Trophic status and trophic interactions of common predatory fish species of the West Kamchatka shelf

Autor: V. V. Napazakov
Rok vydání: 2015
Předmět:
Zdroj: Journal of Ichthyology. 55:86-96
ISSN: 1555-6425
0032-9452
DOI: 10.1134/s0032945215010130
Popis: Feeding and trophic relationships have been studied for the common benthic predatory fish species of the West Kamchatka shelf in 2008—the Pacific cod Gadus macrocephalus, great sculpin Myoxocephalus polyacanthocephalus, plain sculpin M. jaok, sea raven Hemitripterus villosus, and whitespotted greenling Hexagrammos stelleri. Crustaceans and fish are the main food components of the great sculpin, plain sculpin, Pacific cod, and whitespotted greenling; sea raven feeds on the fish mostly. The ontogenetic changes of the food spectra have been tracked for all the studied species. The indexes of the food similarity evidence to the possible food competition between the Pacific cod and all the other species; however, the dissimilarity of the ecological niches may serve as the adaptation to decrease the food competition. The trophic levels of all the studied predators vary from 3.41–4.50; i.e., they are the tertiary consumers. It is justified that the Pacific cod, whitespotted greenling, plain sculpin, and great sculpin are the facultative polyphagous predators, and the sea raven is the obligate bentho- and ichthyophagous species on the West Kamchatka shelf.
Databáze: OpenAIRE
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