Ecology, biogeography and evolution of corals in Hawaii.

Recent studies in Hawaii have contributed much to the understanding of the ecology and evolution of Hawaiian corals and are forcing a reevaluation of our basic concepts concerning the zoogeography, ecology, taxonomy and population biology of these important reef-forming organisms. Geographic isolation rather than physical adversity of the environment seems largely to have determined the number of coral species that are found in Hawaii, but the physical environment controls growth of Hawaiian species with increasing latitude along the archipelago. Annual broadcast spawning has recently been shown to be the dominant mode of sexual reproduction, rather than brooding of larvae on a lunar cycle as previously believed. Asexual reproduction through colony fragmentation or by production of asexually produced larvae is now known to result in extensive representation of a single genotype in some coral populations.