Fig. 1. A survey of the levels of the mitochondrial enzyme citrate synthase found in skeletal muscles of vertebrates. Values were obtained from the literature for tree swallows Tachycineta bicolour (Burness et al., 2001) rufous hummingbird Selasphorus rufus (Suarez et al., 1991), carp Cyprinus carpio (Moyes et al., 1992), skipjack tuna Katsuwanis pelamis (Moyes et al., 1992), swordfish (Tullis et al., 1991) and cultured mouse myoblasts (Moyes et al., 1997). Values for rat muscles, largemouth bass Micropterous salmoides are unpublished. All values are standardized to 25°C using a Q₁₀ of 1.9 for citrate synthase (Moyes et al., 1992).

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