Marine Biology

, Volume 133, Issue 3, pp 495–499

Trophic ecology of Rimicaris exoculata : a combined lipid abundance/stable isotope approach

  • G. Rieley
  • C. L. Van Dover
  • D. B. Hedrick
  • G. Eglinton
Article

DOI: 10.1007/s002270050489

Cite this article as:
Rieley, G., Dover, C., Hedrick, D. et al. Marine Biology (1999) 133: 495. doi:10.1007/s002270050489

Abstract

The alvinocaridid shrimp Rimicaris exoculata is an abundant component of the biota of Mid-Atlantic Ridge hydrothermal vents. To determine the nutritional strategy of this organism, we analysed the molecular abundance and carbon isotopic composition of its phospholipid fatty acids. High abundances of n-7 fatty acids (>40% total fatty acids) were observed in R. exoculata muscle tissues, in bacterial epibionts scraped from its gill bailers, and from the bacterially infested metal sulphides that the shrimp ingest. The phospholipid fatty acid abundance data indicates that the bacteria in the sulphides are closely related to the bacterial epibiota inhabiting the shrimp gill bailers, carapace and other body parts. Compound specific δ13C analyses of the phospholipid fatty acids gave average values of −12‰ for the epibiont bacteria and −21‰ for the sulphide bacteria. This difference may be largely due to the expression of different forms of RuBisCO (Forms I and II) which fractionate against 13C to different extents. Carbon limitation within the shrimp epibiont population may be an additional factor. The δ13C values (mean = −13‰) of the saturated and monounsaturated fatty acids isolated from the muscle tissues of R. exoculata were very close to those of the epibionts, indicating that the predominant source of dietary carbon for the shrimp is their epibionts, with a lesser contribution from free-living bacteria. The δ13C values (−26‰) of shrimp cholesterol were much more negative than those of the fatty acids, and this cholesterol is likely to have derived from the oceanic photic zone.

Copyright information

© Springer-Verlag Berlin Heidelberg 1999

Authors and Affiliations

  • G. Rieley
    • 1
  • C. L. Van Dover
    • 3
  • D. B. Hedrick
    • 4
  • G. Eglinton
    • 2
  1. 1.Environmental and Analytical Section, School of Chemistry, University of Bristol, Bristol BS8 1TS, EnglandGB
  2. 2.Biogeochemistry Centre, Department of Geology, University of Bristol, Bristol BS8 1RJ, EnglandGB
  3. 3.Institute of Marine Sciences, University of Alaska at Fairbanks, Fairbanks, Alaska 99775, USAUS
  4. 4.Institute of Applied Microbiology, University of Tennessee, Knoxville, Tennessee 7932-2567, USAUS