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