Marine Biology

, Volume 143, Issue 6, pp 1213–1227 | Cite as

Marine lipids in a cold coastal ecosystem: Gilbert Bay, Labrador

Research Article

Abstract

Some organisms living in coastal bays in Newfoundland and Labrador have to contend with sub-zero temperatures for most of the year. The goal of this study was to examine the lipid composition of the food web in such an environment in order to obtain information on essential nutrients and trophic relations. In August 2000, plankton, 16 species of macroinvertebrates, and sediments were collected in a shallow, sheltered bay, Gilbert Bay, southern Labrador (52°35′N; 55°50′W). Plankton had higher proportions of ω3 fatty acids (39±5%) and lower proportions of bacterial fatty acids (5±2%), while sediments had 12±5% ω3 fatty acids and 15±9% bacterial fatty acids. Plankton ω3 fatty acids levels and sediment bacterial fatty acid levels were higher than in equivalent samples previously collected further south, in Newfoundland. Benthic macroinvertebrates contained 0.5±0.4% of their wet weight as lipid, of which 45±15% was triacylglycerol. Levels of ω3 fatty acids were high and relatively constant across phyla, accounting for 36±11% of the total fatty acids. Compared to other invertebrates, echinoderms had a unique fatty acid composition, which was characterized by high levels of 20:4ω-6 (9±6%), bacterial fatty acids (8±4%), and ∑20:1+22:1 monoenoic fatty acids (13±6%). Baseline lipid data from plankton and macroinvertebrates showed constantly high levels of polyunsaturated fatty acids, indicating their physiological importance at low temperatures.

Notes

Acknowledgements

We wish to thank Dr. J. Wroblewski, Dr. C. McKenzie, Dr. T. Avery, J. Wells, and S. Fraser for help with field sampling, phytoplankton identification, shipping logistics, computer assistance, and nutrient analysis. "Coasts Under Stress", a Canadian collaborative research program, NSERC, and SSHRC funded this work.

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Copyright information

© Springer-Verlag 2003

Authors and Affiliations

  1. 1.Ocean Sciences CentreMemorial University of NewfoundlandSt. John'sCanada
  2. 2.Chemistry DepartmentMemorial University of NewfoundlandSt. John'sCanada

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