Populations in ecosystems

Question 1

Populations of different species form what?

Answer 1

A community

Question 2

What does a community and the non-living components of it’s environment together form?

Answer 2

an ecosystem

Question 3

ecosystems can range in what?

Answer 3

Size from very small to very large

Question 4

within a habitat what does a species occupy ?

Answer 4

A niche

Question 5

What is a niche governed by?

Answer 5

both abiotic and biotic conditions

Question 6

What does an ecosystem support a certain size of and what is it called

Answer 6

population of a species

- carrying capacity

Question 7

population size can vary as a result of?

Answer 7

• affect of abiotic factors

- interactions between organisms : inter-specific and intrapecific competition and predation

Question 8

the size of a population can be estimated using

Answer 8

• randomly placing quadrats, or quadrats along a belt transect, for slow moving or non-motile organisms
• mark-capture-release method for motile organisms.

Question 9

Are ecosystems dynamic ?

Answer 9

Yes

Question 10

What basically happens at each stage in succession

Answer 10

• certain species may be recognised which change the environment so that it becomes more suitable for other species with different adaptions
• the new species may change the environment in such a way that it becomes less suitable for the previous species

Question 11

changes that organisms produce in their abiotic environment can result in what

Answer 11

in a less hostile environment and change biodiversity

Question 12

what does conservation of habitats frequently involve?

Answer 12

management of succession