TY - JOUR
T1 - Patchwork silicification and disposal activity of siliceous fragments of a polycystine radiolarian
AU - Suzuki, Noritoshi
AU - Ogawa, Kazuhiro
AU - Ogane, Kaoru
AU - Tuji, Akihiro
N1 - Funding Information:
Professor Taniel Danelian (Lille 1 University) kindly gave constructive advice before acceptance. The manuscript was much improved following constructive remarks by R.O. Anderson and an anonymous reviewer. Kenji R.M. Matsuzaki helped to prepare the French abstract, and David Lazarus and T. Danelian helped to improve the English. N. Suzuki presented this study in the special meeting “Geobiology and Environments of Siliceous Biomineralizers” held in the Lille University by The Micropalaeontological Society, with traveling support by the Tohoku University Global GCOE Program “Global Education and Research Center for Earth and Planetary Dynamics”. This study is a result of the 11th Observation Tour of Living Radiolarians at Sesoko Island, hosted by Atsushi Matsuoka (Niigata University). We are greatly indebted to Yoshikatsu Nakano (Ryuku University) for help with the sampling work. We extend our appreciation to Yoshie Kaneshiro (Osaka City University), Yurie Ishizu (Yamaguchi University) and Hiromichi Koyasu (Waseda University) and the other participants of the tour for their kind help with daily laboratory work. Additional observation data were also obtained with the financial support of the Cooperative Research Project with CNRS , “Morpho-molecular Diversity Assessment of Ecologically, Evolutionary, and Geologically Relevant Marine Plankton (Radiolaria)” by the Strategic International Research Cooperative Program hosted by the Japan Science and Technology Agency (N. Suzuki), and “Integrated Research on Biodiversity of Interspecies Relationships” by the National Museum of Nature and Science (A. Tuji).
PY - 2013/4
Y1 - 2013/4
N2 - In order to observe the silicification process of polycystine radiolarians, we tried to culture Streblacantha cf. circumtexta with the addition of dissolved silica (final concentration 10 μM) and f/2 culture medium from 25th, Nov. to 27th, Nov., 2009. During our session of observation, one cell of S. cf. circumtexta (Pylonioidea, Spumellaria) formed siliceous fragments in the extracapsulum part of the protoplasm, which were subsequently ejected. A total of 94 siliceous fragments were thus expelled from the cell by using the low-contrast thin (LCT) pseudopodia. Similar siliceous fragments were often found in the extracapsulum of many pylonioid spumellarians, suggesting they did also secret isolated siliceous fragments. Pylonioids may silicify continuously, and the normal growth rate of the siliceous skeleton is maintained by the disposal activity of excess silification.
AB - In order to observe the silicification process of polycystine radiolarians, we tried to culture Streblacantha cf. circumtexta with the addition of dissolved silica (final concentration 10 μM) and f/2 culture medium from 25th, Nov. to 27th, Nov., 2009. During our session of observation, one cell of S. cf. circumtexta (Pylonioidea, Spumellaria) formed siliceous fragments in the extracapsulum part of the protoplasm, which were subsequently ejected. A total of 94 siliceous fragments were thus expelled from the cell by using the low-contrast thin (LCT) pseudopodia. Similar siliceous fragments were often found in the extracapsulum of many pylonioid spumellarians, suggesting they did also secret isolated siliceous fragments. Pylonioids may silicify continuously, and the normal growth rate of the siliceous skeleton is maintained by the disposal activity of excess silification.
KW - Living radiolarians
KW - Physiological ecology
KW - Pseudopodia
KW - Silicification
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U2 - 10.1016/j.revmic.2013.04.002
DO - 10.1016/j.revmic.2013.04.002
M3 - Article
AN - SCOPUS:84881314799
SN - 0035-1598
VL - 56
SP - 63
EP - 74
JO - Revue de Micropaleontologie
JF - Revue de Micropaleontologie
IS - 2
ER -