Question

Species which are threat to biodiversity are ?

• A. Keystone species
• B. Invasive species
• C. Flagship species
• D. Indicator species

Hint:

In fisheries, exotic weeds like Water Hyacinth or predatory fishes like African Catfish (*Clarias gariepinus*) are classic examples of invasive species that threaten native aquatic biodiversity.

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
Ecosystems are shaped by various types of species.
Some species are beneficial or essential for maintaining ecological balance, while others can cause harm when introduced into non-native environments.

Step 2: Detailed Explanation:
Let us analyze the terms provided in the options:
- Keystone species: These are species that have a disproportionately large effect on their natural environment relative to their abundance. They are crucial for maintaining ecosystem structure and biodiversity.
- Invasive species: These are non-native (exotic) organisms that, when introduced into a new ecosystem, propagate rapidly, compete with native species for food and habitat, and can cause significant ecological or economic harm. They are a major threat to native biodiversity.
- Flagship species: These are iconic or charismatic species chosen to raise support and awareness for conservation efforts (e.g., Tiger, Giant Panda).
- Indicator species: These are organisms whose presence, absence, or health reflects the environmental conditions of an ecosystem (e.g., lichens reflecting air quality).
Therefore, invasive species are the group that poses a direct threat to native biodiversity.

Step 4: Final Answer:
The species that represent a threat to biodiversity are invasive species.