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How do forest clearing and agricultural expansion affect biodiversity?
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ecological disturbance
Aerial view of the remains of trees on a hillside after a forest fire.
Forest clearing and agricultural expansion are primary drivers of habitat loss, which is the leading cause of the global decline in biodiversity. These human-driven disturbances affect ecosystems in several critical ways:12
- Habitat Destruction: Converting forests into croplands or grazing areas removes the vegetation that provides essential food and shelter. This forces native species to migrate or face extinction, as the transformed environment can no longer support them.1
- Habitat Fragmentation: This process divides large, contiguous ecosystems into smaller, isolated patches. Fragmentation hinders reproduction by making it difficult for individuals to find mates and increases the risk of predation or death as species attempt to move through the surrounding, often hostile, matrix.13
- Ecosystem Degradation: Agricultural activities often introduce pollutants, such as nitrogen fertilizers, which can lead to eutrophication in nearby water bodies, reducing oxygen levels and harming aquatic life. Furthermore, cleared areas provide corridors for invasive species to enter and outcompete native populations for resources.12
Ultimately, these activities reduce the resilience of ecosystems, pushing many plant and animal species toward extinction.32