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Metabolic enzyme activities across an altitudinal gradient: an examination of pikas (genus Ochotona)

Brandon A. Sheafor

Department of Biology, Mount Union College, Alliance, OH 44601, USA

View larger version (17K): [in a new window]   Fig. 1. Enzyme activities from ventricular cardiac muscle of pikas collected across an altitudinal gradient: Russian pikas (Ochotona hyperborea) residing at sea level (N=4), collared pikas (Ochotona collaris) residing at 1070 m (N=9) and North American pikas (Ochotona princeps) residing at 3350 m (N=8). Values are means ± S.E.M. CS, citrate synthase; HOAD, ß-hydroxyacyl CoA dehydrogenase; LDH, lactate dehydrogenase.

View larger version (24K): [in a new window]   Fig. 2. Differences in metabolic enzyme and isozyme activities between pika species residing at high altitude (Ochotona princeps from 3350 m) and low altitude (Ochotona collaris from 1070 m). Activities are shown for three tissues: heart (H), diaphragm (D) and vastus lateralis (V). Values are means ± S.E.M. Error bars for total LDH activities are smaller than the symbols used. N=8 for O. princeps total LDH values, N=9 for O. collaris total LDH values. N=3 for all isozyme analyses. CS, citrate synthase; LDH, lactate dehydrogenase; H-LDH, heart-type lactate dehydrogenase.