What would happen to successive trophic levels in the pyramid of energy if the rate of reproduction of phytoplanktons was slowed down? Suggest two factors which could cause such a reduction in phytoplankton reproduction.

Explanation

### Step-by-Step Solution:

1. **Understanding the Role of Phytoplankton**:
- Phytoplankton are microscopic plants that occupy the first trophic level in aquatic ecosystems. They are primary producers, meaning they convert sunlight into energy through photosynthesis.

2. **Impact of Slowed Reproduction**:
- If the rate of reproduction of phytoplankton slows down, their population will decrease. This reduction in phytoplankton will lead to a decrease in the net primary productivity, which is the amount of energy available to the next trophic levels.

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