Grey seal diet at the southern limit of its European distribution: combining dietary analyses and fatty acid profiles

@article{Ridoux2007GreySD,
  title={Grey seal diet at the southern limit of its European distribution: combining dietary analyses and fatty acid profiles},
  author={Vincent Ridoux and J{\'e}r{\^o}me Spitz and C{\'e}cile Vincent and Michael J. Walton},
  journal={Journal of the Marine Biological Association of the United Kingdom},
  year={2007},
  volume={87},
  pages={255 - 264}
}
The north-east Atlantic grey seal, Halichoerus grypus, is widely distributed along the European coastline from northern Russia to France, with the core population centred around Scotland. To date, very little is known of the diet of the species at the southern margin of the species range. However, because grey seal numbers have been increasing over the last few decades in France, the issue of their potential interactions with coastal fisheries is frequently raised. The diet of grey seal in the… Expand
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References

SHOWING 1-10 OF 37 REFERENCES
Growth and feeding habits of grey seals (Halichoerus grypus) in the northwestern Gulf of St. Lawrence, Canada
TLDR
Growth and feeding habits were determined for 82 grey seals collected in the northwestern Gulf of St. Lawrence, Canada, between 3 July and 6 December 1983 and found that a larger proportion of grey seal stomachs contained food items in July than in the other months sampled, regardless of sex or maturity status. Expand
Offshore diet of grey seals Halichoerus grypus near Sable Island, Canada
TLDR
Comparisons of prey species abundance in research trawl surveys to that in grey seal diets indicated that more abundant and more widely distributed species accounted for most of the prey eaten. Expand
The Diet of Grey Seals in the Inner and Outer Hebrides
TLDR
Investigation of seasonal and regional variation in grey seal diet around the Western Isles of Scotland found two species of flatfish, megrim and witch, were most prevalent in the diet in areas which did not correspond to their supposed preferred sea bed depth or sediment type. Expand
Use of blubber fatty acid profiles to distinguish dietary differences between grey seals Halichoerus grypus from two UK breeding colonies
TLDR
To examine the extent to which the fatty acid composition of seal depot fats can be used to distinguish between populations, blubber biopsy samples were obtained from female grey seals at 2 Scottish breeding sites and fatty acid compositions determined by gas chromatography were compared. Expand
Seasonal and Geographic Variation in the Species Composition and Size of Prey Consumed by Grey Seals (Halichoerus grypus) on the Scotian Shelf
TLDR
The grey seal population on the Scotian Shelf has grown significantly over the past 20 yr, thus increasing the potential for competitive interactions between grey seals and fisheries, and the relative contribution and size of prey eaten were estimated. Expand
Abundance estimate and seasonal patterns of grey seal (Halichoerus grypus) occurrence in Brittany, France, as assessed by photo-identification and capture–mark–recapture
TLDR
Female grey seals seem to use the Molène archipelago preferentially in summer and leave the site before the breeding season, which explains the very low local pup production, andPhilopatry may explain this pre-breeding emigration. Expand
Use of blubber fatty acid profiles to detect inter-annual variations in the diet of grey seals Halichoerus grypus
TLDR
Analysis of fatty acid profiles of female seals from 2 Scottish breeding colonies suggested a shift in diet at the Isle of May that was supported by evidence from a separate study on the analysis of otoliths in seal faeces. Expand
Comparative distribution, movements and diet of harbour and grey seals from the Moray Firth, N.E. Scotland
TLDR
The results suggest that Moray Firth harbour seals can be considered as a relatively discrete population, with clear links between breeding, feeding and resting areas, and little exchange of adults between this and adjacent breeding areas in Orkney and the Tay Estuary. Expand
Prey selection by harbour seals, Phoca vitulina, in relation to variations in prey abundance
TLDR
Diet composition was almost totally dominated by either pelagic species or species dwelling on or strongly associated with the seabed, depending upon the relative abundance of pelagic schooling prey. Expand
Size distribution of the hard remains of prey in the digestive tract of northern fur seal (Callorhinus ursinus) and related biases in diet estimation by scat analysis
TLDR
The contents of the digestive tracts of 51 seals collected in the western North Pacific off northern Japan were inspected, and the large intestines contained more fish otoliths and squid beaks than either the stomachs or the small intestines. Expand
...
1
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3
4
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