Original Paper

Polar Biology

, Volume 31, Issue 12, pp 1509-1520

First online:

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

  • Kenji KonishiAffiliated withInstitute of Cetacean Research Email author 
  • , Tsutomu TamuraAffiliated withInstitute of Cetacean Research
  • , Ryoko ZenitaniAffiliated withInstitute of Cetacean Research
  • , Takeharu BandoAffiliated withInstitute of Cetacean Research
  • , Hidehiro KatoAffiliated withTokyo University of Marine Science and Technology
  • , Lars WalløeAffiliated withDepartment of Physiology, Institute of Basic Medical Sciences, University of Oslo

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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.


Antarctica Minke whale Balaenoptera bonaerensis Long-term change Euphausia superba Prey availability