Hennemann (1983) provided empirical support for McNab's (1980) hypothesis that a higher specific metabolic rate (SMR) in mammals translates into a higher intrinsic rate of increase (rm). However, the few marine mammals in Hennemann's data base were excluded from any detailed analyses because their “high rates of metabolism but only average or low values ofrm” (p. 106) were thought to reflect trade-offs between maintenance and production necessary to compensate for heat loss in aquatic environments (Hennemann 1983, also see McNab 19
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