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| Registros recuperados: 203 | |
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| Mwachireya, S.; Uku, J.N.; Mdodo, R.; Obura, D.; Wawiye, P.. |
| Coral reefs along the entire coast of Kenya suffered widespread bleaching and mortality of corals during the first half of 1998 (Wilkinson, 1998; Obura, 1999; McClanahan et al., 1999). This status report summarises findings relating specifically to coral bleaching, mortality and effects on benthic community structure. In addition, preliminary results from a number of research projects investigating different aspects of the bleaching event are reported here. In shallow waters, on a per-area basis, most of Kenya’s southern fringing reefs have lost between 66% and 80% of their live corals. Coral reefs in deeper water suffered less mortality due to lesser exposure to higher temperatures. Reefs on the northern part of the coast, influenced by cold water... |
| Tipo: Report |
Palavras-chave: Coral reefs; Ecology. |
| Ano: 2000 |
URL: http://hdl.handle.net/1834/774 |
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| Franklin, H.; Muhando, C. A.. |
| Anthropogenic pressures on the coral reefs of Tanzania are high. Over-exploitation, destructive fishing practices, unplanned tourism and high sedimentation load are amongst the most evident contributing factors whilst the poor economy and increased human population density along the coast is an underlying problem. There is a clear need for alternative sources of livelihood and effective ways to manage coral reef resources sustainably. Mariculture is becoming a common component in coastal zone management in Tanzania. |
| Tipo: Report |
Palavras-chave: Coral reefs. |
| Ano: 1996 |
URL: http://hdl.handle.net/1834/992 |
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| Perera-Valderrama, S.; Alcolado, P.M.; Caballero-Aragón, H.; Guardia-Llansó, E.; Cobián-Rojas, D.. |
| En el 2007 se evaluó el estado de salud de los arrecifes coralinos del Parque Nacional Guanahacabibes, Cuba, sobre la base de la condición de las comunidades de corales. Se analizaron indicadores de condición de los corales escleractinios (diámetro máximo, riqueza de especies, enfermedades y mortalidad) a distintas profundidades, en 13 estaciones con diferentes niveles de exposición a los principales fenómenos océano-atmosféricos generadores de oleaje en el área (vientos nortes, sures y alisios). Se identificaron 42 especies de corales pétreos. Las más abundantes fueron: Siderastrea siderea, Montastraea faveolata, Agaricia agaricites y Porites astreoides. El promedio de cobertura de coral vivo varió entre 4.8% y 31.2%, con un promedio general de 17%. El... |
| Tipo: Journal Contribution |
Palavras-chave: Coral reefs. |
| Ano: 2013 |
URL: http://hdl.handle.net/1834/5343 |
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| Spurgeon, J.P.G.; Lindahl, U.. |
| This chapter provides an introduction to the economics of coral reef restoration. A comparison of coral restoration schemes from four countries indicates that costs can vary from some US$ 13,000 per ha to over a hundred million US$ per ha. However, it also reveals that cost estimates in the literature are not readily comparable, and that many cost components of restoration are ignored. Little work has been conducted into the potential benefits of coral restoration. This issue is briefly considered with reference to the case studies. The chapter suggests that a benefit–cost analysis approach should be used more often to help assess the justification for coral reef restoration and to improve the efficiency of any such expenditure. It is clear that a greater... |
| Tipo: Book Section |
Palavras-chave: Coral reefs. |
| Ano: 2000 |
URL: http://hdl.handle.net/1834/564 |
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| Muhando, C.A.. |
| Coral reefs play a crucial role to the well-being of coastal communities in Tanzania. Coastal fisheries, ecotourism and coastal land protection are, to some extent, sustained by coral reefs. A variety of fish species, spiny lobsters, octopus, sea cucumbers, clams, oysters and turtles form the basis of harvestable reef resources. More than 30% of marine fish landings are harvested on or adjacent to coral reef environment. Coral reefs also support offshore fisheries by providing feeding and nursery grounds for some oceanic (pelagic) fish stocks. Tourism based on coral reef ecosystems is peaking up, creating new opportunities for employment and substantial amounts of income for the people of Tanzania. |
| Tipo: Report |
Palavras-chave: Coral reefs; Socioeconomic development; Http://aims.fao.org/aos/agrovoc/c_29966. |
| Ano: 2000 |
URL: http://hdl.handle.net/1834/490 |
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| Obura, D.. |
| Eastern African coral reefs were severely impacted by the El Niño Southern Oscillation of 1997-98, with bleaching and mortality levels varying from <1% in South Africa to 80% and greater on reefs in northern Tanzania and Kenya. Recovery of affected reefs to 2002 has been poor to moderate, and patchy. Reefs strongly impacted by the El Niño that had high coral diversity and cover have recovered to less than one quarter of pre-bleaching coral cover. However, some high diversity reefs that escaped the bleaching impacts have remained healthy, with high coral cover and diversity. Degraded reefs outside Marine Protected Areas (MPAs) that were severely damaged by the El Niño have generally recovered to 50-100% of pre-bleaching coral cover. Recruitment of corals... |
| Tipo: Book Section |
Palavras-chave: Coral reefs; El Nino phenomena. |
| Ano: 2002 |
URL: http://hdl.handle.net/1834/338 |
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| Santodomingo, N.; Rodríguez-Ramírez, A.; Garzón-Ferreira, J.. |
| The pomacentrid Stegastes planifrons is one of the most conspicuous inhabitants of the coral reefs and constitutes an important agent of natural coral mortality. These fishes kill coral directly by removing coral polyps for opening up a space for its algal turfs, which are their main food. The population density, territory and algal turfs areas of Stegastes planifrons were assessed at Chengue and Gayraca bays in Tayrona Natural Park, as a contribution to understand natural processes involved in the coral reef deterioration. During August to November 1999, belt transects (20 x 2 m) were evaluated at four reef habitat types: multispecific coral assemblages dominated by (1) Colpophyllia natans (COLP) or (2) Montastraea spp. (MONT); and monospecific coral... |
| Tipo: Journal Contribution |
Palavras-chave: Territoriality; Coral reefs; Coral reefs; Http://aims.fao.org/aos/agrovoc/c_1880. |
| Ano: 2002 |
URL: http://hdl.handle.net/1834/3125 |
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| Hassan, M.; Kotb, M.M.A.; Al-Sofyani, A.A.. |
| The status of coral reefs bordering the Red Sea and Gulf of Aden is generally good, with live hard coral cover averaging 20-50%. There are predominantly fringing reefs bordering the coasts of Djibouti, Egypt, Saudi Arabia, Sudan, and Yemen. Atolls and pinnacle reefs occur mainly in the Central and Southern Red Sea. However, technical reports, personal observations and comparative data show recent decreases in live coral cover. Fish populations are also declining and there have been several small outbreaks of the crownof- thorns starfish (COTS), some local bleaching events and an increase in bioeroding organisms such as the urchin Diadema setosum and the coral eating gastropods Drupella and Coralliophila. Threats to coral reefs differ within the region, and... |
| Tipo: Book Section |
Palavras-chave: Coral reefs. |
| Ano: 2002 |
URL: http://hdl.handle.net/1834/389 |
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| Schleyer, M.; Obura, D.; Motta, H.; Rodrigues, M.J.. |
| The 1997-1998 El Niño southern oscillation caused elevated sea temperatures that resulted in global coral bleaching. Coral reefs constitute an important biological resource in terms of their complex biodiversity and are the basis for tropical fisheries and marine ecotourism. They represent one of Mozambique’s main coastal assets, and coastal communities and the growing tourism industry rely mainly on reef-based resources. Today, about 6.6 million people live within Mozambique’s 48 coastal administrative districts. This represents 42% of the current population (15.7 million), which is expected to grow at 3% p.a. (INE, 1998). In 1994, the population density in coastal districts was 28 persons/km2. In 1996, much higher densities were recorded in the coastal... |
