Spatial and temporal shifts in stable isotope values of the bottom-dwelling shrimp<Emphasis Type="Italic"> Nauticaris marionis</Emphasis> at the sub-Antarctic archipelago |
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Authors: | Email author" target="_blank">E?A?PakhomovEmail author J?W?McClelland K?Bernard S?Kaehler J?P?Montoya |
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Institution: | (1) Department of Zoology, Faculty of Science and Technology, University of Fort Hare, Private Bag X1314, 5700 Alice, South Africa;(2) The Ecosystem Center, Marine Biological Laboratory, 7 MBL Street, Woods Hole, MA 02543, USA;(3) Department of Zoology and Entomology, Rhodes University, P.O. Box 94, 6140 Grahamstown, South Africa;(4) Coastal Research Group, Department of Zoology and Entomology, Rhodes University, P.O. Box 94, 6140 Grahamstown, South Africa;(5) School of Biology, Georgia Institute of Technology, 310 Ferst Drive, Atlanta, GA 30332-0230, USA;(6) Present address: Department of Earth and Ocean Sciences, University of British Columbia, 6339 Stores Road, Vancouver, British Columbia, V6T 1Z4, Canada |
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Abstract: | Spatial and temporal dynamics of carbon and nitrogen stable isotope signatures of the bottom-dwelling caridean shrimp Nauticaris marionis were measured during April and May between 1984 and 2000 in the vicinity of Marion Island (the Prince Edward Islands, Southern Ocean). There was one trophic-level enrichment in bulk 15N and 13C signatures between small (<20 mm long) and large (>20 mm) specimens of N. marionis, suggesting distinct trophic differentiation among major shrimp size groups. Both 15N and 13C values of N. marionis increased with the depth, reflecting changes in their diet. There were no clear temporal trends in bulk 15N signatures of N. marionis. However, compound-specific 15N measurements of amino acids indicated that N. marionis from the inter-island realm occupied the trophic level of second order carnivores, while similarly sized shrimps in the near-shore realm were at the trophic level of first order carnivores. Compound-specific measurements also identified a change in the source of inorganic nitrogen at the base of the food web between the inter-island and near-shore realms. In contrast to the bulk 15N values, a significant shift in bulk 13C values of N. marionis was observed between 1984 and more recent years. This temporal change appears to be linked to changes in the overall productivity of the Prince Edward Island inter-island system, which could be linked to global climate change.Communicated by J.P. Thorpe, Port Erin |
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