environmental science > Population Regulation > Flashcards

Population Regulation Flashcards

(18 cards)

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1
Q

What are the abiotic factors of a habitat?

A
  • Light availability
  • Water availability
  • Nutrient availability
  • pH
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2
Q

What are the biotic factors of a habitat?

A
  • Food availability
  • Presence of predators
  • Pollination
  • Seed dispersal
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3
Q

What is carrying capacity?

A

The maximum population size that an area can sustainably support

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4
Q

Which 2 types of factors affect population size?

A
  • Density dependent factors
  • Density independent factors
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5
Q

What is a density dependent factor?

A

A factor affecting population size whose effect increases as population density increases

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6
Q

What is a density independent factor?

A

A factor affecting population size whose effect does not increase as population density increases

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7
Q

What are some examples of density dependent factors?

A
  • Food availability
  • Disease
  • Resource competition
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8
Q

What are some examples of density independent factors?

A
  • Temperature change
  • Flooding
  • Drought
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9
Q

What is the pattern of a sigmoidal population growth curve?

A
  1. Population rises in a fresh setting
  2. Rises rapidly
  3. Plateaus then fluctuates
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10
Q

What happens when a population reaches carrying capacity?

A

Stable fluctuating phase

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11
Q

How do predators and prey control population size?

A

Self-regulation

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12
Q

What are 3 examples of artificial population control?

A
  • CBR programmes
  • Removal/introduction of invasive species
  • Culling (e.g. deer)
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13
Q

What is an r-selected species?

A

A species that responds quickly to a decline in population

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14
Q

What is a k-selected species?

A

A species that responds slowly to a decline in population

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15
Q

What are the characteristics of r-selected species?

A
  • Reach sexual maturity quickly
  • Produce many offspring
  • Contribute few resources to their offspring
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16
Q

What are the characteristics of a k-selected species?

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A
  • Reach sexual maturity slowly
  • Produce few offspring
  • Contribute many resources to their offspring
17
Q

What are some examples of r-selected species?

Study These Flashcards
A
  • Locusts
  • Spiders
  • Frogs
18
Q

What are some examples of k-selected species?

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A
  • Elephants
  • Whales
  • Sharks
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