Small diatoms from Lake Shinji-ko and Lake Nakaumi 1. Morphology and distribution of <i>Chaetoceros minimus</i> (Levander) D.Marino <i>et al.</i>

• HIROSE Kotaro

  Graduate School of Symbiotic Systems Science and Technology, Fukushima University

• GOTOH Toshikazu

  Division of Basic Medical Science, Faculty of Medicine, Kinki University

• OHTANI Shuji

  Department of Education, Shimane University

Bibliographic Information

Other Title

• 宍道湖・中海水系の微細珪藻1. <i>Chaetoceros minimus</i>（Levander） D.Marino <i>et al.</i>の形態と分布
• 宍道湖・中海水系の微細珪藻(1)Chaetoceros minimus (Levander) D. Marino et al.の形態と分布
• シンジコ ・ ナカノウミ スイケイ ノ ビサイ ケイソウ(1)Chaetoceros minimus (Levander) D. Marino et al.ノ ケイタイ ト ブンプ

Abstract

Morphological characteristics of a planktonic diatom Chaetoceros minimus were described from a brackish-water lake, Lake Nakaumi, Shimane Prefecture, Japan. This taxon is small in size with a single plastid, and has weakly silicified valves. The cell body is almost cylindrical in shape; 4.5–12 µm long in pervalvar axis and 2.0–4.0 µm in diameter. The valves of the frustule are similar, asymmetrically conical in shape with tops located axisymmetrically or asymmetrically to the pervalvar axis. A single long seta (0.5–50 µm) arises from the top of the valve face margin, and runs almost parallel (weakly bent) to the pervalvar axis. Ellipsoidal resting spores were observed, which are 3.5–7.5 µm long in pervalvar axis and 2.2–3.0 µm in diameter. Two types of cell sizes of Chaetoceros minimus are distinguishable (large and small),which suggests a relationship between cell size and water quality (salinity and/or water temperature). In this study, cells from Lake Nakaumi belong to the small type. Moreover, thin and thick cell-walled types are recognized from Lake Nakaumi. It is presumed that this dimorphism in shape corresponds to water temperature and/or cell cycle (vegetative or resting cell).

Journal

• Diatom

  Diatom 30 (0), 179-189, 2014

  The Japanese Society of Diatomology

Keywords

• brackish water
• <i>Chaetoceros minimus</i>
• diatom
• dimorphism
• Lake Nakaumi
• resting spore

Details

• CRID: 1390001205503510016
• NII Article ID: 130005001845
• NII Book ID: AA11130739
• DOI: 10.11464/diatom.30.179
• ISSN: 21868565
• ISSN: 09119310
• NDL BIB ID: 026013120
• Web Site: http://id.ndl.go.jp/bib/026013120
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I026013120
• Text Lang: ja
• Data Source:
  • JaLC
  • NDL
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed