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About the Cover
Cover: Red myotomal muscle (RM) distribution patterns in the ectothermic leopard shark Triakis semifasciata and the endothermic shortfin mako shark Isurus oxyrinchus. Half transverse sections of the sharks (taken at the location of the broken line) show that the leopard shark has a laterally positioned RM and the shortfin mako has a centrally positioned RM. The light micrograph (middle) shows a transverse section of shortfin mako shark RM and the extent of capillarization of the tissue. The electron micrograph (above) of a transverse section of part of a RM fiber shows the myofibrils and mitochondria, and the cytoplasmic location of glycolytic metabolic pathways. The Krebs citric acid cycle is shown within an individual mitochondrion of mako shark RM; the activity of citrate synthase was measured as an index of aerobic capacity in shark muscle tissues. For comparative studies of high-performance swimming in these sharks, see papers by D. Bernal and coworkers (pp. 2831-2843 and 2845-2857). Drawings of the two shark species are used with permission.
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