GCRMN_COI_2017-Western Indian Ocean Reef Status

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Coral reef status report for the Western Indian Ocean (2017) Global Coral Reef Monitoring Network Plate left. Bleaching Assessment in Fumba, Zanzibar (May 2016) Photo credit: Pierre Perrie; right. Bleached coral in St Leu Reunion (March 2016) Photo credit: Julien Wickel A total of 699 observations were submitted online on the bleaching event, from 54 organisations and over 80 observers from seven different sectors (see section 1.3.7). The majority of contributors were from the NGO sector (27), and 329 observations were submitted by research programmes, with the majority of these coming from detailed studies in the BECOMING project (fig. 1.3.4). These results make it clear that monitoring and response observations need to be supported financially and by organizational structures, requiring investment and commitment of resources. REGIONAL CHAPTERS Figure 1.3.4. Number of contributors from each sector. CRMN - regional or national Coral Reef Monitoring Networks. Numbers above bars indicate the number of observations/records submitted by each group. 30
Coral reef status report for the Western Indian Ocean (2017) Global Coral Reef Monitoring Network 1.3.4 Results Bleaching was first reported unusually early around the Comoros archipelago at the start of January 2016 (fig. 1.3.5). The frequency of reports of severe bleaching increased after the 20th of March with reports from SW Madagascar, the Mascarene Islands (Reunion, Mauritius, Rodrigues), Tanzania and Seychelles. Severe bleaching peaked in April (and see fig. 1.3.6a) with continued observations from the southern locations and increasing reports in northern Tanzania, Kenya and the Seychelles. Bleaching started to dissipate in May with lingering severe bleaching in Kenya and Seychelles, and in most locations bleaching ceased by June and July. The progression of bleaching and mortality by month (fig. 1.3.6) shows over 40% of sites experiencing high or extreme bleaching in April, and this translated into peak mortality of about 15% of sites showing high or extreme bleaching in June. Figure 1.3.5. Monthly progression of bleaching reported by observers from around the WIO a Figure 1.3.6. Monthly breakdown of 2016 WIO (a) bleaching and (b) mortality observations submitted online. Categories are estimates of percentage coral cover bleached at a site, and the columns show the proportion of reports in each category. Numbers above the columns indicate the number of reports in each month. b REGIONAL CHAPTERS 31
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GCRMN_COI_2017-Western Indian Ocean Reef Status

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