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Chapter 36: Problem 30

Predict and explain the effects of human population on biodiversity many years in the future. a. Biodiversity will decline as human population increases because of habitat loss, increased pollution, and climate change. b. Biodiversity will decline as human population increases because of enhanced food supplies, medical advances, and development of renewable energy sources. c. Biodiversity will increase as human population increases because of habitat loss, increased pollution, and climate change. d. Biodiversity will increase as human population increases because of enhanced food supplies, medical advances, and development of renewable energy sources.

Short Answer

Expert verified
Option (a) is correct because biodiversity will decline due to habitat loss, pollution, and climate change as human population increases.

Step by step solution

01

- Analyze the question

The question asks to predict and explain the effects of human population on biodiversity in the future. Consider how human activities might impact biodiversity.
02

- Examine each option

Review options (a), (b), (c), and (d) carefully. Determine whether each option suggests that biodiversity will increase or decrease as human population increases.
03

- Evaluate habitat loss, pollution, and climate change

Understand that habitat loss, pollution, and climate change generally negatively impact biodiversity. Larger human populations often cause these issues to worsen. Therefore, options stating these factors align with a decline in biodiversity.
04

- Evaluate effects of enhanced food supplies, medical advances, and renewable energy

Consider whether enhanced food supplies, medical advances, and renewable energy sources positively or negatively affect biodiversity. Generally, while they improve human life quality, they do not directly result in increased biodiversity. Instead, increased human populations that use these advances still tend to diminish biodiversity through resource use and habitat disruption.
05

- Choose the correct option

Identify that option (a) correctly correlates the increase in human population with a decline in biodiversity due to habitat loss, increased pollution, and climate change.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Habitat Loss
Habitat loss occurs when natural environments are transformed for human use. As human populations grow, more land is converted for agriculture, urban development, and infrastructure. This reduces the available space for wildlife.
For example, the deforestation of rainforests for farmland destroys the homes of countless species. Without these habitats, animals and plants lose their homes and sources of food, leading to population declines.
Core impacts of habitat loss include:
  • Reduction in species diversity
  • Disruption of ecosystems
  • Increased vulnerability to predators and diseases
Effective conservation efforts must prioritize protecting and restoring habitats to mitigate these impacts.
Pollution
Pollution is the introduction of harmful substances into the environment. It can come from industrial activities, agricultural practices, and everyday human activities. As human populations increase, so does the amount of waste generated.
Key types of pollution affecting biodiversity include:
  • **Air pollution**: Emissions from cars and factories contribute to global warming and acid rain.
  • **Water pollution**: Chemicals and waste products dumped into rivers and oceans can kill marine life.
  • **Soil pollution**: Pesticides and heavy metals in the soil can make it toxic for plants and animals.
Pollution can poison organisms, disrupt reproductive systems, and damage entire ecosystems. Reducing pollution through regulations and sustainable practices can help protect biodiversity.
Climate Change
Climate change refers to long-term shifts in temperature and weather patterns, primarily caused by human activities such as burning fossil fuels and deforestation. As the climate changes, habitats can become inhospitable for some species.
Here are some primary effects of climate change on biodiversity:
  • **Temperature shifts**: Many species have specific temperature ranges they thrive in. Global warming can push these temperatures out of their range, leading to stress and mortality.
  • **Rising sea levels**: Coastal and island habitats can be submerged, displacing the species living there.
  • **Extreme weather**: Increased frequency of extreme weather events like hurricanes and droughts can destroy habitats and further stress wildlife.
By addressing the root causes of climate change, we can help stabilize the environment and protect biodiversity.
Biodiversity
Biodiversity refers to the variety of life forms found in different environments, from genes and species to ecosystems. It is crucial for maintaining ecosystem stability and providing resources for human survival.
Effects of declining biodiversity include:
  • **Loss of ecosystem services**: Healthy ecosystems provide services such as pollination, water purification, and climate regulation.
  • **Decreased resilience**: Ecosystems with high biodiversity are better able to withstand and recover from disruptions.
  • **Human impacts**: A decline in biodiversity can affect food security, health, and livelihoods.
Protecting biodiversity involves conserving habitats, reducing pollution, and mitigating climate change. Every action counts in preserving the planet's incredible variety of life.

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Most popular questions from this chapter

Humans began developing oil as an energy source in the early part of the twentieth century. Explain the relationship between this development and the human carrying capacity of Earth. a. Drilling for oil enabled humans to increase food production through the use of machinery, which increased the human carrying capacity of the Earth. b. Oil production allowed new transportation methods faster than methods using animals, which decreased the human carrying capacity of the Earth. c. Accessing oil as an energy source created increased greenhouse gas emissions, which increased the human carrying capacity of the Earth. d. Oil as an energy source enabled humans to enjoy more recreational activities, which decreased the human carrying capacity of the Earth.

Some animal behaviors can be modified by experience. Which of the following accurately predicts how an experiential factor is likely to affect an animal鈥檚 behavior? a. A species of salmon will migrate up the same river regardless of increases in predators that visit these waterways from one year to the next. b. Female elk that had difficult deliveries of calves will continue to mate with males in succeeding mating seasons. c. Bears that receive food from humans are later more likely to break into human habitations than bears that are not approached by humans. d. A bird raised from an egg isolated in a lab environment will give the same alarm call as birds of the same species raised in the wild.

A population is observed to have very large numbers of very young individuals, but very low numbers of sexually mature individuals. What hypothesis might are searcher propose about mortality patterns in this population and how would a researcher follow up to test their hypothesis? a. A researcher might propose the mortality rate of this species is very high during the developmental period after sexual maturity is reached. This hypothesis can be tested by constructing a life table and calculating mortality rates at different age intervals. b. A researcher might propose the mortality rate of this species is very high during the developmental period before sexual maturity is reached. This hypothesis can be tested by using the mark and recapture method and calculating population densities. c. A researcher might propose the mortality rate of this species is very high during the developmental period before sexual maturity is reached. This hypothesis can be tested by constructing a life table and calculating mortality rates at different age intervals. d. A researcher might propose the mortality rate of this species is very low during the developmental period before sexual maturity is reached. This hypothesis can be tested by constructing a quadrat and calculating mortality rates at different age intervals.

Describe how a researcher would best collect data in order to calculate mortality rates within a population. a. For various age groups, count the number of individuals that died and the number that survived within a defined time period. b. For various age groups, count the number of individuals that were born and the number that died within a defined time period. c. For each sex, count the number of individuals that were born and the number that survived within a defined time period. d. For each sex, count the number of individuals that died and the number that were born within a defined time period.

Fruit flies are found in many different areas in the world. Fruit flies that are resistant to cold temperatures tend to have decreased fecundity at early ages compared to flies that are not capable of surviving the cold. Explain a likely reason for why this set of traits is observed. (credit: Anthony Zera Publications) a. Flies having traits that traded early reproductive energy for greater storage of energy in their bodies were favored via natural selection because they survived the cold better than flies that did not have these traits. b. In cold conditions, flies have less need for reproduction than in warm conditions and so energy normally used for reproduction is diverted to other survival functions. c. Flies respond to weather conditions to shift their energy resources to either storage in their bodies in the cold or to reproduction when conditions become warm again. d. All fruit flies have the same genetic makeup, but express different patterns of genes under different conditions, which results in expression of certain genes for cold conditions and others for warm conditions.
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