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BIOL4 > Populations > Flashcards

Populations Flashcards

1
Q

Define Population

A

All the organisms of one species in a habitat

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2
Q

Define Habitat

A

A location where an organism lives in the ecosystem

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3
Q

Define Community

A

All of the populations of different species in a habitat

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4
Q

Define Niche

A

The role of a species within it’s habitat

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5
Q

Define Abundance

A

The number of individuals of one species in a particular area

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6
Q

Define Distribution

A

Where a particular species is within the area you’re investigating

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7
Q

Outline mark-release-recapture

A
  • Capture a sample of the species
  • mark them then release them back into their habitat.
  • Wait an appropriate length I time
  • Take a second sample and count how many of this sample is marked
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8
Q

What is the mark-release-recapture equation?

A 
Number marked in 2nd sample
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9
Q

What assumptions does mark-release-recapture make?

A
  • The mark doesn’t rub off
  • there are few, if any births or deaths
  • there’s no immigration or emigration
  • the marked individuals distribute themselves evenly
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10
Q

Biotic factors affecting population size?

A
  • Disease
  • Predation
  • Food Source
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11
Q

Abotic factors affecting population size?

A
  • Temperature
  • Light
  • Humidity
  • Water
  • pH
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12
Q

Define Intraspecific competition

A

Competition within the same species

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13
Q

Define Interspecific competition

A

Competition between different species

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14
Q

What is the Population Growth equation?

A

(Births+immigration)-(deaths+emigration)

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15
Q

What factors affect birth rates?

A
  • economic conditions
  • cultural and religious backgrounds
  • social pressures and conditions
  • birth control
  • political factors
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16
Q

What is the birth rate equation?

A

Number of births in a year
——————————— x1000
Total pop in the same year

17
Q

Factors affecting death rates?

A
  • age profile
  • life expectancy at birth
  • food supply
  • safe drinking water/effective sanitation
  • medical care
18
Q

What is the death rate equation?

A

Number of deaths in a year
———————————- x1000
Total pop in the same year

19
Q

Describe a demographic transition

A
  • occurs in economically well developed nations
  • large increase in life expectancy
  • reduction in birth rates
  • re-establishes growth curve
20
Q

What is the population growth rate equation?

A

Pop change during period
——————————— x100
Pop at start of period

21
Q

Define Ecosystem

A

All the organisms living in a particular area with all biotic and abiotic conditions

BIOL4 (7 decks)

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