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Acyl composition of muscle membranes varies with body size in birds.
J Exp Biol 2002; 205(Pt 22):3561-9JE

Abstract

The acyl composition of phospholipids from pectoral muscle of eight species of birds, ranging in size from the 13 g zebra finch to the 34 kg emu, were measured and combined with recent published results for a 3 g hummingbird. This represents an approximately 11000-fold range in body mass. Muscle phospholipids, and thus muscle membrane bilayers, from birds had a relatively constant unsaturated acyl chain content of 62% but exhibited a significant allometric decline in unsaturation index (number of double bonds per 100 acyl chains) with increasing body mass. There was a significant allometric increase in the percentage of mono-unsaturates and a significant allometric decline in the percentage of n-3 polyunsaturates with increasing body mass, whilst there were no significant allometric trends in either percentage of n-6 or percentage of total polyunsaturates in bird muscle. The relative content of the highly polyunsaturated docosahexaenoic acid (22:6 n-3) showed the greatest scaling with body mass, having an allometric exponent of -0.28. The contribution of this n-3 polyunsaturate to the unsaturation index varied with body size, ranging from less than a 6% contribution in the emu to approximately 70% in the hummingbird. Such allometric variation in the acyl composition of bird muscle phospholipids is similar to that observed in mammals, although birds have fewer n-3 polyunsaturates and more n-6 polyunsaturates than do mammalian phospholipids. This allometric variation in phospholipid acyl composition is discussed with respect to both the metabolic intensity and lifespan of different sized bird species.

Authors+Show Affiliations

Metabolic Research Centre, University of Wollongong, Wollongong, NSW 2522, Australia. hulbert@uow.edu.auNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

12364409

Citation

Hulbert, A J., et al. "Acyl Composition of Muscle Membranes Varies With Body Size in Birds." The Journal of Experimental Biology, vol. 205, no. Pt 22, 2002, pp. 3561-9.
Hulbert AJ, Faulks S, Buttemer WA, et al. Acyl composition of muscle membranes varies with body size in birds. J Exp Biol. 2002;205(Pt 22):3561-9.
Hulbert, A. J., Faulks, S., Buttemer, W. A., & Else, P. L. (2002). Acyl composition of muscle membranes varies with body size in birds. The Journal of Experimental Biology, 205(Pt 22), pp. 3561-9.
Hulbert AJ, et al. Acyl Composition of Muscle Membranes Varies With Body Size in Birds. J Exp Biol. 2002;205(Pt 22):3561-9. PubMed PMID: 12364409.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Acyl composition of muscle membranes varies with body size in birds. AU - Hulbert,A J, AU - Faulks,S, AU - Buttemer,W A, AU - Else,P L, PY - 2002/10/5/pubmed PY - 2003/5/17/medline PY - 2002/10/5/entrez SP - 3561 EP - 9 JF - The Journal of experimental biology JO - J. Exp. Biol. VL - 205 IS - Pt 22 N2 - The acyl composition of phospholipids from pectoral muscle of eight species of birds, ranging in size from the 13 g zebra finch to the 34 kg emu, were measured and combined with recent published results for a 3 g hummingbird. This represents an approximately 11000-fold range in body mass. Muscle phospholipids, and thus muscle membrane bilayers, from birds had a relatively constant unsaturated acyl chain content of 62% but exhibited a significant allometric decline in unsaturation index (number of double bonds per 100 acyl chains) with increasing body mass. There was a significant allometric increase in the percentage of mono-unsaturates and a significant allometric decline in the percentage of n-3 polyunsaturates with increasing body mass, whilst there were no significant allometric trends in either percentage of n-6 or percentage of total polyunsaturates in bird muscle. The relative content of the highly polyunsaturated docosahexaenoic acid (22:6 n-3) showed the greatest scaling with body mass, having an allometric exponent of -0.28. The contribution of this n-3 polyunsaturate to the unsaturation index varied with body size, ranging from less than a 6% contribution in the emu to approximately 70% in the hummingbird. Such allometric variation in the acyl composition of bird muscle phospholipids is similar to that observed in mammals, although birds have fewer n-3 polyunsaturates and more n-6 polyunsaturates than do mammalian phospholipids. This allometric variation in phospholipid acyl composition is discussed with respect to both the metabolic intensity and lifespan of different sized bird species. SN - 0022-0949 UR - http://www.unboundmedicine.com/medline/citation/12364409/Acyl_composition_of_muscle_membranes_varies_with_body_size_in_birds_ L2 - http://jeb.biologists.org/cgi/pmidlookup?view=long&pmid=12364409 DB - PRIME DP - Unbound Medicine ER -