1. 5.3.2 Populations and Sustainability
By Ms Cullen

2. Predator/Prey Relationships

3. Predator/Prey Relationships Can you explain the graph?

4. Competition There are two types of competition:
Intraspecific competition – this occurs between members of the same species.
Interspecific competition – this occurs between members of different species.

5. Intraspecific competition
As population numbers drop, so will competition within a population.
Conversely as population numbers rise, so will competition for resources between individuals.

6. Interspecific competition
This can affect both size (abundance) and distribution of populations within an ecosystem.

7. Conservation or preservation? What is the difference?

8. Why do you think we need to conserve species and resources?
Brainstorm

9. Economic reasons

10. Ecological Reasons

11. Aesthetic and Ethical Reasons

12. Sustainability
Successful management of resources leads to sustainability.
Sustainability is the management of a resource or system, so that it is replenished at the same rate that it is used.
Sustainability has become increasingly important as our world population grows and their is increasing competition for resources.
Can you think of examples of sustainability?

13. Galapagos Islands - ecotourism
Threats
Increased population
Overfishing
Tourism
Why have these issues become threats?
What can be done to limit the impact?
Can some of them be advantageous?
How would you promote ecotourism and responsible travelling?

14. Home study:
Sustainability – Notes on timber production in a temperate country – coppicing, pollarding etc OCR A2 P Find images of internet.
Interspecific Competition - Using P in OCR A2 books and graphs on Paramecium (week 25 in your handbooks)
- explain work carried out by Gause on interspecific competition.
- explain the process of allelopathy.