* 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. Various light dependent oxygen consuming pathways (Mehler reaction and photorespiration) • 2) requires incubation and confinement of samples. Primary goods: Primary goods are any goods that are farmed foods and raised animals. In this method, a sample of water is placed into two bottles. Only respiration can occur in the bottle stored in the dark. A quick overview of GPP, NPP and what constitutes primary productivity and the light bottle/dark bottle method. Samples of water from different depths are placed in paired bottles. Learning Objectives Explain the concept of primary production and distinguish between gross primary production and net primary production Main Difference. 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. *Measurement of primary productivity in aquatic system measurement are two types:- 1. 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. The decrease in dissolved oxygen (DO) in the dark bottle over time is a measure of the rate of respiration. 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). Measurement of primary productivity 1. One method of measuring the production of oxygen is the light and dark bottle method. At its simplest, labour productivity is the amount of output per worker. The more they produce, the more they contribute to profits for the company. Classical method :- i. Productivity, measured by gross and net primary productivity, is defined as the amount of energy that is incorporated into a biomass. Productivity stands for the total increase in the mass (phytomass). 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