PRODUCTIVITY “Just measuring your productivity……” –2.5.5 define the terms gross productivity, net productivity, primary productivity, secondary productivity –2.5.6 calculate GPP and NPP

 What is the stuff?  How does it produce it?  What does it require to produce it? HOW MUCH STUFF DOES A PLANT PRODUCE

 Animal How does the animal increase its mass? How does the animal lose mass?

 INGESTION DEFINITIONS Measure how much mass the animal gained Day 1Day 2 Weight (g) Gain Animal (Write definition) You are given some food for your animal.

CALCULATING EGESTION How could you find out how much mass was lost? Weight its poop!! These are the losses  EGESTION – write definition

CALCULATING EGESTION What was the mass of ingestion? _______ What was mass of egestion? _______ How much of the weight gain was incorporated into the animal? ________ This weight gain (after losses) is called assimilation

 ASSIMILATION GROSS SECONDARY PRODUCTIVITY Write definition Add to your definition: Assimilation = Gross Secondary Productivity = ingestion - egestion

 Matter is lost in the form of faeces and ________  The process of releasing energy from glucose is called _____  During __________, energy is lost in the form of heat QUICK CHECK

 How else might matter be lost besides the process of egestion? NET SECONDARY PRODUCTIVITY

 Energy being converted from a more useful form to a less useful form is the second law of thermodynamics  Objective – describe how the first and second laws of thermodynamics are related to environmental systems 2 ND LAW OF THERMODYNAMICS

SO WHAT ABOUT PRIMARY PRODUCERS? What does the plant need its ‘lump of stuff’ for? Make plant parts from your lump of stuff The sun’s energy is used to make g_____________ in plants g___________ can be used for energy for growth and other essential functions

SO WHAT ABOUT PRIMARY PRODUCERS? A plant also loses mass but not through egestion.

SO WHAT ABOUT PRIMARY PRODUCERS? Day 1Day 2 Weight (g) Gain Plant How was mass lost from a plant? ___________________________________ How is mass gained in a plant? ________________________________ If we could stop one of these from happening, we could measure the difference to get an idea about the amount gained only from one of these processes. How could we stop one of these from happening without killing the plant?

Day 1Day 2 Weight (g) Difference Plant in dark Plant in light Loss from respiration 5g Gain after respiration AND photosynthesis 3g Gain from photosynthesis 8g SO WHAT ABOUT PRIMARY PRODUCERS?

Day 1Day 2 Weight (g) Difference Plant in dark Plant in light Loss from respiration 5g Net Primary Productivity Gain after respiration AND photosynthesis 3g Gross Primary Productivity Gain from photosynthesis 8g

QUICK CHECK  During __________, energy is lost in the form of heat  Energy being converted from a more useful form to a less useful form is the __________ law of thermodynamics

 Gross Primary Productivity  Net Primary Productivity  Assimilation  Ingestion  Egestion  Gross Secondary Productivity  Net Secondary Productivity DEFINITIONS