AI Article Synopsis
- * Recent analysis of sediment cores revealed that higher sedimentation rates were recorded during peak years of sargassum influx, leading to increased carbon burial rates.
- * This study is the first to investigate the relationship between sargassum influx, mass accumulation rates, and carbon burial in seagrass sediments, suggesting the need for ongoing monitoring in the future.
Article Abstract
Seagrass meadow sediments are efficient organic carbon (C) sinks and can store C for hundreds of years. The temporal variation of C burial rates and stocks over recent decades at nearshore seagrass meadows in the Puerto Morelos Reef Lagoon, Mexico, was evaluated in Pb-dated sediment cores from nearshore meadows dominated by Thalassia testudinum. The sediments were predominantly sandy (>52% sand) rich in carbonate grains (11.8-12.5% C) with minor C (0.24-1.12%) and N (0.02-0.13%) concentrations. The C:N ratio (9.4-13.0) indicated that marine-derived C was prevalent. C stocks in the upper 30 cm sediment were 15.9 ± 3.0-24.8 ± 4.6 Mg ha. Sedimentary mass accumulation rates (MAR) (0.7-1.5 g cm yr) were higher than those previously recorded in seagrass sediments from the reef lagoon and other parts of the world. The highest MAR values, recorded in 2015 (±0.13) and 2018 (±0.03), coincided with the peak sargassum influx years. MAR and C burial rates (11.4-133 g m yr) were correlated (r = 0.76), indicating that the massive influxes of sargassum have accelerated C burial rates in the region since 2015. This study marks the initial evaluation of the interaction between the massive influx of sargassum, MAR, and C burial rates in seagrass sediments, potentially laying the groundwork for future extended monitoring initiatives.
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| http://dx.doi.org/10.1016/j.marenvres.2024.106875 | DOI Listing |
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- * This study is the first to investigate the relationship between sargassum influx, mass accumulation rates, and carbon burial in seagrass sediments, suggesting the need for ongoing monitoring in the future.
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