Which of the following is least likely to be influenced by a single disturbance to an ecosystem?

• A. The amount of annual precipitation.
• B. The abundance/dispersal of vegetation.
• C. The abundance/dispersal of animals.
• D. Cleanliness of water.

Answer: (A)

Verified step by step guidance

1. Understand the concept of an ecosystem disturbance: Ecosystem disturbances are events that change the structure or function of an ecosystem. These can be natural, like fires or storms, or human-induced, like pollution or deforestation.
2. Consider the factors listed in the problem: The options given are annual precipitation, vegetation abundance/dispersal, animal abundance/dispersal, and water cleanliness.
3. Evaluate the impact of disturbances on each factor: Disturbances can directly affect vegetation and animal populations by altering their habitats or food sources. Water cleanliness can be impacted by pollutants or changes in water flow.
4. Analyze the factor least likely to be influenced: Annual precipitation is a climatic factor that is generally stable over time and not directly affected by localized disturbances. It is influenced by larger atmospheric conditions rather than specific ecosystem events.
5. Conclude which factor is least likely to be influenced: Based on the analysis, annual precipitation is the factor least likely to be influenced by a single disturbance, as it is governed by broader climatic patterns.