Starter Trophic LevelProductivity (units?) Producers5000 Primary consumers500 Secondary consumers50 Tertiary consumers5 1.Using the data provided, draw.

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Presentation transcript:

Starter Trophic LevelProductivity (units?) Producers5000 Primary consumers500 Secondary consumers50 Tertiary consumers5 1.Using the data provided, draw a pyramid of productivity. 2.What are the units for productivity? – include them 3.What does productivity represent in organisms? 4.How much energy passes from one trophic level to the next?

Learning outcomes You should all be able to: Define gross productivity, net productivity, primary productivity and secondary productivity Most of you should be able to: Calculate the values of gross and net productivity from given data

What is productivity? Thinking about ecosystems – how do you think we measure productivity?

There are two types of productivity What do you think the difference is? Discuss it with a partner now write down your idea on the sheet

Primary Productivity - plants Conversion of solar energy Carbon dioxide from the atmosphere Water from the soil Oxygen released Sunlight

What factors affect primary productivity? Amount of sunlight Availability of factors needed for growth Levels of insolation Supply of water Temperature Nutrient levels Efficiency of producers

Secondary Productivity - animals

These two types can be divided… Gross productivity Net productivity What do you think the difference is? Gross productivity is the total gain in energy or biomass per unit area per unit time Net productivity is the remaining energy that is available to the next trophic level.

GPP and NPP What can you see happening in the diagram? How would you calculate GPP and NPP?

GSP and NSP

GROUP ACTIVITY pyramid of productivity

Starter 1.What does NPP stand for? 2.What does it mean? 3.How would you calculate it? 4.What about GSP?

pyramid of productivity

NPP - Low Arctic TundraSonoran Desert

NPP - High Tropical Rainforest

Checking outcomes What is net productivity and gross productivity? What is primary and secondary productivity? How can you calculate NPP? How can you calculate GSP?