, Volume 463, Issue 1–3, pp 83–92 | Cite as

Oligochaetes in Lake Towada, Japan, an oligotrophic caldera

  • Akifumi Ohtaka


Twenty-nine oligochaete taxa were recorded from the oligotrophic caldera Lake Towada, northern Japan. All the taxa were found at littoral bottoms shallower than 20 m, and 79% (23 taxa) occurred there exclusively. The profundal bottoms deeper than 40 m were inhabited by three tubificids (Rhyacodrilus komarovi, Tubifex tubifex and Tubificidae gen. sp.) and one lumbriculid (Lumbriculus variegatus). Among them, R. komarovi and Tubificidae gen. sp. were restricted to the profundal zone during the summer stratified season, while they were found at littoral bottoms in winter, suggesting that their bathymetric distributions are regulated by water temperature regime and change seasonally. R. komarovi, a primarily riverine tubificid, which was previously known only from Primor'e (Russia) and it is fully described and illustrated in this article, dominated at the profundal bottoms. The cool, oxygen-rich environment at the profundal bottoms of the lake allowed colonization by stenotherm and oxyphilic species. Descriptions and taxonomic remarks are provided for two naidids new to Japan, Amphichaeta leydigii and Pristinella amphibiotica, based on L. Towada material.

Oligochaeta Caldera Lake Towada Japan Rhyacodrilus komarovi depth distribution new distribution records 


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Copyright information

© Kluwer Academic Publishers 2001

Authors and Affiliations

  • Akifumi Ohtaka
    • 1
  1. 1.Department of Natural Science, Faculty of EducationHirosaki UniversityHirosakiJapan

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