Post on 31-Dec-2015
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Metabolic capacities in vertebrates
• Aerobic capacity is the maximum rate of oxygen consumption during vigorous, exhaustive exercise. Generated principally by the sustained contraction of oxidative muscle fibers and measured as VO2max.
• Anaerobic capacity is the maximum rate of energy production from anaerobic glycolysis during exercise. Generated principally by the power contribution of glycolytic muscle fibers and estimated by the accumulation of lactic acid.
Functional correlates of inter- and intra-specific variation in metabolic capacities
• Ecological--predict or account for patterns of distribution and activity
• Evolutionary--contribute to an understanding of the evolutionary origin of complex physiological structures (oxidative fibers) and processes (endothermy)
Behavioral correlates of inter-specific variation in metabolic capacities
Study included 17 species of frogs and toads from around the world, representing broad ecological, morphological, and behavioral ranges
Ambush foragers--high anaerobic capacity
QuickTime™ and a decompressor
are needed to see this picture.
Burrowing/active foragers--high aerobic capacities
QuickTime™ and a decompressor
are needed to see this picture.
Aerobic capacity model for the evolution of endothermy
• Proposed by Bennett and Ruben, 1979• Focus of selection for metabolic physiology is
on activity, not temperature• High aerobic capacities correlate with
endurance and stamina• High aerobic capacity for exercise is
functionally linked to resting or basal metabolism
Bocas del Toro, Panama
Remote chain of islands in the Caribbean, located between Costa Rica and Panama
Wells and Taigen and UConn Physiological Ecology Class
Reproductive behavior and aerobic capacities of male
American toads (Bufo americanus): Is behavior constrained by physiology?
Measurement of VO2calling
Repeated gas samples taken from enclosed metabolic chamber while animals are stimulated to call. The microphone records vocal behavior and calling activity
Does individual variation in CS activity correlate with calling
behavior?
Yes, in a complicated way…