Marine Science Faculty Publications

Community Metabolism in Shallow Coral Reef and Seagrass Ecosystems, Lower Florida Keys

Document Type

Article

Publication Date

2015

Keywords

Calcification, Coral reef, Florida Keys, Production, Seagrass

Digital Object Identifier (DOI)

https://doi.org/10.3354/meps11385

Abstract

Diurnal variation of net community production (NEP) and net community calcification (NEC) were measured in coral reef and seagrass biomes during October 2012 in the lower Florida Keys using a mesocosm enclosure and the oxygen gradient flux technique. Seagrass and coral reef sites showed diurnal variations of NEP and NEC, with positive values at near-seafloor light levels >100-300 μ Einstein m-2 s-1. During daylight hours, we detected an average NEP of 12.3 and 8.6 mmol O2 m-2 h-1 at the seagrass and coral reef site, respectively. At night, NEP at the seagrass site was relatively constant, while on the coral reef, net respiration was highest immediately after dusk and decreased during the rest of the night. At the seagrass site, NEC values ranged from 0.20 g CaCO3 m-2 h-1 during daylight to-0.15 g CaCO3 m-2 h-1 at night, and from 0.17 to-0.10 g CaCO3 m-2 h-1 at the coral reef site. There were no significant differences in pH and aragonite saturation states (Oar) between the seagrass and coral reef sites. Decrease in light levels during thunderstorms significantly decreased NEP, transforming the system from net autotrophic to net heterotrophic.

Citation / Publisher Attribution

Marine Ecology Progress Series, v. 538, p. 35-52

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