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Ichthyological Research

, Volume 53, Issue 4, pp 419–422 | Cite as

Feeding ecology of two planktonic sculpins, Comephorus baicalensis and Comephorus dybowskii (Comephoridae), in Lake Baikal

  • Hitoshi Miyasaka
  • Yelena V. Dzyuba
  • Motomi Genkai-Kato
  • Sayaka Ito
  • Ayato Kohzu
  • Pavel N. Anoshko
  • Igor V. Khanayev
  • Sergey G. Shubenkov
  • Natalia G. Melnik
  • Oleg A. Timoshkin
  • Eitaro Wada
Short Report

Abstract

Planktonic sculpins (Comephorus baicalensis and Comephorus dybowskii) are endemic to Lake Baikal, and their migration behavior is characterized by their strange movements, which occur only vertically. We investigated their detailed food sources at each growth stage by stable isotope analyses in combination with stomach content analysis. At all growth stages, both fishes and amphipods were the main diet for C. baicalensis, whereas amphipods alone were the main diet for C. dybowskii. Our results indicate that the relationship between the two species shifts from a competitive interaction to a predator–prey interaction with the growth stages of C. baicalensis.

Key words

Lake Baikal Planktonic sculpin Stable isotope Comephorus Diet 

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Copyright information

© The Ichthyological Society of Japan 2006

Authors and Affiliations

  • Hitoshi Miyasaka
    • 1
  • Yelena V. Dzyuba
    • 2
  • Motomi Genkai-Kato
    • 1
  • Sayaka Ito
    • 1
  • Ayato Kohzu
    • 3
  • Pavel N. Anoshko
    • 2
  • Igor V. Khanayev
    • 2
  • Sergey G. Shubenkov
    • 2
  • Natalia G. Melnik
    • 2
  • Oleg A. Timoshkin
    • 2
  • Eitaro Wada
    • 4
  1. 1.Center for Marine Environmental StudiesEhime University, MatsuyamaEhimeJapan
  2. 2.Limnological Institute, Siberian DivisionRussian Academy of SciencesIrkutskRussia
  3. 3.Center for Ecological ResearchKyoto UniversityOtsuJapan
  4. 4.Frontier Research Center for Global ChangeYokohamaJapan

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