Spatio-temporal variations in the diet and stable isotope composition of the Argentine hake Merluccius hubbsi Marini, 1933 of the continental shelf of southeastern Brazil

Autor(es)

Muto, Elizabeti Yuriko ^[1] ; Hashimoto Soares, Lucy Satiko ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Oceanog, Dept Oceanog Biol, BR-05508120 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Marine Biology; v. 158, n. 7, p. 1619-1630, JUL 2011.
• Citações Web of Science: 11

Resumo

The feeding ecology of Merluccius hubbsi was investigated in 2 regions of SE Brazil. The major food sources for the hakes were fish, crustaceans, and squid. In the upwelling system of Cabo Frio, the diet was very similar in the summers of 2001/2002 and spring 2002; fish were the most important prey followed by crustaceans. In Ubatuba, euphausiids were an important prey during the winter 2001 (100 m), while in the summer 2002, fish and amphipods predominated in the diet in the shallower site (40 m) and squid in the deeper site (100 m). The hakes showed temporal differences in stable isotope signatures in both regions, while C:N ratios varied only in Cabo Frio. delta(15)N and delta(13)C (bulk and corrected for lipid content) increased with fish length, which seems to be related to the increasing importance of fish and decreasing importance of euphausiids and amphipods in the diet of larger hakes. The mean trophic level of 3.7 for M. hubbsi was estimated using delta(15)N of bivalves as baseline and the fractionation of 3.4aEuro degrees between trophic levels. (AU)

• Processo FAPESP: 99/05454-0 - Variacoes isotopicas de delta 13c e delta 15n em peixes demerso-pelagicos do ecossistema de plataforma ao largo de ubatuba (sp) e cabo frio (rj).
• Beneficiário: Elizabeti Yuriko Muto
• Modalidade de apoio: Bolsas no Brasil - Doutorado