To solve the given question, which is about trophic interactions in an ecological community, we need to logically deduce the impact of pond fish presence on plant fitness based on the given food chain:
- Identify the Trophic Interactions:
- Dragonflies eat plant pollinators. This means that dragonflies can reduce the pollinator population, thereby potentially reducing plant pollination and fitness.
- Fish eat dragonfly larvae. This means that in ponds with fish, the dragonfly population is likely controlled or reduced because fish prey on their larvae.
- Impact on Plant Fitness:
- In ponds without fish, dragonflies likely have a higher population, thus consuming more pollinators, leading to reduced pollination and therefore, possibly lower plant fitness.
- Conversely, in ponds with fish, the dragonfly population is controlled, allowing for a greater presence of pollinators, which can enhance plant pollination and thus increase plant fitness.
- Conclusion:
Based on this analysis, plants growing near ponds with fish are likely to have higher fitness due to the reduced dragonfly population, which allows for more effective pollination. Hence, the correct answer is that plants growing near ponds with fish have higher fitness.
This analysis is grounded on the concept of a trophic cascade, where the presence of a predator (fish) has indirect positive effects on plant fitness by managing intermediate consumers (dragonfly larvae).
Important Questions from Community interactions
- Certain species of ibex and weevils depend on the same food source. A study finds that the removal of ibex results in an increase in the number of weevils, but the removal of weevils does not affect the ibex. Which one of the following options best describes this interaction?
- Fungus S infects elm trees and fungus T infects chestnut trees, and both kill their hosts within a year of infection. A forest with equal density of elm and chestnut trees is colonized by both pathogenic fungi. A 100 years later, the elm tree population has declined and the chestnut trees have become extinct. Which one of the following mechanisms would NOT contribute to this outcome?
- Which one of the following is a result of antagonistic coevolution?
- Observations of algal species showed that their diversity was higher in pools where there were grazing snails compared to pools without snails. Which one of the following statements best explains this result?
- Which one of the following ecological processes best explains the observation thatseedling establishment increases with distance from the parent tree in a forest?
