Abstract


MULTIPL DRIVING FACTORS EXPLAIN SPATIAL AND TEMPORAL VARIABILITY IN CORAL CALCIFICATION RATES ON THE BERMUDA PLATFORM

Experimental studies have shown that coral calcification rates are dependent on light, nutrients, food availability, temperature and seawater &Omegaar, but the relative importance of each parameter in natural settings remains uncertain. In this study we applied a Calcein dye as time indicators within the skeleton of coral colonies across the northern Bermuda coral reef platform and evaluated the correlation between seasonal average growth rates with temperature, light and seawater &Omegaar in an effort to decipher the relative importance of each parameter. We also placed small coral colonies in chambers and measured the instantaneous rate of calcification under light and dark treatments. The results showed that skeletal growth, whether hourly or seasonal, appeared highly sensitive to &Omegaar. Using short-term light and dark incubations we show, however, how the co-variance of light and &Omegaar can lead to the false conclusion that calcification is more sensitive to &Omegaar. For the seasonal data, we assessed the impact of the observed average differences in temperature (4.0 ̊C), light (5.1 mol photons m-2 d-1) and &Omegaar (0.16 units) on coral calcification rates based on established relationships derived from laboratory studies and found that they could account for approximately 44&percent, 52&percent and 5&percent, respectively, of the observed seasonal change of 81±14 mmolCaCO3 m-2 d-1.

Authors

Venti, A. M., University of Miami, USA, aventi@rsmas.miami.edu

Langdon, C., University of Miami, Rosenstiel School of Marine and Atmospheric Sciences , USA, clangdon@rsmas.miami.edu

Details

Oral presentation

Session #:36
Date: 06/23/2016
Time: 14:15
Location: 306 A/B

Presentation is given by student: No