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Biology > C24 Populations and Sustainability > Flashcards

C24 Populations and Sustainability Flashcards

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1
Q

Biotic factors which affect population size

21.1 Population Size

A
  • predators
  • competition
  • pathogens
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2
Q

Abiotic factors which affect population size

21.1 Population Size

A
  • water availability
  • oxygen
  • light
  • temperature
  • CO2 concentration
  • soil PH
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3
Q

Maximum Capacity

21.1 Population Size

A

The maximum possible possible

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4
Q

Niche

21.1 Population Size

A

The organisms job within the ecosystem e.g apex predators

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5
Q

Population

21.1 Population Size

A

the number of individuals of one species which live in one area

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6
Q

Population Growth Curve
1.Lag Phase

21.1 Population Size

A
  • period of slow growth
  • biotic and abiotic factors are favourable
  • birth rate is higher than death rate
  • population increases slowly - low birth rate
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7
Q

Population Growth Curve
2.Exponential Growth

21.1 Population Size

A
  • period of rapid growth
  • birth rate significantly higher than the death rate
  • population multiplies rappidly
  • biotic and abiotic factors are favourable
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8
Q

Population Growth Curve
3.Stable Phase

21.1 Population Size

A
  • period of stable phase
  • biotic and abiotic factors limit population growth
  • population fluctuates but remains stable
  • birth and death rates approximatly equal
  • carrying capacity has been reached
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9
Q

Animal competition

24.2 Competition

A
  • food
  • teritory
  • mates
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10
Q

Plant competition

24.2 Competition

A
  • light
  • space -> minerals and water
  • pollinators
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11
Q

Interspecific Competion Definition

24.2 Competition

A

competition between two or more different species

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12
Q

Why does interspecific competition occur

24.2 Competition

A

when the niches are too similar

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13
Q

Intraspecific competition definition

24.2 Competition

A

competition between members of the same species

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14
Q

Interspecific Competition

24.2 Competition

A
  • reduced resources between 2 or more species
  • results in smaller populations
  • if 2 species compete one will be better adapted so the other will become outcompeted
  • if the conditions remain the same the less adapted can not exist in the smae habitat
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15
Q

Define
Competitive exclusion principle

24.2 Competition

A

where two species are competing for the same resources, the one which uses the resources more effectivley will eliminate the other

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16
Q

Intraspecific Graph
1.

24.2 Competition

A
  • when a resource is plentyfull all organisms can survive
  • there is high birth rates and low death rates
  • the carrying capacity is exceeded
17
Q

Intraspecific Graph
2.

24.2 Competition

A
  • there is more individuals than resources so there is competition
  • not all individuals can survive
  • the death rate will exceed the birth rate
  • population decreases
18
Q

Intraspecific Graph

24.2 Competition

A
  • less competition exists so less organisms compete for resources
  • more organisms can survive
  • population increseses
19
Q

Predation

24.3 Predator-Prey Relationships

A

where an organism kills and eats another organism

20
Q

Pedator-Prey relationships

24.3 Predator-Prey Relationships

A
  • predator prey relatioships were interlinked
  • when one population changes it causes the other to change
21
Q

Predator- Prey Relationship
Graph- stage 1

24.3 Predator-Prey Relationships

A
  • increase in prey population provides more food for predetors
  • this allows more predators to reproduce and survive
  • increase in predator population
22
Q

Predator-Prey Relationship
Graph- stage 2

24.3 Predator-Prey Relationships

A
  • increased predator population eats more prey
  • decline in prey population
  • death rate of prey population exceeds birth rate
23
Q

Predator-Prey Relationship
Graph- stage 3

24.3 Predator-Prey Relationships

A
  • reduced prey population cannot support the large predator population
  • intraspecific competition for food increases
  • decrease in the predator population
24
Q

Predator-Prey Relationship
Graph- stage 4

24.3 Predator-Prey Relationships

A
  • reduced predator population results in less prey being killed
  • more prey organisms survive
  • prey reproduce so population increases
25
Q

Factors affecting
Predator-Prey relationship

24.3 Predator-Prey Relationships

A
  • availability of food for plants for the prey
  • presence of other predators
  • abiotic factors
  • disease

Biology (7 decks)

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