Some ecological factors affecting coral reef assemblages off Hurghada, Red Sea, Egypt | بعض العوامل ابيئية المؤثرة على الشعاب المرجانية المواجهة لمنطقة الغردقة ، البحر الأحمر ، مصر
2005
Mohamed, T.A.A. | Mohamed, A.M.
This journal is published by NIOF, Alexandria, Egypt
Show more [+] Less [-]Three shallow reef sites were investigated during four seasons Autumn, 2003, Winter, Spring and Summer, 2004) off the Marine Biological Station at Hurghada, Red Sea, Egypt. Thirty-eight scleractinian coral species were recorded at the studied sites. Generally, Twenty-six species were affected by more than one factor (such as high temperature, solar radiation, sedimentation and algae), while the last twelve species remained healthy. The affected species (26 species) were divided into the following: five species were affected by combination of high temperature and direct exposure to solar radiation during the neap tide, eleven species only were affected by sedimentation and increasing algal cover and ten species were affected by high temperature, solar radiation, sedimentation and algae all together. Coral bleaching and death in some cases were due to these factors. Galaxea fascicularis, Seriatopora hystrix and Millepora dichotoma were partially bleached but recovered during the high tide time within weeks. Few species such as Acropora granulosa, Montipora venosa, Goniastrea pectinata and Porites solida were completely bleached and could not recover but died. Repeated leaching events in the future may expose corals to an increasingly hostile environment.
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