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Free Content Trophic interrelations of the three most abundant fish species from Laguna San Ignacio, Baja California Sur, Mexico

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We analyzed the trophic interrelations of cominate sea catfish Arius platypogon, shortfin weakfish Cynoscion parvipinnis, and California king croaker Menticirrhus undulatus from Laguna San Ignacio, B.C.S., Mexico during spring and summer 1992. Four different trophic groups were found on the basis of feeding preferences; crustaceans, fish, mollusks, and polychaetes. Each predator species has a preference for specific prey. For A. platypogon, the dominant prey was Callinectes bellicosus; for C. parvipinnis, the species Penaeus californiensis and Ophistonema libertate were the main prey; and for M. undulatus, the dominant preys were P. californiensis and Donax sp. The food habits of these predator species have some seasonal and spatial changes, however according to the Morisita-Horn index no significant trophic overlap exists. The results of this study show the coexistence of these predator species are a function of a spatial segregation and the distribution of available food resources in the lagoon.

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Document Type: Research Article

Publication date: 2000-03-01

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  • The Bulletin of Marine Science is dedicated to the dissemination of high quality research from the world's oceans. All aspects of marine science are treated by the Bulletin of Marine Science, including papers in marine biology, biological oceanography, fisheries, marine affairs, applied marine physics, marine geology and geophysics, marine and atmospheric chemistry, and meteorology and physical oceanography.
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