Question

The table below describes the number of tree species in a forest whose seeds are dispersed by large or small animals, and whether they are insect or wind pollinated. In the past, seed dispersers and pollinators were abundant in this forest. Now, there are very few large animal dispersers, but the number of small animal dispersers has not changed. There are also very few insect pollinators in this forest. Which one or more of the following inferences about trees in the forest can be drawn from these changes in seed dispersers and pollinators?

• A. Mortality of all trees in this forest will decrease in the future
• B. Mortality of a large number of trees in this forest will increase in the future
• C. Regeneration of all tree species in this forest will increase in the future
• D. Regeneration of a large number of tree species will decrease in future

Hint:

Consider the ecological roles of animal dispersers and pollinators in maintaining forest ecosystems, especially in planning conservation strategies.

Answer 1

The Correct Option is D

Step 1: Analyze the Impact of Reduced Large Animal Dispersers.
The table shows that 85 tree species rely on large animals for seed dispersal and insects for pollination. With fewer large animals and insect pollinators, these species are likely to face challenges in seed dispersal and pollination. 
Step 2: Consider the Impact of Reduced Insect Pollinators.
Insect-pollinated trees, which include both those dispersed by large and small animals (85 + 25), will also struggle to achieve successful pollination, affecting their reproductive success. 
Step 3: Draw Inferences on Tree Regeneration.
Given the dependencies described and the reductions in key dispersers and pollinators, it is reasonable to infer that the regeneration capacity of these tree species, particularly those dependent on large animals and insects, will decrease.