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Marine Ecology Progress Series

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MEPS 431:11-24 (2011)  -  DOI:

Differing utilization of glucose and algal ­particulate organic matter by deep-sea benthic organisms of Sagami Bay, Japan

Hidetaka Nomaki*, Nanako O. Ogawa, Yoshinori Takano, Hisami Suga, Naohiko Ohkouchi, Hiroshi Kitazato

Institute of Biogeosciences, Japan Agency for Marine–Earth Science and Technology (JAMSTEC), 2-15 Natsushima-cho, Yokosuka 237-0061, Japan

ABSTRACT: The fate of particulate and dissolved organic carbon in deep-sea benthic organisms was evaluated by in situ 13C-labeling experiments in the central part of Sagami Bay, Japan (water depth: 1453 m). 13C-labeled glucose and Chlorella sp. (Chlorophyta) were injected into a series of in situ culture cores and incubated for 0 to 9 d. Glucose was chosen as an example of labile dissolved organic matter in the pore water, and Chlorella sp. as an example of fresh algal material. Incorporation of both carbon sources by benthic foraminifera and metazoans was determined based on enrichment in 13C of their bulk tissues. Archaeal incorporations were also evaluated by examining 13C-labeled lipid biomarkers. Chlorella sp. incorporation by foraminiferal species ranged from 0.0 to 40% of their biomass. Foraminiferal ingestion of algal materials varied markedly among the same species depending on body size or individual differences. All species incorporated glucose to similar extents, ranging from 0.1 to 0.3% of their biomass. Many foraminiferal species incorporated glucose faster than Chlorella sp. After 9 d of in situ incubation, 26.4, 1.7, 0.1, and 3.8% of added Chlorella sp. was detected in the bulk sediment, foraminiferal biomass, examined metazoan biomass, and respired CO2, respectively. The figures for glucose were 5.3, 0.04, 0.00, and 4.6%, respectively. Labile dissolved organic matter may serve as an accessible food source for benthic organisms and is quickly mineralized on the deep seafloor.

KEY WORDS: Benthic foraminifera · Dissolved organic matter · Particulate organic matter · Benthic ecosystem · Carbon budget · In situ tracer experiment

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Cite this article as: Nomaki H, Ogawa NO, Takano Y, Suga H, Ohkouchi N, Kitazato H (2011) Differing utilization of glucose and algal ­particulate organic matter by deep-sea benthic organisms of Sagami Bay, Japan. Mar Ecol Prog Ser 431:11-24.

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