At its simplest, labour productivity is the amount of output per worker. *Measurement of primary productivity in aquatic system measurement are two types:- 1. Measurement of primary productivity 1. In this method, a sample of water is placed into two bottles. What does primary productivity measure? Productivity, measured by gross and net primary productivity, is defined as the amount of energy that is incorporated into a biomass. One method of measuring the production of oxygen is the light and dark bottle method. Productivity is usually measured as the rate at which energy or biomass is produced per unit area per unit time. Learning Objectives Explain the concept of primary production and distinguish between gross primary production and net primary production Samples of water from different depths are placed in paired bottles. Main Difference. 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). * MEASUREMENT OF PRIMARY PRODUCTIVITY:- AQUATIC ECOSYSTEM Presented to: Presented by: Dr. S.SUNDARAMOORTHY Narpat Singh Prof. Msc. This method is employed to measure primary productivity in an aquatic ecosystem such as a pond. 3rd sem 2. 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. 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). Primary goods: Primary goods are any goods that are farmed foods and raised animals. Various light dependent oxygen consuming pathways (Mehler reaction and photorespiration) • 2) requires incubation and confinement of samples. One bottle is stored in the dark and the other in a lighted area. The more they produce, the more they contribute to profits for the company. • Measures gross and net primary production • Relatively “easy” to measure Several caveats: • 1) assumes rate of respiration in dark = light. Only respiration can occur in the bottle stored in the dark. Productivity stands for the total increase in the mass (phytomass). 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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