CORDIO Status Report 2002.pdf

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Sea level rise cm 60 40 20 Rubble is extremely abundant and shows geographical patterns. The western edge of the Chagos Bank has smaller rubble, suggesting a more advanced state of erosion. Smaller rubble (more advanced erosion) also occurs in larger atolls. Of probable importance, but so far unmeasured here or elsewhere, is the fact that further erosion of rubble will create large quantities of sand. The importance of this here is the question whether this increased sand will assist maintenance of islands via 2000 2020 2040 2060 2080 2100 year Egmont atoll Sea level rise 1 Ile Sipaille 60 40 seaward 100 200 300 400 lagoon cm 20 Ile Lubine 2000 2020 2040 2060 2080 2100 year 1 Figure 3. Sea level rise prediction (taken from IPCC, 2001). seaward 100 200 300 400 lagoon 2 Ile Sudest 1 lagoon 100 200 seaward Figure 4. A remnant of Acropora palifera on a seaward reef slope. The standing skeleton shows the depth to which substrate has been removed. Figure 5. Profiles of islands of Egmont atoll drawn for survey transects carried out in 1972/3. Numbers are all metres. Redrawn from unpublished charts loaned from M. Hirons. 206
uild-up of beaches. However, at some locations, chutes of scoured substrate indicate that much of this newly created rubble is being carried into deeper water. Shores and Island Profiles Fig. 5–7 show profiles of several islands, measured in the 1970s. Remarkably, most of them show elevated rims surrounding a depression which reaches to near sea level or even below it. It was noted that the absolute elevation above a sea level datum was not accurately fixed, but discussion with the chief surveyors has allowed the x-axes of these profiles to be adjusted approximately to present high tide level. Spring tidal range here is approximately 1 m. The central depressions of these islands are sometimes marked and are clearly obvious even on thickly vegetated islands. Formed possibly by solution by mildly acidic rain acting on the basic limestone rock, the de- Great Chagos Bank Great Chagos Bank Danger Is. Middle Brother 2 1 1 100 200 300 400 3 North Brother 2 Eagles Is. 1 2 1 1 100 200 300 400 500 600 100 200 300 Sea Cow 2 Eagles Is. 2 2 1 1 100 200 300 400 500 600 700 100 200 300 400 Figure 6. Profiles of islands of the Great Chagos Bank drawn for survey transects carried out in 1975. Numbers are all metres. Redrawn from Baldwin (1975). Figure 7. Profiles of islands of the Great Chagos Bank drawn for survey transects carried out in 1975. Numbers are all metres. Redrawn from Baldwin (1975). 207
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Coral Reef Degradation in the India
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Coral Reef Degradation in the India
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Contents Foreword 7 Executive Summa
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Foreword In addition to being magni
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Executive Summary Since the 1998 co
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REEFS OF THE GULF OF MANNAR AND NIC
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Part I East Africa 13
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MORTALITY AND RECOVER AFTER THE 199
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Table 2. Area and date for reportin
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Obura, D., Suleiman, M., Motta, H.,
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Table 1. The geographic positions (
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changes are minor and show slight i
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mean number/m 2 mean number/m 2 10
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% 90 80 70 60 50 40 30 20 10 0 Tuti
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In Misali there are very few reprod
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observed to induce a shift in the c
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20 Corallimorpharian cover (%) 15 1
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Table 2. Proportions of corallimorp
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corallimorpharians in terms of bent
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Seawater Temperature on Shallow Ree
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ing Southeast (SE) monsoon (May-Oct
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31 Coral settlement density Seawate
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Jokiel, P. L., & Guinther, E. B., (
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50 40 Southern coast Parks Fished C
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30 Sites Quadrats/site 8 Adults/m 2
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Latitude (degrees) -1.7 -1.8 -1.9 -
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Obura, , D. O., Uku, J. N., Wawiye,
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people live within Mozambique’s 4
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Percentage cover 60 50 40 30 20 10
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Pereira, M. A. M., Gonçalves, P. M
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later converted into percentage cov
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Table 2. The substrate cover of the
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Percentage cover 100 90 80 70 60 50
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a) Filamentous algae Hypnea sp. Fil
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Participatory Monitoring of an Arti
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for management purposes and scienti
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ever, suffer from the presence of t
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Traps 100 y z Gill nets Handlines H
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250 m 2 at highly fished sites (sim
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Table 6. Interpretation of correlat
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The success of any management inter
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BACKGROUND Kleypas et al. (1999) as
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50 y = -0.5989x + 45.87 R 2 = 0.495
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Table 4. Species Reproductive strat
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Schleyer, M. H., Obura, D., Motta,
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Coral Reef Degradation in South Asi
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al.; 1999, Wilkinson et al., 1999).
