Podcast
Questions and Answers
Which disturbance would result in primary succession? (Select all that apply)
Which disturbance would result in primary succession? (Select all that apply)
- The effect of a large herd of elephants on the grasses and shrubs in an area
- Harvesting wheat by using a combine harvester at the end of the growing season
- Controlled burning to stimulate the growth of forest trees such as sequoia
- The formation of Surtsey, a volcanic island off of the southern coast of Iceland (correct)
According to the pie chart, which cause results in the most extinctions?
According to the pie chart, which cause results in the most extinctions?
- Habitat loss
- Hunting and poaching
- Other
- Introduced species (correct)
What is most likely to result immediately after a rainforest in Brazil is clear-cut?
What is most likely to result immediately after a rainforest in Brazil is clear-cut?
- Increased biodiversity
- Secondary succession (correct)
- Primary succession
- A climax community
Which type of diversity is being lost as the population of rhinoceroses becomes very small?
Which type of diversity is being lost as the population of rhinoceroses becomes very small?
How are rhinoceroses classified under the Endangered Species Act?
How are rhinoceroses classified under the Endangered Species Act?
Which factors involving the activities of people are a threat to biodiversity?
Which factors involving the activities of people are a threat to biodiversity?
Which statement best describes ecological succession?
Which statement best describes ecological succession?
What is the role of a pioneer species in primary succession?
What is the role of a pioneer species in primary succession?
Which bar graph best represents the provided data?
Which bar graph best represents the provided data?
Which type of process first occurred in the ecosystem around Mount St. Helens after it erupted?
Which type of process first occurred in the ecosystem around Mount St. Helens after it erupted?
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Study Notes
Succession and Extinction
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Primary succession occurs in an environment devoid of soil and life, exemplified by the formation of Surtsey, a volcanic island in Iceland.
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Introduced species are the leading cause of extinctions according to provided data.
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After the clear-cutting of a rainforest, secondary succession is likely to follow, allowing the ecosystem to rebound.
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Poaching of rhinoceroses at rates of two or three per week in Africa and Asia leads to a significant loss in genetic diversity as their population dwindles.
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Rhinoceroses are classified as endangered under the Endangered Species Act due to their critically low numbers approaching extinction.
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Biodiversity is threatened by human activities, particularly through poaching and habitat loss, which devastate ecosystems.
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Ecological succession is a natural process that occurs after a disturbance in an ecosystem.
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Pioneer species play a crucial role in primary succession by producing soil, paving the way for other plants to grow.
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A bar graph showed that introduced species account for 39% of total extinctions, habitat loss for 36%, hunting and poaching for 23%, and other causes for 2%.
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The volcanic eruption of Mount St. Helens in 1980 initiated primary succession as the ecosystem began to recover and rebuild from the disturbance.
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