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JOURNAL OF PLANKTON RESEARCH | VOLUME 19 | NUMBER 1 | PAGES 113-124 | 1997
© Oxford University Press
research-article |
Production of Oikopleura dioica (Appendicularia) following a picoplankton ‘bloom’ in a eutrophic coastal area
National Institute for Environmental Studies Tsukuba, Ibaraki 305, Japan 1College of Agriculture and Veterinary Medicine Nihon University Fujisawa, Kanagawa 252, Japan
Received on April 26, 1996; accepted on September 2, 1996
The ecological importance of the appendicularian Oikupleura dioica as a picoplankton predator and a metazoan secondary producer was assessed in summer 1995 in the Seto Inland Sea, Japan. Just after the collapse of a red tide of Gymnodinium mikimotoi, the abundances of bacteria and picocyanobacteria increased rapidly and attained values of 
and 
, respectively. Concurrent with a subsequent sharp decrease in picoplankton abundance, the abundance and biomass of O.dloica increased drastically, and reached levels of 57 individuals 
and 
respectively. During this period, the carbon-based growth rate of O.dioica was estimated by a bottle incubation experiment The value was very high (1.66 
) for a metazoan and its production was comparable with that of copepods reported previously in the Seto Inland Sea in summer. A carbon budget analysis indicates that ingesting picoplankters as main food sources, O.dioica grew rapidly and its biomass attained the high value. Furthermore, the sharp decrease in picoplankton abundance was at least partly attributable to the ingestion by O.dioica.
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