Processes affecting the spatial distribution of seagrass meadow sedimentary material on Yao Yai Island, Thailand

Quak, M.; Ziegler, Alan D.; Benner, S. G.; Evans, Samuel Lewin; Todd, Peter A.; Gillis, Lucy Gwen; Vongtanaboon, Sukanya; Jachowski, Nick; Bouma, Tjeerd J.

doi:10.1016/j.ecss.2016.09.018

Cited by 8 publications

(2 citation statements)

References 53 publications

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“…That study, however, analyzed stocks scaled to 1 m from short cores and did not account for mangrove contribution to bulk OM. Other studies in Southeast Asian seagrass sediments also tended to report low ranges in OC stocks (e.g., Gillis et al, 2017; Miyajima et al, 2015; Quak et al, 2016), though there were exceptions (Alongi et al, 2016; Stankovic et al, 2021). The estimated stocks reported in the current study should be considered the most up to date for Sungai Pulai estuary.…”

Section: Discussionmentioning

confidence: 94%

Macroalgal and mangrove provenances demonstrate their relevance in contributing to the blue carbon pool of a tropical seagrass meadow

Hidayah

Arina

et al. 2021

Ecological Research

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Mangroves, seagrasses and macroalgae form inter-connected coastal habitats.They are involved in the direct and indirect sequestration and accumulation of blue carbon and are recognized for their role in climate change mitigation.Macroalgae, though residing within or in close proximity to these ecosystems are, however, not perceived as contributing to blue carbon storage. Such habitat connectivity among the mangrove, seagrass, and macroalgal compartments complicates a straightforward assessment of blue carbon storage. In this study, we assessed the contributions of these macrophytes as endmembers to the bulk organic carbon (OC) stocks in surficial (top 30 cm) and deep (31-100 cm) sediment layers of seagrass beds within the Sungai Pulai estuary (Malaysia).Organic carbon stocks in the seagrass sediments ranged from 14.3 to 21.4 Mg OC ha À1 (surficial depths), and 137.9 ± 23.3 (mean ± SE) Mg OC ha À1 for the deep layer. Mangrove-derived matter contributed a maximum of 65% to the bulk OC pool. The existence of downcore variability indicated that macroalgae contributed up to 16% and were higher than seagrass sources (12%). Our results suggest that macroalgal-derived and mangrove-derived organic matter are important contributors to OC sequestration in the estuary. In view of the heterogeneous OC pool that contributes to bulk OC stocks, placing importance on only one OC source may construe an incomplete profile of habitat-specific capacity for OC storage. This has wider implications for understanding OC subsidies, the effects of which are particularly relevant when one considers the impacts of coastal land use changes on blue carbon storage.

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Section: Discussionmentioning

confidence: 94%

Macroalgal and mangrove provenances demonstrate their relevance in contributing to the blue carbon pool of a tropical seagrass meadow

Hidayah

Arina

et al. 2021

Ecological Research

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“…Even though previous studies on the sources and dispersal of SOM in the GOT were mainly focused only on the nearshore in the upper GOT (e.g., Quak et al., 2016) or lower GOT (e.g., Meksumpun et al., 2005), and few studies focusing on human impacts in the upper GOT (e.g., Singkran, 2013; and Wattayakorn, 2012) with limited information available on the distribution and composition of SOM in the open sea under the control of tropical climate and hydrodynamic conditions. Therefore, the main objectives of the present study were: (a) to elucidate the distribution of SOM over the GOT both in bulk and molecular indicators with high spatial‐resolution coverage, (b) to identify origins of SOM in the GOT sediments, and (c) to highlight the role of hydrodynamic forcing on the transport and accumulation of SOM in this tropical coastal sea and its implication of the depositional environment on the export and heterogeneity of SOM.…”

Section: Introductionmentioning

confidence: 99%

Impact of Source Variability and Hydrodynamic Forces on the Distribution, Transport, and Burial of Sedimentary Organic Matter in a Tropical Coastal Margin: The Gulf of Thailand

Bai

et al. 2021

JGR Biogeosciences

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More than 80% of organic carbon (OC) is buried in estuarine continental shelves, affecting the global carbon balance (Hedges & Keil, 1995). Therefore, the distribution, sources, and migration of sedimentary organic matter (SOM) on the continental shelves are important for understanding the source-to-sink processes Abstract Carbon cycling in the tropical margin is more extensive compared with other regions of the world. The goal of this study was to better understand the origins, transport, and burial of sedimentary organic matter (SOM) in the Gulf of Thailand (GOT) from the coastal margin of Southeast (SE) Asia, which serve as a major depository of fine-grained sediments and the associated organic carbon (OC). The results revealed a variety of organic matter (OM) inputs and the selective transport of fine sediment, resulting in preferential dispersal of terrigenous SOM in the GOT. Bulk OC indices with low carbon/ nitrogen ratios and enriched stable carbon isotope ratios (−24.2‰ to −20.4‰, and mean −21.4 ± 0.56‰) are likely related to the presence of marine-derived OM and anthropogenic interference. A binary mixing model further clarified the significant contributions of terrestrial derived-OM within the upper and central GOT. The n-alkane compositions and principal component analysis indicated that a majority of the terrigenous SOM settles within the estuary in the upper GOT, while a selective dispersal of land-based SOM through long-distance transport toward the modern depocenter in the lower GOT. The characteristics of lower molecular weight n-alkanes also suggest anthropogenic OM input from petroleum-related contributions. Altogether, the depositional patterns and spatial heterogeneity of the SOM indicated by both the bulk and molecular signatures reveal the important roles of source variability and the selective dispersal of land-based OM on the supply and accumulation of OC in the tropical coastal margin. Plain Language SummaryThe accumulation and fate of sedimentary organic carbon (OC) in the tropical coastal system are significant components of the global carbon cycling. In order to elucidate the distribution and accumulation of organic matter (OM) in tropical regimes, this study first explored the concentration and composition of sedimentary OC based on the bulk and molecular-level data, and then depicted the modern transport pattern of OM in the Gulf of Thailand (GOT). This study showed terrestrial input accounted for 5%-64% (20% ± 8% on average) of the OM and dominated in the upper GOT, the offshore depocenter in the northeastern GOT and north of Samui Island. Molecular composition of n-alkanes and principal component analysis result showed that the hydrodynamic condition plays a significant role on the selective dispersal of terrigenous OM from the coastal region to the offshore depocenter. In addition, the contribution from petroleum-derived OM is also revealed based on the molecular-level evidences. The spatial heterogeneity of OM revealed the variability of the sources and hydrodynamic forces on acc...

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Carbon stores from a tropical seagrass meadow in the midst of anthropogenic disturbance

Rozaimi

Fairoz

Hakimi

et al. 2017

Marine Pollution Bulletin

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Processes affecting the spatial distribution of seagrass meadow sedimentary material on Yao Yai Island, Thailand

Cited by 8 publications

References 53 publications

Macroalgal and mangrove provenances demonstrate their relevance in contributing to the blue carbon pool of a tropical seagrass meadow

Macroalgal and mangrove provenances demonstrate their relevance in contributing to the blue carbon pool of a tropical seagrass meadow

Impact of Source Variability and Hydrodynamic Forces on the Distribution, Transport, and Burial of Sedimentary Organic Matter in a Tropical Coastal Margin: The Gulf of Thailand

Carbon stores from a tropical seagrass meadow in the midst of anthropogenic disturbance

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