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Exam 19: Population and Community Ecology

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Question 21

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What can one infer from a relatively linear survivorship curve, and what organism generally exhibits this kind of survivorship curve?

A) the mortality rate is roughly uniform across the lifespan of this organism; birds
B) the mortality rate is higher for older members of this population; humans
C) the mortality rate is higher for younger members of this population; oak trees

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Question 22

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The American Bald Eagle was on the Endangered Species list for many years, the bird's numbers have rebounded considerably.Study of these birds occurs at what level?

A) ecosystem ecology
B) population ecology
C) community ecology

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Question 23

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Mark and recapture is a way that ecologists can estimate the size of a population in a community or ecosystem.A researcher team recently captured, tagged, and released 50 crows in one geographic region.Then over the next few months, they captured 200 crows, of which 5% were tagged from before.They conclude that the population of crows in this region is roughly_________.(Outcome #7a)

Designating a species a K-selected species means that the species likely exhibits which set of characteristics?

If a population exhibits a death rate that exceeds its birth rate, it is likely to ________.(Outcome #7b)

With a typical predator and prey, when the prey population increases,

The principle that states that two different species cannot occupy the same niche in a given habitat is called what?

A population-birds, for example-that experiences a roughly uniform mortality rate across its lifespan will typically exhibit what type of survivorship curve?