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| Registros recuperados: 26 | |
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| Ndirangu, S.; Uku, J.; Muthama, C.. |
| In May 1999, two sites were selected within the Mombasa Marine Park and Reserve for the study of macroalgal succession due to bleaching. One of the sites was Starfish, which lies within the Mombasa Marine Park and is protected from fishing and the other site was Ras Iwatine, which lies in the Reserve area and is Subjected to fishing activities. The study revealed that the Starfish site had a significantly higher hard coral cover, which did not change over the study period. A comparison of the density of macroalgae revealed that a higher proportion of the substrate in Ras Iwatine was dominated by macroalgae. Settlement tiles, used to study algal recruitment, indicated that the succession process in the Starfish site passes through more stages compared to... |
| Tipo: Working Paper |
Palavras-chave: Algal blooms; Coral reefs; Ecosystems. |
| Ano: 2002 |
URL: http://hdl.handle.net/1834/123 |
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| Elawad,Abubakr. |
| This thesis studies and estimates interannual chlorophyll-a concentration in the Red Sea water using SeaWIFS, MERIS and MOIDS data. We use the data of Chlorophyll-a (CHL-a) for the period from 1998 to 2009 as well as other physical parameters such as, sea surface temperature (SST), photosynthetic available radiation (PAR), wind and mixed layer depth (MLD) to study what control the inter-annual variations of phytoplankton blooms in the Red Sea. The area under study is divided into three zones which cover the north, the middle and the south zones of the Red Sea. When considering the data seasonally, the CHL-a shows that blooms alwaysoccur in the Red Sea during winter. For each zone, the start and the end of the blooms are different from other zones. During... |
| Tipo: Theses and Dissertations |
Palavras-chave: Algal blooms. |
| Ano: 2012 |
URL: http://hdl.handle.net/1834/4558 |
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| Feki, W.; Hamza, A.; Bel Hassen, M.; Rebai, A.. |
| Les données du Réseau National de Surveillance Phytoplanctonique ont été examinées dans le golfe de Gabes durant la période 1995-2005. Un intérêt particulier a été attribué au phénomène de bloom phytoplanctonique. En outre, nous avons examiné plus spécifiquement les variations spatio-temporelles des espèces responsables et les relations avec la variabilité des conditions abiotiques, essentiellement la température, la salinité et le pH. Les résultats ont montré que la période allant d’août à janvier, avec des pics en septembre et janvier, semble être propice à des efflorescences algales. Les dinoflagellés sont responsables de 89% des cas ; l’espèce Karenia selliformis détient à elle seule 64% des occurrences de ce phénomène. Les blooms de K. selliformis,... |
| Tipo: Journal Contribution |
Palavras-chave: Algal blooms; Environmental conditions; Phytoplankton; Salinity; Ph; Phytoplankton; Algal blooms; Environmental conditions; Salinity. |
| Ano: 2008 |
URL: http://hdl.handle.net/1834/3702 |
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| Silva,Lidiane Cristina da; Leone,Isabela Carnielli; Santos-Wisniewski,Maria José dos; Peret,Alberto Carvalho; Rocha,Odete. |
| Dinoflagellates of the genus Ceratium are chiefly marine but there are rare occurrences in freshwater. In this study we analyze the invasion and progressive establishment of Ceratium furcoides, an exotic species, in the Furnas Reservoir. Samples were taken at 36 points in the reservoir, during the months of March, June, September and December, 2007. Measurements of some physical and chemical variables were simultaneously performed at each site. The occurrence of C. furcoides was registered at 20 sites, with densities varying between 0.57 and 28,564,913.0 ind.m-3. Blooms of this species were recorded in points which were classified as mesotrophic, coinciding with the places receiving high amounts of untreated domestic sewage. C. furcoides density was... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Invasive species; Algal blooms; Eutrophication; Reservoir ecology. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032012000200010 |
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| Villac,Maria Célia; Tenenbaum,Denise Rivera. |
| This is a historical account of the biodiversity of phytoplankton in Guanabara Bay, Brazil. It is based on 57 publications that refer to sampling carried out between 1913 and 2004. The publications included are those with direct microscopic identification. Although 80% of the studies focus on ecological issues that tend to mention only the most abundant species, 24 publications provide comprehensive check-lists at the species level, especially of taxa > 20 μm. The inventory of species includes, to date, 308 taxa among 199 diatoms, 90 dinoflagellates, 9 cyanobacteria, 5 euglenophyceans, 1 chlorophycean, 1 prasinophycean, 1 silicoflagellate, and 2 ebriids. The most conspicuous species were the dinoflagellate Scrippsiella trochoidea and diatoms from the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Marine microalgae; Diatoms; Dinoflagellates; Cyanobacteria; Algal blooms. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032010000200030 |
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| Registros recuperados: 26 | |
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