深層水による低次生物量の増殖技術の開発

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We tried a new approach to develop substantial amounts of phytoplankton-derived carbon biomass using incubations of unaltered deep-sea waters from 100 m, 400 m and 700 m depths in Suruga Bay, Japan. Incubations were run in 20 to 30 liters polycarbonate bottles for 11 days in 2002 and for 14 days in 2003, in land-based incubators under attenuated natural irradiance and at ambient temperature. Nutrients declined rapidly in all incubations. Nitrate (initially the main species of nitrogen) was depleted about midway through both incubations but silicate and phosphate were never depleted until the end. Diverse blooms of phytoplankton dominated by diatoms developed in all incubations except for controls. Phytoplankton carbon biomass increased by as much as 3-4 orders of magnitude. Bacteria and heterotrophic nano- and picoflagellates biomasses also increased during incubations but their contributions to living carbon biomasses were lower than phytoplankton in most of the incubations. Zooplankton developed sporadically but during their peak biomasses, their contribution to total living carbon biomasses was greater than phytoplankton. Particulate organic carbon (POC) also increased by as much as 2 orders of magnitude. The development of POC was not exclusively determined by the development of phytoplankton carbon. Our results demonstrate that incubations of unaltered deep-sea water are useful for generating substantial phytoplankton biomass of different size and species composition for ecological and physiological studies.
2005-04-30

深層水による低次生物量の増殖技術の開発

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