scholarly journals Diel vertical migration of the krill Meganyctiphanes norvegica in relation to physical environment, food and predators

1998 ◽  
Vol 171 ◽  
pp. 209-219 ◽  
Author(s):  
MSR Onsrud ◽  
S Kaartvedt
Keyword(s):  
Vertical Migration ◽  
Physical Environment ◽  
Diel Vertical Migration ◽  
Meganyctiphanes Norvegica

An optimisation model of the diel vertical migration of northern krill (Meganyctiphanes norvegica) in the Clyde Sea and the Kattegat

2000 ◽  
Vol 57 (S3) ◽  
pp. 38-50 ◽  
Author(s):  
Geraint Tarling ◽  
Michael Burrows ◽  
Jack Matthews ◽  
Reinhard Saborowski ◽  
Friedrich Buchholz ◽  
...  
Keyword(s):  
Predation Risk ◽  
Vertical Migration ◽  
Environmental Conditions ◽  
Diel Vertical Migration ◽  
Energy Gain ◽  
Minor Effect ◽  
Risk Of Predation ◽  
Meganyctiphanes Norvegica ◽  
Optimisation Model ◽  
Clyde Sea

An optimisation model was developed to examine the effect of predation risk and environmental conditions on the diel vertical migration (DVM) of adult northern krill (Meganyctiphanes norvegica). Model predictions were compared in two locations with contrasting environmental conditions, the Clyde Sea and the Kattegat. The model was constructed from a combination of parameterised functions and empirical field data obtained during summer conditions. Parameter matrices were set up to cover the entire water column over a 24-h period. The first matrix contained values for "net energy gain," which incorporated empirical data on temperature-dependent respiration, copepod and phytoplankton abundance, and a functional response model for feeding rate. The second matrix expressed the risk of encountering a generalised visual (fish) predator as a function of light levels. The optimisation procedure sought a path through depth and time such that the energy gain was equal to the amount necessary to grow, produce eggs, and moult, while the risk of predation was minimised. The model predicted DVM in both the Clyde Sea and the Kattegat. Sensitivity analyses showed that the predicted DVM pattern was mainly driven by food and predation risk, with temperature effects on metabolic costs having a minor effect.

Northern krill, Meganyctiphanes norvegica, come up to see the last eclipse of the millennium?

2002 ◽  
Vol 82 (5) ◽  
pp. 919-920 ◽  
Author(s):  
J.-O. Strömberg ◽  
J.I. Spicer ◽  
B. Liljebladh ◽  
M.A. Thomasson
Keyword(s):  
Light Intensity ◽  
Solar Eclipse ◽  
Vertical Migration ◽  
Diel Vertical Migration ◽  
Triggering Mechanism ◽  
Downward Movement ◽  
Meganyctiphanes Norvegica

Most krill species undergo diel vertical migration (DVM) which is to some extent influenced by light intensity. During a solar eclipse (11 August 1999) the upward and downward movement of krill, Meganyctiphanes norvegica, inhabiting a Swedish fjord followed closely changes in light intensity. Here the eclipse was partial (77%) and the weather overcast and yet krill at 70–90 m depth were able to detect, and respond to very small changes in light. This observation of an event during mid-day which is not pre-programmed confirms light as an important triggering mechanism for krill DVM.

Diel vertical migration of mesozooplankton in the northern Yellow Sea

2021 ◽  
Author(s):  
Ruping Ge ◽  
Hongju Chen ◽  
Guangxing Liu ◽  
Yanzhong Zhu ◽  
Qiang Jiang
Keyword(s):  
Vertical Migration ◽  
Yellow Sea ◽  
Diel Vertical Migration ◽  
Northern Yellow Sea

scholarly journals DIEL VERTICAL MIGRATION OF Gonyostomum semen (Raphidophyceae) IN KAWAHARA LAKE

2002 ◽  
Vol 46 ◽  
pp. 1061-1066 ◽  
Author(s):  
Youichi TAKEMOTO ◽  
Katsuhiro FURUMOTO ◽  
Akihide TADA
Keyword(s):  
Vertical Migration ◽  
Diel Vertical Migration ◽  
Gonyostomum Semen

Zooplankton diel vertical migration and influence of upwelling on the biomass in the Chukchi Sea during summer

2015 ◽  
Vol 34 (5) ◽  
pp. 68-74 ◽  
Author(s):  
Huiwu Wang ◽  
Hongxia Chen ◽  
Liang Xue ◽  
Na Liu ◽  
Yanliang Liu
Keyword(s):  
Vertical Migration ◽  
Diel Vertical Migration ◽  
Chukchi Sea
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