Final answer:
Human actions such as habitat destruction, overharvesting, and water pollution can have negative effects on aquatic ecosystems.
Step-by-step explanation:
Human actions can have significant impacts on aquatic ecosystems. Three examples of how human actions affect aquatic ecosystems include:
- Habitat destruction: Activities such as land development, damming, and water removal can modify rivers and streams, disrupting the natural flow of water and leading to declines in populations of fish, amphibians, and freshwater clams.
- Overharvesting: Unsustainable fishing practices, driven by economic and political factors, can deplete fish populations and cause fishery collapses, threatening marine and freshwater species.
- Water pollution: Pollution from human activities, such as sewage disposal and agricultural runoff, can introduce harmful substances and pollutants into water bodies, affecting the quality of aquatic life and impacting the entire food web.