An adult oyster can filter up to 50 gallons of water a day, providing crucial ecosystem services by clarifying water and removing pollutants, including nitrogen. This is significant for marine ecosystems, as excessive nitrogen can trigger harmful algal blooms that deplete oxygen and create "dead zones" . Additionally, oyster reefs offer a complex three-dimensional habitat that supports hundreds of species .
Historically, massive oyster reef systems in New York Harbor served as natural defenses against storm damage by softening large waves, reducing flooding, and preventing erosion . These reefs were integral to the harbor's biodiversity and resilience, providing both ecological and protective benefits.