Download 5.3.2 populations and sustainability student version

5.3.2 Populations and
Sustainability
By Ms Cullen
Predator/Prey Relationships
Predator/Prey Relationships
Can you explain the graph?
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.
Intraspecific competition
• As population numbers
drop, so will
competition within a
population.
• Conversely as
population numbers
rise, so will competition
for resources between
individuals.
Interspecific competition
• This can affect both size
(abundance) and
distribution of
populations within an
ecosystem.
Conservation or preservation?
What is the difference?
Conservation
Preservation
Why do you think we need to
conserve species and resources?
Brainstorm
Economic reasons
Ecological Reasons
Aesthetic and Ethical Reasons
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?
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?
Home study:
• Sustainability – Notes on timber production in a
temperate country – coppicing, pollarding etc OCR
A2 P.208-209. Find images of internet.
• Interspecific Competition - Using P.206 -7 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.