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Estimating 3-dimensional colony surface area of field corals
COURTNEY, L. A., W. S. FISHER, S. RAIMONDO, L. M. OLIVER, AND W. P. DAVIS. Estimating 3-dimensional colony surface area of field corals . JOURNAL OF EXPERIMENTAL MARINE BIOLOGY AND ECOLOGY. Elsevier Science Ltd, New York, NY, 351(1-2):234-242, (2007).
Colony surface area is a critical descriptor for biological and physical attributes of reef-building (scleractinian, stony) corals. The three-dimensional (3D) size and structure of corals are directly related to many ecosystem values and functions. Most methods to estimate colony surface area have been limited to laboratory settings and cannot be used for field corals. Photographic methods for digital 3D reconstruction were applied here to determine the accuracy of three different approaches for estimating colony surface area of field corals from simple underwater measurements. The approaches include a volumetric size-class method, a hemispherical surrogate and a suite of log–linear models generated from stepwise multiple regression analyses of digitally-reconstructed colonies. For each approach, surface area values were calculated from field measurements of colony size and the accuracy was determined by comparison with digitally-derived values for the same colonies. Accuracy varied among approaches; log–linear models (12% difference) were most accurate, followed by the hemispherical surrogate (17% difference) and size-classes (40% difference). The log–linear and hemispherical surrogate approaches are potentially applicable to at least nine common coral species. The photographic reconstruction method, although time-consuming and not intended for routine application, was shown by comparison with laser-scanned images to provide a highly accurate method for determining 3D colony surface area.
Measurement methods of field corals.
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Record Details:Record Type: DOCUMENT (JOURNAL/PEER REVIEWED JOURNAL)
Organization:U.S. ENVIRONMENTAL PROTECTION AGENCY
OFFICE OF RESEARCH AND DEVELOPMENT
NATIONAL HEALTH AND ENVIRONMENTAL EFFECTS RESEARCH LAB
GULF ECOLOGY DIVISION
BIOLOGICAL EFFECTS AND POPULATION RESPONSE BRANCH