♻️ap environmental science review

Algal Blooms

Written by the Fiveable Content Team • Last updated September 2025
Verified for the 2026 exam
Verified for the 2026 examWritten by the Fiveable Content Team • Last updated September 2025

Definition

Algal blooms are rapid and excessive growths of algae in bodies of water, caused by an excess of nutrients like nitrogen and phosphorus. These blooms can deplete oxygen levels in the water, leading to harmful effects on aquatic life.