Unit 6 - Population and Sustainability Flashcards

You may prefer our related Brainscape-certified flashcards:
1
Q

Stages on population graph

A

Slow growth
Rapid growth - resources plentiful, reproductive rate > mortality rate
Stable state (no growth) - mortality = reproduction
Cannot support a larger pop. due to carrying capacity, small fluctuations

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Populations can

A

Remain stable
Rise or fall suddenly
Oscillate up and down w. the reg. pattern

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Predator prey interactions

A

When predator pop increases, more prey eaten
Prey pop decreases, less food available for predator s
W/ less food, fewer predators survive so their pop. decreases
W/ fewer predators, fewer prey are eaten so their pop. increases
More prey = more food, predator pop. increases
Two populations are in eqm and stable due to -ve feedback

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

When does competition occur

A

When there are not enough resources to satisfy all of the organisms that depend on them

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Examples of interspp comp. affecting population

A

Red and grey squirrels - Invasive species
May leads to extinction of one species
Greater specialisation to avoid competition
Change in distribution of the species

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Competitive exclusion principle

A

2 competitive species cannot coexist at the same population level esp if ones staring population is higher than the other

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Scramble competition

A

Relies on all individuals finding food and nest sites by chance this allows natural selection as some may be better adapted than others

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Dominance hierarchy

A

Strongest, most dominant individuals breed and pass on their alleles - if there’s only 1 dominant individual there is likely to be less variation in the next gen.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Measuring distribution

A

Line or belt transects (systematic sampling)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Measuring plant abundance

A

Randomly placed quadrats
No. of individuals in sample / Area of sample

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Measuring animal abundance

A

Capture, mark, release, recapture (all occurs in orig. sample area)
(no. in first sample * no in 2nd sample) / no. of recaptured marked individuals

How well did you know this?
1
Not at all
2
3
4
5
Perfectly