scholarly journals Biological processes in the North Sea: vertical distribution and reproduction of neritic copepods in relation to environmental factors

2010 ◽  
Vol 33 (1) ◽  
pp. 63-84 ◽  
Author(s):  
M. Koski ◽  
S. H. Jonasdottir ◽  
E. Bagoien
Keyword(s):  
Environmental Factors ◽  
Vertical Distribution ◽  
North Sea ◽  
Biological Processes ◽  
The North ◽  
The North Sea

Otolith increments in European plaice (Pleuronectes platessa) reveal temperature and density-dependent effects on growth

2018 ◽  
Vol 75 (5) ◽  
pp. 1655-1663 ◽  
Author(s):  
Peter van der Sleen ◽  
Christoph Stransky ◽  
John R Morrongiello ◽  
Holger Haslob ◽  
Melita Peharda ◽  
...  
Keyword(s):  
Environmental Factors ◽  
North Sea ◽  
Bottom Temperature ◽  
Growth Data ◽  
Mixed Effect ◽  
Pleuronectes Platessa ◽  
Growing Season Length ◽  
The North ◽  
Growth Variation ◽  
The North Sea

Abstract European plaice (Pleuronectes platessa) is a commercially important flatfish species in the North Sea. Yet, the environmental factors that affect the growth of plaice remain unresolved. Here we examine the drivers of plaice growth variation by using a large archive of otoliths from female plaice collected in the northeastern part of the North Sea from 1993 to 2015, providing growth data over the period 1985–2014. We developed a series of increasingly complex mixed-effect models to explore intrinsic (within individual) and extrinsic (environmental factors: bottom temperature and plaice density) sources of growth variation. We analysed juvenile (0 and 1 year) and (sub)adult (≥2 years) growth separately due to different habitat utilization across life stages. Juvenile growth was positively correlated with bottom temperature, whereas growth of adults was negatively correlated with bottom temperature. Correlations for both were strongest during autumn (September to October). For juveniles, the temperature–growth relationship likely reflects a response to growing season length while for adults it could reflect temperature-dependent changes to metabolic rate or food availability. For both juveniles and adults, we also found inverse relationship between population density and growth. We suggest that the approach used in this study can find a much wider application in European waters.

scholarly journals Vertical distribution of pre-settled sandeel (Ammodytes marinus) in the North Sea in relation to size and environmental variables

2003 ◽  
Vol 60 (6) ◽  
pp. 1342-1351 ◽  
Author(s):  
Henrik Jensen ◽  
Peter J Wright ◽  
Peter Munk
Keyword(s):  
Vertical Distribution ◽  
Water Column ◽  
North Sea ◽  
Distribution Patterns ◽  
Food Concentration ◽  
The North ◽  
Vertical Distributions ◽  
The North Sea ◽  
Drift Trajectory ◽  
Vertical Positioning

Abstract Vertical distribution patterns of larval and juvenile sandeels were investigated at four locations in the North Sea. Sandeels between 6 and 65 mm were found to depths of 80 m, with vertical distributions dependent on both length and environmental factors. At one location with a stratified water column, the highest densities were found during the day in midwater where food concentration was also highest. In areas without marked vertical hydrographic gradients, larvae were relatively more abundant in surface waters during the day. At all locations, larvae of all sizes were generally more homogeneously distributed in the water column during night than during day. The extent of vertical migration, as measured by the standard deviation of the mean depth, increased generally with length. Gear avoidance was evident for larvae ≥20 mm. Catch efficiency generally depended on both length class and surface light intensity. A simulated drift pattern of larvae, based on ADCP current measurements from two locations, predicts that the horizontal drift trajectory would only be affected slightly by the vertical positioning of the larvae in the water column during the time of sampling. The implication of vertical migrations for dispersal of larvae away from the spawning grounds is discussed.

INFLUENCE OF PATHOGENS, FISH-RELATED CHARACTERISTICS, AND ENVIRONMENTAL FACTORS ON THE DEVELOPMENT OF SKIN ULCERATIONS IN WILD COMMON DAB (LIMANDA LIMANDA) FROM THE NORTH SEA

2021 ◽  
Vol 57 (2) ◽  
Author(s):  
Maaike Vercauteren ◽  
Gert Van Hoey ◽  
Annemie Decostere ◽  
Filip Boyen ◽  
Bart Ampe ◽  
...  
Keyword(s):  
Environmental Factors ◽  
North Sea ◽  
The North ◽  
The North Sea ◽  
Skin Ulcerations

scholarly journals Horizontal and vertical distribution of meiofauna on sandy beaches of the North Sea (The Netherlands, Belgium, France)

2005 ◽  
Vol 59 (4) ◽  
pp. 255-264 ◽  
Author(s):  
Lech Kotwicki ◽  
Marleen De Troch ◽  
Barbara Urban-Malinga ◽  
Tom Gheskiere ◽  
Jan Marcin Węslawski
Keyword(s):  
The Netherlands ◽  
Vertical Distribution ◽  
North Sea ◽  
Sandy Beaches ◽  
The North ◽  
The North Sea ◽  
Horizontal And Vertical Distribution

Observations of copepod feeding and vertical distribution under natural turbulent conditions in the North Sea

2001 ◽  
Vol 138 (5) ◽  
pp. 1011-1019 ◽  
Author(s):  
A. W. Visser ◽  
H. Saito ◽  
E. Saiz ◽  
T. Kiørboe
Keyword(s):  
Vertical Distribution ◽  
North Sea ◽  
The North ◽  
The North Sea
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