Polar Biology

, Volume 32, Issue 3, pp 503–507

Structural changes in the digestive glands of larval Antarctic krill (Euphausia superba) during starvation

  • Toshihiro Yoshida
  • So Kawaguchi
  • Bettina Meyer
  • Patti Virtue
  • Jennifer Penschow
  • Gerry Nash
Short Note

DOI: 10.1007/s00300-008-0569-y

Cite this article as:
Yoshida, T., Kawaguchi, S., Meyer, B. et al. Polar Biol (2009) 32: 503. doi:10.1007/s00300-008-0569-y

Abstract

The effects of starvation on ultrastructure of digestive gland cells were studied in furcilia larvae of Antarctic krill (Euphausia superba: hereafter krill). Under laboratory conditions, larvae were starved for 0, 5, 10, 15, 20 and 25 days, and their R-cells were investigated by transmission electron microscope. R-cells are thought to play a role in the storage and absorption of nutrients. In fed larvae, numerous mitochondria scattered homogenously, and densely packed microvilli were observed on the apical surface of R-cells. After 5 days of starvation, mitochondria were swollen and were found concentrated in the apical region in R-cells. A decrease in cell volume and an increase in thickness of the basal lamina with many irregular infoldings were observed after 10–15 days of starvation. Lipid droplets were rarely found in the R-cells regardless of whether larvae had been fed or starved suggesting an inability to store lipid. Without the ability to store energy in the form of lipid, survival would be dependant on sourcing continuous food until maturation.

Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  • Toshihiro Yoshida
    • 1
    • 2
    • 4
  • So Kawaguchi
    • 2
  • Bettina Meyer
    • 3
  • Patti Virtue
    • 1
  • Jennifer Penschow
    • 2
  • Gerry Nash
    • 2
  1. 1.Institute of Antarctic and Southern Ocean StudiesUniversity of TasmaniaHobartAustralia
  2. 2.Australian Government Antarctic DivisionKingstonAustralia
  3. 3.Scientific Division Biological OceanographyAlfred Wegener Institute for Polar and Marine ResearchBremerhavenGermany
  4. 4.ACE/CRC (Antarctic Climate and Ecosystem, Cooperate Research Centre)HobartAustralia