Human Impact on Ecosystems

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What is eutrophication?

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Eutrophication is the process by which water bodies become overly enriched with nutrients, leading to excessive growth of algae and depletion of oxygen, which can harm aquatic life.

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What is the main cause of eutrophication in aquatic ecosystems?

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The main cause of eutrophication is the increase in nutrient runoff, particularly from fertilizers used in agriculture, especially after heavy rains.

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How do invasive species affect native ecosystems?

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Invasive species can damage native ecosystems by competing with native species for resources, altering plant communities, and reducing biodiversity.

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What are the main human activities that lead to loss of biodiversity?

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Habitat destruction, pollution, and over-fishing/over-hunting are the main human activities that contribute to the loss of biodiversity.

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What is a keystone species?

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A keystone species is a species that has a disproportionately large effect on its environment relative to its abundance, playing a critical role in maintaining the structure of an ecological community.

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What happens when a keystone species is removed from an ecosystem?

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The removal of a keystone species can lead to significant changes in the ecosystem, often resulting in instability and loss of biodiversity.

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What does it mean that ecosystems are interconnected?

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Ecosystems are interconnected means that changes in one ecosystem can affect others, as species and resources move between them, and human actions can have far-reaching impacts.

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What is habitat destruction?

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Habitat destruction is the process in which natural habitats are altered or destroyed, often due to human activities like urban development, agriculture, and deforestation.

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What role does pollution play in ecosystems?

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Pollution can degrade ecosystems by introducing harmful substances that can harm wildlife, disrupt food chains, and reduce biodiversity.

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What is the impact of over-fishing on marine ecosystems?

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Over-fishing can lead to the depletion of fish populations, disrupt food webs, and negatively affect the overall health of marine ecosystems.