マスダ ヨシキ   Yoshiki Masuda
  益田 芳樹
   所属   川崎医療福祉大学  医療福祉学部 臨床心理学科
   職種   特任教授
論文種別 原著
言語種別 英語
査読の有無 査読あり
表題 Extant and fossil sopngiofauna from the underwater Academichan Ridge of Lake Baikal(SE Siberia).
掲載誌名 正式名:Memoirs of the Queensland Museum
ISSNコード:00798835
巻・号・頁 44,651-657頁
著者・共著者 Weinberg Elena, Eckert C., Mehl D., Muller J., Masuda Yoshiki, Efremova Sofia
発行年月 1999
概要 Sediments of Lake Baikal contain unique and highly diverse siliceous assemblages. Sponge spicules and diatom frustules are both well preserved and abundant. A bottom sediment core STX3GC (4.8m long) was taken from the Academician Ridge using a gravity corer and studied at intervals of 10cm. At discrete intervals sediments consisted of 10-30% by weight of biogenic silica. Major contributors were diatoms, which are a good tool for straigraphic assignments. Sponges were also widely distributed in space and time, and may also be valuable stratigraphic markers in Lake Baikal, in addition to their important ecological role. Analysis of core STX3GC revealed 4 genera of Lubomirskidae consisting of 9 species, together with scattered mega- and microscleres of Spongilla sp. and Ephydatia sp. (Spongillidae). Spicule abundance and diversity were highest during periods of warm climate, whereas during cold intervals Spongilla sp. and Swartscheskia papyracea spicules were missing, and abundance and diversity of other spicules also significantly decreased. These observed morphometric changes may be applied in tracing paleoecological and climatic changes in Lake Baikal during the Holocene and Pleistocene, or even earlier, and spicules of new species may hold information on the evolution of Lubomirskiidae and their probable spongillid roots.