They found that coral colonies on reefs less than 35-feet (10-meters) deep in the Florida Keys were more closely related to corals at the same depths in the USVI, over a thousand miles away. Studies show that corals release approximately half of the photosynthetic products (organic matter) provided by zooxanthellae into the water in the form of mucus, while they use the rest of the organic matter for growth and respiration (Crossland et al. 1980, Davies 1984, Muscatine 1984). Many dangers to coral reefs occur directly on the water but many also come from activities that occur on land, even those far from the coast. The pigment containing organisms are lost as temperature or stress level due to increased light reaches intolerable levels. Below are lifestyle changes that anyone can adopt that can make a difference for the health of our coral reefs. No matter where you live, near the coast or hundreds of miles away, there are several things that you can do to keep coral reefs healthy. By Julie Murphy (ABDO, Core Library, 2016) What can we learn about the health of an ecosystem through coral reefs? Coral reefs are that way, too, but for them, it’s a matter of life and death. Coral bleaching occurs when the single-celled algae vital for coral reef survival and known as symbiotic zooxanthellae are rejected from the coral, soft corals, some sponges and even Tridacna clams. This book takes readers into our warming oceans to learn why and how coral reefs are hurting, and why it’s a larger issue for the thousands of animals and humans who depend on its … The secret to the success of the coral reefs is commonly believed to be the “tight recycling of nutrients” in the system, particularly in the corals, in which tiny plants and animals live together in a symbiosis that conserves key nutrients quite effectively.

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