The Metabolic Basis of Productivity and the Balance of Substance and Energy

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Production refers to biomass produced per unit of time. It is essentially explored by estimating the intensity and efficiency of transformation of matter and energy. In studying the productive processes in living systems, it is often essential to combine the substance and energy aspects. This largely reveals means and forms of energy accumulation, transformation, and utilization by individuals and populations, and also evaluates energy demands for processes such as protein growth and lipid accumulation. This chapter describes the production of substance and accumulation of energy, substance and energy expenditure, consumption, transformation, and utilization of substance and energy, substance and energy budget, trophic significance of populations, and ecological metabolism. The chapter discusses the net production that includes the increment of biomass. Gross production is the total of substances synthesized, including material subsequently catabolized. Information of substance and energy expended on metabolism and growth is essential to the understanding of production in living systems. They are considered as an integrated whole. © 1999 Academic Press

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