#Status of Coral Reefs 2002 - International Coral Reef Action Network

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Status of Coral Reefs of the World: 2002 La Reunion There are now 14 monitoring Stations in 4 sectors, each with 2 monitoring sites: St Gilles-La Saline with Toboggan (healthy), and Planch’Alizes (disturbed); St Leu with Varangue a reference site, and Corne Nord, near the canal exit; Etang Salé a ‘classic reef site’; and St Pierre - Ravine Blanche (healthy) and Alizé Plage (disturbed). Coral cover and fish populations were relatively stable over 5 years at Saint Gilles-La Saline, with slight increases in coral cover on parts of the reef flat (around 30-38%), even though tropical cyclones ‘Dina’ and ‘Harry’ passed in early 2002. This is a balance between the degradation from human activities and new coral growth, with Acropora species being the dominant forms. There has been a slight decrease in coral cover on the outer slopes. Fish populations have also been relatively stable, with more butterflyfish and few predatory fish, even in protected zones, showing continued fishing pressures. Coral cover (%) on Reunion study sites. Sector Sites Cover 1999 2000 2001 2002 St Gilles Toboggan / Planch Hard Coral 35.5 32.4 37.9 37.9 Reef Flat Algae 15.3 31.5 18.8 29.4 Toboggan / Planch Hard Coral 40.6 44.7 44.2 36.4 Outer Slope Algae 45.5 45.0 45.9 52.2 St Leu Corne Nord / Varangue Hard Coral 54.1 50 55.9 49.8 Reef flat Algae 21.3 30.4 19.7 33.6 Corne Nord / Varangue Hard Coral 59.8 62.2 60.9 61.2 Outer Slope Algae 31.0 33.8 25.0 27.5 Etang Sale Bassin Pirogue Hard Coral - 50.3 44.1 - Reef flat Algae - 9.4 7.6 - Bassin Pirogue Hard Coral - 57.8 49.4 - Outer Slope Algae - 31.8 38.6 - St Pierre Ravine Blanche Hard Coral - 58.1 63.6 - Reef flat Algae - 18.9 0.0 - Ravine Blanche Hard Coral - 34.4 42.8 - Outer Slope Algae - 53.7 47.4 There is similar stability in coral cover on the outer slopes. There has been little change in coral cover (around 8% total) both at Toboggan (North reef) and Planch’Alizé (back reef). Fish populations, especially those in the higher trophic level (groupers, snappers, emperors) have decreased, even though this is a no-take reserve. The cyclones in early 2002 particularly affected the Saint Leu reef flat areas, after a series of other damaging events (bleaching, high sedimentation, low salinities). There was strong recovery in the coral communities to 40-50% coral cover by February 2002 (coral mortality 12-18%), but also about 10% increase in algal cover. There is higher coral cover on the outer slope, including the highest reported for Reunion (more than 70% coral cover at La Corne, and 45 to 50% at La Varangue). Algal cover is stable and moderate (
Status of Coral Reefs in the South West Indian Ocean Island Node Benthic cover (%) at Seychelles monitoring sites. SECTOR SITES Cover 1999 2000 2001 2002 Mahe – Middle reef Outer Slope Hard Coral 3.5 5.1 6.7 20.1 Bay Ternay Algae 0.0 2.6 0.2 1.2 Mahe – Ile aux Cerf Reef flat Hard Coral - - - 5.0 Ste Anne Algae - - - - Ile aux Cerf Outer Slope Hard Coral - - - 14.9 Algae - - - 40.3 Silhouette Island Silhouette Reef flat Hard Coral - 9.0 - - Algae - 0.5 - - Silhouette Outer Slope Hard Coral - 31.9 - - Algae - 0.5 - - Curieuse Island Anse Papaie Reef flat Hard Coral - - - 2.5 Algae - - - 9 Anse Papaie Outer Slope Hard Coral - - - 25.7 Algae - - - 0.2 Alphonse Island Oasis 1 Reef flat Hard Coral -- - - 57.2 Algae - - - 0.0 consists of large, coalescing coral colonies of compact, massive Porites (coral cover above 40%). Algal cover is relatively low (
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Status of Coral Reefs of the World:
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FOREWORD Our two governments have r
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CONTENTS Countries, States and Terr
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COUNTRIES, STATES AND TERRITORIES A
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Countries, States and Territories S
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INTRODUCTION We are pleased to endo
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Introduction Some of the larger fou
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Introduction Coral reefs are coming
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EXECUTIVE SUMMARY CLIVE WILKINSON A
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Executive Summary This report, howe
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Executive Summary GLOBAL AND REGION
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Executive Summary There is clear ev
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Executive Summary Key sites chosen
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Executive Summary • Europa and Sc
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Executive Summary CORAL REEF TARGET
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Executive Summary ICRI OPERATING UN
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Executive Summary COLLAPSE OF CORAL
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Executive Summary Prognosis for the
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Executive Summary concern is an out
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Executive Summary Southern Tropical
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Executive Summary Achievements in E
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Status of Southeast Asia Coral Reef
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8. STATUS OF CORAL REEFS IN EAST AN
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Status of Coral Reefs in East and N
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9. STATUS OF CORAL REEFS OF AUSTRAL
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Status of Coral Reefs of Australasi
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10. STATUS OF CORAL REEFS IN THE SO
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Status of Coral Reefs in the Southw
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12. STATUS OF THE CORAL REEFS IN MI
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Status of the Coral Reefs in Micron
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13. STATUS OF CORAL REEFS IN THE HA
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Status of Coral Reefs in the Hawaii
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14. STATUS OF CORAL REEFS IN THE U.
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Status of Coral Reefs in the US Car
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15. STATUS OF CORAL REEFS IN THE NO
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Status of Coral Reefs in the Northe
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16. STATUS OF CORAL REEFS OF MESOAM
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Status of Coral Reefs of Mesoameric
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17. STATUS OF CORAL REEFS IN THE EA
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Status of Coral Reefs in the Easter
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18. STATUS OF CORAL REEFS IN SOUTHE
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Status of Coral Reefs in Southern T
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19. SPONSORING ORGANISATIONS, CORAL
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Sponsoring Organisations, Coral Ree
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#Status of Coral Reefs 2002 - International Coral Reef Action Network

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