MEPS 419:211-222 (2010)  -  DOI: https://doi.org/10.3354/meps08827

Ontogenetic diet shifts in the reef fish Pseudanthias rubrizonatus from isolated populations on the North-West Shelf of Australia

David O. Cummings1,*, David J. Booth2, Raymond W. Lee3, Stephen J. Simpson1, Adele J. Pile1

1School of Biological Sciences (A08), University of Sydney, Sydney, New South Wales 2006, Australia
2Department of Environmental Sciences, University of Technology, Sydney, PO Box 123, Sydney, Broadway, New South Wales 2007, Australia
3School of Biological Sciences, Washington State University, PO Box 644236, Pullman, Washington 99164-4236, USA

ABSTRACT: The red-barred anthias Pseudanthias rubrizonatus is a common tropical deep reef fish species found in Australia, but little is known about its dietary preferences and trophic interactions. We examined the gut contents and stable isotope signatures (δ13C and δ15N) of P. rubrizonatus from populations on the North-West Shelf of Australia to determine differences in diet relative to site, depth and fish size. We sampled 5 fish populations from a series of sub-sea structures, from 82 to 152 m depth, which had been submerged for up to 15 yr. Gut content analysis suggested that P. rubrizonatus displays an opportunistic feeding strategy and utilises both pelagic and benthic resources, including larval fishes, heteropods, isopods and mysids. Stable isotope analyses revealed that at all depths P. rubrizonatus underwent an ontogenetic diet shift. Values for δ13C in muscle ranged from –19.7‰ for small fish to –16.2‰ for larger individuals, and δ15N ranged from 8.2‰ for smaller fish to 13.2‰ for larger fish, indicating that a diet shift occurs at the end of juvenile development between 30 and 50 mm standard length. By simultaneously analysing gut contents and stable isotope signatures of the collected specimens, we have documented opportunistic dietary strategies that may assist P. rubrizonatus to colonise isolated structures.


KEY WORDS: Stable isotopes · Gut contents · Trophic interactions · Feeding strategies · Petroleum structures · Artificial reefs · Indian Ocean


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Cite this article as: Cummings DO, Booth DJ, Lee RW, Simpson SJ, Pile AJ (2010) Ontogenetic diet shifts in the reef fish Pseudanthias rubrizonatus from isolated populations on the North-West Shelf of Australia. Mar Ecol Prog Ser 419:211-222. https://doi.org/10.3354/meps08827

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