| Tipo: Report |
Palavras-chave: Coral reefs; El Nino phenomena. |
| Ano: 1999 |
URL: http://hdl.handle.net/1834/489 |
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| Busutil, L.; Hansel Caballero, H.; Hidalgo, G.; Alcolado-Prieto, P.; Alcolado, P. M.. |
| Se determinó la condición del bentos de los arrecifes coralinos del polo turístico Santa Lucía (nordeste de Cuba) antes y después del paso del Huracán Ike, a partir de indicadores biológicos de la metodología AGRRA. Se evidenció un gran deterioro de la cresta arrecifal desde el primer muestreo. El arrecife frontal presentó mejores condiciones que la cresta, fundamentalmente hacia el este y hacia las mayores profundidades. Los valores bajos de la densidad de corales, la cobertura viva de coral y del reclutamiento de corales, así como la gran cobertura de macroalgas fueron las variables más críticas. La incidencia de enfermedades microbianas y de blanqueamiento de corales fue baja. Las causas más importantes de afectación al arrecife coralino muestran... |
| Tipo: Journal Contribution |
Palavras-chave: Coral reefs; Coral reefs; Http://aims.fao.org/aos/agrovoc/c_1880. |
| Ano: 2011 |
URL: http://hdl.handle.net/1834/4049 |
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| Bowden-Kerby, A.. |
| Of the planet’s 600,000 km2 of coral reefs (Jameson et al., 1995), roughly 70-80% are located in developing countries. Many of these reefs are owned or controlled by indigenous fishing communities rather than national or state governments. These rural fishing communities are a primary force of destruction to coral reefs on a global scale (Wilkinson, 1998), therefore their involvement in the management and conservation of coral reefs will be an essential part of reversing coral reef decline.... |
| Tipo: Report |
Palavras-chave: Ecosystem management; Coral reefs; Fishery resources. |
| Ano: 2003 |
URL: http://hdl.handle.net/1834/849 |
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| Zahir, H.. |
| A pilot reef monitoring study was conducted in 1998 to assess the extent of coral bleaching in the Maldives. The aims of this monitoring exercise were: 1. To quantitatively document the post-bleaching status of the shallow-water coral communities on the reefs of the north, central and southern regions of Maldives. 2. To estimate bleaching-induced coral mortality by comparing data yielded by the pilot survey with data from previous surveys, especially those sites for which historical data are available. |
| Tipo: Working Paper |
Palavras-chave: Coral reefs. |
| Ano: 2000 |
URL: http://hdl.handle.net/1834/432 |
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| 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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| Hayes, R.L.; Goreau, T.J.; McClanahan, T.R.. |
| Large-scale coral bleaching has happened repeatedly in the Pacific and Indian oceans and the Caribbean since 1982. Previously it was observed only on a small scale (Williams and Bunkley- Williams 1990;Jokiel & Coles 1990; Glynn 1988, 1991; Goreau et al. 1993; Goreau & Hayes 1994, 1995). The 1998 bleaching event was globally the most extensive such event recorded except in the Caribbean and Central Pacific where a comparison of year-byyear temperature and bleaching maps show that it was comparable with the largest previous events (T.G. et al., unpublished data). Global analyses of coral bleaching are rare, but critical to an understanding of the widespread ecological effect of bleaching events. |
| Tipo: Journal Contribution |
Palavras-chave: Coral reefs. |
| Ano: 2000 |
URL: http://hdl.handle.net/1834/416 |
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| Alcolado, P. M.; Hernández Muñoz, D.; Caballero, H.; Busutil, L.; Perera, S.; Hidalgo, G.. |
