6.3.2 Populations + Sustainability

Question 1

Factors that limit max size of population

Answer 1

Food
Water
Light
O2
Nesting sites 
Shelter
Parasites 
Predators

Question 2

Typical pattern of population change in predator-prey relationship

Answer 2

Prey is eaten by predator 
= increasing predator population 
= decreasing prey population
= competition for food 
= predator population decreases
= more prey survive

Question 3

Intraspecific and interspecific competition

Answer 3

Intra = competition between organisms of the same species

Inter = competition between organisms of different species

Question 4

Conversation vs preservation

Answer 4

Conservation = maintains biodiversity of a habitat by allowing sustainable use of resources there

Preservation = maintains biodiversity of habitat by minimising human impact

Question 5

Why do we conserve + preserve habitats

Answer 5

Economic = food so our economy, natural pest control, tourism

Social = many organisms can be used in medicine, aesthetic

Ethical = responsibility to maintain habitats for future generations

Question 6

Sustainability

Answer 6

Using resources in a way that also maintains them for future generations

Question 7

Methods that allow sustainable use of ecosystems resources

Answer 7

Timber production:

• Coppicing to encourage growth
• Replacing felled trees
• Selective cutting

Fishing

• stocks not depleted
• no overfishing
• can continue indefinitely

Question 8

Example of how conflict between conservation + human needs can be balanced
(Terai Rgeion of Nepal)

Answer 8

Terai region (Nepal)

Over exploited for use in fuel
Locals now have a responsibility to look after the forest
‘Corridors’ placed to enable migration

Question 9

Example of how human effects are controlled in sensitive ecosystems
(Galapagos islands)

Answer 9

Many species endangered due to hunting and tourism

New species introduced but caused damage to native species. Trying to find balance