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  • 1
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    The Reefs of Mauritius (2005)
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    Publication Date: 2021-05-19
    Description: The study investigated whether the coral reefs of Mauritius had suffered a mass bleaching event during 1998 as had been reported for other Indian Ocean reefs. Sea-surface temperature (SST) anomaly charts produced by NOAA show that SST was raised 1o C - 1.25o C above the climatological maximum for this region during February 1998, but the extent of bleaching around Mauritius was thought not to be severe, but was not recorded. A rapid assessment of the degree of coral bleaching on reefs around the whole coast of Mauritius was made during April 1999. Surveys were conducted while snorkelling and SCUBA diving and assessments made by direct observation, underwater video transects and underwater photography. Video was analysed to confirm the results from the field surveys. Results were displayed within a Geographical Information System (GIS). Meteorological data for the period between January 1997 and April 1999 were also analysed. The results indicate that the coral reefs in Mauritius were still healthy, but that all sites showed some signs of degradation particularly from boat and anchor damage and cyclone damage. The coral reefs of Mauritius do appear to have escaped the mass bleaching event of 1998. There were no large areas of dead standing coral other than on Barrier Reef off Mahebourg. Mean bleaching was 〈10% at all sites and in all cases represented only partial bleaching of colonies. It is suggested that Mauritius escaped the mass bleaching event due to the effect of cyclone Anacelle, which produced wet and cloudy unsettled weather during February 1998. The minor bleaching episode observed during this survey is thought to be a frequent and normal event relating to large environmental fluctuations experienced within the lagoons. With the potential threat of increasing mass coral bleaching events, it is suggested that Mauritius needs to act quickly to protect its coral reefs from further degradation.
    Keywords: Coral reefs
    Repository Name: AquaDocs
    Type: Preprint
    Format: 219714 bytes
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  • 2
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    Measuring Change and Recovery in Reef Ecosystems (2005)
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    Publication Date: 2021-05-19
    Description: Assessing environmental impacts and monitoring ecosystem recovery requires an understanding of the underlying spatial and temporal changes that have occurred. There are three main questions to be answered with specific reference to the Indian Ocean and the current status and future of coral reef ecosystems: i) what are the effects of widespread coral mortality going to be in the Indian Ocean, ii) how long will it take for reef ecosystems to recover, and iii) will ‘recovered’ systems have the same structure and functional integrity? Research into these questions must bear in mind that most measurements to be made are points on a long-term trend. Although there may be another disturbance event similar to that of 1998, its occurrence (if it occurs) should not negate the work, but provide further data points which contribute to the understanding and establishment of long-term trends.
    Description: Unpublished
    Keywords: Coral reefs
    Repository Name: AquaDocs
    Type: Working Paper , Non-Refereed
    Format: 133105 bytes
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  • 3
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    The Reefs of the Granitic Islands of the Seychelles (2005)
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    Publication Date: 2021-05-19
    Description: The status of coral reefs in the granitic islands of the Seychelles archipelago has been assessed by two independent surveys following the mass mortality caused by the 1997/98 bleaching event. Engelhardt (2000), working in collaboration with the Seychelles Department of Conservation surveyed 15 sites located mainly on the north west coast of Mahe during November and December 1999. During January 2000, Turner, Klaus, Hardman and West, working in collaboration with the Seychelles Marine Park Authority, surveyed 46 reef sites mainly to the east of Mahe, including Ste Anne, Ile Moyenne, Ile Cerf, Cousine, Praslin, Curieuse, La Digue, Grand Soeur and Felicite. Reefs around the granitic islands are shallow and rarely exceed 15 m depth. Both surveys aimed to assess reef structure over the full depth range, with corals identified to genus and species where possible, and assessed reef recovery by recording new colonies believed to have established since the bleaching event.
    Keywords: Coral reefs
    Repository Name: AquaDocs
    Type: Preprint
    Format: 145583 bytes
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  • 4
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    Initial Considerations on Methods to Survey Reef Status and Recovery (2005)
    CORDIO/SAREC.
    Details
    Publication Date: 2021-05-19
    Description: Published
    Keywords: Coral reefs
    Repository Name: AquaDocs
    Type: Book Section , Non-Refereed
    Format: 129742 bytes
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