Unit V Assesment (ecology)
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QUESTION 1

The number of species within a community is usually greatest when: a disturbance occurs. a low frequency of disturbance occurs. an intermediate frequency of disturbance occurs. a high rate of disturbance occurs.

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QUESTION 2

According to the figure, which species is considered a pioneer species?

Bromus techtorum

Bromus carinatus

Nassella pulchra

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Bouteloua curtipendula

QUESTION 3

What is an example of secondary succession? Grasses colonizing sand dunes Lichens colonizing a rock Weeds colonizing a volcanic lava flow Crabgrass colonizing an abandoned wheat field

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QUESTION 4

Which of the following are late successional species? Trees Grass Weeds Forbs

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QUESTION 5

Which of the following is NOT a general relationship? Increasing patch size is related to increased species diversity. Increasing patch size is related to increased population size. Increasing patch size is related to increased edge-to-core ratio. Increased body size is related to increased home range.

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QUESTION 6

Match the question to the correct answer.

The sequence of communities from the pioneer community to the climax community is called a(n) ________.

Early successional species are referred to as ________ species.

Succession that occurs on a site that was previously unoccupied by another community is called ________ succession.

Environmental change is a direct result of the organisms within the ________ community.

The patchwork of different types of

patch

edge

Island biogeography

autogenic

community

connectivity

Intermediate disturbance

corridors

mosaic

pioneer

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L. M.

p yp land cover is called a(n) ________ .

Strips of habitat that connect habitat patches are referred to as ________.

Within a mosaic, a(n). ________ is a relatively homogeneous community type, differing from its surroundings in both structure and species composition.

The ________ effect refers to the rich diversity of life that occurs along the border between adjacent habitat patches, represented by species from both adjacent patches and species adapted to edge habitats.

A(n) ________ species lives within the borders of a habitat patch, avoiding edges where habitat change is abrupt.

The degree to which the landscape facilitates or impedes the movement of organisms among patches is called ________.

p

interior

sere

primary

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QUESTION 7

Assuming primary succession, list the following plant groups in order from early- successional to late-successional.

shade tolerant trees

shrubs

lichen

shade-intolerant trees

grasses/herbaceous plants

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QUESTION 8

Explain the intermediate disturbance hypothesis as it relates to successional stages and species diversity.

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QUESTION 9

Explain the theory of island biogeography. What factors determine the rate of immigration (new species establishment) and extinction?

Your response should be at least 200 words in length.

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