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JPR Advance Access published online on February 15, 2006
Journal of Plankton Research, doi:10.1093/plankt/fbi141
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© The Author 2006. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org
Received April 1, 2005
Accepted February 13, 2006

Article

A new hydrostatic pressure apparatus for studies of marine zooplankton

Tomoko Yoshiki 1 *, Tatsuki Toda 1, Teruaki Yoshida 1, and Akio Shimizu 1

1 Department of Ecological Engineering for Symbiosis, Faculty of Engineering, Soka University Tangi-cho, Hachioji, Tokyo 192-8577, Japan

* To whom correspondence should be addressed.
Tomoko Yoshiki, E-mail: tyoshiki{at}soka.ac.jp


  Abstract

A new design of hydrostatic pressure apparatus for studying marine zooplankton is described. Zooplankton occur throughout the water-column and are exposed to a range of hydrostatic pressures throughout their lifetime. The hydrostatic pressure apparatus developed in this study make it possible (1) to increase pressure gradually from 1 to 200 atm, (2) to prevent corrosion of the pressure chamber by introducing a specimen holder that separates the pressure chamber from the surrounding seawater and (3) to observe a wide size range of zooplankton including eggs (100-10000 µm size range). The new apparatus is useful for the study of mesozooplankton thoughout their life history from egg to adult.

The effects of hydrostatic pressure on the eggs of the calanoid copepod, Calanus sinicus, were examined using the new hydrostatic pressure apparatus. Hydrostatic pressure did not affect C. sinicus egg development time, but egg hatching success decreased significantly with increasing pressure. Most of the nauplii that hatched under high pressure conditions (10, 50 and 100 atm) were deformed. Eggs of C. sinicus did tolerate pressures of 10 atm. This implies that eggs would not survive if they did not hatch within the upper 100 m.

Communicating Editor: RP Harris


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