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Acyl composition of muscle membranes varies with body size in birds

A. J. Hulbert^1,2,*, S. Faulks², W. A. Buttemer² and P. L. Else^1,3

¹ Metabolic Research Centre, University of Wollongong, Wollongong, NSW 2522, Australia
² Department of Biological Science, University of Wollongong, Wollongong, NSW 2522, Australia
³ Department of Biomedical Science, University of Wollongong, Wollongong, NSW 2522, Australia

View larger version (18K): [in a new window]   Fig. 1. The allometric relationship between body mass and basal metabolic rate for the nine bird species used in the current study. See Table 1 for details of individual species.

View larger version (35K): [in a new window]   Fig. 2. Allometric plots of the acyl composition of skeletal muscle phospholipids of birds. (A) Unsaturation index, UI (total number of double bonds per 100 acyl chains), (B) unsaturated acyl chains, UFA (C) polyunsaturated (PUFA; open circles) and mono-unsaturated (MUFA; closed circles) acyl chains, and (D) n-6 (closed circles) and n-3 (open circles) polyunsaturated acyl chains. Values are means ± S.E.M. N=4 for all values with error bars; NS, not significant. M, body mass.

View larger version (37K): [in a new window]   Fig. 3. Allometric plots of acyl composition of skeletal muscle phospholipids of birds. (A) Palmitic acid (closed circles) and stearic acid (open circles), (B) oleic acid (closed circles) and vaccenic acid (open circles), (C) linoleic acid (open circles) and arachidonic acid (closed circles), (D) eicosapentanoic acid (open circles) and docosahexaenoic acid (closed circles). Values are means ± S.E.M. N=4 for all values with error bars; NS, not significant. M, body mass. For further details, see text.

View larger version (20K): [in a new window]   Fig. 4. Contribution of docosahexaenoic acid (22:6 n-3) to the total number of double bonds in the skeletal muscle phospholipids of birds. N=4 for all values.

View larger version (27K): [in a new window]   Fig. 5. Linear correlations between basal metabolic rate BMR of birds and (A) mono-unsaturate content, (B) n-3 polyunsaturate content, (C) docosahexaenoic acid, 22:6 n-3 content, and (D) unsaturation index of skeletal muscle phospholipids.