scholarly journals Diel vertical migration of Antarctic krill (Euphausia superba) is flexible during advection across the Scotia Sea

2009 ◽  
Vol 31 (10) ◽  
pp. 1265-1281 ◽  
Author(s):  
K. A. Cresswell ◽  
G. A. Tarling ◽  
S. E. Thorpe ◽  
M. T. Burrows ◽  
J. Wiedenmann ◽  
...  
Keyword(s):  
Vertical Migration ◽  
Diel Vertical Migration ◽  
Antarctic Krill ◽  
Euphausia Superba ◽  
Scotia Sea ◽  
Antarctic Krill Euphausia Superba

scholarly journals Spatial variability in total and organic mercury levels in Antarctic krill Euphausia superba across the Scotia Sea

2019 ◽  
Vol 247 ◽  
pp. 332-339 ◽  
Author(s):  
José Seco ◽  
José C. Xavier ◽  
João P. Coelho ◽  
Bárbara Pereira ◽  
Geraint Tarling ◽  
...  
Keyword(s):  
Spatial Variability ◽  
Antarctic Krill ◽  
Euphausia Superba ◽  
Organic Mercury ◽  
Scotia Sea ◽  
Antarctic Krill Euphausia Superba

scholarly journals Circadian regulation of diel vertical migration (DVM) and metabolism in Antarctic krill Euphausia superba

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Fabio Piccolin ◽  
Lisa Pitzschler ◽  
Alberto Biscontin ◽  
So Kawaguchi ◽  
Bettina Meyer
Keyword(s):  
Oxygen Consumption ◽  
High Latitude ◽  
Vertical Migration ◽  
Diel Vertical Migration ◽  
Clock Gene ◽  
Antarctic Krill ◽  
Euphausia Superba ◽  
Recent Analysis ◽  
Circadian Regulation ◽  
Free Running

Abstract Antarctic krill (Euphausia superba) are high latitude pelagic organisms which play a key ecological role in the ecosystem of the Southern Ocean. To synchronize their daily and seasonal life-traits with their highly rhythmic environment, krill rely on the implementation of rhythmic strategies which might be regulated by a circadian clock. A recent analysis of krill circadian transcriptome revealed that their clock might be characterized by an endogenous free-running period of about 12–15 h. Using krill exposed to simulated light/dark cycles (LD) and constant darkness (DD), we investigated the circadian regulation of krill diel vertical migration (DVM) and oxygen consumption, together with daily patterns of clock gene expression in brain and eyestalk tissue. In LD, we found clear 24 h rhythms of DVM and oxygen consumption, suggesting a synchronization with photoperiod. In DD, the DVM rhythm shifted to a 12 h period, while the peak of oxygen consumption displayed a temporal advance during the subjective light phase. This suggested that in free-running conditions the periodicity of these clock-regulated output functions might reflect the shortening of the endogenous period observed at the transcriptional level. Moreover, differences in the expression patterns of clock gene in brain and eyestalk, in LD and DD, suggested the presence in krill of a multiple oscillator system. Evidence of short periodicities in krill behavior and physiology further supports the hypothesis that a short endogenous period might represent a circadian adaption to cope with extreme seasonal photoperiodic variability at high latitude.

scholarly journals Is vertical migration in Antarctic krill (Euphausia superba) influenced by an underlying circadian rhythm?

2008 ◽  
Vol 87 (5) ◽  
pp. 473-483 ◽  
Author(s):  
Edward Gaten ◽  
Geraint Tarling ◽  
Harold Dowse ◽  
Charalambos Kyriacou ◽  
Ezio Rosato
Keyword(s):  
Circadian Rhythm ◽  
Vertical Migration ◽  
Antarctic Krill ◽  
Euphausia Superba ◽  
Antarctic Krill Euphausia Superba

Observation on behaviours of Antarctic krill (Euphausia superba) in lighting condition

2012 ◽  
Vol 36 (2) ◽  
pp. 300
Author(s):  
Peng-xiang XU ◽  
Ying-chun LI ◽  
Guo-ping ZHU ◽  
Hui XIA ◽  
Liu-xiong XU
Keyword(s):  
Antarctic Krill ◽  
Euphausia Superba ◽  
Lighting Condition ◽  
Antarctic Krill Euphausia Superba
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