Polar Biology

, Volume 31, Issue 12, pp 1509–1520

Decline in energy storage in the Antarctic minke whale (Balaenoptera bonaerensis) in the Southern Ocean


    • Institute of Cetacean Research
  • Tsutomu Tamura
    • Institute of Cetacean Research
  • Ryoko Zenitani
    • Institute of Cetacean Research
  • Takeharu Bando
    • Institute of Cetacean Research
  • Hidehiro Kato
    • Tokyo University of Marine Science and Technology
  • Lars Walløe
    • Department of Physiology, Institute of Basic Medical SciencesUniversity of Oslo
Original Paper

DOI: 10.1007/s00300-008-0491-3

Cite this article as:
Konishi, K., Tamura, T., Zenitani, R. et al. Polar Biol (2008) 31: 1509. doi:10.1007/s00300-008-0491-3


The annual trend in energy storage in the Antarctic minke whale was examined using catch data from all 18 survey years in the Japanese Whale Research Program (JARPA). Regression analyses clearly showed that blubber thickness, girth and fat weight have been decreasing for nearly 2 decades. The decrease per year is estimated at approximately 0.02 cm for mid-lateral blubber thickness and 17 kg for fat weight, corresponding to 9% for both measurements over the 18-year period. Furthermore, “date”, “extent of diatom adhesion”, “sex”, “body length”, “fetus length”, “latitude”, “age” and “longitude” were all identified as partially independent predictors of blubber thickness. The direct interpretation of this substantial decline in energy storage in terms of food availability is difficult, since no long-term krill abundance series is available. However, an increase in the abundance of krill feeders other than minke whales and a resulting decrease in the krill population must be considered as a likely explanation.


AntarcticaMinke whaleBalaenoptera bonaerensisLong-term changeEuphausia superbaPrey availability

Copyright information

© Springer-Verlag 2008