scholarly journals Composition of Total and Cell-Proliferating Bacterioplankton Community in Early Summer in the North Sea – Roseobacters Are the Most Active Component

2017 ◽  
Vol 8 ◽  
Author(s):  
Insa Bakenhus ◽  
Leon Dlugosch ◽  
Sara Billerbeck ◽  
Helge-Ansgar Giebel ◽  
Felix Milke ◽  
...  
Keyword(s):  
North Sea ◽  
Active Component ◽  
Early Summer ◽  
Bacterioplankton Community ◽  
The North ◽  
The North Sea

On the Marina Cladocera from the Northumbrian Plankton

1933 ◽  
Vol 19 (1) ◽  
pp. 177-226 ◽  
Author(s):  
Olag M. Jorgensen
Keyword(s):  
North Sea ◽  
Body Shape ◽  
Early Summer ◽  
Brood Chamber ◽  
The North ◽  
Points Of Interest ◽  
The North Sea ◽  
Inshore Waters ◽  
The Baltic

From an analysis of previous records of E. nordmanni, considered in conjunction with those furnished by the present investigation, the following points of interest emerge.1. E. nordmanni, while being generally distributed in the North Sea and adjacent waters throughout the summer months, has been shown to breed freely in inshore waters in early summer and again in autumn when maximum numbers of individuals are obtained.2. These two periods of maximal abundance are produced as the result of successive parthenogenetic broods and alternate with periods of depression. This is indicated not only by the sexually-produced winter-egg, but also by a reduction in the number of embryos contained in the brood chamber and consequent change in body-shape. This serves to show that the supposedly distinct races, described as being characteristic of the North Sea and the Baltic, have no doubt been founded on material taken at different periods of the agamic phase.

scholarly journals Investigation on the trophic state of the North Sea for three years (1994–1996) simulated with the ecosystem model ERSEM – the role of a sharp NAOI decline

2004 ◽  
Vol 1 (1) ◽  
pp. 725-754 ◽  
Author(s):  
H. J. Lenhart ◽  
J. Pätsch ◽  
W. Kühn ◽  
A. Moll ◽  
T. Pohlmann
Keyword(s):  
North Sea ◽  
Net Primary Production ◽  
Ecosystem Model ◽  
Early Summer ◽  
The North ◽  
The North Sea ◽  
Strong Transition ◽  
Northern North Sea ◽  
Sea Area

Abstract. Applying the ecosystem model ERSEM to the Northwest-European shelf (48°–63°N, 15°W–12°E) the years 1994-1996 were simulated, which exhibit an extremely strong transition in North Atlantic Oscillation index (NAOI): from a high-NAOI to a low-NAOI regime. In order to be far enough from the boundaries of the model area the results and budgets are focussed on the North Sea area. For this region the model was validated against climatological values of nitrate as representative nutrient. For all three years the North Sea was found to be net heterotrophic: organic material was imported, inorganic material was exported. The strength of this "remineralisation-machine" was large during NAOI-high years (1994 and 1995). It was weaker in 1996 with a low NAOI. This was caused by higher net primary production in the northern North Sea during summer 1996. In this year the stratification was weaker and began later allowing the deep nutrient-rich water in the northern North Sea to be mixed into the upper layers also during early summer.

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