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• W2321816301 abstract "MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections MEPS 550:249-270 (2016) - DOI: https://doi.org/10.3354/meps11718 Potential role of spiny dogfish in gray and harbor seal diets in the Gulf of Maine Carrie Byron*, Alexia Morgan Marine Science Center, University of New England, 11 Hills Beach Road, Biddeford, ME 04005, USA *Corresponding author: cbyron@une.edu ABSTRACT: Harbor seal Phoca vitulina and gray seal Halichoerus grypus populations have increased by 28.7% (1997-2001) and 8.6% (1999-present), respectively, in the Gulf of Maine. Here, we investigated what seals are eating and how their diet influences the food web in the Gulf of Maine. There is suggestion, but little evidence, that seals are eating spiny dogfish Squalus acanthias, currently an abundant species (standing stock biomass = 235000 t) in the Gulf of Maine and surrounding areas. We used an Ecopath food web model to explore the potential of dogfish being a primary food source for seals and how this may be impacting the ecosystem. We explored various plausible diets for seals and the implications for other non-prey species in the ecosystem. In addition, white sharks Carcharodon carcharias have increased in abundance regionally, and shark predation on seals is documented in the southern Gulf of Maine. We therefore also explored top-down impacts of white shark predation on seals and lower trophic level fish species. Our results suggest that (1) dogfish could be contributing to the recovery of seal populations by providing an alternative prey base, (2) there is a tipping point between 10 and 20% of dogfish in seal diet that elicits a linearly increasing trend in seal biomass over time, and (3) seals as prey will have a continued impact on the projected increase in white shark biomass. This work advances our understanding of top-down control and may help to inform fisheries and resource management. KEY WORDS: Food web · Ecopath with Ecosim · Phoca vitulina · Halichoerus grypus · Squalus acanthias · Cod · White shark · Carcharodon carcharias Full text in pdf format Supplementary material PreviousCite this article as: Byron C, Morgan A (2016) Potential role of spiny dogfish in gray and harbor seal diets in the Gulf of Maine. Mar Ecol Prog Ser 550:249-270. https://doi.org/10.3354/meps11718 Export citation RSS - Facebook - Tweet - linkedIn Cited by Published in MEPS Vol. 550. Online publication date: May 25, 2016 Print ISSN: 0171-8630; Online ISSN: 1616-1599 Copyright © 2016 Inter-Research." @default.
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• W2321816301 date "2016-05-25" @default.
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• W2321816301 title "Potential role of spiny dogfish in gray and harbor seal diets in the Gulf of Maine" @default.
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