1. 5/3 Agenda
Deforestation: human impact, photosynthesis, energy transfer, primary productivity, biodiversity
Turn in: Practice cladogram questions
Homework:
1. Transformation Video and Notes
2. Transformation FRQ practice question

2. Deforestation Overview
Deforestation: destroying trees/plants, usually in reference to rainforests or large areas of trees
Human impact: Humans are cutting down trees for a variety of reasons
Farming
Agriculture
Developments
Increase in human population plays a role
Less trees=less photosynthesis-->High CO2, lower O2
Primary Productivity is lower
Less Energy/Food Available for Primary Consumers
Throws a whole ecosystem out of balance

3. Deforestation

4. Human Impact Humans are the reasons for deforestation
There are a variety of reasons that deforestation happens
This is just one example of human impacts on the environment
As the human population increases, the impact on the environment also increases

5. Population Growth Exponential vs. Logistic
Carrying capacity exists for all populations
At the most basic, population growth equals births minus deaths
The equations get more complicated once growth rates and carrying capacity are accounted for

6. Population Growth Equations

7. Biodiversity
Ecosystems with a high amount of biodiversity are more stable
More likely to survive fluctuations in the environment or natural disasters
Deforestation is one example of how biodiversity decreases
Can also decrease by invasive species or extinction
Causes a snowball effect
If one food source dies off, whatever eats is may also die off, and so on and so on
Keystone species play a major role in food webs and ecosystem balance

8. Energy Transfer
The amount of available energy decreases as you go up in trophic level
At each level, the organism uses the majority of the energy for life processes, so only about 10% is available to be passed on to the next consumer
Remember that energy is never destroyed, just transferred into different forms
As deforestation destroys trees, that leaves less energy and food for primary consumers, which can affect the whole food chain

9. Primary Productivity
Gross primary production= amount of chemical energy plants produce in a given time
Net primary productivity= GPP– energy used in cellular respiration
NPP is the amount of energy left over for consumers
This can be thought of as biomass added to the plant (glucose)

10. Group Review Assignment
Pick Two Topics:
Human impact
Population Growth
Biodiversity
Energy Transfer
Primary Productivity
Ecosystems Overall
Create 1 review resource for each topic
Concept maps
Practice problems
Quizlets
Flashcards
Posters
Storybook
Diagrams/Pictures
Example calculation
Share your review resources with your group by the end of class
Theses will be graded as a classwork grade.