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Media type:
E-Article
Title:
Speeding up Growth : Selection for Mass-Independent Maximal Metabolic Rate Alters Growth Rates
Contributor:
Downs, Cynthia J.;
Brown, Jessi L.;
Wone, Bernard W. M.;
Donovan, Edward R.;
Hayes, Jack P.
imprint:
The University of Chicago Press, 2016
Published in:The American Naturalist
Language:
English
ISSN:
1537-5323;
0003-0147
Origination:
Footnote:
Description:
<p>Investigations into relationships between life-history traits, such as growth rate and energy metabolism, typically focus on basal metabolic rate (BMR). In contrast, investigators rarely examine maximal metabolic rate (MMR) as a relevant metric of energy metabolism, even though it indicates the maximal capacity to metabolize energy aerobically, and hence it might also be important in trade-offs. We studied the relationship between energy metabolism and growth in mice (<italic>Mus musculus domesticus</italic> Linnaeus) selected for high mass-independent metabolic rates. Selection for high mass-independent MMR increased maximal growth rate, increased body mass at 20 weeks of age, and generally altered growth patterns in both male and female mice. In contrast, there was little evidence that the correlated response in mass-adjusted BMR altered growth patterns. The relationship between mass-adjusted MMR and growth rate indicates that MMR is an important mediator of life histories. Studies investigating associations between energy metabolism and life histories should consider MMR because it is potentially as important in understanding life history as BMR.</p>