Question

The idea that no two species within an ecosystem can occupy the exact same niche
niche decay
competitive exclusion
niche overlap
niche differentiation

Answer 1

The idea that no two species within an ecosystem can occupy the exact same niche is known as the **competitive exclusion principle**. This principle states that if two species were to compete for the exact same resources (niche) in the same environment, one species would outcompete the other, leading to the extinction of one species or the other.

The other options you mentioned refer to different concepts related to ecological niches:

- **Niche decay**: This term generally refers to a reduction or loss of ecological roles or niches over time, often due to environmental changes or species extinction.

- **Niche overlap**: This occurs when two species share some of the same resources or niches, which can lead to competition between them.

- **Niche differentiation**: This process, also known as resource partitioning, happens when species evolve to utilize different resources or occupy different niches, reducing competition and allowing them to coexist.

So, in summary, the correct term for your question is **competitive exclusion**.