populations and sustainability

Question 1

Scientists have claimed that the population changes in the X species on the [area] suggests
that the [area] temperature is increasing.
They monitored water temperatures and populations of other water
animals around the [area]
Suggest two further pieces of evidence that the scientists might have found to support their claim.

Answer 1

• new diseases
• change in predator
• change in food

Question 2

Explain why the preservation of peat bog ecosystems is not a strategy that can be used in most cases

Answer 2

• most [habitat] is already damaged and requires active management and restoration

Question 3

Suggest two measures that an international treaty might impose, to prevent fishing from
causing permanent damage to the Southern Ocean.
o Identify the practical difficulties that might prevent your two measures from being effective.

Answer 3

1. fishing quotas
   - expensive to monitor
2. bigger net mesh
   - area may be too large to cover

Question 4

X species are a keystone species explain why they are

Answer 4

• many other species rely on activity of X species
• have significant effect on ecosystem

Question 5

one benefit for the reintroduction of X species

Answer 5

ecotourism

Question 6

). Increasing habitat diversity may lead to an increase in species diversity and genetic diversity.
Explain why species diversity and genetic diversity may be increased as a result of the beavers’ activity.

Answer 6

• species diversity increases because now new species live in the new habitats
• increases genetic diversity because of a range of conditions to live in