Ecosystem stability 13D Human impactDOL

A large forested region is cleared for urban development, drastically reducing the number of native flowering plants. Based on the graph, how does habitat destruction affect pollinators and plant biodiversity?

• As bee populations decline, flowering plant populations also decrease, while invasive species increase.

• Flowering plants increase due to fewer bees pollinating them, and invasive species remain unchanged.

• Habitat destruction has no significant impact on pollinators since they can migrate to new areas.

• Bees become extinct immediately, causing all plant species to vanish within a few years.

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A coastal region is experiencing a rise in sea levels due to the melting of polar ice caps. The affected area is home to diverse marine life, including coral reefs, seagrasses, and various fish species. Which of the following is a possible explanation of how this environmental change can influence the stability of the coastal ecosystem? Select TWO that apply.

• A. Rising sea levels may lead to increased sedimentation, affecting coral reef health.

• B. Higher sea levels can enhance the resilience of seagrasses to changing environmental conditions.

• C. Increased water depth may promote the growth of coral reefs, decreasing biodiversity.

• D. Rising sea levels can disrupt the balance of salinity, negatively impacting marine organisms.

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When forests are cut down to clear space for fields, roads, and power lines, the entire ecosystem is affected. The image shows an ecosystem that recently was disrupted by deforestation. Which of these statements describes a possible consequence of deforestation on this ecosystem? Select TWO that apply.

• A. Water in streams and rivers can become polluted and impact aquatic organisms, therefore decreasing ecosystem stability.

• B. Animals find food more easily in a smaller environment, therefore increasing ecosystem stability.

• C. Competition increases for resources, therefore maintaining ecosystem stability.

• D. Invasive species have an opportunity to become established in the disrupted area, therefore decreasing ecosystem stability.

• E. A natural ecosystem is enhanced due to deforestation, thereby increasing ecosystem stability.

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Based on the food web, how would a significant decrease in the sea otter population due to an oil spill most likely affect this ecosystem?

• A. The sea urchin population would increase causing the kelp population to decrease.

• B. The fish population would increase in response to the changes in the mussel population.

• C. The mussel population would increase in response to the changes in the algae population.

• D. The killer whale population would increase causing the fish population to decrease.

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A rural community depends on Lake Eldoria for water, fishing, and farming. Over the years, excessive water use, deforestation around the lake, and industrial pollution have led to a drastic decline in water levels and fish populations. Explain how human activity has disrupted the lake’s ecosystem stability. What might happen if these activities continue? What solutions could the community implement to restore balance?

• Human activity has led to a decline in water levels and fish populations, disrupting the lake's ecosystem stability.

• If these activities continue, the lake may become unable to support the community's needs.

• The community could implement sustainable water use, reforestation, and pollution control to restore balance.

• All of the above.

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