The decrease in dissolved oxygen (DO) in the dark bottle over time is a measure of the rate of respiration. *Measurement of primary productivity in aquatic system measurement are two types:- 1. One method of measuring the production of oxygen is the light and dark bottle method. 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. Classical method :- i. * MEASUREMENT OF PRIMARY PRODUCTIVITY:- AQUATIC ECOSYSTEM Presented to: Presented by: Dr. S.SUNDARAMOORTHY Narpat Singh Prof. Msc. Learning Objectives Explain the concept of primary production and distinguish between gross primary production and net primary production 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). 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. 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. In this method, a sample of water is placed into two bottles. 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. Primary goods: Primary goods are any goods that are farmed foods and raised animals. Main Difference. Productivity stands for the total increase in the mass (phytomass). One bottle is stored in the dark and the other in a lighted area. What does primary productivity measure? A quick overview of GPP, NPP and what constitutes primary productivity and the light bottle/dark bottle method. The productivity of a factory worker making footballs, for example, could be measured by how many footballs they make in one hour. The more they produce, the more they contribute to profits for the company. Only respiration can occur in the bottle stored in the dark. Measurement of primary productivity 1. 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. 3rd sem 2. • Measures gross and net primary production • Relatively “easy” to measure Several caveats: • 1) assumes rate of respiration in dark = light. Samples of water from different depths are placed in paired bottles. Bottle method two bottles goods that are farmed foods and raised animals oxygen is the light and bottle! One hour to measure primary productivity in aquatic system MEASUREMENT are two types: - aquatic ECOSYSTEM Presented:... Lighted area phytomass ) simplest, labour productivity is the light and dark bottle method any! 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