Coral reefs and bleaching phenomenon
Coral reefs and bleaching phenomenonImagine yourself observing one of the most diverse ecosystems on earth. Thousands of species of plants and animals provide a dizzying array of color and motion. Massive structures provide a canopy that shelters hundreds of exotic species in a myriad of microclimates. As land-based observers, we almost automatically assume that this is a description of the rich ecosystem of a tropical rainforest. However, if we take ourselves off the safety of dry land and immerse ourselves in the ocean, we will find an equally dynamic environment in the depths of our world�s coral reefs. As a Zoology major, I quickly decided to explore this biological component of the ocean environment. In the following paper, I will provide a general overview of coral reefs and examine the alarming depletion of coral and their ecological symbionts in a process known as coral bleaching.
As mentioned earlier, coral reefs are among the most diverse and productive of all communities on Earth. They are also the largest biological structures on the planet. The Great Barrier Reef, along the eastern coast of Australia, covers over 2000 kilometers and is said to be visible from the moon (Goreau, 1987). While the size of coral reefs can be enormous, their real impact is on a much smaller scale. Reefs function as food and shelter for fish and marine invertebrates. While the coral itself is an animal, through a symbiotic relationship with the unicellular algae, coral becomes the primary producer in its ocean ecosystem (Richmond 1993). The reefs are formed by calcium carbonate deposits produced by the coral polyps. According to the legendary Cousteau, in his book The Ocean World, tube worms and mollusks also donate their hard skeletons to the architecture of the growing reef (174). Biologically active compounds are also produced by reef dwelling organisms and posses antimicrobial and antiviral properties (Van Alstyne 1988). In fact, coral produces a natural sunscreen that is currently marketed and also holds promise in generating chemicals for AIDS and cancer research. In 1995, researchers mimicked the structural components of coral and now use the patented super hard compound to repair shattered human bones (Alderage 1995). Further more, coral reefs are naturally extremely productive fishing grounds. In fact, healthy reefs produce up to 10-100 times more yield per unit area than deep-sea fishing (Goreau, 1987). These are just a sample of the multitude of resources coral provides their own ecosystem and the economic markets of humans.
Sometimes growing from a single polyp, a colony of thousands of similar polyps is soon established through sexual and asexual reproduction. The sheer vastness of a coral reef provides many other benefits. Coral reefs are crucial land builders in tropical areas, forming islands and altering continental shorelines. Coastlines are also protected from erosion as the reefs dampen harsh incoming waves. This is vital...
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