Ontogenetic Diet Comparison of Atlantic Cod and White Hake Occurring at Historically Low Population Abundances

Autor: John Mark Hanson
Rok vydání: 2011
Předmět:
Zdroj: Transactions of the American Fisheries Society. 140:1070-1077
ISSN: 1548-8659
0002-8487
DOI: 10.1080/00028487.2011.607049
Popis: Abundances of Atlantic cod Gadus morhua and white hake Urophycis tenuis have dropped to historically low levels in the southern Gulf of St. Lawrence. Stomach samples were collected during late summer 2001 and 2002 to compare ontogenetic diet patterns at a time when food presumably was not limiting. White hake had a narrow diet and showed an abrupt ontogenetic diet change: fish less than 35 cm total length (TL) consumed benthic invertebrates (sevenspine bay shrimp Crangon septemspinosa, gammarid amphipods, or polychaetes), while those at least 35 cm TL preyed mainly on Atlantic herring Clupea harengus. Atlantic cod had a broad diet initially dominated by benthic and pelagic invertebrates (Arctic argid Argis dentata, Aesop shrimp Pandalus montagui, Eualus spp., mysids, northern propeller clams Cyrtodaria siliqua, and polychaetes). Fish (mainly Atlantic herring, capelin Mallotus villosus, and small demersal species) were gradually incorporated into the Atlantic cod diet but did not comprise more tha...
Databáze: OpenAIRE
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