Consulta: creatorFacets:"Silva,Alexandre Marco da"
Registros recuperados: 5
Data/hora: 17/06/2024 14:44:04

Fish assemblages in stream stretches occupied by cattail (Typhaceae, Angiospermae) stands in Southeast Brazil
Provedor de dados: 83
Autores: Rocha,Fabíola Carla da; Casatti,Lilian; Carvalho,Fernando Rogério; Silva,Alexandre Marco da.
Macrophytes are a major component of lentic and lotic aquatic ecosystems. As consequences of environmental degradation, species of cattail (genus Typha) may become dominant along streams. The purpose of this study was to investigate the structure and feeding of fish assemblages in stream stretches under influence of Typha sp., also addressing the influences of temporal variation on composition, abundance, biomass, diversity, species richness, and feeding of fish. Six streams (labelled S1-S6) in the upper rio Turvo basin, southeast Brazil, with dense stands of Typha sp. in the instream and riparian habitat, were studied in six campaigns during three central months in both of the dry and wet periods, by using a standardized collection effort. Thirty-seven...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Disturbance; Chironomidae larvae; Detritus; Macrophytes; Upper rio Paraná.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252009000200016

Historical land-cover/use in different slope and riparian buffer zones in watersheds of the state of São Paulo, Brazil
Provedor de dados: 63
Autores: Silva,Alexandre Marco da; Nalon,Marco Aurélio; Kronka,Francisco José do Nascimento; Alvares,Clayton Alcarde; Camargo,Plinio Barbosa de; Martinelli,Luiz Antonio.
Information about the land cover of a region it is a key information for several purposes. This paper aimed to elaborate land-cover maps using digital satellite images obtained in 1997 from seven watersheds (Piracicaba, Moji-Guaçu, Alto Paranapanema, Turvo Aguapeí, Peixe, and São José dos Dourados) located in the State of São Paulo, southeastern Brazil. Additionaly, this study evaluated the relationship between land-cover and slopes of the terrain of the seven watersheds. A third objective was to estimate the percentage of riparian vegetation currently remaining along the streams in a 30-meter width buffer zone. Three research questions were posed: i) What is the dominant land-cover of these watersheds? ii) Is the riparian vegetation well preserved in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Land planning; Land management; Geoprocessing; Catchments; Rivers.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000400003

Soil loss risk and habitat quality in streams of a meso-scale river basin
Provedor de dados: 63
Autores: Silva,Alexandre Marco da; Casatti,Lilian; Alvares,Clayton Alcarde; Leite,Aline Maria; Martinelli,Luiz Antonio; Durrant,Steven F.
Soil loss expectation and possible relationships among soil erosion, riparian vegetation and water quality were studied in the São José dos Dourados River basin, State of São Paulo, Brazil. Through Geographic Information System (GIS) resources and technology, Soil Loss Expectation (SLE) data obtained using the Universal Soil Loss Equation (USLE) model were analyzed. For the whole catchment area and for the 30 m buffer strips of the streams of 22 randomly selected catchments, the predominant land use and habitat quality were studied. Owing mainly to the high soil erodibility, the river basin is highly susceptible to erosive processes. Habitat quality analyses revealed that the superficial water from the catchments is not chemically impacted but suffers...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Erosion modeling; Expectation of soil loss map; Riparian vegetation; Water quality.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000400004

Levantamento das cargas orgânicas lançadas nos rios do estado de São Paulo
Provedor de dados: 49
Autores: Martinelli,Luiz Antonio; Silva,Alexandre Marco da; Camargo,Plínio Barbosa de; Moretti,Luiz Roberto; Tomazelli,Andréa Cristina; Silva,Daniela Mariano Lopes da; Fischer,Evandro Gaiad; Sonoda,Kathia Cristhina; Salomão,Marcos S. M. B.
Os parâmetros: volume de esgoto gerado, volume de esgoto tratado, cargas poluidoras domiciliar potencial e remanescente, cargas equivalentes de carbono e nitrogênio foram estimados neste estudo a partir dos dados populacionais do censo 2000 do IBGE para todos os municípios do Estado de São Paulo bem como as bacias hidrográficas dos rios Piracicaba, Mogi-Guaçu, Turvo, Peixe, Aguapeí, São José dos Dourados, Itapetininga, Apiaí, Taquari e Paranapanema,. Para essas estimativas foram levados em consideração o nível de atendimento das populações pela existência de redes coletoras de esgoto e a existência ou não de algum tipo de tratamento de esgoto em cada município do Estado. Todas essas estimativas encontram-se disponíveis em www.cena.usp.br/biota. Apesar da...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Rios; Bacias hidrográficas; Poluição; Esgoto; Cargas orgânicas.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032002000200006

Hydrosedimentological dynamic on Água Fria Watershed
Provedor de dados: 52
Autores: Silva,Alexandre Marco da; Schulz,Harry Edmar.
This study aimed surveying the amount of sediment yielded from the Água Fria watershed (Palmas, Tocantins, Brazil), from February-1998 to January-1999, and investigating the relations between the sediment yield and some environmental and/or antropic factors. The Colby's method was the technique employed for this investigation. The specific sediment yield and sediment delivery ratio were also determined for this period. It was estimated that 138,619 tons of sediment were yielded and the specific sediment yield for the study area was 827 t km-2 y-1, while the sediment delivery ratio was 6.2%. The suspended load was the most dominating fraction in almost all the studied period.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sediment yield; Sediment delivery ratio; Watershed.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132007000500014