Question

Identify a proper terminology for a species which is not seen in large abundance in a natural habitat; however, it may form a significant element in hosting and feeding a variety of organisms in the habitat.

• A. Flagship species
• B. Umbrella species
• C. Threatened species
• D. Keystone species

Hint:

Think of the "keystone" in an architectural arch.
Removing it causes the entire structure to collapse, illustrating the crucial role of these species.

Answer 1

The Correct Option is D

Step 1: Understanding the Concept:
This ecological concept concerns the functional influence of specific organisms in biological communities.
Certain species exert major controls over community structure that are disproportionately larger than their total population or biomass.

Step 2: Detailed Explanation:
Let us evaluate the specific definitions of each biological term:
1. Flagship species:
These are charismatic species selected to serve as public symbols for conservation programs.
Examples include the Giant Panda and the Bengal Tiger.
Their role is defined by public appeal rather than direct ecological hosting or feeding.
2. Umbrella species:
These are species with extensive geographical habitat requirements.
Conserving their natural range indirectly protects numerous other species sharing that habitat.
Their definition is based primarily on spatial scale.
3. Threatened species:
This is a conservation designation assigned by the IUCN indicating a high risk of extinction.
It does not define a specific trophic or structural role within a community.
4. Keystone species:
Coined by Robert T. Paine, this term describes a species whose presence maintains the structural integrity of an ecosystem.
Even at very low abundance, their elimination causes a massive collapse in community dynamics.
For instance, certain wild fig trees (*Ficus* species) serve as crucial keystone resources in tropical forests.
They provide essential nourishment to frugivorous birds and mammals during dry seasons when other foods are scarce.

Step 3: Final Answer:
The ecological description aligns precisely with the definition of a Keystone species.
Thus, Option (D) is correct.