Unit 3 Threats To Biodiversity

Question 1

List the four key threats to biodiversity

Answer 1

1) Over exploitation of resources
2) bottleneck affect
3) invasive species
4) Habitat fragmentation

Question 2

What’s the difference between exploitation and over exploitation

Answer 2

Exploitation means making the best use of resources
Whilst over exploitation is when individuals are removed from a population so fast that it succeeds the species rate of reproduction

Question 3

Why is over exploitation a threat to diversity

Answer 3

Over exploitation can cause many populations to thin out/lose many numbers and could also lead in severe cases to extinction

Question 4

What might cause the bottleneck affect

Answer 4

Natural disasters

Question 5

Why is the bottleneck affect so significant as a threat to diversity

Answer 5

It is significant as there is a severe loss in population/loss of diversity due to loss of genetic variation

Question 6

Define and introduce species

Answer 6

And introduce species is a non-native species that has been introduced by humans intentionally or accidentally to new geographical locations

Question 7

Define a naturalised species

Answer 7

A natural I species is an introduce species that has become established

Question 8

Define an invasive species

Answer 8

And invasive species are natural I species that spread rapidly and eliminate the native species

Question 9

Give an example of an invasive species

Answer 9

Stoats

Question 10

Why are invasive species so successful

Answer 10

Invasive species are successful as they like any natural predators parasites or pathogen is that would limit population growth

Question 11

Why are invasive species a threat to diversity

Answer 11

As they prey on native species/compete with them
E.g. habitat food water
This equals a smaller population for the native species or in severe cases can lead to extinction

Question 12

Why might the creation of habitat corders have a negative impact on a population

Answer 12

As alleles won’t be so varied so Introduction of disease and pathogens are a lot more likely to white post a view of population if not all of the population

Question 13

Why is habitat fragmentation a threat to diversity

Answer 13

Habitat fragmentation is an issue because often result in a decrease of biodiversity a species richness is lost less species equals lower species diversity as they’re more likely to share the same alleles