Preliminary report of the Hakuhō Maru cruise KH-83-4 (BIOMASS) : Nov. 22, 1983-Feb. 24, 1984 : the Southern Ocean and the Antarctic Sea / by the scientific members of the Expedition ; edited by Takahisa Nemoto, Makoto Terazaki.

Errata slip inserted.

Includes bibliographical references.

Preface -- Outline of the cruise -- Hydrographic characteristics -- Continuous measurements of sea surface temperature and salinity -- Geochemical studies of chemical substances in seawater and air in the Southern Ocean Area -- Chemical studies of the Antarctic Ocean -- Geochemical studies of organic matter in the Antarctic Ocean -- Phytoplankton studies of the Southern Ocean -- Effect of temperature on photosynthesis activity in Antarctic phytoplankton -- Phytoplankton standing crop and photosynthesis activity at the oceanic fronts in the Southern Ocean -- Taxonomy and ecology of nannoplankton -- Ecology of zooplankton and micronekton -- Distribution and abundance of amphipods and brachyuran larvae (Crustacea) -- Zooplankton sampling and a phytoplankton culture experiment conducted during the Hakuhō Maru Cruise KH-83-4 -- Ammonium uptake measurement by the ¹⁵N technique -- Distribution of heterotrophic bacteria -- Bacterial abundance and production rate in the Antarctic Ocean -- Decomposition of chitin by bacteria -- Assimilation activity of bacteria in the Antarctic Ocean -- Physio-ecological study on oligotrophic bacteria in the Antarctic Ocean -- Acoustic survey of Antarctic krill and other organisms -- Sighting records of sea birds -- Gravimetry and bathymetry.

“The BIOMASS (Biological Investigations of Marine Antarctic Systems and Stocks) programme has been conducted in the Antarctic Ocean since 1977 as a ten year international project for the study of the ‘Antarctic ecosystem and its living resources’. The BIOMASS programme has had two highlights of multiship co-operative studies in 1980/81 (FIBEX) and 1983-1985 (SIBEX: Second International BIOMASS Experiment). This cruise of the Hakuhō Maru formed the SIBEX phase-I (1983/84) activity in the Pacific sector of the Antarctic along with another ship, the Umitaka Maru of the Tokyo University of Fisheries. The studies carried out on the Hakuhō Maru include those on the Antarctic pelagic ecosystem and its dynamics especially on krill dominating waters. Studies on the interaction among krill, copepods, salps, phytoplankton, bacteria and larger predators have been successfully carried out. Some new approaches on the ecology of bacteria, and an assessment of krill abundance are also worked out. Besides 30 scientists from 9 organizations, one formal observer (from the People’s Republic of China) to the Japanese Antarctic operation joined the cruise.” -- Preface by Takahisa Nemato, Chief Scientist, page iii.

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