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

作者：Belleggia Mauro^*; Enrique Figueroa Daniel; Sanchez Felisa; Bremec Claudia

来源：Hydrobiologia, 2012, 684(1): 57-67.

DOI：10.1007/s10750-011-0967-y

• Chondrichthyes
• Squalidae
• Trophic ecology
• Fishing down
• Marine ecosystem
• Fisheries
• Argentine Sea

We used a comprehensive dataset on the diet of Squalus acanthias in the southwestern Atlantic Ocean (35-55A degrees 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.

• 出版日期2012-3