The temporal variation of ATP concentration as an indictor of total microorganism biomass in Funka bay [Japan]
1999
Yanada, M. (Hokkaido Univ., Hakodate (Japan). Faculty of Fisheries) | Maita, Y. | Kudo, I.
The temporal variation of ATP concentration was elucidated in order to clarify the temporal variation of total microorganism (Phytoplankton, microzooplankton and bacteria) biomass in funka Bay, subarctic coastal region, from pre-bloom to post-bloom. The ATP content during the pre-bloom showed nearly homogeneous vertical distribution with lower values. In contrast, the ATP concentration during spring bloom showed high values at the upper 50 m depth, and decreased with depth. The ATP concentration at the upper 50 m depth during the post-bloom were also comparable to those during the spring bloom. These results implied that the total microorganism biomass was remarkably varied both temporally and vertically in Funka Bay. Judging from the combinations of Chl a/ATP ratio, POC/ATP ratio and POC/Chl a ratio, the high ATP contents during the spring bloom were mainly due to phytoplankton produced actively in the euphotic zone, and the high ATP concentration during the post-bloom were greatly caused by the biomass of living sub-micron organisms; e.g., bacteria
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