Question

In an assemblage of coexisting wild cat species, the size of canine teeth was found to be strikingly different between these species. Which one or more of the following statements explain(s) this observation?

• A. Differences in the size of canine teeth were driven by the size of prey captured by the different species.
• B. Differences in the size of canine teeth are an example of divergent evolution.
• C. Differences in the size of canine teeth are an example of convergent evolution
• D. Differences in the size of canine teeth were driven by past competition

Hint:

Use the “alone” treatment to diagnose abiotic limits and the “together” treatment to diagnose biotic interactions; compare the same species and zone across these two panels to attribute causes.

Answer 1

The Correct Option is A, B, D

Step 1: Interpret observation.
The cats coexist in the same ecosystem, yet show very different canine sizes. This suggests resource partitioning through morphological divergence, which reduces competition.

Step 2: Evaluate options.
(A) \emph{Prey size drives canine size.}
Yes — larger prey requires stronger, longer canines; smaller prey can be subdued with shorter canines. This is a functional ecological adaptation. (B) \emph{Divergent evolution.}
Yes — these species diverged morphologically to exploit different prey niches. This is classic divergent evolution, where related species evolve different traits to minimize competition. (C) \emph{Convergent evolution.}
No — convergent evolution is when unrelated species evolve similar traits due to similar selective pressures. Here, the cats evolved \emph{different} traits, so this is divergence, not convergence. (D) \emph{Driven by past competition.}
Yes — character displacement often results from interspecific competition, pushing species to evolve distinct morphologies to reduce niche overlap. Final Answer:\quad \(\boxed{\text{(A), (B), and (D)}}\)