Ruth Puddefoot
December 2, 2025

Sharks: The Ecosystem Engineers

By Ruth Puddefoot

Sharks are often unfairly cast as the villains of the sea, but their role in marine ecosystems is both complex and crucial. As apex predators, they play a vital role in maintaining the health and balance of our oceans.


Here are a few key facts about why sharks are considered “ecosystem engineers,” essential to the health of our reefs and climate, particularly in the Great Barrier Reef:


   • Sharks regulate reef ecosystems by controlling predator and prey populations. Without them, biodiversity and food chains collapse. The Great Barrier Reef relies on species like white-tip and black-tip sharks to maintain this balance.

   • Sharks control fish populations, promoting diversity and balancing the food web. Without them, overgrazing and over-predation would destabiliase reefs, encouraging algae and bacteria growth that corals can’t compete with.
Pretty jawesome huh?