Stable-isotope analysis of a deep-sea benthic-fish assemblage: Evidence of an enriched benthic food web

Primary tabs

Boyle, M. D., Ebert, D. A., & Cailliet, G. M. (2012). Stable-isotope analysis of a deep-sea benthic-fish assemblage: Evidence of an enriched benthic food web. Journal of Fish Biology, 80(5), 1485-1507. doi:10.1111/j.1095-8649.2012.03243.x
Metadata
TitleStable-isotope analysis of a deep-sea benthic-fish assemblage: Evidence of an enriched benthic food web
AuthorsM. Boyle, D. Ebert, G. Cailliet
AbstractIn this study, fishes and invertebrates collected from the continental slope (1000 m) of the eastern North Pacific Ocean were analysed using stable-isotope analysis (SIA). Resulting trophic positions (T P) were compared to known diets and habitats from the literature. Dual isotope plots indicated that most species groups (invertebrates and fishes) sorted as expected along the carbon and nitrogen axes, with less intraspecific variability than interspecific variability. Results also indicated an isotopically distinct benthic and pelagic food web, as the benthic food web was more enriched in both nitrogen and carbon isotopes. Trophic positions from SIA supported this finding, resulting in the assignment of fishes to different trophic positions from those expected based on published dietary information. These differences can be explained largely by the habitat of the prey and the percentage of the diet that was scavenged. A mixing model estimated dietary contributions of prey similar to those of the known diet of Bathyraja trachura from stomach-content analysis (SCA). Linear regressions indicated that trophic positions calculated from SIA and SCA, when plotted against B. trachura total length for 32 individuals, exhibited similar variation and patterns. Only the T P from SCA yielded significant results (stomach content: P < 0·05, stable isotope: P > 0·05). © 2012 The Authors. Journal of Fish Biology © 2012 The Fisheries Society of the British Isles.
JournalJournal of Fish Biology
Date2012
Volume80
Issue5
Start page1485
End page1507
ISSN0022-1112
Subjectscarbon, nitrogen, animal, article, biological model, biota, diet, ecosystem, fish, food chain, invertebrate, Pacific Ocean, physiology, skates (fish), statistical model, stomach juice, Animals, Carbon Isotopes, Fishes, Gastrointestinal Contents, Invertebrates, Linear Models, Models, Biological, Nitrogen Isotopes, Bathyraja trachura, Invertebrata, Pisces
NoteCited By (since 1996):6, Fish and Fisheries, Ecology, CODEN: JFIBA

Bookmark

Bookmarks: