Classical method :- i. This method is employed to measure primary productivity in an aquatic ecosystem such as a pond. Measurement of primary productivity 1. Whether one measures the rate at which photosynthesis occurs, or the rate at which the individual plant increases in mass, one is concerned with primary production (definition: the synthesis and storage of organic molecules during the growth and reproduction of photosynthetic organisms). A quick overview of GPP, NPP and what constitutes primary productivity and the light bottle/dark bottle method. What does primary productivity measure? The decrease in dissolved oxygen (DO) in the dark bottle over time is a measure of the rate of respiration. Only respiration can occur in the bottle stored in the dark. Productivity stands for the total increase in the mass (phytomass). Daniel G. Milchunas, Biases and Errors Associated with Different Root Production Methods and Their Effects on Field Estimates of Belowground Net Primary Production, Measuring Roots, 10.1007/978-3-642-22067-8, (303-339), (2012). Productivity, measured by gross and net primary productivity, is defined as the amount of energy that is incorporated into a biomass. • Measures gross and net primary production • Relatively “easy” to measure Several caveats: • 1) assumes rate of respiration in dark = light. The more they produce, the more they contribute to profits for the company. One method of measuring the production of oxygen is the light and dark bottle method. Samples of water from different depths are placed in paired bottles. In this method, a sample of water is placed into two bottles. * MEASUREMENT OF PRIMARY PRODUCTIVITY:- AQUATIC ECOSYSTEM Presented to: Presented by: Dr. S.SUNDARAMOORTHY Narpat Singh Prof. Msc. Productivity is usually measured as the rate at which energy or biomass is produced per unit area per unit time. At its simplest, labour productivity is the amount of output per worker. The productivity of a factory worker making footballs, for example, could be measured by how many footballs they make in one hour. It is based upon the assumption that the amount of oxygen produced is proportional to gross production because one molecule of oxygen is produced for each atom of carbon fixed. Learning Objectives Explain the concept of primary production and distinguish between gross primary production and net primary production Main Difference. primary productivity OVERVIEW: Primary production is estimated from 14 C uptake using a simulated in situ technique in which the assimilation of dissolved inorganic carbon by phytoplankton yields a measure of the rate of photosynthetic primary production in the euphotic zone. 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