Acropora elseyi is a species of cnidarians in the family staghorn corals. Acropora elseyi formmarine reefs. They are broadcast spawners. They have no parental care.
Definition: An oceanic island, often having a characteristic ring-like shape surrounding a lagoon. Atolls are formed when coral reef grows around a volcanic island that later subsides into the ocean.
Definition: A group of species that exploit the same food resources, and/or use the same feeding or foraging methods. http://en.wikipedia.org/wiki/Guild_(ecology)