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Describe the factors that affect population size, density, and growth rates. What are the different models of growth rates that were discussed in this unit? How does age structure and economic development affect human population growth rate? What are examples of long-term consequences if the human population growth rate does not change?

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Lelia Lubowitz
Lelia LubowitzLv2
21 Jun 2018

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Related questions

Populations (Ecology)

•What’s the difference between a cohort and static life table and what are the difficulties with each? Be able to interpret data in a life table.

• Be able to draw or interpret survivorship curves for different populations. What are the differences between the three types?

• Why does population age structure matter?

• What happened to Pablo Escobar’s hippos? What are some possible consequences? What might happen in the future?

• What are exponential and geometric growth?

• Be able to graph population size over time for a given growth rate (like figure 10.11).

• What’s the difference between density dependent and density independent factors to limit growth? Give examples. Which one regulates population size? Why?

• What is logistic growth? Explain how the growth rate changes at different population sizes. Be able to compare logistic and exponential growth.

• What are the four factors that affect population size over time?

• What are population cycles? What are some of the factors that drive them?

• What is delayed density dependence and why does delayed density dependence cause populations to fluctuate? What factors affect these fluctuations? Be able to draw typical population fluctuation figures like fig. 11.10.

• What’s the difference between stabilizing and destabilizing feedbacks? How do delayed feedbacks affect a stabilizing feedback?

• How does population size affect the likelihood of extinction?

• What is the Allee effect? How does it affect growth rate at different population densities? Draw a figure illustrating this.

Question :Mutations that cause sickness and/or death after reproduction has occurred:

Question 1

options: can be passed on to future generations.

will not be passed on to future generations. are unlikely to occur.

are only passed on to future generations in species that have short life spans.

Question 2

In a population exhibiting logistic growth, what happens when the carrying capacity is exceeded?

Question 2 options:

The growth rate becomes zero until the population is back within the carrying capacity.

The growth rate becomes negative until the population is back within the carrying capacity.

The population crashes and becomes extinct.

The population's fertility drops to zero.

Question 3 How does exponential growth differ from logistic growth?

Question 3 options:

Logistic growth models take the population's age structure into account.

Long-term exponential growth is more commonly observed than long-term logistic growth in nature.

The logistic model of growth incorporates environmental limitations on population size.

Logistic growth generally comes with infinite expansion.

Question 4 Density-dependent and density-independent growth factors influence the size of a population by causing changes in the:

Question 4 options:

death rate and pattern of dispersion.

birth rate and death rate.

age structure and birth rate.

carrying capacity and age structure.

Question 5 The life history of an organism does not include the organism's

Question 5 options:

reproduction

All of these are included in an organism's life history.

death

birth

1. Ifan endangered species such as the Santa Ana River wooly star wereto become extinct, what effects might this have on otherspecies?

2. Whatdo J- and S- shaped population curves indicate about the life spanof an organism?

3. Doescompetitive exclusion limit the diversity within a givencommunity?

4. Whyare field studies, such as the monitoring of owls, important in thestudy of ecology?

5. Howdoes mutualism differ from commensalism?

6. Whateffect did the agricultural revolution have on the growth of thehuman population?

7. Whatdoes the demographic transition model say about the birth and deathrates?

8. Inyour opinion, is a zero population growth rate possible?

9. Whatcritical factors could affect the age structure diagram?

10. Do youbelieve that the human population can stabilize without widespreadstarvation, war or epidemics?

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