What can be a result of extreme weather events on pest populations?

• A. Increase in pest resilience
• B. Mass mortality and population shifts
• C. Uniform pest removal
• D. Stable pest populations

Answer: (B)

Extreme weather events can significantly impact pest populations by causing mass mortality and shifts in their distributions. When severe weather conditions, such as heavy rainfall, extreme heat, or drought occur, they can directly affect the survival rates of various pests. For instance, excessive rain can lead to flooding, which can drown pests or disrupt their breeding environments. Similarly, extreme temperatures can be lethal to certain species, leading to reduced numbers.

Moreover, these disturbances can alter the habitats that pests depend on for food and shelter. As their environments change, some pests may migrate to new areas where conditions are more favorable, resulting in population shifts. This can also lead to changes in the interactions among different pest species and their natural predators, further influencing population dynamics.

In contrast, uniform pest removal is unlikely because extreme weather typically does not eradicate all individuals of a species uniformly; the outcomes vary depending on the specific conditions and the resilience of the pest species. Similarly, while some pests may develop increased resilience to environmental changes over time, this is generally a longer-term evolutionary response rather than an immediate outcome of extreme weather events. Stable populations are also typically disrupted by such events, making option B the most accurate reflection of what can occur.