Download Fisheries Biology, Assessment and Management, Second Edition by Michael King(auth.) PDF

April 5, 2017 | Environmental Engineering | By admin | 0 Comments

By Michael King(auth.)

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Corals in many areas have been affected by bleaching, a condition in which the corals’ zooxanthellae are lost due to stress. Without the pigmentation of the zooxanthellae, the corals appear white and eventually die if the factors causing the stress are prolonged for more than a few weeks. Bleaching appears to be occurring on individual reefs (localized bleaching events) as well as on reefs over large geographic areas of the world (mass bleaching events). Although various abnormal environmental conditions will cause coral bleaching, elevated sea surface temperatures have been implicated in its present widespread occurrence (Glynn, 1993; Brown, 1997).

Without the pigmentation of the zooxanthellae, the corals appear white and eventually die if the factors causing the stress are prolonged for more than a few weeks. Bleaching appears to be occurring on individual reefs (localized bleaching events) as well as on reefs over large geographic areas of the world (mass bleaching events). Although various abnormal environmental conditions will cause coral bleaching, elevated sea surface temperatures have been implicated in its present widespread occurrence (Glynn, 1993; Brown, 1997).

The Mariana Islands, for example, are formed on the western margin of the Mariana Trench and other volcanic arcs include the Aleutian Islands in the North Pacific and the Leeward and Windward Islands in the Caribbean, all of which lie adjacent to deep ocean trenches. The movement of lithospheric plates creates unstable areas at their boundaries (Fig. 15) where earthquakes are common. Earthquakes occur at all plate boundaries and those created at convergent boundaries are often the most powerful.

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