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首页> 外文期刊>Marine ecology >Ontogenetic shifts in feeding habits of orangemouth weakfish (Cynoscion xanthulus): From estuarine benthic feeder to marine nektivore top predator
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Ontogenetic shifts in feeding habits of orangemouth weakfish (Cynoscion xanthulus): From estuarine benthic feeder to marine nektivore top predator

机译:Ontogenetic shifts in feeding habits of orangemouth weakfish (Cynoscion xanthulus): From estuarine benthic feeder to marine nektivore top predator

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摘要

Orangemouth weakfish is a highly important commercial and game fish species in theTropical Eastern Pacific. However, studies assessing changes in its trophic ecologyrelevant to size, habitat (estuarine or marine), sex, and season are non-existent.Weassessed its feeding habits and trophic position (TP) according to the aforementionedfactors. Its dietary breadth was composed of 33 types of prey. The feeding habitsand isotopic values (δ~(15)N and δ~(13)C) registered differences between sizes and habitat,indicating ontogenetic changes in habitat as well as TP, as small organisms (TP 3.1)inhabited the estuarine area, feeding on benthic and demersal organisms, whilst largeindividuals (TP 4.1) were found in the marine environment, preying on nektonic fauna.No differences were found according to sex or season. The isotopic niche showedthat the different sizes of this species are generalist consumers with a clear separationbetween them and between habitats, as estuarine juvenile and preadult organismshave a larger isotopic niche than adult marine organisms, being an opportunist tertiaryestuarine consumers during their early stages, and a top marine predator during theadult phase.

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