Metabolic rate and membrane fatty acid composition in birds: a comparison between long-living parrots and short-living fowl |
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Authors: | Email author" target="_blank">Magdalene?K?MontgomeryEmail author A?J?Hulbert William?A?Buttemer |
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Institution: | (1) Diabetes & Obesity Program, Garvan Institute of Medical Research, Darlinghurst, NSW, 2010, Australia;(2) School of Biological Sciences, University of Wollongong, Wollongong, NSW, 2522, Australia;(3) Centre for Integrative Ecology, Deakin University, Waurn Ponds, VIC, 3217, Australia |
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Abstract: | Both basal metabolic rate (BMR) and maximum lifespan potential (MLSP) vary with body size in mammals and birds and it has
been suggested that these are mediated through size-related variation in membrane fatty acid composition. Whereas the physical
properties of membrane fatty acids affect the activity of membrane proteins and, indirectly, an animal’s BMR, it is the susceptibility
of those fatty acids to peroxidation which influence MLSP. Although there is a correlation between body size and MLSP, there
is considerable MLSP variation independent of body size. For example, among bird families, Galliformes (fowl) are relatively
short-living and Psittaciformes (parrots) are unusually long-living, with some parrot species reaching maximum lifespans of
more than 100 years. We determined BMR and tissue phospholipid fatty acid composition in seven tissues from three species
of parrots with an average MLSP of 27 years and from two species of quails with an average MLSP of 5.5 years. We also characterised
mitochondrial phospholipids in two of these tissues. Neither BMR nor membrane susceptibility to peroxidation corresponded
with differences in MLSP among the birds we measured. We did find that (1) all birds had lower n-3 polyunsaturated fatty acid
content in mitochondrial membranes compared to those of the corresponding tissue, and that (2) irrespective of reliance on
flight for locomotion, both pectoral and leg muscle had an almost identical membrane fatty acid composition in all birds. |
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