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Registros recuperados: 6
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Ciguatera Risk Assessment In The Indian Ocean Following The 1998 Coral Bleaching Event OceanDocs
Turquet, J.; Quod, J.P.; Conejero, S.; Ralijaona, C..
During the last two decades, countries from the Indian Ocean region have experienced a variety of seafood poisonings involving coral reef fishes (ciguatera), turtles (chelonitoxism), sharks (carchatoxism) and sardines (clupeotoxism) (Quod & Turquet, 1996; Turquet et al., 2000a). The ecotoxicological process of ciguatera fish poisoning (CFP) is caused by benthic dinoflagellates from coral reefs (Gambierdiscus, Prorocentrum, Ostreopsis) that are epiphytic on algal turfs, coral rubble and macro-algae. They produce potent neurotoxins that accumulate in herbivorous marine animals and are transferred to higher levels of the food chain by carnivorous fish. These microalgae are natural inhabitants of coral reefs and become problematic when densities reach...
Tipo: Report Palavras-chave: Coral reefs.
Ano: 2000 URL: http://hdl.handle.net/1834/483
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Consequences of the 1998 Coral Bleaching Event for the Islands of the Western Indian Ocean OceanDocs
Quod, J.P..
Coral reefs are vital for coastal populations and for human activities in general, as they provide people both with living resources and with "services" such as shore protection, sand accretion and coastal tourism. The coral bleaching event of 1997-1998 summer is the most geographically wide spread and severe ever recorded. In the Indian Ocean, warm waters migrated from the South to the North during the first six months. As temperature stress was extreme and/or prolonged, mortality was catastrophically high in many areas (Kenya, Comoros, Seychelles, Tanzania, Maldives), the amount of dead corals ranging from 50-90%. Therefore, ITMEMS (International Tropical Marine Ecosystems Management Symposium) held in Townsville on 24 november 1998 recommended that a...
Tipo: Report Palavras-chave: Coral reefs.
Ano: 1999 URL: http://hdl.handle.net/1834/492
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Coral Bleaching in the Indian Ocean Islands: Ecological Consequences and Recovery in Madagascar, Comoros, Mayotte and Reunion. OceanDocs
Bigot, L.; Quod, J.P..
During the period from January to August 1998, the largest coral bleaching event and subsequent mortality ever recorded had a huge ecological impact on coral reefs throughout the Indian Ocean. This event corresponded to increased seawater temperatures due to an ENSO phenomenon (Wilkinson, 1998). The full extent of the socio-economic impacts will depend on the recovery capacity of corals which, in many locations, are seriously threatened by human activities. This study documents the ecological status and recovery of corals reefs from theComoros archipelago (Comoros, Mayotte, Geyser), Madagascar and Réunion which were affected by the bleaching from January to August 1998. The impact of the bleaching at each location varies in its extent in time and severity.
Tipo: Preprint Palavras-chave: Coral reefs.
Ano: 2000 URL: http://hdl.handle.net/1834/476
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Guidelines for Vulnerability Mapping of Coastal Zones in the Indian Ocean OceanDocs
Bigot, L.; Canovas, S.; Denis, J.; Dutrieux, E.; Hénocque, Y.; Quod, J.P..
The purpose of this guide is to propose a complete methodological procedure for the creation of a database and a cartographic decision-aid system. It is illustrated by two case studies carried out in the area in the framework of the Indian Ocean Commission’s Regional Environmental Programme (REP), financed by the European Union (REP-IOC/EU).
Tipo: Book Palavras-chave: Oceanography; Mapping; Maps; Map projections; Coastal zone; Coastal morphology; Geological data; Geomorphology; Mapping; Geomorphology; Http://aims.fao.org/aos/agrovoc/c_12390; Http://aims.fao.org/aos/agrovoc/c_3233.
Ano: 2000 URL: http://hdl.handle.net/1834/2722
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Indian Ocean Islands – Summary OceanDocs
Westmacott, Susie; Quod, J.P..
CORDIO activities were conducted in seven of the Indian Ocean Islands namely, Comores, Madagascar, Mauritius, Mayotte, Réunion, Rodregues, and Seychelles. On each island biophysical and socio-economic assessments were conducted which have strengthened the annual monitoring of the reefs and collected baseline data for the socio-economic monitoring. In addition, a rapid assessment of the risk posed to island communities of ciguatera poisoning caused by potential increases in abundance of ciguatoxin producing dinoflagellates following bleaching was carried out. This study will eventually be expanded to encompass sites throughout the CORDIO region. Finally, as a record, a digital photographic database of the monitoring sites has been developed for the Island...
Tipo: Report Palavras-chave: Environmental assessment; Impact assessment; Socioeconomic development; Http://aims.fao.org/aos/agrovoc/c_37938; Http://aims.fao.org/aos/agrovoc/c_29966.
Ano: 2000 URL: http://hdl.handle.net/1834/475
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Visual Census of the Reef Fishes in the Natural Reserve of the Glorieuses Islands (Western Indian Ocean) OceanDocs
Durville, P.; Chabanet, P.; Quod, J.P..
This paper constitutes the first qualitative study of coral reef fish populations in the archipelago of the Glorieuses Islands (northern Mozambique Channel). Sampling by visual census techniques, at depths between 0 and 15 meters, was carried out at 30 stations spread over the whole reef. Three hundred and thirty-two (332) fish species belonging to 57 families were registered in this way. These relatively high numbers show that isolated coral reef formations, even of small size, can be endowed with a great specific richness of reef ichthyofauna. These results may be explained by an oceanic flow that favours recruitment, a diversified habitat, and low anthropogenic impact.
Tipo: Journal Contribution Palavras-chave: Coral reefs; Reef fish.
Ano: 2003 URL: http://hdl.handle.net/1834/958
Registros recuperados: 6
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