3.2 Ecology Flashcards

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1
Q

What is species richness (R)?

A

Number of species found in given area

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2
Q

What is the formula for the Shannon Wiener index (H)?

A

H = -SUM(Pi*ln[Pi])

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3
Q

What does Pi stand for in the Shannon Wiener index?

A

Relative abundance

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4
Q

What does ni stand for in the Shannon Wiener index?

A

Number of individuals in species i

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5
Q

What does N stand for in the Shannon Wiener index?

A

Total number of individuals in all species

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6
Q

What does it mean if a community has a Shannon Wiener index of 6?

A

The community has a lot of diversity

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7
Q

What does it mean if a community has a Shannon Wiener index of 0.2?

A

Very little diversity, one species is more dominant than others

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8
Q

What is the formula for species evenness (E)?

A

E = H/ln(R)

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9
Q

What does it mean if a community has an evenness of 1?

A

There is an equal number of individuals for all species

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10
Q

What does it mean if a community has an evenness of 0.2

A

Community is not very even, one species is more dominant than other

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11
Q

Why is it good for a community to be diverse?

A

So it has more stability and can adapt to different environmental situations

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12
Q

If a population is bigger, will it have more or less genetic diversity?

A

More genetic diversity

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13
Q

What is ecosystem diversity?

A

Range of habitat types, variation within ecosystem

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14
Q

How does primary succession begin?

A

begins with virtually lifeless land without soil, then pioneer plants like lichen and bacteria make soil

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15
Q

What are some plants that can be found in the pioneer community stages of primary sucession?

A

grasses, shrubs, lichen, mosses, ferns

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16
Q

How is secondary succession different from primary succession?

A

There is no soil at first during primary succession, but there is still some leftover soil in secondary succession.