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| Registros recuperados: 56 | |
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| Zalmon,Ilana Rosental; Krohling,Werther; Ferreira,Carlos Eduardo Leite. |
| Harbor terminals and urban sewage effluents affect the composition and distribution of epibenthic organisms. In this study, we hypothesized that the benthic community structure at the Vitoria Harbor changes spatially in a ~3 km scale, and that these changes are associated with environmental gradients resulting from point-source sewage and differences in the physical and chemical parameters of the water along the harbor access channel. Four sites, internal (PI), intermediate-internal (PMI), intermediate-external (PME) and external (PE), varying from 0.5 to 4.0 km off the harbor, were sampled on five quadrats at six sampling dates (N = 30 per site). The epibenthic community on the shallow sublitoral rocky shore was sampled fortnightly from December 2005 to... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Epibenthic community; Environmental gradient; Estuary; Sedimentation. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702011000500012 |
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| Schmidt, Sabine; Gonzalez, Jean-louis; Lecroart, Pascal; Tronczynski, Jacek; Billy, Isabelle; Jouanneau, Jean-marie. |
| Quantifier les processus de remaniement sédimentaire procure une vision nouvelle du fonctionnement des écosystèmes benthiques de l'étang de Thau, lieu d'une importante production ostréicole. Afin d'évaluer les taux de bioturbation des sédiments de surface, des profils de deux traceurs radioactifs, le béryllium 7Be (T1/2 = 53 jours) et le thorium 234Th (T1/2 = 24.1 jours) ont été mesurés à partir de carottes sédimentaires prélevées entre décembre 2001 et décembre 2006. La sélection de plusieurs sites a permis de couvrir la diversité de l'étang de Thau : C4, T10, et T11 dans le bassin central, C5, T7 et T8 au niveau des secteurs ostréicoles, T2 et T4 à l'ouest du bassin, et T12 à l'est près de la zone industrielle. Le 234Th en excès (234Thxs ; i.e. apporté... |
| Tipo: Text |
Palavras-chave: Mediterranean Lagoon; Radionuclides; Biodeposition; Sedimentation. |
| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/2007/publication-2584.pdf |
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| 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 & 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: Folhetos |
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 |
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| Molina-M., A.; Molina-M., C.; Giraldo-O., L.; Barrera-O., R.. |
| The geologic (stratigraphic) and morphodynamic characteristics throughout 76 km of the coastal profile of the Colombian Caribbean, including those between Barranquilla (Bocas de Ceniza) and the spit of Galerazamba are described. The sections of the coast that have been affected by erosive events and those with sedimentary accretion are described. Some of them are associated to both natural and anthropic phenomena. Geologically, the coastal edge is defined by sedimentary rocks, weakly consolidated sediments and inconsolidated sediments, that include ages from the upper Paleocene to the Recent. From the point of view of the evaluation of the coast in terms of stability and instability, the high coasts are classified as: Critic zones (Punta Sabanilla,... |
| Tipo: Journal Contribution |
Palavras-chave: Stratigraphy; Coastal zone; Erosion; Sedimentation; Stratigraphy; Erosion; Sedimentation; Http://aims.fao.org/aos/agrovoc/c_7440; Http://aims.fao.org/aos/agrovoc/c_2651; Http://aims.fao.org/aos/agrovoc/c_6926. |
| Ano: 1999 |
URL: http://hdl.handle.net/1834/3433 |
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| MAHIQUES,MICHEL M. DE; FIGUEIRA,RUBENS C.L.; ALVES,DANIEL P.V.; ITALIANI,DIANA M.; MARTINS,CRISTINA C.; DIAS,JOÃO M.A.. |
| The role played by human activity in coastline changes indicates a general tendency of retreating coasts, especially deltaic environments, as a result of the recent trend of sea level rise as well as the blockage of the transfer of sediments towards the coast, especially due to the construction of dams. This is particularly important in deltaic environments which have been suffering a dramatic loss of area in the last decades. In contrast, in this paper, we report the origin and evolution of an anthropogenic delta, the Valo Grande delta, on the south-eastern Brazilian coast, whose origin is related to the opening of an artificial channel and the diversion of the main flow of the Ribeira de Iguape River. The methodology included the analysis of coastline... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Anthropic activity; Delta; Sedimentation; Lagoon. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000401597 |
