Spatial assessment of predator-prey relationships in the North Sea: the influence of abiotic habitat properties on the spatial overlap between 0-group cod and grey gurnard

2013 ◽  
Vol 22 (3) ◽  
pp. 174-192 ◽  
Author(s):  
Alexander Kempf ◽  
V. Stelzenmüller ◽  
A. Akimova ◽  
J. Floeter
Keyword(s):  
North Sea ◽  
Spatial Assessment ◽  
Predator Prey ◽  
Spatial Overlap ◽  
The North ◽  
Grey Gurnard ◽  
The North Sea ◽  
Abiotic Habitat ◽  
Habitat Properties

scholarly journals Running the gauntlet: the predation environment of small fish in the northern Gulf of St Lawrence, Canada

2005 ◽  
Vol 62 (3) ◽  
pp. 412-416 ◽  
Author(s):  
Daniel E. Duplisea
Keyword(s):  
Body Size ◽  
North Sea ◽  
Prey Size ◽  
Small Fish ◽  
Size Spectra ◽  
Predator Prey ◽  
The North ◽  
Prefer Prey ◽  
Seal Population ◽  
The North Sea

Abstract Predation size spectra were constructed for the northern Gulf of St Lawrence, covering prey size ranges that include pre-recruit cod. Predation by fish and harp seals was modelled with a log-normally distributed predator–prey size ratio along with a relationship between predator body size and the energy required. Fish concentrate predation on prey of weight 0.5–2 g, whereas harp seals prefer prey of 60–125 g. It is speculated that predation caused by harp seals on pre-recruits could be a major factor limiting cod recruitment in the system. The northern Gulf of St Lawrence is a cold boreal system with a large predatory seal population, and cod recruit older than elsewhere. Therefore, cod recruitment may be more strongly affected by predation in the northern Gulf of St Lawrence than in warmer systems such as the North Sea, where recruitment is strongly influenced by temperature.

Structure of Pelagic Food Chain and Relationship Between Plankton and Fish Production

1977 ◽  
Vol 34 (12) ◽  
pp. 2344-2353 ◽  
Author(s):  
R. W. Sheldon ◽  
W. H. Sutcliffe Jr. ◽  
M. A. Paranjape
Keyword(s):  
North Sea ◽  
Gulf Of Maine ◽  
Standing Stock ◽  
Phytoplankton Production ◽  
Structural Elements ◽  
Pelagic Ecosystem ◽  
Predator Prey ◽  
The North ◽  
Plankton Production ◽  
The North Sea

Further observations on the standing stocks of pelagic organisms confirm the occurrence of approximately equal biomass over logarithmically equal size ranges. A simple theoretical framework is developed that shows that the structural elements of the pelagic ecosystem can be described in terms of the sizes of predator and prey and of the efficiencies of their interactions. In practice this means that if the standing stock at any size range is known, the standing stock at any other size can be estimated, and if the growth rate at this size is known, the production can be estimated. The theory is tested on three fisheries. For the Gulf of Maine and the North Sea, phytoplankton production is estimated from fishery production. For the area off Peru the fishery production is estimated from the plankton production. Key words: pelagic ecosystem, predator–prey relationships, plankton production, marine fisheries, Peru, North Sea, Gulf of Maine

Grey gurnard (Eutrigla gurnadus) in the North Sea: an emerging key predator?

2005 ◽  
Vol 62 (8) ◽  
pp. 1853-1864 ◽  
Author(s):  
Jens Floeter ◽  
Alexander Kempf ◽  
Morten Vinther ◽  
Corinna Schrum ◽  
Axel Temming
Keyword(s):  
Functional Response ◽  
North Sea ◽  
Atlantic Cod ◽  
Population Analysis ◽  
Type Ii ◽  
Pronounced Increase ◽  
The North ◽  
Grey Gurnard ◽  
The North Sea ◽  
Type Ii Functional Response

Grey gurnard (Eutrigla gurnadus) is a widely distributed demersal species in the North Sea that has been ranked frequently among the 10 dominant species. Since the late 1980s, grey gurnard catch rates in the international bottom trawl surveys showed a pronounced increase and it was included as an "other predator" in the North Sea multispecies virtual population analysis (MSVPA) in 1997. The MSVPA results estimated grey gurnard to be responsible for approximately 60% of the total predation mortality on age-0 Atlantic cod (Gadus morhua). Long-term MSVPA predictions led to the extinction of North Sea cod. As a possible technical reason, the Holling type II functional response implemented in the model was discussed. In the current analysis, it was demonstrated that the Holling type II functional response was not responsible for the extinction of cod in the model, which was rather a true effect of high grey gurnard predation. Further, it was shown that grey gurnard predation had a significant top-down effect on whiting (Merlangius merlangus) and potentially also on cod recruitment, which was linked to the spatial distribution of the three species. Eventually, the implications of the results for North Sea cod stock recovery plans were discussed.

scholarly journals The proportion of flatfish recruitment in the North Sea potentially affected by offshore windfarms

2019 ◽  
Vol 77 (3) ◽  
pp. 1227-1237 ◽  
Author(s):  
Léo Barbut ◽  
Berthe Vastenhoud ◽  
Laurence Vigin ◽  
Steven Degraer ◽  
Filip A M Volckaert ◽  
...  
Keyword(s):  
Population Dynamics ◽  
North Sea ◽  
Wind Farms ◽  
Offshore Wind ◽  
Spawning Grounds ◽  
Spatial Overlap ◽  
Flatfish Species ◽  
The North ◽  
The North Sea ◽  
Tracking Model

Abstract Understanding the influence of man-made infrastructures on fish population dynamics is an important issue for fisheries management. This is particularly the case because of the steady proliferation of offshore wind farms (OWFs). Several flatfish species are likely to be affected because areas with OWFs in place or planned for show a spatial overlap with their spawning grounds. This study focuses on six commercially important flatfish species in the North Sea: common sole (Solea solea), European plaice (Pleuronectes platessa), turbot (Scophthalmus maximus), brill (Scophtalmus rhombus), European flounder (Platichthys flesus), and common dab (Limanda limanda). We used a particle-tracking model (Larvae&Co) coupled to a 3D hydrodynamic model to assess the effects of spatial overlap of OWFs with the species’ spawning grounds on the larval fluxes to known nursery grounds. An important overlap between planned areas of OWFs and flatfish spawning grounds was detected, with a resulting proportion of settlers originating from those areas varying from 2% to 16%. Our study suggests that European plaice, common dab, and brill could be the most affected flatfish species, yet with some important local disparities across the North Sea. Consequently, the study represents a first step to quantify the potential impact of OWFs on flatfish settlement, and hence on their population dynamics.

Sign in / Sign up

Export Citation Format

Share Document