scholarly journals From polar night to midnight sun: Diel vertical migration, metabolism and biogeochemical role of zooplankton in a high Arctic fjord (Kongsfjorden, Svalbard)

2017 ◽  
Vol 62 (4) ◽  
pp. 1586-1605 ◽  
Author(s):  
G. Darnis ◽  
L. Hobbs ◽  
M. Geoffroy ◽  
J. C. Grenvald ◽  
P. E. Renaud ◽  
...  
Keyword(s):  
Vertical Migration ◽  
Diel Vertical Migration ◽  
High Arctic ◽  
Polar Night ◽  
Arctic Fjord

scholarly journals Modeling studies of the bioluminescence potential dynamics in a high Arctic fjord during polar night

2021 ◽  
Author(s):  
Igor Shulman ◽  
Jonathan H. Cohen ◽  
Mark A. Moline ◽  
Stephanie Anderson ◽  
E. Joseph Metzger ◽  
...  
Keyword(s):  
High Arctic ◽  
Shelf Break ◽  
Polar Night ◽  
Modeling Approach ◽  
Modeling Studies ◽  
Shelf Slope ◽  
Arctic Fjord

AbstractDuring polar nights in January 2012 and 2017, significantly higher bioluminescence (BL) potential emissions in the upper 50 m were observed in the fjord Rijpfjorden (Svalbard, Norway) in comparison to offshore stations (located on the shelf-break, shelf-slope areas and in the deeper water). The objective of this paper is to better understand why, during two polar nights (separated by 5 years), the values of BL potential in the northern Svalbard fjord are higher than at offshore stations, and what the role of advection is in observed elevated BL potential values in the top 50 m of the fjord. To address the above objective, we applied the same BL potential modeling approach and strategies during polar nights for both 2012 and 2017. For both years, advection of BL potential from offshore (including upwelling along the shelf, shelf-slope) produced an increase of BL potential in the fjord area, in spite of the introduction of mortality in bioluminescent organisms. Observations of BL potential indicated high emissions at depths below 100 m at offshore stations for both polar nights. Our modeling studies demonstrated that these high values of BL potential below 100 m are upwelled and advected to the top 50 m of the fjord. We demonstrated that upwelling and advection of these deep high BL potential values (and therefore, upwelling and advection of corresponding bioluminescent taxa) from offshore areas are dominant factors in observed BL potential dynamics in the top 50 m in the fjord.

scholarly journals Unsynchronised and synchronised vertical migration of zooplankton in a high Arctic fjord

2006 ◽  
Vol 51 (6) ◽  
pp. 2586-2599 ◽  
Author(s):  
Finlo R. Cottier ◽  
Geraint A. Tarling ◽  
Anette Wold ◽  
Stig Falk-Petersen
Keyword(s):  
Vertical Migration ◽  
High Arctic ◽  
Arctic Fjord

scholarly journals Diel vertical migration of copepods in mountain lakes: The changing role of ultraviolet radiation across a transparency gradient

2014 ◽  
Vol 60 (1) ◽  
pp. 252-262 ◽  
Author(s):  
Janet M. Fischer ◽  
Mark H. Olson ◽  
Nora Theodore ◽  
Craig E. Williamson ◽  
Kevin C. Rose ◽  
...  
Keyword(s):  
Ultraviolet Radiation ◽  
Vertical Migration ◽  
Diel Vertical Migration ◽  
Mountain Lakes ◽  
Changing Role

scholarly journals The role of ultraviolet radiation in the diel vertical migration of zooplankton: an experimental test of the transparency-regulator hypothesis

2015 ◽  
Vol 37 (5) ◽  
pp. 886-896 ◽  
Author(s):  
Taylor H. Leach ◽  
Craig E. Williamson ◽  
Nora Theodore ◽  
Janet M. Fischer ◽  
Mark H. Olson
Keyword(s):  
Ultraviolet Radiation ◽  
Experimental Test ◽  
Vertical Migration ◽  
Diel Vertical Migration

scholarly journals Pan-Arctic diel vertical migration during the polar night

2018 ◽  
Vol 605 ◽  
pp. 61-72 ◽  
Author(s):  
L Hobbs ◽  
FR Cottier ◽  
KS Last ◽  
J Berge
Keyword(s):  
Vertical Migration ◽  
Diel Vertical Migration ◽  
Polar Night

scholarly journals 5α-cyprinol sulfate, a bile salt from fish, induces diel vertical migration in Daphnia

eLife ◽  
2019 ◽  
Vol 8 ◽  
Author(s):  
Meike Anika Hahn ◽  
Christoph Effertz ◽  
Laurent Bigler ◽  
Eric von Elert
Keyword(s):  
Vertical Migration ◽  
Diel Vertical Migration ◽  
Predator Avoidance ◽  
Aquatic Invertebrates ◽  
Chemical Cues ◽  
Temporal Distribution ◽  
Aquatic Environments ◽  
Inducible Defenses ◽  
Lipid Digestion

Prey are under selection to minimize predation losses. In aquatic environments, many prey use chemical cues released by predators, which initiate predator avoidance. A prominent example of behavioral predator-avoidance constitutes diel vertical migration (DVM) in the freshwater microcrustacean Daphnia spp., which is induced by chemical cues (kairomones) released by planktivorous fish. In a bioassay-guided approach using liquid chromatography and mass spectrometry, we identified the kairomone from fish incubation water as 5α-cyprinol sulfate inducing DVM in Daphnia at picomolar concentrations. The role of 5α-cyprinol sulfate in lipid digestion in fish explains why from an evolutionary perspective fish has not stopped releasing 5α-cyprinol sulfate despite the disadvantages for the releaser. The identification of the DVM-inducing kairomone enables investigating its spatial and temporal distribution and the underlying molecular mechanism of its perception. Furthermore, it allows to test if fish-mediated inducible defenses in other aquatic invertebrates are triggered by the same compound.

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