scholarly journals Characteristics of the Norwegian Coastal Current during Years with High Recruitment of Norwegian Spring Spawning Herring (Clupea harengus L.)

PLoS ONE ◽  
2015 ◽  
Vol 10 (12) ◽  
pp. e0144117 ◽  
Author(s):  
Øystein Skagseth ◽  
Aril Slotte ◽  
Erling Kåre Stenevik ◽  
Richard D. M. Nash
Keyword(s):  
Clupea Harengus ◽  
Coastal Current ◽  
Norwegian Coastal Current ◽  
High Recruitment

scholarly journals Modelling dispersal of eggs and quantifying connectivity among Norwegian coastal cod subpopulations

2013 ◽  
Vol 71 (4) ◽  
pp. 957-969 ◽  
Author(s):  
Mari S. Myksvoll ◽  
Kyung-Mi Jung ◽  
Jon Albretsen ◽  
Svein Sundby
Keyword(s):  
Ocean Model ◽  
Small Scale ◽  
Coastal Current ◽  
Life Stages ◽  
Early Life Stages ◽  
Dispersal Patterns ◽  
Norwegian Coast ◽  
Spawning Areas ◽  
Numerical Ocean Model ◽  
Norwegian Coastal Current

Abstract The Norwegian coast is populated by two cod populations: Northeast Arctic cod and Norwegian Coastal cod. In this paper, we use a further division based on life history: oceanic cod, coastal cod, and fjord cod. A numerical ocean model was implemented for the northern Norwegian coast where all these populations have spawning areas. The model results were used to simulate connectivity and retention of cod eggs from the different subpopulations. The model reproduced the observed variability and mesoscale activity in the Norwegian Coastal Current. Eggs released at an oceanic spawning area were transported northwards along the coastline. Coastal cod eggs had intermediate connectivity with each other and fjord cod eggs had high local retention. Although the high retention of eggs in fjord areas is mainly caused by a subsurface distribution of eggs, the intermediate retention of eggs from coastal spawning areas is caused by small-scale eddies in-between many small islands. The high-resolution ocean model made it possible to reveal these specific dispersal patterns. The high retention of early life stages in fjords combined with strong homing to spawning areas indicates that fjord subpopulations may be described as a metapopulation.

Whirls in the Norwegian Coastal Current

1983 ◽  
pp. 311-320 ◽  
Author(s):  
T. A. McClimans ◽  
J. H. Nilsen
Keyword(s):  
Coastal Current ◽  
Norwegian Coastal Current

The use of Cs and Sr isotopes as tracers in the Arctic Mediterranean Seas

1988 ◽  
Vol 325 (1583) ◽  
pp. 161-176 ◽  
Keyword(s):  
Deep Water ◽  
Thermohaline Circulation ◽  
Atlantic Water ◽  
The Arctic ◽  
Coastal Current ◽  
Intermediate Water ◽  
Sr Isotopes ◽  
Arctic Ice ◽  
Norwegian Coastal Current

The Arctic Mediterranean Seas constitute an oceanic region in which the thermohaline circulation has a strong advective component and deep ventilation processes are very active relative to other oceanic areas. Details of the nature of these circulation and ventilation processes have been revealed through use of Cs and Sr isotopes from bomb-fallout and nuclear-waste sources as ocean tracers. In both cases, their regional input is dominated by advective supply in the Norwegian Atlantic Current and Norwegian Coastal Current, respectively. The different temporal, spatial, and compositional input patterns of these tracers have been used to study different facets of the regional circulation. These input differences and some representative applications of the use of these tracers are reviewed. The data discussed derive from samples collected both from research vessels and from Arctic ice camps. The topics addressed include: ( a ) the role of Arctic Intermediate Water as source, supplying recent surface water to North Atlantic Deep Water via the Denmark Strait overflow; ( b ) deep convective mixing in the Greenland Sea; ( c ) circulation or recirculation of Atlantic water in the Arctic basins; and ( d ) the role of Arctic shelfwaters in the ventilation of intermediate and deep water in the Eurasian and Canadian basins.

scholarly journals Effect of hatching date, vertical distribution, and interannual variation in physical forcing on northward displacement and temperature conditions of Norwegian spring-spawning herring larvae

2010 ◽  
Vol 67 (9) ◽  
pp. 1948-1956 ◽  
Author(s):  
Frode B. Vikebø ◽  
Åse Husebø ◽  
Aril Slotte ◽  
Erling Kåre Stenevik ◽  
Vidar S. Lien
Keyword(s):  
Vertical Distribution ◽  
Ambient Temperature ◽  
Interannual Variation ◽  
Barents Sea ◽  
Clupea Harengus ◽  
Coastal Current ◽  
Hatching Date ◽  
Physical Forcing ◽  
Larval Drift ◽  
Temperature Conditions

