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- W4304128770 abstract "The coastal ocean is an important component of the global carbon budget and contains both terrestrial and internally produced organic matter. The use of specific organic compounds to estimate the origin of the carbon can improve understanding of organic material cycling in coastal ecosystems and the origins of food resources consumed by suspension feeders. In this study, samples of suspended particulate matter (SPM) in surface waters were collected in summer from the Harima-Nada, Seto Inland Sea, and spatial variations in the distributions of organic compounds were investigated and compared with that of chlorophyll as an indicator of primary production. High chlorophyll a (Chl a) concentrations were associated with riverine nutrient inputs in the northern Harima-Nada and with a tidal front in the south. Sterols, fatty acids, phytol, and lignin phenols were identified in the SPM samples. Short-chain fatty acids were dominant, with minor amounts of lignin phenols; this result indicates that the major carbon source of the SPM was aquatic organisms, especially microalgae. This interpretation is consistent with the bulk geochemical tracer results. Phytol showed a strong positive linear correlation with Chl a. The major sterols in the SPM samples were 4-methylsterols and 24-methylenecholesterol, which are derived mainly from dinoflagellates and diatoms, respectively. The strong correlation between phytosterol contents and Chl a indicates that total phytosterols reflect the total microalgal community abundance. The relative proportions of 4-methylsterols and other sterols were used to estimate the contributions of dinoflagellates and diatoms to Chl a: 34% of the total mean Chl a concentration was estimated to be derived from dinoflagellates and 66% from diatoms and other phytoplankton. This result is consistent with the reported occurrence of a red tide due to dinoflagellates on the day of observation." @default.
- W4304128770 created "2022-10-11" @default.
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- W4304128770 date "2022-11-01" @default.
- W4304128770 modified "2023-09-29" @default.
- W4304128770 title "Molecular composition of particulate organic matter in surface waters of the Harima-Nada, Seto Inland Sea, Japan" @default.
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- W4304128770 doi "https://doi.org/10.1016/j.rsma.2022.102685" @default.
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