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Seasonality in the Benthic Foraminiferal Community and the Life History of Trochammina Hadai Uchio in Hamana Lake, Japan

  • Satoshi Matsushita
  • Hiroshi Kitazato
Chapter
Part of the NATO ASI Series book series (ASIC, volume 327)

Abstract

Trochammina hadai Uchio is a dominant species in brackish waters of Japan. The life history of this species was investigated in Hamana Lake, central Japan. Samples were collected by SCUBA diving at a fixed station and on a monthly basis from 1987 to 1989. On these occasions, we also monitored water temperature, salinity and dissolved oxygen content.

Trochammina hadai lives in the top 1 cm of the sediment throughout the year. Its population density drastically changed from nearly 0 individuals/10cm2 during the summer to 830 individuals/10cm2 in the winter. The change in the density was closely related to the environmental conditions of the lake. Lake water had stagnated during summer, forming a vertical stratification with a bottom layer of low oxygen values and a high concentration of hydrogen sulfide in sediment.

The life cycle of T. hadai is yearly and biphasic. The microspheric generation mainly rises in spring and summer, whereas the megalospheric generation was found mostly in autumn. In the laboratory, higher growth rates were observed in juvenile (58 µm/month) than in adult specimens (34 µm/month).

In both, micro and megalospheric specimens, two morphotypes were distinguished in T. hadai. One type is relatively high trochospiral, has a lobate periphery and 4–5 chambers in the final whorl. The other is low trochospiral, has a smooth periphery and 5–7 chambers in the final whorl. Transitional types produced both morphotypes during different stages of their development. The seasonal change in morphotypes within the same specimen suggests that environmental parameters control the gross morphology in T. hadai.

Keywords

Bottom Water Benthic Foraminifera Dissolve Oxygen Content Dead Individual Test Diameter 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media Dordrecht 1990

Authors and Affiliations

  • Satoshi Matsushita
    • 1
  • Hiroshi Kitazato
    • 1
  1. 1.Institute of GeosciencesShizuoka UniversityShizuokaJapan

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