You are watching a documentary on television about grizzly bears in North America. The narrator is speaking over a clip of two cubs and their mother walking along a riverbank in a heavily wooded forest. She says that grizzly bear populations are rising for the first time in several decades even though deforestation is still a growing problem in North America. Which of the following could be a possible factor for the increase in the grizzly population? Loss of habitat Reduction of resources Increased industrialization Higher birth rate over death rate

You are watching a documentary on television about grizzly bears in North America. The narrator is speaking over a clip of two cubs and their mother walking along a riverbank in a heavily wooded forest. She says that grizzly bear populations are rising for the first time in several decades even though deforestation is still a growing problem in North America. Which of the following could be a possible factor for the increase in the grizzly population? Loss of habitat Reduction of resources Increased industrialization Higher birth rate over death rate

Concepts of Biology

1st Edition

ISBN:9781938168116

Author:Samantha Fowler, Rebecca Roush, James Wise

Publisher:Samantha Fowler, Rebecca Roush, James Wise

Chapter19: Population And Community Ecology

Section: Chapter Questions

Problem 2ACQ: Figure 19.6 If the major food source of seals declines due to pollution or overfishing, which of the...

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Figure 45.16 Age structure diagrams for rapidly growing, slow growing, and stable populations are shown in stages 1 through 3. What type of population change do you think stage 4 represents?
Figure 19.6 If the major food source of seals declines due to pollution or overfishing, which of the following would likely occur? a. The carrying capacity of seals would decrease, as would the seal population. b. The carrying capacity of seals would decrease, but the seal population would remain the same. c. The number of seal deaths would increase, but the number of births would also increase, so the population size would remain the same. d. The carrying capacity of seals would remain the same, but the population of seals would decrease.
Figure 19.2 As this graph shows, population density typically decreases with increasing body size. Why do you think this is the case?
Which of the following is a factor that would decrease the size of a population? A. Death rate is higher than the birth rate B. Abundant food supply C. Immigration D. Birth rate is higher than the death rate
At the edge of the Arctic Circle, owls prey on field mice. Occasionally, in a litter of white field mice, a brown mouse appears. Because of greenhouse warming, the snow melts, changing the environment to shades of brown. What is most likely true regarding the brown mice before the greenhouse warming? The brown mice population was large in number. The brown mice population was small in number. The fur color of mice changed to white because they needed to survive. There were no brown mice born before greenhouse warming.
How does the study of population ecology help us understand why some populations grow, some remain stable and others decline? The human population has grown as we have increased our global carrying capacity. In your opinion, can the global carrying capacity continue to increase/ Explain your answer? Why has human population growth, which increased exponentially for centuries, started to decline in the past few decades?
What factors led to the dramatic decrease in population growth rates in Kerala, India?Compare the case of Kerala to India’s national population control program put intoplace in the 1970s.
Choose the statement that is most likely made by an environmentalist rather than by an environmental scientist. "On average, 52 animal species move one step closer to extinction each year because of overpopulation and habitat destruction.” “Human population growth is a current environmental issue, as is climate change.” “When the number of existing humans exceeds the carrying capacity of the planet, we have reached the state of overpopulation.” “Citizens must take matters into their own hands and start having fewer children to reduce the world’s population, starting now.”
An ecologist studied how many kangaroo rats could be supported in two different habitats, a high‐quality habitat and a low‐quality habitat. The ecologist estimated the per capita benefit in each habitat, or patch, as the number of individuals increased. How many individuals must move to the high‐quality patch before an individual moves to the low‑quality patch? Find Number of individuals? Number of individuals High-quality patch per capita benefit Low-quality patch per capita benefit 1 10.0 5.0 2 7.9 4.3 3 6.5 3.7 4 5.4 3.2 5 4.5 2.9 6 3.9 2.6 7 3.4 2.4 8 3.0 2.2 9 2.7 2.0 10 2.4 1.9
The island of Guam in the South Pacific had no natural predators until the early 1950s, when the brown tree snake was accidentally introduced by either ships or aircraft shortly after the Second World War. Scientists studying the effects of this invasive species surveyed five different native bird species in an area of northern Guam that the brown snake had recently invaded. The graph shows the population data of the five different native bird species from 1976 to 1998. Which of the following best describes the data and explains the effect of the arrival of the brown tree snake on Guam’s native bird species?
The graph shows the worldwide human population from 1950 to 2050. Data for the future years are predictions. According to the ideas of Thomas Malthus, what are the predicted changes to the human population after 2050? A. The population would continue to increase at the same rate, due to constant food supplies. B. The population would increase more rapidly, due to advances in technology. C. Eventually the population would stop increasing or would decrease, due to lack of food and living space. D. Eventually the population would decrease to zero, because of war, famine, or disease.
A biologist determines the growth rate of a population of 198 frogs in a marsh near Beaverhill Lake, Alberta, to evaluate the quality of the environment. The researcher finds that, in one year, 34 were born, 86 died, 12 migrated into the marsh, and there was no emigration. a. frogs are considered an indicator species for the quality of the environment. Determine whether the growth rate of this population in one year is a cause for concern. if so, what might the concerns be?