Abstract Vikebø, F. B., Husebø, Å., Slotte, A., Stenevik, E. K., and Lien, V. S. 2010. Effect of hatching date, vertical distribution, and interannual variation in physical forcing on northward displacement and temperature conditions of Norwegian spring-spawning herring larvae. – ICES Journal of Marine Science, 67: 1948–1956. Early hatching has been shown to be associated with increased survival of Norwegian spring-spawning herring (Clupea harengus) larvae. We investigated whether the process behind this association is related to larval drift and ambient temperature. A three-dimensional hydrodynamic model was used to simulate the effect of hatching date on northward displacement and temperature conditions of larvae from spawning grounds off western Norway for 1989–2008. The simulations revealed that the displacement during a period of 60 d was greatest if the larvae hatched early in the season and if they were located near the surface. The relationship between drift speed and ambient temperature was significantly negative, but less so later in the season, because the coastal current became progressively warmer. Results from the simulated interannual variations in larval drift compared with the observed survival suggest that a rapid northward displacement to the main nursery area in the Barents Sea is more important for larval survival than ambient temperature. The significant effect of northward displacement on survival could be explained by reduced overlap with predators and/or higher prey densities, but the causal processes involved remain to be investigated.

scholarly journals Growth of juvenile Norwegian spring-spawning herring in relation to latitudinal and interannual differences in temperature and fish density in their coastal and fjord nursery areas

2007 ◽  
Vol 64 (6) ◽  
pp. 1161-1172 ◽  
Author(s):  
Åse Husebø ◽  
Aril Slotte ◽  
Erling Kåre Stenevik
Keyword(s):  
Barents Sea ◽  
Negative Relationship ◽  
Clupea Harengus ◽  
Fish Density ◽  
Coastal Current ◽  
Nursery Areas ◽  
Wide Range ◽  
Competition For Food ◽  
Variable Recruitment ◽  
The Relationship

Abstract Husebø, Å., Slotte, A., and Stenevik, E. K. 2007. Growth of juvenile Norwegian spring-spawning herring in relation to latitudinal and interannual differences in temperature and fish density in their coastal and fjord nursery areas. – ICES Journal of Marine Science, 64: 1161–1172. Norwegian spring-spawning herring (Clupea harengus) spawn in February and March along the Norwegian coast from 58°N to 69°N. The larvae are transported north with the coastal current, and in autumn, the main part of the 0-group is found in the Barents Sea, and a smaller and variable fraction ends up in coastal and fjord nursery areas that experience a wide range of environmental conditions and fish densities. Based on data from herring 0–2 years old collected from 1970 to 2004, there is a positive relationship between temperature and the growth of this coastal component, in terms of length, weight, condition factor, and annual otolith increment width, and a negative relationship between acoustic abundance and the same growth indices. In general, juvenile growth decreased northwards along the coast concurrently with decreasing summer and autumn temperatures and increasing acoustic abundance. It seems, therefore, that there may be interference in the relationship between juvenile herring growth and temperature, attributable to variable recruitment, currents, larval drift, and advection into the fjords, causing latitudinal and interannual differences in fish density, and hence variable competition for food.

Circulation phenomena and frontal dynamics of the Norwegian coastal current

1981 ◽  
Vol 302 (1472) ◽  
pp. 635-647 ◽  
Keyword(s):  
Atlantic Water ◽  
Strong Mixing ◽  
Coastal Current ◽  
General Description ◽  
The North ◽  
Dominant Feature ◽  
The North Sea ◽  
Frontal Dynamics ◽  
Norwegian Coastal Current ◽  
Signal Channel

After a short general description of the Norwegian Coastal Current, some recent investigations concerning its variability are reviewed. The variability caused by meteorological effects and fresh water fluxes is shown to be the dominant feature. The coastal current not only responds to local wind-forcing but is also a signal channel of sea-level variations in the North Sea as a whole. The variability at times manifests itself as mesoscale waves and eddies. The subsurface frontal region is characterized by interleaving of coastal and Atlantic water, and strong mixing. Lateral and longitudinal frontal motions are dealt with in relation to plumes of brackish water from the fjords and outbreaks of brackish and/or warm water masses from the Skagerrak. The inflow of Atlantic water through the Norwegian Trench, and the formation of deep and bottom water in Skagerrak are discussed.

Sign in / Sign up

Export Citation Format

Share Document