scholarly journals Seasonal dynamics of phytoplankton and Calanus finmarchicus in the North Sea as revealed by a coupled one-dimensional model

1996 ◽  
Vol 41 (3) ◽  
pp. 522-539 ◽  
Author(s):  
François Carlotti ◽  
Günther Radach
Keyword(s):  
North Sea ◽  
Seasonal Dynamics ◽  
Calanus Finmarchicus ◽  
Dimensional Model ◽  
One Dimensional ◽  
The North ◽  
The North Sea

Studies on a Calanus Patch III. The quantity of food eaten by Calanus finmarchicus

1963 ◽  
Vol 43 (2) ◽  
pp. 349-371 ◽  
Author(s):  
D. H. Cushing ◽  
T. Vucetic
Keyword(s):  
Water Temperature ◽  
North Sea ◽  
Calanus Finmarchicus ◽  
Algal Production ◽  
The North ◽  
The North Sea ◽  
Grazing Mortality ◽  
And Diffusion ◽  
Grazing Capacity ◽  
Food Consumed

The purpose of this paper is to assess the grazing capacity of Calanus finmar-chicus (Gunner.) in terms of the quantity of food eaten in the sea. The part played in the growth of the animal by the quantity eaten will only be briefly discussed. The parts played by nutrient lack, sinking and diffusion on the algal productive rates will also be discussed, leading to the conclusion that grazing mortality is the most effective controlling agent on algal production.A subsidiary purpose of this paper is to relate changes in the weight of Calanus finmarchicus to changes in food consumed and to changes in water temperature. Measurements of C. finmarchicus have been made by a number of workers (Adler & Jespersen, 1920; Russell, 1928; Marshall, 1933; Stormer, 1929; Bogorov, 1934; Jespersen, 1939; Clarke & Zinn, 1937). It will be shown that in the North Sea, in spring, the greatest changes in weight are most readily related to changes in quantities of food consumed.

Composition and origin of milky water in the North Sea

1980 ◽  
Vol 60 (3) ◽  
pp. 759-768 ◽  
Author(s):  
J. K. Volkman ◽  
R. R. Gatten ◽  
J. R. Sargent
Keyword(s):  
North Sea ◽  
Mass Spectra ◽  
Oxidative Degradation ◽  
Wax Esters ◽  
Calanus Finmarchicus ◽  
Wax Ester ◽  
Capillary Gc ◽  
The North ◽  
The North Sea ◽  
Calanus Species

An occurrence of ‘milky water’ which covered a wide area of the North Sea in June 1975 is described. The water contained 20 mg/1 of an oil which was shown by capillary GC-MS to consist mainly (> 80%) of two wax esters 34:1 and 36:1. Analysis of the acids and alcohols released by hydrolysis, and interpretation of the wax ester mass spectra, indicated that the 34:1 ester was almost entirely composed of the alcohol-acid combination 20:1–14:0 and the 36:1 ester was composed of 22:1–14:0 (75%) and 20:1–16:0 (19%). Wax esters of virtually the same composition predominate in the lipids of the copepod Calanus finmarchicus which has the implication that the ‘milky water’ was caused by ageing of the oil released following a mass mortality of copepods. The lack of polyunsaturated wax esters and of astaxanthin is ascribed to oxidative degradation of these labile lipids following release into the sea. A copepod origin for the milky water is further supported by its containing small amounts of cholesterol and pristane, both of which are common to Calanus species.

scholarly journals Does copepod size determine food consumption of particulate feeding fish?

2013 ◽  
Vol 71 (1) ◽  
pp. 35-43 ◽  
Author(s):  
Mikael van Deurs ◽  
Marja Koski ◽  
Anna Rindorf
Keyword(s):  
Food Consumption ◽  
North Sea ◽  
Fish Larvae ◽  
Handling Time ◽  
Growth Conditions ◽  
Calanus Finmarchicus ◽  
Fish Feeding ◽  
The North ◽  
The North Sea ◽  
Particulate Feeding

Abstract van Deurs, M., Koski, M., and Rindorf, A. Does copepod size determine food consumption of particulate feeding fish? – ICES Journal of Marine Science, 71: . The climate-induced reduction in the mean copepod size, mainly driven by a decrease in the abundance of the large Calanus finmarchicus around 1987, has been linked to the low survival of fish larvae in the North Sea. However, to what extent this sort of reduction in copepod size has any influence on adult particulate feeding fish is unknown. In the present study, we investigated the hypothesis that the availability of the large copepods determines food consumption and growth conditions of lesser sandeel (Ammodytes marinus) in the North Sea. Analysis of stomach content suggested that food consumption is higher for fish feeding on large copepods, and additional calculations revealed how handling time limitation may provide part of the explanation for this relationship. Comparing stomach data and zooplankton samples indicated that lesser sandeel actively target large copepods when these are available. Finally, we observed that the length of lesser sandeel began to decrease in the late 1980s, simultaneously with the C. finmarchicus decline.

Seasonal Dynamics and Modeling of a Vibrio Community in Coastal Waters of the North Sea

2011 ◽  
Vol 63 (3) ◽  
pp. 543-551 ◽  
Author(s):  
Sonja Oberbeckmann ◽  
Bernhard M. Fuchs ◽  
Mirja Meiners ◽  
Antje Wichels ◽  
Karen H. Wiltshire ◽  
...  
Keyword(s):  
North Sea ◽  
Coastal Waters ◽  
Seasonal Dynamics ◽  
The North ◽  
The North Sea

A model of the spring migration into the North Sea by Calanus finmarchicus overwintering off the Scottish continental shelf

1999 ◽  
Vol 8 ◽  
pp. 107-125 ◽  
Author(s):  
A. Gallego ◽  
J. Mardaljevic ◽  
M.R. Heath ◽  
D. Hainbucher ◽  
D. Slagstad
Keyword(s):  
Continental Shelf ◽  
North Sea ◽  
Spring Migration ◽  
Calanus Finmarchicus ◽  
The North ◽  
The North Sea

scholarly journals Overwintering distribution, inflow patterns and sustainability of Calanus finmarchicus in the North Sea

2021 ◽  
pp. 102567
Author(s):  
Shuang Gao ◽  
Solfrid Sætre Hjøllo ◽  
Tone Falkenhaug ◽  
Espen Strand ◽  
Martin Edwards ◽  
...  
Keyword(s):  
North Sea ◽  
Calanus Finmarchicus ◽  
The North ◽  
The North Sea
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