Abstract
Methane (CH4) and dimethylsulphoniopropionate (DMSP) are major carbon and sulfur sources for bacterioplankton in the ocean. We investigated the characteristics of CH4 and DMSP in the southern Yap Trench from sea surface to hadal zone in June 2017. We found that concentrations of CH4 varied from 1.5 to 4.5 nmol/L with saturation between 94% and 204% in the euphotic layer. Concentrations of dissolved DMSP (DMSPd) ranged from 0.5 to 3.7 nmol/L with higher values in surface water and decreased with depth. Concentrations of particulate DMSP (DMSPp) varied from 0 to 13.6 nmol/L. Concentrations of total DMSP (DMSPt) ranged 2.0–15.2 nmol/L. Their concentrations decreased slightly and reached consistent levels in 200–3 000-m depth due probably to heterotrophic bacterial production in marine aphotic and high-pressure environments. An exception occurred around 4 000-m depth where their concentrations increased considerably and then decreased in deeper water. This previously unrecognized phenomenon sheds light on the elevated concentrations of DMSP in the abyssal layer that might be affected by the Lower Circumpolar Deep Water (LCPW). Concentrations of CH4 in seawater of the Benthic Boundary Layer of the southern Yap Trench were slightly higher than those in the water column at approximate depth, and concentrations of DMSP in seawater of the Benthic Boundary Layer of the southern Yap Trench were not much higher than those in the water column at the approximate depth, indicating that sediment was a weak source of CH4 but was not a source of DMSP for seawater in the study area. This study presented clear correlations between CH4 and DMSP from sea surface to sea bottom, proving that DMSP might be a potential substrate for CH4 not only in oxic surface seawater but also in deep water.
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Data Availability Statement
The data are available online (https://doi.org/10.6084/m9.figshare.16699066).
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Acknowledgment
We are grateful to Wei CAO from Marine Bioresource and Environment Research Center, the First Institute of Oceanography, Ministry of Natural Resource for sample collecting and to Haorui LIANG from South China Environment Monitoring Center, State Oceanic Administration for constructive comments.
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Supported by the National Key Research and Development Program of China (No. 2022YFC2803803), the National Natural Science Foundation of China (No. 42076040), the National Basic Research Program of China (973 Program) (No. 2015CB755904), and the 111 Project (No. B13030)
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Huang, Y., Sun, C., Lü, L. et al. Characteristics of vertical distributions of methane and dimethylsulphoniopropionate in the southern Yap Trench. J. Ocean. Limnol. 41, 2101–2116 (2023). https://doi.org/10.1007/s00343-022-2063-8
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DOI: https://doi.org/10.1007/s00343-022-2063-8