Question

Which of the following is not part of the growing taxonomic homogenization of Earth's biota?

1) Increases in the number of native specialist species
2) Decreases in the distribution of native specialist species
3) Increases in the number of native generalist species
4) Spread of introduced species

Answer 1

The correct answer is 'Increases in the number of native specialist species' as it does not contribute to taxonomic homogenization but rather enhances local biodiversity, which is contrary to the concept of taxonomic homogenization.

Option 1 is the correct answer.

Step-by-step explanation:

The growing taxonomic homogenization of Earth's biota refers to the increasing similarity of species composition in different areas, primarily due to human activities like trade and movement, which introduce non-native species to new environments. Here are the options, analyzed:

1. Increases in the number of native specialist species - This is NOT part of taxonomic homogenization. Native specialist species have a limited distribution and their increase would lead to greater biodiversity, not homogenization.
2. Decreases in the distribution of native specialist species - This IS part of taxonomic homogenization, as it leads to a reduction in the distinctiveness of the local fauna.
3. Increases in the number of native generalist species - This CAN be part of taxonomic homogenization, especially if these generalist species start to dominate multiple regions.
4. Spread of introduced species - This is a PRIMARY DRIVER of taxonomic homogenization as these species can outcompete native species and spread widely, making regional biotas more similar.

Therefore, the correct answer is the Increases in the number of native specialist species since it does not contribute to taxonomic homogenization but rather enhances local biodiversity.