- Explain why biodiversity is important.
- Explain the threats to biodiversity.
- Create a system diagram for the causes of deforestation in the Amazon.
- Biodiversity means that there are more forms of life we can use. But also, protecting biodiversity is important for ecosystem functioning. An ecosystem with biodiversity is more resilient, so we can take greater advantage of it. If we want to use ecosystems for our benefit, they need to function properly. Ecosystems contain complex relationships between organisms. Losing a species might destroy this order, as illustrated by the example of the honeybees.
- Humans may decrease biodiversity by destroying habitats, e.g. clearing of rainforest for agriculture. The rainforest soil is typically not fertile and so not conducive to habitation. Another threat to biodiversity is introduction of invasive species. When a new species enters an ecosystem, it might disrupt the prior order. For example, it may introduce unfamiliar diseases that wipe out some species. Another possibility is that the new species may prey on certain species and drive them to extirpation. This is related to overharvesting. Even if the prey is not extirpated, there may be a permanent decrease in biodiversity by the ecosystem changing to a new stable state. Pollution makes it difficult or impossible for life to flourish. Pollution doesn’t necessarily consist of synthetic chemicals such a plastics; it can also be naturally occurring chemicals present in too high concentrations. Even chemicals released into the environment at initially low concentrations can end up in high concentrations in some organisms via bioaccumulation. Finally, a growing human population can threaten biodiversity by e.g. habitat loss or pollution.