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A Level Biology - 6.3.2 Populations and sustainability > Interactions between populations > Flashcards

Interactions between populations Flashcards

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1
Q

What is neutralism?

A

No effect on either species

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2
Q

What is commensalism?

A

An increase in one species and no effect on the other

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3
Q

What is competition?

A

A negative effect on both species

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4
Q

What is mutualism?

A

A positive effect on both species

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5
Q

What is predation?

A

A positive effect on one species and a negative effect on another species

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6
Q

What is predation and paracitism?

A

A positive effect on one species and a negative effect on another species

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7
Q

What is the effect of limited resources?

A

Leads to competition and effects growth rate

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8
Q

What is intraspecific competition?

A

Competition between the same species

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9
Q

What is the effect of intraspecific competition?

A

Keeps population steady but is intense as same requirements and same means of obtaining them

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10
Q

What is the importance of intraspecific competition?

A

Keeps best selected for natural selection

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11
Q

What is interspecific competition?

A

Competition between different species

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12
Q

When does interspecific competition occur?

A

When 2 niches overlap and the greater the overlap, the more likely competition will occur, and when new species are introduced it competes with existing species

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13
Q

What is the effect of interspecific competition?

A

Either one species wins, or it is shared

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14
Q

What is the competitive exclusion principle?

A

One species ‘wins’ and one species ‘loses’

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15
Q

When is coexistence of species possible?

A

When there is no-overlap of niches

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16
Q

How can interspecific competition affect natural selection?

A

Evolution by natural selection occurs towards separate niches occurs so they are as different as possible to minimise competition

17
Q

What is the result of very heavy competition?

A

Too much overlap leads to competitive exclusion so one species must go

18
Q

What happens with species with different size niches?

A

A species with a smaller niche can avoid competition as it is more specialist

19
Q

What are important for controlling population?

A

Predation and competition

20
Q

What is a predator?

A

An organism that eats part of all of another organism

21
Q

What is a prey?

A

An organism that gets eaten by another organism

22
Q

What does the prey graph look like?

A

Identical waves, with the predator line being delayed by the prey line

A Level Biology - 6.3.2 Populations and sustainability (5 decks)

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