| En arrecifes coralinos del suroeste de Cuba, se evaluaron los impactos de la inusitada frecuencia e intensidad de huracanes entre el 2001 y el 2007, y de las enfermedades de corales, ambos factores asociados al cambio climático. En las crestas arrecifales, la reducción de la cobertura de coral duro vivo varió de nula a 21%, mientras que la reducción del diámetro máximo promedio de los corales varió de 16 a 40 cm. En los arrecifes frontales, la reducción de la cobertura de coral varió de nula a 14%, mientras que la reducción del diámetro máximo promedio varió de nula a 26 cm. Sin embargo, en todos los sitios se observaron grandes cambios en el predominio numérico de las especies. En las crestas, este se desplazó de Acropora palmata y otros corales duros a... |
| Tipo: Journal Contribution |
Palavras-chave: 1462; Hurricanes; Weather; Diseases; Coral reefs; Hurricanes; Weather; Coral reefs; Diseases; Http://aims.fao.org/aos/agrovoc/c_11650; Http://aims.fao.org/aos/agrovoc/c_15292; Http://aims.fao.org/aos/agrovoc/c_1880; Http://aims.fao.org/aos/agrovoc/c_49879. |
| Ano: 2009 |
URL: http://hdl.handle.net/1834/4094 |
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| Öhman, M.C.; Isidore, M.; Payet, R.J.; Robinson, J.; Marguerite, M.A.. |
| Many coral reef fish species aggregate at specific times and locations for the purpose of spawning. This study examined the spatial and temporal distribution of spawning aggregations in the Seychelles. An interview-based survey of the principal stakeholders, mainly artisanal fishers, yielded 89 reports of aggregation fishing for 26 demersal and semi-pelagic fish species. Grouper aggregations were largely concentrated in the outer coralline islands of the exclusive economic zone, whilst those of snappers and rabbitfishes were mainly reported from locations on the Seychelles Bank. The spatial patterns among fish families were attributed to a combination of differences in species abundance and distribution as well as variation in fishing effort. Spawning... |
| Tipo: Journal Contribution |
Palavras-chave: Coral reefs; Reef fish; Spawning. |
| Ano: 2004 |
URL: http://hdl.handle.net/1834/1142 |
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| Kaunda-Arara, B.; Rose, G.A.; Muchiri, M.S.; Kaka, R.. |
| Analysis of long-term (1978–2001) marine fisheries data showed that Kenyan coralreefs produced an estimated 2–4 metric t/km2/year of demersal fish. A rapid overall decline in landings occurred during the 1990s. Yields (t/km2/year) showed bimodal peaks in 1982 (2.98) and 1991 (2.90). The average total landings dropped by 55% during the last decade following peak landings in 1982. Landings of the commercially important families (e.g., Siganidae, Lethrinidae, Lutjanidae and Serranidae) declined by about 40% during the last decade, with the groupers (Serranidae) showing the steepest (72%) decline. Analysis of landings per administrative district showed a 78% decline in the densely populated Mombasa district between the periods 1983–1991 and 1992–2001. The less... |
| Tipo: Journal Contribution |
Palavras-chave: Coral reefs; Reef fish. |
| Ano: 2003 |
URL: http://hdl.handle.net/1834/959 |
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| Kimani, E.N.. |
| Coral reefs are a prominent feature of the East African coastline and associated islands. The Kenya-Tanzania coastline stretches from 1°30'S, at the Somali border to approximately 10°S at the Mozambique border. The Seychelle Islands extend from 5°S to 10°S and 45°E to 56°E (Fig. 1). The climate along the East African coast is dominated by seasonal monsoon winds (northeast monsoon from No-vember to February and southeast monsoon from March to October) and the equatorial currents dictated by the intertropical convergence zone. The narrow East African continental shelf supports fringing and patch reefs which lie 0.5 to 2 km offshore. General profiles of East African coasts are given in Table 1. Gaps in the reefs occur near river mouths notably Tana, Athi and... |
| Tipo: Journal Contribution |
Palavras-chave: Coral reefs. |
| Ano: 1995 |
URL: http://hdl.handle.net/1834/633 |
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| Registros recuperados: 203 | |
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