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tance of reef fisheries in India, s
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working group is preparing specific
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scientific data and results can be
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The Conservation Status of Coral Re
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Table 1. Study sites in Andaman and
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K (Competitors) 10 90 20 80 30 70 4
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phologies in each of the three adap
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Table 4. Mortality index, relative
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Sheppard, C. R. C., (1988) ‘Simil
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Figure 1. Fixing of coral fragments
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Table 1. List of species of hard co
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Status of the Coral Reefs of Maldiv
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Table 2. Reef Check data showing 19
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Figure 5. Large colonies of Acropor
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Spatial and Temporal Patterns of Co
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Figure 2. The three sites in Vaavu
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No coral spat/plate (0.04 m≤) No
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Percent cover 100% 80% 60% 40% 20%
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frequency (no/m≤) 20 15 10 5 0 Fe
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Assessing Bioerosion and Its Effect
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16 weight removed by bioerosion (%)
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Status Report on the Condition of R
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During the immediate post-bleaching
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spp.), caught on the coral reefs in
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Figure 7. Recolonisation by Acropor
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activities. Such problems are the m
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Reef Fisheries and Coral Reef Degra
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southern Sri Lanka. Before 1998 the
Page 151 and 152: Table 3. Spiny lobster catches in W
Page 153 and 154: No. of fishermen 12 8 4 0 Negombo W
Page 155 and 156: Gerald, R., Allen, R., Steene, C.,
Page 157 and 158: THE ORNAMENTAL FISH COLLECTION AND
Page 159 and 160: positive correlations between fish
Page 161 and 162: of September, and packing lists fro
Page 163 and 164: REFERENCES Andrews, C., (1990) ‘T
Page 165 and 166: Future Effects of Climate Change on
Page 167 and 168: which operated on multi-decadal tim
Page 169 and 170: elevation in Maldives is only 5 m,
Page 171 and 172: The predicted warming will produce
Page 173 and 174: IPCC (1997) The Regional Impacts of
Page 175 and 176: 2001 Bleaching on Acropora Dominate
Page 177 and 178: Daily mean SST anomaly (°C) 1.5 1.
Page 179 and 180: nb of cells per g of biodetritus 30
Page 181 and 182: Status of Coral Reefs at Réunion,
Page 183 and 184: Geyser bank, located between Mayott
Page 185 and 186: was now observed (25%) for stations
Page 187 and 188: pacted large areas of coral reef in
Page 189 and 190: Table 1. Study Sites Location of th
Page 191 and 192: ABUNDANCE OF DIADEMA SETOSUM The de
Page 193 and 194: Table 5. Total number of genera obs
Page 195 and 196: Table 9. Summary of indicator fish
Page 197 and 198: ACKNOWLEDGMENTS We are very gratefu
Page 199 and 200: Chagos Archipelago Peros Banhos Sal
Page 201: 30.0 29.5 29.0 28.5 deg C 28.0 27.5
Page 205 and 206: Figure 9. Eroded rim of the island
Page 207 and 208: Sheppard, C. R. C., (1999b) ‘Cora
Page 209 and 210: Table 1. Overview of the 40 coral r
Page 211 and 212: Transects were placed at an oblique
Page 213 and 214: RESULTS Scleractinian Live Hard Cor
Page 215 and 216: Mean % live hard coral cover 10 5 0
Page 217 and 218: partly confounded due to the signif
Page 219 and 220: Table 6a. (continued) Type Site No.
Page 221 and 222: Table 6a. (continued) Type Site No.
Page 223 and 224: Figure 15. Recent Acropora sp. recr
Page 225 and 226: sampled was calculated at 9.4 + 0.4
Page 227 and 228: Harriott, V. J., & Fisk, D. A., (19
Page 229 and 230: growth, and to recover reef habitat
Page 231 and 232: The quantified fish surveys on the
Page 233 and 234: cussed on obtaining a video record
Page 235 and 236: arely exposed at low tide, and are
Page 237 and 238: 50 Outer reef families 40 Percent 3
Page 239 and 240: 7241 86 14 0 950 24 72 4 81 93 1437
Page 241 and 242: that there may have been several co
Page 243 and 244: Roberts, C. M., Hawkins, J. P., McA
Page 245 and 246: Economic Analysis of Coral Bleachin
Page 247 and 248: Table 1. Comparison of cost and ben
Page 249 and 250: changes. In the Seychelles case stu
Page 251 and 252: ents questioned in Zanzibar came in
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Table 3. Regression results for res
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Table 5. WTP Estimates for Kenya, Z
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Coral Reef Rehabilitation: Feasibil
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Since Kiunga is remote, with low or
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4000 Pavona spp. 4000 Porites spp.
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DISCUSSION AND CONCLUSIONS Recruits
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Obura, D. O., Uku, J. N., Wawiye, O
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such as increased penetration of so
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Table 1. Filter specifications for
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Table 2. The percentage cover of th
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Adresses to Authors S. Ahamada BP 1
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Jelvas M. Mwaura CORDIO East Africa
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