scholarly journals Calanus hyperboreus and the lipid pump

2017 ◽  
Vol 62 (3) ◽  
pp. 1155-1165 ◽  
Author(s):  
Andre W. Visser ◽  
Josephine Grønning ◽  
Sigrún Huld Jónasdóttir
Keyword(s):  
Calanus Hyperboreus

Reproduction of the Arctic copepod Calanus hyperboreus in the Greenland Sea-field and laboratory observations

Polar Biology ◽  
1996 ◽  
Vol 16 (3) ◽  
pp. 209-219 ◽  
Author(s):  
Hans-Jürgen Hirche ◽  
Barbara Niehoff
Keyword(s):  
The Arctic ◽  
Greenland Sea ◽  
Calanus Hyperboreus

scholarly journals Seasonal changes in nauplii and adults of Calanus hyperboreus (Copepoda) captured in sediment traps, Amundsen Gulf, Canadian Arctic

Polar Science ◽  
2008 ◽  
Vol 2 (3) ◽  
pp. 215-222 ◽  
Author(s):  
Y. Ota ◽  
H. Hattori ◽  
R. Makabe ◽  
M. Sampei ◽  
A. Tanimura ◽  
...  
Keyword(s):  
Seasonal Changes ◽  
Canadian Arctic ◽  
Sediment Traps ◽  
Calanus Hyperboreus ◽  
Amundsen Gulf

scholarly journals The intriguing co-distribution of the copepods Calanus hyperboreus and Calanus glacialis in the subsurface chlorophyll maximum of Arctic seas

Elem Sci Anth ◽  
2019 ◽  
Vol 7 ◽  
Author(s):  
Moritz S. Schmid ◽  
Louis Fortier
Keyword(s):  
Vertical Distribution ◽  
Fine Scale ◽  
Underwater Imaging ◽  
Arctic Seas ◽  
Climate Change Effects ◽  
The Core ◽  
Chlorophyll Maximum ◽  
The North ◽  
Subsurface Chlorophyll Maximum ◽  
Calanus Hyperboreus

Studying the distribution of zooplankton in relation to their prey and predators is challenging, especially in situ. Recent developments in underwater imaging enable such fine-scale research. We deployed the Lightframe On-sight Keyspecies Investigation (LOKI) image profiler to study the fine-scale (1 m) vertical distribution of the copepods Calanus hyperboreus and C. glacialis in relation to the subsurface chlorophyll maximum (SCM) at the end of the grazing season in August in the North Water and Nares Strait (Canadian Arctic). The vertical distribution of both species was generally consistent with the predictions of the Predator Avoidance Hypothesis. In the absence of a significant SCM, both copepods remained at depth during the night. In the presence of a significant SCM, copepods remained at depth in daytime and a fraction of the population migrated in the SCM at night. All three profiles where the numerically dominant copepodite stages C4 and C5 of the two species grazed in the SCM at night presented the same intriguing pattern: the abundance of C. hyperboreus peaked in the core of the SCM while that of C. glacialis peaked just above and below the core SCM. These distributions of the same-stage congeners in the SCMs were significantly different. Lipid fullness of copepod individuals was significantly higher in C. hyperboreus in the core SCM than in C. glacialis above and below the core SCM. Foraging interference resulting in the exclusion from the core SCM of the smaller C. glacialis by the larger C. hyperboreus could explain this vertical partitioning of the actively grazing copepodite stages of the two species. Alternatively, specific preferences for microalgal and/or microzooplankton food hypothetically occupying different layers in the SCM could explain the observed partitioning. Investigating the observed fine-scale co-distributions further will enable researchers to better predict potential climate change effects on these important Arctic congeners.

scholarly journals Contrasting assemblages of seabirds in the subglacial meltwater plume and oceanic water of Bowdoin Fjord, northwestern Greenland

2019 ◽  
Vol 77 (2) ◽  
pp. 711-720 ◽  
Author(s):  
Bungo Nishizawa ◽  
Naoya Kanna ◽  
Yoshiyuki Abe ◽  
Yoshihiko Ohashi ◽  
Daiki Sakakibara ◽  
...  
Keyword(s):  
Atlantic Water ◽  
Uria Lomvia ◽  
Little Auk ◽  
Near Surface ◽  
Tidewater Glaciers ◽  
Rissa Tridactyla ◽  
Cepphus Grylle ◽  
Black Guillemot ◽  
Calanus Hyperboreus ◽  
Subglacial Meltwater

Abstract In Greenland, tidewater glaciers discharge turbid subglacial freshwater into fjords, forming plumes near the calving fronts, and these areas serve as an important foraging habitat for seabirds. To investigate the effect of subglacial discharge on the foraging assemblages of surface feeders and divers in a glacial fjord, we conducted boat-based seabird surveys, near-surface zooplankton samplings, and hydrographic measurements at Bowdoin Fjord, northwestern Greenland in July. Foraging surface feeders (black-legged kittiwake Rissa tridactyla, glaucous gull Larus hyperboreus, and northern fulmar Fulmarus glacialis) aggregated within a plume-affected area in front of Bowdoin Glacier. This area was characterized by highly turbid subglacial meltwater and abundant large-sized zooplankton including Calanus hyperboreus, chaetognaths, and ctenophores near the surface. Surface feeders fed on these aggregated prey presumably transported to the surface by strong upwelling of subglacial meltwater. In contrast, divers (little auk Alle alle, thick-billed murre Uria lomvia, and black guillemot Cepphus grylle) foraged outside the fjord, where turbidity was low and jellyfish and Calanus copepods dominated under the influence of Atlantic water. Our study indicates spatial segregation between surface feeders and divers in a glacial fjord; surface feeders are not hindered by turbidity if taking prey at the surface, whereas divers need clear water.

scholarly journals Early development of Calanus hyperboreus nauplii: Response to a changing ocean

2013 ◽  
Vol 58 (6) ◽  
pp. 2109-2121 ◽  
Author(s):  
Signe Jung-Madsen ◽  
Torkel Gissel Nielsen ◽  
Peter Grønkjaer ◽  
Benni Winding Hansen ◽  
Eva Friis Møller
Keyword(s):  
Early Development ◽  
Calanus Hyperboreus
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