Is vertical migration in Antarctic krill (Euphausia superba ) influenced by an underlying circadian rhythm?
Rent the article at a discountRent now
* Final gross prices may vary according to local VAT.Get Access
Antarctic krill (Euphausia superba) is a keystone species in the southern ocean ecosystem where it is the main consumer of phytoplankton and constitutes the main food item of many higher predators. Both food and predators are most abundant at the surface, thus krill hide in the depth of the ocean during the day and migrate to the upper layers at night, to feed at a time when the predatory risk is lowest. Although the functional significance of this diel vertical migration (DVM) is clear and its modulation by environmental factors has been described, the involvement of an endogenous circadian clock in this behaviour is as yet not fully resolved. We have analysed the circadian behaviour of Euphausia superba in a laboratory setting and here we present the first description of locomotor activity rhythms for this species. Our results are in agreement with the hypothesis that the circadian clock plays a key role in DVM. They also suggest that the interplay between food availability, social cues and the light:dark cycle acts as the predominant Zeitgeber for DVM in this species.
- Is vertical migration in Antarctic krill (Euphausia superba) influenced by an underlying circadian rhythm?
Journal of Genetics
Volume 87, Issue 5 , pp 473-483
- Cover Date
- Print ISSN
- Online ISSN
- Additional Links
- Antarctic krill
- vertical migration
- circadian rhythm
- Industry Sectors
- Author Affiliations
- 1. Department of Biology, University of Leicester, Leicester, LE1 7RH, UK
- 3. British Antarctic Survey, High Cross, Madingley Rd, Cambridge, CB3 0ET, UK
- 4. School of Biology and Ecology, University of Maine, Orono, ME, 04469, USA
- 2. Department of Genetics, University of Leicester, Leicester, LE1 7RH, UK