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Question #46040
The Question
An ecologist is modeling biodiversity loss in a highly fragmented tropical rainforest by integrating Alexander von Humboldt’s Species-Area relationship (log S = log C + Z log A) with Paul Ehrlich’s Rivet Popper hypothesis. Which of the following statements regarding the ecosystem's stability and species loss is INCORRECT?
Options
- A.
The equation predicts the numerical decline in species richness (S) as area (A) shrinks, but cannot quantify the non-linear functional collapse if a 'rivet on the wing' is lost.
- B.
A steeper slope (Z value > 1.0) indicates a rapid decline in species richness, which stochastically increases the risk of losing keystone species and functional redundancy.
- C.
According to the Rivet Popper model, the initial loss of a few 'rivets' (passenger species) due to fragmentation will immediately cause a disproportionate collapse of ecosystem functioning.
- D.
While the Z value treats all species equally in its mathematical calculation, the ecological impact of species extirpation depends heavily on their specific functional roles within the community.
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Correct Answer
Step-by-Step Solution
Explanation
How the Examiner Thinks
Regulatory_Failure
Understand how NOT, EXCEPT, and logical constraints are used to manipulate exam results.
Concepts Behind This Question
Z-value in Large Areas|Evil Quartet Drivers|Species-Area Relationship
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Students often assume that any loss of biodiversity immediately destabilizes the ecosystem, missing the nuance of 'functional redundancy' implied in the early stages of the Rivet Popper hypothesis.
The trap relies on the student failing to distinguish between the mathematical equality of species in Humboldt's equation (where every species is just a +1 to 'S') and the functional inequality of species in Ehrlich's analogy (where a wing rivet is vastly more important than a seat rivet).
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Biodiversity and Conservation - Class 12 |
| Concept | Species-Area Relationship |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |