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Molecular diet analysis of Anguilliformes leptocephalus larvae collected in the western North Pacific
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Molecular diet analysis of Anguilliformes leptocephalus larvae collected in the western North Pacific
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Molecular diet analysis of Anguilliformes leptocephalus larvae collected in the western North Pacific
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Journal Article
Molecular diet analysis of Anguilliformes leptocephalus larvae collected in the western North Pacific
2019
Overview
Natural diets of leptocephalus larvae have been enigmatic. In this study, we collected DNA samples from the gut contents and body surface of leptocephali belonging to the five Anguilliform families (Anguillidae, Chlopsidae, Congridae, Muraenidae, and Serrivomeridae) from the northwest Pacific and performed next-generation 18S rDNA sequencing. Wide variety of eukaryotes was detected in both samples, from which eight eukaryotic groups (jellyfish, conoid parasite, tunicate, copepod, krill, segmented worm, fungi, and dinoflagellate) were selected on the basis of abundance. All groups except conoid parasites were common in both the samples. Cnidarian 18S rDNA reads were the most abundant in both the samples; however, the number of samples having cnidarian reads and the read counts were significantly higher in the body surface scraping samples than in the gut content samples, regardless of careful rinsing of the body surface. These results indicate that the cnidarian DNAs are most likely found because of cross contamination from the body surface and/or environment. 18S rDNA read counts of copepod and tunicate in the gut contents were greater than or comparable with those in the body surface scraping samples, which may correspond to the previous observations of fecal pellets and larvacean houses in the leptocephali gut. Thus, the present study supports previous implications that leptocephali utilize detritus materials, so called marine snow.
Publisher
Public Library of Science,Public Library of Science (PLoS)
Subject
/ Animal Nutritional Physiological Phenomena
/ Animals
/ Detritus
/ Diet
/ DNA
/ Eels
/ Fishes
/ Fungi
/ Housing
/ Krill
/ Larva - growth & development
/ Larvae
/ Plankton
/ Research and Analysis Methods
/ Scraping
