Articles | Volume 16, issue 22
https://doi.org/10.5194/bg-16-4411-2019
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-16-4411-2019
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
20 Nov 2019
Research article |
| 20 Nov 2019
| 20 Nov 2019
Net heterotrophy and carbonate dissolution in two subtropical seagrass meadows
Center for Coastal Oceans Research, Department of Biological Sciences,
Florida International University, 11200 SW 8th St, Miami, FL 33199, USA
Institute of Coastal Research, Helmholtz-Zentrum Geesthacht (HZG),
Geesthacht, 21502, Germany
Christian Lopes
Institute of Coastal Research, Helmholtz-Zentrum Geesthacht (HZG),
Geesthacht, 21502, Germany
Christopher L. Osburn
Department of Marine, Earth, and Atmospheric Sciences, North Carolina State
University, 2800 Faucette Drive, Raleigh, NC 27695, USA
James W. Fourqurean
Institute of Coastal Research, Helmholtz-Zentrum Geesthacht (HZG),
Geesthacht, 21502, Germany
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The study highlights the inter-seasonal variability of the carbonate dynamics of the East Frisian Wadden Sea, the world's largest intertidal area. During spring, increased biological activity leads to lower CO2 and nitrate levels, while total alkalinity (TA) rises slightly. In summer, TA increases, enhancing the ocean's ability to absorb CO2. Our research emphasizes the vital role of these intertidal regions in regulating carbon, contributing to a better understanding of carbon storage.
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We quantified sediment–water exchange at shallow sites in the North and Baltic seas. We found that porewater irrigation rates in the former were approximately twice as high as previously estimated, likely driven by relatively high bioirrigative activity. In contrast, we found small net fluxes of alkalinity, ranging from −35 µmol m−2 h−1 (uptake) to 53 µmol m−2 h−1 (release). We attribute this to low net denitrification, carbonate mineral (re-)precipitation, and sulfide (re-)oxidation.
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Short summary
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.
We report on direct measurements of net ecosystem productivity (NEP) and net ecosystem...
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