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• W2971998185 abstract "Abstract Harbour seal populations have declined over the last 20 years in some regions around Britain. Causes are unknown but could include a reduction in prey availability which may potentially be influenced by competition with grey seals. The diets of these two marine predators overlap considerably, indicating that there could potentially be competition for prey. In this study, the diets of harbour and grey seals in 2010/2012 were compared regionally and seasonally in relation to: (a) regional variation in population trends around Britain; (b) previous information on diet; and (c) changes in the stock size of key prey to investigate whether or not patterns could be consistent with reduction in prey availability or competition. Diet was estimated from comprehensive sampling of scats around Scotland and eastern England. In total, 65,534 otoliths and beaks were recovered from 1976 harbour seal scats and 68,465 otoliths and beaks were recovered from 2205 grey seal scats collected in 2010/2012. Results showed considerable seasonal and regional variability; overall, sandeel and large gadids were the two main prey types. Patterns in diet and trends in seal population size and prey stock size indicate that harbour seals have declined in regions where they appear to be reliant on sandeel and where sandeel stocks have declined, but not in regions where sandeel have never been an important component of the diet. A possible contributing reason for the harbour seal declines may therefore be a reduction in the availability of sandeel in these regions. Sandeel continue to be an important (although reduced) prey in the diet of grey seals in regions where harbour seals have declined. If sandeel are a limiting resource, it is possible, therefore, that grey seals may reduce prey availability to harbour seals and contribute to their decline through competition." @default.
• W2971998185 created "2019-09-12" @default.
• W2971998185 creator A5035483651 @default.
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• W2971998185 date "2019-09-01" @default.
• W2971998185 modified "2023-09-30" @default.
• W2971998185 title "The diet of harbour and grey seals around Britain: Examining the role of prey as a potential cause of harbour seal declines" @default.
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• W2971998185 doi "https://doi.org/10.1002/aqc.3131" @default.
• W2971998185 hasPublicationYear "2019" @default.
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