SimU - Population Growth Sections 1-4

Q1.8. All else being equal, which of the three graphs below represents a population with the lowest growth rate (λ)?

Look at image! (Quizlet needs to be set to "light mode" in order to see it clearly)

Q1.9. Based on the counts shown on the right, what was the growth rate, λ, for sockeye salmon in the Copper River in Alaska from 2009 to 2010?

1.302

Q1.10. Which of the following populations might be expected to grow geometrically? (Assume that interactions with other species can be ignored.)

A small population of finches that breeds once a year and lives on an island with abundant food

Q1.11. Threatened monarch butterflies are monitored by measuring the area occupied by overwintering butterflies in Mexico. According to data collected by World Wildlife Fund Mexico, monarch butterflies occupied 0.67 hectares one recent winter, and 1.13 hectares the following winter (one year later) 1. If the population is growing geometrically and grows at the same rate, how much area should the overwintering butterflies occupy one year after that?

1.905 hectares

Q1.12. The manager of a white-tailed deer population has surveyed the population for several years, counting the number of females. (Note: Often in wildlife management, only females are tracked.) She estimates & to be 1.31, and counted 255 females this year. If the deer population grows geometrically, what will be the size of the population of female deer 4 years from now?

751 female deer

Q2.7. When was the aphid population growing fastest?

When the population size was large.

Q2.8. In 2015, the global human population was estimated to be 7.3 billion. The global human population growth rate (2) is 1.011 per year. What is the per capita growth rate, λ, for the population?

0.011

Q2.9. What is the doubling time of the global human population?

63 years

Q2.10. If a water hyacinth population has an r value of 0, how will the population size change through time?

The population size would not change.

Q2.11. Species rarely grow exponentially, but do occasionally. Under which of the following conditions is this likely to happen?

All of the above

Q2.12. Bacteria grown in a lab experience what is called an 'exponential phase' of population growth. Suppose that, during this phase, a colony of Escherichia coli you are growing has a per capita growth rate, r, of 0.0347 per minute. If the size of your colony at the start of the exponential phase is 0.25 billion cells, then approximately how large will it be in 100 minutes?

8.03 billion cells

Q3.16. All else being equal, which of the three graphs below represents a population with the lowest intrinsic growth rate, r?

Look at image! (Make sure your Quizlet is in "light mode" to see it)

Q3.17. When a population is growing logistically, at what stage is the change in population size (N) over the change in time (x), i.e. dN/dt, the greatest?

When N is half the size of K

Q3.18. Recall the graph of sheep population size over time for Tasmania, displayed to the right. Assuming the data can be modeled using the logistic growth equation, what is the approximate carrying capacity for this population?

1,800,000 sheep

Q3.19. Think about what the terms density-dependent and density-independent mean. Which of the following statements about how density-dependent and density-independent factors affect population growth is TRUE?

The effect of most density-independent factors on population growth is not related to population density.

Q4.17. Deep sea vents are openings in the sea floor where hot water and nutrients spew out. As shown to the right, they have a rich community of species. However, individual vents often become plugged up, while new vents can appear in far flung parts of the ocean. You would expect to find that species who specialize at living around these vents are especially good at:

Dispersal

Q4.18. Approximately what patch occupancy, P, would you expect for a metapopulation at equilibrium with a colonization rate of 1.0 and an extinction rate of 0.6? (Hint: You can calculate the answer using a graph earlier in this section.)

0.4

Q4.19. Roads often decrease dispersal rates for animals and can divide patches in two. How might these consequences of building roads affect the survival of a metapopulation?

Roads should generally decrease metapopulation survival by reducing dispersal, which decreases recolonization of patches.