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| Goreau, T.J.. |
| Mortality of corals in the Alphonse group following the 1998 bleaching event was somewhat less than in the high islands of the Mahegroup. Overall mortality of corals on fore reef slopes was around 90%in shallow water and around 70-80% on vertical slopes, in comparison to values around 95 and 99% in the inner islands. Although mortality of Acroporas was nearly total, several small surviving colonies were found at a range of depths including very shallow seagrasses. In contrast with the high islands, many partially surviving Pocilloporaverrucosa colonies were found. The major survivors were Helioporacoerula (rare in the inner islands), Porites head species (probablylutea), Porites cylindrica,Porites nigrescens, Astreoporamyriophthalma, Hydnophora microconos,... |
| Tipo: Journal Contribution |
Palavras-chave: Coral reefs. |
| Ano: 1998 |
URL: http://hdl.handle.net/1834/276 |
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| Goreau, T.J.. |
| Coral bleaching was assessed by underwater digital video in reefs at 14 locations around the Seychelles in late May 1998 as part of a continuing assessment of reef health with the Seychelles Marine Park Authority. Preliminary estimates are that around three quarters of all corals were recently dead, ranging from around 50% to over 90% at different sites. More precise measurements of mortality will be available later from detailed quantitative analysis of video records, but these will be underestimates of final mortality because many corals that were still partially alive at the time were still dying. The catastrophic mortality was due to excessively high sea surface temperatures, whose effect exceeds all previous threats to reefs to date. Strong... |
| Tipo: Report |
Palavras-chave: Coral reefs. |
| Ano: 1998 |
URL: http://hdl.handle.net/1834/896 |
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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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| Goreau, T.J.. |
| Digital video transects were filmed at nine coral reef locations around Mahe in March 1997, and at 14 locations including additional sites in Curieuse, Coco, La Digue, and Cousin in May1998 as part of at he Seychelles Marine Park Authority Monitoring program. This report describes preliminary observations made at 16 locations, including most of the previous sites and some new ones during early December1998. The first series of videos recorded the condition of the coral reef prior to the impact of coral bleaching, the second recorded conditions during the intense coral bleaching event of early 1998, and the current observations record conditions in the aftermath of the event, allowing the first accurate estimates of overall mortality and survivorship and of... |
| Tipo: Working Paper |
Palavras-chave: Coral reefs. |
| Ano: 1998 |
URL: http://hdl.handle.net/1834/283 |
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