Fluxes of Amino Acid and Hexosamine in Sinking Particles in Subarctic and Arctic Coastal Regions |
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Authors: | Shinji Hashimoto Yoshiaki Maita |
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Institution: | (1) Department of Fisheries Oceanography and Marine Science, Faculty of Fisheries, Hokkaido University, Hakodate 041-8611, Japan |
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Abstract: | Spatial and temporal variations in the vertical fluxes of amino acids and hexosamine were studied at coastal sites in the
south of the Chukchi Sea, Otsuchi Bay, and the center and the entrance of Funka Bay. Amino acid fluxes were higher in the
upper trap than in the lower trap material, but hexosamine fluxes were opposite to amino acid fluxes. The ratios between protein
amino acids (Asp, Glu and Arg) and their decomposition products (β-Ala, γ-Aba and Orn) indicate that the labile organic matter
was more abundant in the upper traps than in the lower ones and increased during periods of enhanced amino acid fluxes. The
ratios of Ser/Gly did not vary temporally and spatially and were nearly constant, indicating that Ser and Gly were preserved
in a stable form within sinking particles. Hexosamine/amino acid ratios of these particles were higher in the lower sediment
trap than in the upper trap material. This implies that the sinking particles derived from zooplankton are relatively more
abundant in deep layers than in the surface layer in the water column. We suggest that the difference in amino acid flux and
the composition between the upper and lower trap material is influenced by the processes of microbial decomposition and zooplankton
consumption of sinking particulate organic matter.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | Amino acid hexosamine particle flux subarctic and arctic coastal regions |
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