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MANICA, A; CARTER, R. W
Marine biology, 12/2000, Volume: 137, Issue: 5-6Journal Article
The taxonomic status of the Montastraea annularis species complex is unclear. Much evidence has been accumulated to support the separation into 3 species, but the presence of intermediate morphotypes and the apparent lack of effective reproductive barriers in some areas are yet unexplained. Several authors have made a call for the introduction of new traits that can be used to resolve differences among closely related coral species. We collected skeletal and tissue samples from corals within the M. annularis species complex (15 each of M. annularis, M. faveolata, and M. franksi) and 10 morphological intermediates from several reefs in the Florida Keys. Multivariate analysis of corallite skeletal measurements supported the separation of the species complex into three taxa. We detected two main fluorescence emission peaks at 480 nm (turquoise) and 515 nm (green) that were not distributed equally among the three species. Every M. annularis colony had a major turquoise fluorescence peak. Some had a weak green secondary fluorescence peak. Colonies of M. faveolata and M. franksi had either the green or turquoise fluorescence peak, but at significantly different frequencies. The intermediate morphotypes proved to be highly heterogeneous with respect to both micromorphology and fluorescence, and their nature could not be fully explained. We were not able to separate the three species using fluorescence characters alone, however this new trait does increase our understanding of the taxonomic structure within the M. annularis species complex.
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