Suppose you are studying two small lakes (lake 1 and lake 2) and how they change over time. A nearby farm accidentally spills fertilizer into lake 1. Around the same time, a non-native fish-eating turtle is introduced into lake 2. The ecosystems of both lakes are affected by these changes. What processes most likely explain how the lakes were affected?
A) Bottom-up control in lake 1; top-down control in lake 2
B) Top-down control in lake 1; bottom-up control in lake 2
C) Top-down control in both lakes
D) Bottom-up control in both lakes

Question

Quizplus · Accepted Answer

The fertilizer in lake 1 likely causes a bottom-up effect by increasing nutrient levels, leading to increased plant and algae growth. The introduction of a fish-eating turtle in lake 2 likely causes a top-down effect by altering the predator-prey dynamics.

Suppose You Are Studying Two Small Lakes (Lake 1 and Lake