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Porewater carbonate chemistry dynamics in a temperate and a subtropical seagrass system

Porewater carbonate chemistry dynamics in a temperate and a subtropical seagrass system
Porewater carbonate chemistry dynamics in a temperate and a subtropical seagrass system
Seagrass systems are integral components of both local and global carbon cycles and can substantially modify seawater biogeochemistry, which has ecological ramifications. However, the influence of seagrass on porewater biogeochemistry has not been fully described, and the exact role of this marine macrophyte and associated microbial communities in the modification of porewater chemistry remains equivocal. In the present study, carbonate chemistry in the water column and porewater was investigated over diel timescales in contrasting, tidally influenced seagrass systems in Southern California and Bermuda, including vegetated (Zostera marina) and unvegetated biomes (0–16 cm) in Mission Bay, San Diego, USA and a vegetated system (Thallasia testudinium) in Mangrove Bay, Ferry Reach, Bermuda. In Mission Bay, dissolved inorganic carbon (DIC) and total alkalinity (TA) exhibited strong increasing gradients with sediment depth. Vertical porewater profiles differed between the sites, with almost twice as high concentrations of DIC and TA observed in the vegetated compared to the unvegetated sediments. In Mangrove Bay, both the range and vertical profiles of porewater carbonate parameters such as DIC and TA were much lower and, in contrast to Mission Bay where no distinct temporal signal was observed, biogeochemical parameters followed the semi-diurnal tidal signal in the water column. The observed differences between the study sites most likely reflect a differential influence of biological (biomass, detritus and infauna) and physical processes (e.g., sediment permeability, residence time and mixing) on porewater carbonate chemistry in the different settings.
Blue carbon, Carbon cycling, Carbonate chemistry, Early diagenesis, Estuarine processes, Interstitial water, Ocean acidification, Sediment
1380-6165
375-399
Kindeberg, Theodor
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Bates, Nicholas R.
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Courtney, Travis A.
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Cyronak, Tyler
bf2d5ce4-d3b6-4dd3-85ee-21b73fa6695d
Griffin, Alyssa
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Mackenzie, Fred T.
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Paulsen, May-linn
af6632a1-2b21-4553-90ad-0e23c3a63f84
Andersson, Andreas J.
b07d71e9-2654-40ba-9c69-0775557bf7de
Kindeberg, Theodor
d7cf48a6-d639-4c2d-aa43-5d87c5c67486
Bates, Nicholas R.
2eb8c60d-41a7-4018-95e7-c02a9e4eb347
Courtney, Travis A.
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Cyronak, Tyler
bf2d5ce4-d3b6-4dd3-85ee-21b73fa6695d
Griffin, Alyssa
40467a68-bb63-4888-b99d-56cced3b6f0d
Mackenzie, Fred T.
02e63726-bde1-4934-93f7-8f2800e44324
Paulsen, May-linn
af6632a1-2b21-4553-90ad-0e23c3a63f84
Andersson, Andreas J.
b07d71e9-2654-40ba-9c69-0775557bf7de

Kindeberg, Theodor, Bates, Nicholas R., Courtney, Travis A., Cyronak, Tyler, Griffin, Alyssa, Mackenzie, Fred T., Paulsen, May-linn and Andersson, Andreas J. (2020) Porewater carbonate chemistry dynamics in a temperate and a subtropical seagrass system. Aquatic Geochemistry, 26 (4), 375-399. (doi:10.1007/s10498-020-09378-8).

Record type: Article

Abstract

Seagrass systems are integral components of both local and global carbon cycles and can substantially modify seawater biogeochemistry, which has ecological ramifications. However, the influence of seagrass on porewater biogeochemistry has not been fully described, and the exact role of this marine macrophyte and associated microbial communities in the modification of porewater chemistry remains equivocal. In the present study, carbonate chemistry in the water column and porewater was investigated over diel timescales in contrasting, tidally influenced seagrass systems in Southern California and Bermuda, including vegetated (Zostera marina) and unvegetated biomes (0–16 cm) in Mission Bay, San Diego, USA and a vegetated system (Thallasia testudinium) in Mangrove Bay, Ferry Reach, Bermuda. In Mission Bay, dissolved inorganic carbon (DIC) and total alkalinity (TA) exhibited strong increasing gradients with sediment depth. Vertical porewater profiles differed between the sites, with almost twice as high concentrations of DIC and TA observed in the vegetated compared to the unvegetated sediments. In Mangrove Bay, both the range and vertical profiles of porewater carbonate parameters such as DIC and TA were much lower and, in contrast to Mission Bay where no distinct temporal signal was observed, biogeochemical parameters followed the semi-diurnal tidal signal in the water column. The observed differences between the study sites most likely reflect a differential influence of biological (biomass, detritus and infauna) and physical processes (e.g., sediment permeability, residence time and mixing) on porewater carbonate chemistry in the different settings.

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Accepted/In Press date: 1 May 2020
Published date: 16 May 2020
Keywords: Blue carbon, Carbon cycling, Carbonate chemistry, Early diagenesis, Estuarine processes, Interstitial water, Ocean acidification, Sediment

Identifiers

Local EPrints ID: 444421
URI: http://eprints.soton.ac.uk/id/eprint/444421
ISSN: 1380-6165
PURE UUID: 7c6b15bb-7033-48fb-bd17-41bde9307585

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Date deposited: 19 Oct 2020 16:31
Last modified: 25 Nov 2021 21:08

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Contributors

Author: Theodor Kindeberg
Author: Nicholas R. Bates
Author: Travis A. Courtney
Author: Tyler Cyronak
Author: Alyssa Griffin
Author: Fred T. Mackenzie
Author: May-linn Paulsen
Author: Andreas J. Andersson

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