The consequences of this trend for reef-associated communities are currently unclear, but expected to be profound. "Our research helps bring coral reefs in line with what we know from many other ecosystems –from seagrass beds to forests and grasslands," said Lefcheck, now Tennenbaum Coordinating Scientist for the Smithsonian’s MarineGEO program. This means that diverse groups of herbivores keep algae at bay more effectively. If seaweeds take hold, they prevent corals from re-establishing and can take over in their place. An advantage of giving equal weighting to all species is that common species or highly abundant populations do not have a disproportionate influence on the index trajectory. Most angelfish have anal and dorsal fins that extend past the tip their tail fins, while most butterflyfish do not. This grazing is especially important following reef disturbances, such as hurricanes and coral bleaching events. and sponges that grow from the hard coral base and contribute to the diversity and structural complexity of the reef.
"The fieldwork was carried out by Rasher in collaboration with Bob Steneck, scientist at University of Maine, and Ruben Torres, president of Reef Check Dominican Republic. Other prominent invertebrate groups include crustacea, mollusca and holothuria, including Diadema antillarum, a key algal herbivore. They also counted the number of baby corals present on the reef. Shifts to seaweed beds are difficult to reverse and have become common in the Caribbean, where corals have declined on average by 80 percent over the last 40 years.Scientists previously determined that different fish species favor consuming different algae. The blue-striped grunt has obvious blue stripes that may appear to be outlined in a darker blue upon close examination. Coral reef diversity. You can see groupers in a variety of sizes, from a few inches to several feet, and in almost every imaginable color and pattern.These fish hunt by hanging vertically next to sea fans and branching coral. This helps to distinguish angelfish from butterflyfish.Butterflyfish of all species can be distinguished from angelfish, which also have rounded, flat, disc-like bodies, by the length of their anal and dorsal (top and bottom) fins. The model also enabled them to make more accurate comparisons among reefs by accounting for the influence of environmental differences that exist from site to site.As these fish graze, they scrape tiny turf algae and seaweeds from the reef, keeping spaces free of algae and primed for the settlement of baby corals. "This research shows that fostering fish diversity — both at the local and regional scale — is more important than we realized to the health of coral reefs. "This research shows that fostering fish diversity -- both at the local and regional scale -- is more important than we realized to the health of coral reefs.
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