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A trophic study of a marine ecosystem off southeastern Australia using stable isotopes of carbon and nitrogen

Citation

Davenport, S and Bax, NJ, A trophic study of a marine ecosystem off southeastern Australia using stable isotopes of carbon and nitrogen, Canadian Journal of Fisheries and Aquatic Sciences, 59, (3) pp. 514-530. ISSN 0706-652X (2002) [Refereed Article]

DOI: doi:10.1139/f02-031

Abstract

The stable isotopes of carbon and nitrogen were used to investigate trophic relationships of fish and invertebrates on the continental shelf of southeastern Australia. We examined 87 fish species, marine mammals, penguins, invertebrates, algal samples, suspended particulate organic matter (POM), and sediments. The main source of primary production is oceanic phytoplankton, although there is evidence of a seagrass contribution to the benthos. Marine mammals, penguins, some benthic invertebrates, and some benthic fish filled the highest trophic positions. Sources of variability in isotope results included temporal (POM, some fish) and spatial (POM, sediments) elements, bottom depth (some fish), and size (some fish). Fish had muscle δ15N values of 9.6% to 14.7% and δ13C values of -20.6% to -14.6%. Cluster analysis on fish stable isotope results produced fish groups that could be interpreted with trophic and habitat information. Trophic relationships in fish, suggested by stable isotope results, were supported by stomach contents analysis. Stable isotope results may indicate more representative trophic relationships, as stomach contents analyses tend to group prey by taxon rather than by trophodynamic position. In fish and invertebrates, stable isotope results related more to functional patterns of feeding than to taxonomic relationships.

Item Details

Item Type:Refereed Article
Research Division:Agricultural and Veterinary Sciences
Research Group:Fisheries Sciences
Research Field:Aquatic Ecosystem Studies and Stock Assessment
Objective Division:Animal Production and Animal Primary Products
Objective Group:Fisheries - Wild Caught
Objective Field:Fisheries - Wild Caught not elsewhere classified
Author:Bax, NJ (Professor Nicholas Bax)
ID Code:47793
Year Published:2002
Web of Science® Times Cited:156
Deposited By:TAFI - Marine Research Laboratory
Deposited On:2007-09-21
Last Modified:2011-09-27
Downloads:0

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