Roles of Submicron Particles and Colloids in Microbial Food Webs and Biogeochemical Cycles within Marine Environments
Roles of Submicron Particles and Colloids in Microbial Food Webs and Biogeochemical Cycles within Marine Environments
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亚微米颗粒和胶体在海洋环境中微生物食物网和生物地球化学循环中的作用
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发表时间:
1997
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通讯作者:
D. Kirchman
中科院分区:
文献类型:
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作者:
T. Nagata;D. Kirchman
The recent discovery of numerous detrital submicron particles in diverse marine environments (Koike et al., 1990; Longhurst et al., 1992; Wells and Goldberg, 1991, 1994) has stirred the interest of oceanographers and has spurred studies into the roles of these small particles in marine food webs and biogeochemical fluxes. The abundance of non-living submicron particles (107–1010 particles ml−1) far exceeds the number of living particles of similar size dimensions, including phytoplankton, bacteria, and viruses (Koike et al., 1990; Wells and Goldberg, 1991; see Table I). Bulk chemical measurements have confirmed that the “colloidal fraction” (size, 0.001–1 μm) represents a large fraction (10–50%) of total “dissolved” organic carbon (DOC) in seawater (Ogawa and Ogura, 1992; Benner et al., 1992; Gau et al., 1994). Several provocative hypotheses have been proposed to explain the roles of colloids and submicron particles in trophic dynamics (Sherr, 1988; Flood et al., 1992), aggregate formation (Alldredge et al., 1993; Kepkay, 1994), and condensation of organic matter (Nagata and Kirchman, 1992b, 1996; Keil and Kirchman, 1994).