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Environmental Science > 2.5 Population Ecology > Flashcards

2.5 Population Ecology Flashcards

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Biology 101 flashcards
1
Q

Define Ecology

A

Scientific study of interactions. Organisms versus organisms, organisms versus environment.

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2
Q

What are the levels of Ecological Studies?

A
  • Organismal Ecology
  • Population Ecology
  • Community Ecology
  • Ecosystem Ecology
  • Landscape Ecology
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3
Q

What is Organismal Ecology?

A

Interaction between individual organism and the environment.

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4
Q

What is Population Ecology?

A

Interactions WITHIN a population.

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5
Q

What is Community Ecology?

A

Interactions between DIFFERENT populations.

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6
Q

What is Ecosystem Ecology?

A

Interactions between communities and abiotic components.

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7
Q

What is Landscape Ecology?

A

Interaction between ecosystems.

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8
Q

Habitat

A

Were an organism lives.

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9
Q

Niche

A

Functioning role of organism within habitat.

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10
Q

Native Species

A

Species occurring naturally in an area.

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11
Q

Non-Native Species

A

Intentionally or accidentally introduced into an unnatural environment.

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12
Q

Invasive Species

A

Non-native that causes harm.

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13
Q

Indicator Species (Bioindicators)

A

Species that are sensitive to environmental change.

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14
Q

Keystone Species

A

Species that play a critical role in maintaining a community.

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15
Q

Population Size

A

Number of individuals present.

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16
Q

Population Density

A

Number of individuals per one unit of area.

17
Q

Population Distribution (Dispersion)

A

Special arrangement of organisms.

18
Q

Random Population Distribution

A

Resources are widespread thereby not turning arrangement.

19
Q

Uniform Population Distribution

A

Territorial, competition.

20
Q

Clumped Population Distribution

A

Arrangement dependent on resources.

21
Q

Sex Ratios

A

Proportion of females versus males.

22
Q

Age Structure (Distribution)

A

Relative number of individuals in each age group.

23
Q

Calculating Population Growth

How do you find the rate of natural increase?

A

Natural increase = birth rate - death rate

24
Q

Calculating Population Growth

How do you find the population growth rate?

A

Population Growth Rate = (Births - Deaths) + (Immigration - Emigration)

Expressed in numbers per 1000 individuals per year

25
Q

What is exponential growth?

A

The population increases by a fixed percent. Graft as a J shaped curve.

26
Q

Unregulated populations increase ________

A

Exponentially

27
Q

When are nature do unregulated populations increase exponentially?

A

When there are small populations, low competition, and ideal conditions

28
Q

What is a logistic growth curve?

A

And S shaped curve that shows how limiting factor slow and stop exponential growth.

Environmental Science (2 decks)

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