, Hard Water regions, Northwest region, Subtropical Rainforest, and Tropical Rainforest) were searched for the most representative macroscopic Cyanophyceae of phytobenthic communities. Selected ecological parameters were analyzed in each stream segment: conductance, current velocity, oxygen saturation, pH, turbidity, and water temperature. Algal abundance was evaluated as percentage cover. Thirthy four cyanophyte taxa were identified and Phormidium retzii was the most widespread species throughout the State, occurring in all studied regions, except in hard water areas, and was negatively correlated to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cyanophyceae; Ecological distribution; Conductance; Streams; Brazil.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042001000100011

Macroinvertebrates as tadpole food: importance and body size relationships
Provedor de dados: 104
Autores: Dutra,Silvia L.; Callisto,Marcos.
Macroinvertebrates as food were recorded for three anurans tadpoles: Hyla saxicola (Bokermann, 1964) (Hylidae), Scinax machadoi (Bokermann &amp;amp; Sazima, 1973) (Hylidae), and Bufo rubescens (Lutz, 1925) (Bufonidae). These species are commonly found in the mountain streams at Serra do Cipó National Park, Minas Gerais State, Brazil. Tadpoles were collected in pools of second-order reach in Mascates stream and third and fourth order reaches of Indaiá stream from March-October, 2003. Biometrical data were recorded before dissecting each individual and a feeding importance index was estimated. Eight taxa of chironomids and three taxa of mayfly exuviae were found in the guts, but no significantly differences were found between tadpole species (ANOVA, p &gt;...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aquatic food-webs; Aquatic insects; Conservation; Streams; Tadpole diet.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752005000400018

Composição em tamanho dos peixes (Actinopterygii, Teleostei) de ribeirões da bacia do rio Tibagi, Paraná, Brasil
Provedor de dados: 104
Autores: Shibatta,Oscar A.; Cheida,Carolina C.
The standard length of 7610 specimens of 43 species from eight streams of rio Tibagi basin was obtained in order to analyze the means of fish sizes. The higher mean size was observed in Gymnotus carapo Linnaeus, 1758 (165,5 mm) and the smaller, in Phalloceros caudimaculatus (Hensel, 1868) (16,25 mm). Some fish like Acestrorhynchus lacustris (Reinhardt, 1874), Leporinus obtusidens (Valenciennes, 1836), Gymnotus carapo Linneus, 1758 and Synbranchus marmoratus Bloch, 1795 can reach big or medium size when adults but were collected only young, evidencing they use some streams in beginning of life. The mean size of total species was 49,81mm, what shows the small size composition of fishes in the streams. The Kolmogov-Smirnov test comparing the mean size of all...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Body size; Conservation; Ecomorphology; Streams.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752003000300016