Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Population & the Environment > 3.2.4.5 Principles of Population Ecology > Flashcards

3.2.4.5 Principles of Population Ecology Flashcards

1
Q

biotic potential

A

in population ecology, the natural reproductive potential of the species

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

environmental resistance

A

explain mortality rates controlled by environmental factors that prevent survival (disease or shortage of food)

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

biosphere

A

biological component of earth systems

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

carrying capacity

A

maximum population size that an area or environment can sustain indefinitely

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

ecological footprint

A

a measure of the demand placed by humans on earths natural ecosystems

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

overshoot

A

referring to a point when the population and its associated consumption of resources exceed the long-term carrying capacity of its environment

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

total productive bio-capacity

A

all the food, water and energy resources produced by the earths natural systems annually to sustain us

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

Population ecology

A

Population growth determined by BR and DR

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

BR are controlled by

A

The reproductive or biotic potential of the species - a rate that evolves over time and related to survival rates of the young

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

DR controlled by

A

Environmental factors that limit survival

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

Density independent environmental factors

A

Not influenced by population size and density e.g. Natural hazards

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Density dependent environmental factors

A

influenced by population size and density e.g. Food supply and disease

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

When the biotic potential is greater than the environmental resistance…

A

The population grows

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

The population has overcome environmental resistance so…

A

The population has grown rapidly

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

World population stable for most of history due to

A

High BR and DR (famine and disease)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

If population outstrips resources

A

Overpopulation occurs

17
Q

When resources are greater than demands

A

Underpopulation occurs

18
Q

Overpopulation

A

When there are too many people in the area relative to the available resources putting pressure on those resources

19
Q

Underpopulation

A

When there are too few people to use the resources efficiently for a given level of technology

20
Q

one global hectare (gha)

A

represents the average productivity of all biologically productive areas (cropland/forests/fishing grounds etc) on earth in a given year

21
Q

global hectares per person

A

amount of global hectares needed by each person to provide for their consumption of resources

22
Q

carrying capacity depends on

A

the average lifestyle in different parts of the world

23
Q

countries with a higher demanding lifestyle will have

A

a lower carrying capacity- more developed countries

24
Q

how is carrying capacity calculated

A

taking earth’s total productive bio-capacity and dividing by the total population which is how many global hectares are available per person on earth

25
Q

reason for greatest growth in ecological footprint

A

carbon (doubled 1960-2010)

26
Q

negative impacts of ecological footprint

A

climate change, more landed needed for settlement, industry and transport, extinct species, reduction of crops and soil quality, depletion of fish stocks, degradation of ecosystems

27
Q

what does Rees state

A

we are already in a state of overshoot reaching ‘overshoot day’ in 2014 so now in ecological debt

28
Q

what the logistic model shows

A

the rate of increase of global scale population growth declines as more environmental resistance or limiting factors are encountered (food/water) reaching a state of equilibrium

29
Q

what is the population, resources and pollution model (PRP)

A

how all organisms interact with their environment (see pg 193 revision guide)

30
Q

positive feedback on the PRP model

A

where one activity increases another moving it away from equilibrium to an unstable state

31
Q

negative feedback on the PRP model

A

where one activity reduces another thereby achieving equilibrium

32
Q

cross-media contamination

A

pollution that can contaminate many areas (acid rain affects forests/rivers/lakes)

Population & the Environment (6 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions