Articles | Volume 16, issue 22
Biogeosciences, 16, 4411–4428, 2019
https://doi.org/10.5194/bg-16-4411-2019
Biogeosciences, 16, 4411–4428, 2019
https://doi.org/10.5194/bg-16-4411-2019
Research article
20 Nov 2019
Research article | 20 Nov 2019

Net heterotrophy and carbonate dissolution in two subtropical seagrass meadows

Bryce R. Van Dam et al.

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Cited articles

Barrón, C., Duarte, C. M., Frankignoulle, M., and Borges, A. V.: Organic carbon metabolism and carbonate dynamics in a Mediterranean seagrass (Posidonia oceanica) meadow, Estuar. Coasts, 29, 417–426, https://doi.org/10.1007/BF02784990, 2006. 
Bosence, D. W. J.: Biogenic Carbonate Production in Florida Bay, Bull. Mar. Sci., 44, 419–433, 1989. 
Bosence, D. W. J., Rowlands, R. J., and Quine, M. L.: Sedimentology and budget of a Recent carbonate mound, Florida Keys, Sedimentology, 32, 317–343, https://doi.org/10.1111/j.1365-3091.1985.tb00515.x, 1985. 
Bouillon, S., Dehairs, F., Velimirov, B., Abril, G., and Borges, A. V.: Dynamics of organic and inorganic carbon across contiguous mangrove and seagrass systems (Gazi Bay, Kenya), J. Geophys. Res.-Biogeo., 112, 1–14, https://doi.org/10.1029/2006JG000325, 2007. 
Brodersen, K. E., Trevathan-tackett, S. M., Nielsen, D. A., Macreadie, P. I., and Durako, M. J.: Oxygen Consumption and Sulfate Reduction in Vegetated Coastal Habitats : Effects of Physical Disturbance, Front. Mar. Sci., 6, 1–13, https://doi.org/10.3389/fmars.2019.00014, 2019. 
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We report on direct measurements of net ecosystem productivity (NEP) and net ecosystem calcification (NEC) in a Florida Bay seagrass ecosystem. We found notable differences between our carbon-based NEP and similar determinations made using oxygen. Over the study period, both NEP and NEC were negative, revealing that these sites are net heterotrophic and have dissolved CaCO3. Our findings point to sediments maintaining negative NEP and NEC despite high seagrass above-ground primary production.
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