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标题：Role of macroscopic particles in deep-sea oxygen consumption
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作者：Alexander B. Bochdansky ; Hendrik M. van Aken ; Gerhard J. Herndl 等
期刊名称：Proceedings of the National Academy of Sciences
印刷版ISSN：0027-8424
电子版ISSN：1091-6490
出版年度：2010
卷号：107
期号：18
页码：8287-8291
DOI：10.1073/pnas.0913744107
语种：English
出版社：The National Academy of Sciences of the United States of America
摘要：Macroscopic particles (>500 {micro}m), including marine snow, large migrating zooplankton, and their fast-sinking fecal pellets, represent primary vehicles of organic carbon flux from the surface to the deep sea. In contrast, freely suspended microscopic particles such as bacteria and protists do not sink, and they contribute the largest portion of metabolism in the upper ocean. In bathy- and abyssopelagic layers of the ocean (2,000-6,000 m), however, microscopic particles may not dominate oxygen consumption. In a section across the tropical Atlantic, we show that macroscopic particle peaks occurred frequently in the deep sea, whereas microscopic particles were barely detectable. In 10 of 17 deep-sea profiles (>2,000 m depth), macroscopic particle abundances were more strongly cross-correlated with oxygen deficits than microscopic particles, suggesting that biomass bound to large particles dominates overall deep-sea metabolism.
关键词：ecology ; video analysis ; marine snow ; Atlantic ocean