Limits on species distributions

Question 1

Why is the Kangaroo not in the centre of Australia and the edges of Australia

Answer 1

Dispersal limitations - urban areas limits, ocean limits
Biotic - Competition between humans and other animals
Abiotic - Not in the centre due to it being the hottest area, they arent outside of australia because they cannot swim elsewhere.

Question 2

Abiotic definition

Answer 2

a non-living part of an ecosystem that shapes its environment (temp etc)

Question 3

Biotic definition

Answer 3

a living organism that shapes its environment

Question 4

Interactions between species

Answer 4

Predation, parasitism, competition, mutualism/facilitation

Question 5

Facilitation / complex interactions

Answer 5

Presence of one species may accidentally enable others presence(Eco system engineers such as beavers).
Sometimes this may happen through complex chains of interactions

Question 6

Abiotic limits

Answer 6

Climate, substrate, water chemistry, water depth, light intensity, turbidity.