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| Francis, Jason M.; Daniell, James J.; Droxler, Andre W.; Dickens, Gerald R.; Bentley, Samuel J.; Peterson, Larry C.; Opdyke, Bradley N.; Beaufort, Luc. |
| The Gulf of Papua (GoP) has become a focal point for understanding the deposition and accumulation of siliciclastic and carbonate material along and across a low-latitude continental margin. Although studies have addressed submarine geomorphological features on the inner and middle shelves, as well as processes that may have led to their formation, the seafloor of adjacent slope regions remains poorly documented. This study presents and interprets results from approximately 13,000 line-km of multibeam bathymetry, 9500 line-km of 3.5 kHz seismic, and 122 sediment cores that were collected from the GoP shelf edge and slope, primarily on two cruises (PANASH and PECTEN). Bathymetric maps, in conjunction with the seismic profiles and cores, were used to make... |
| Tipo: Text |
Palavras-chave: Great barrier reef; New Guinea; Platform margin; Foreland basin; OF Papua; Sedimentation; Shelf; Bank; Circulation; Australia. |
| Ano: 2008 |
URL: https://archimer.ifremer.fr/doc/00208/31938/30356.pdf |
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| González Díaz, S. P.. |
| En las últimas décadas ha ocurrido un deterioro acelerado de los arrecifes de coral debido al efecto sinérgico de impactos naturales y antrópicos. En consecuencia, el objetivo de la tesis es evaluar los efectos acumulativos producidos por agentes estresantes múltiples y que impactan de forma simultánea los corales hermatípicos. Para ello se estimaron indicadores ecológicos en los niveles de comunidad y población. Los resultados obtenidos en esta investigación evidencian cambios en la estructura de las comunidades de corales que se asocian con el impacto antrópico directo existente a lo largo de la costa noroccidental de Cuba y que disminuye en la dirección este-oeste. Los indicadores ecológicos referidos a las tallas de los corales, muestran... |
| Tipo: Theses and Dissertations |
Palavras-chave: Coral reefs; Agents; Sedimentation; Eutrophication. |
| Ano: 2010 |
URL: http://hdl.handle.net/1834/5385 |
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| Munyao, T.M.. |
| Shirazi-Funzi Lagoon is situated about 70km Southwest of Mombasa. It occurs within longitudes 39°22'E and 39°27'E, and latitudes 4°30'S and 4°35'S and covers about 57km2. The study area lies in the coastal plain, wich is below the 30m contours, and is underlain by coral limestone of the Pleistocene age, and lagoonal deposits from both land and sea. Both the hinterlands at Shirazi and the Funzi Island are underlain by the MtoMkuu formation of upper and lower Cretaceous, of the Post Karoo systems. This formation is overlain by Pleistocene sands that cover the Funzi Island and a narrow strip of the coastline immediately north of Funzi Island. |
| Tipo: Report |
Palavras-chave: Sedimentation; Coastal zone. |
| Ano: 1993 |
URL: http://hdl.handle.net/1834/334 |
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| Araya-Vargas,Alexander; Busutil,Linnet; García-Rojas,Andrea; Pereira-Chaves,José Miguel; Piedra-Castro,Liliana. |
| ABSTRACT Marine sponges fulfill many critical functions to coral reefs. In turn, variations in the community structure of the poriferans may indicate changes in the environmental conditions of the ecosystems where they live. However, their study has been scarce in the Caribbean of Costa Rica, mainly in the ecological field. Therefore, the community structure of these organisms was evaluated in four reef patches (Perezoso, Pequeño, Coral Garden, and the 0.36) and it was determined whether it could be explained by sedimentation, substrate, and depth. Relative abundance (RA) and relative coverage (RC) for each species, sponge density, and diversity indices (species richness, Shannon heterogeneity, Pielou's evenness, and Simpson's dominance) were calculated... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Porifera; Coral reef; Sedimentation; Substrate; Depth. |
| Ano: 2020 |
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0122-97612020000100039 |
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| Registros recuperados: 56 | |
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