NDLI: Long-term changes in the spiny dogfish (Squalus acanthias) trophic role in the southwestern Atlantic

Content Provider	Springer Nature Link
Author	Belleggia, Mauro Figueroa, Daniel Enrique Sánchez, Felisa Bremec, Claudia
Copyright Year	2011
Abstract	We used a comprehensive dataset on the diet of Squalus acanthias in the southwestern Atlantic Ocean (35–55°S) to test the hypothesis that fishery has caused a decrease in the trophic level of this species (fishing down process). Of 3,644 stomachs examined between the years 1985 and 2010, 2,214 (60.77%) contained prey items. Generalized linear models were used to evaluate the support in our data for five explanatory variables (sex, predator’s total length, season, region and decade) that may explain the consumption of the given prey. The frequency of fish, mainly Merluccius hubbsi, and benthos in the stomachs decreased through time, whereas the squid Illex argentinus and jellyfishes exhibited positive trends. The trophic level of S. acanthias declined from the 1980s to the 1990s due to the high consumption of prey items at lower trophic levels. On the other hand, the consumption of argentine anchovy, Engraulis anchoita, an underexploited species, did not reveal changes through time.
Starting Page	57
Ending Page	67
Page Count	11
File Format	PDF
ISSN	00188158
Journal	Hydrobiologia
Volume Number	684
Issue Number	1
e-ISSN	15735117
Language	English
Publisher	Springer Netherlands
Publisher Date	2011-12-15
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Chondrichthyes Squalidae Trophic ecology Fishing down Marine ecosystem Fisheries Argentine Sea Freshwater & Marine Ecology Zoology Ecology
Content Type	Text
Resource Type	Article
Subject	Aquatic Science

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Parasites of North Sea spiny dogfish, Squalus acanthias L. (Selachiiformes, Squalidae)

Age and growth of spiny dogfish Squalus acanthias (Squalidae, Chondrichthyes) in pacific waters off the Kuril Islands

Age and Growth of Spiny Dogfish Squalus acanthias ( Squalidae : Chondrichthyes ) in the North Aegean Sea

Fecundity of Northeast Atlantic spurdog (Squalus acanthias)

Maturity, reproductive cycle and fecundity of the spiny dogfish Squalus acanthias (Chondrichthyes: Squalidae) off the Languedocian coast (southern France, northern Mediterranean)

Feeding habits and dietary overlap in spiny dogfish Squalus acanthias (Squalidae) and narrowmouth catshark Schroederichthys bivius (Scyliorhinidae)

Bycatch of the piked dogfish Squalus acanthias Linné, 1758 (Chondrichthyes, Squalidae) in semi-pelagic longline fisheries at the Patagonian Shelf

Conservation of spiny dogfish squalus acanthias: a role for cites? mary lack (2006).

Spatiotemporal overlap of spiny dogfish (Squalus acanthias) and commercial fisheries in the northeast U.S. shelf large marine ecosystem

Long-term changes in the spiny dogfish (Squalus acanthias) trophic role in the southwestern Atlantic

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Parasites of North Sea spiny dogfish, Squalus acanthias L. (Selachiiformes, Squalidae)

Age and growth of spiny dogfish Squalus acanthias (Squalidae, Chondrichthyes) in pacific waters off the Kuril Islands

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