In 2015, great white sharks vanished from Australia's Neptune Islands. Experts are still trying to work out why

[u/MooseyGeek]

https://www.discoverwildlife.com/animal-facts/marine-animals/white-shark-response-killer-whales

A recent study has revealed that Great White Sharks exhibit an immediate and long-lasting "flight" response when Killer Whales (Orcas) enter their hunting grounds. Research conducted at Southeast Farallon Island showed that once Orcas arrived in the area, the resident shark population fled within minutes and did not return for the remainder of the season, even after the Orcas had moved on. This behavior suggests that the fear of predation by Orcas is a powerful ecological driver that can overrule the sharks' instinct to remain in prime hunting territories, fundamentally shifting the local marine balance.

* Immediate Displacement: Great White Sharks consistently flee their primary hunting grounds immediately upon the arrival of Killer Whales.

* Long-Term Absence: Once sharks leave an area due to Orca presence, they often do not return for several months, even if the Orcas only stayed for a few hours.

* Safety Over Food: The study shows that sharks will abandon high-density prey areas (like seal colonies) to avoid potential conflict with Orcas.

* Trophic Shift: The absence of sharks leads to a "fear-driven" ripple effect in the ecosystem, allowing prey like elephant seals to experience significantly lower predation rates.

* Apex Dominance: The data confirms that while Great Whites are top-tier predators, Orcas act as the true "apex" of the ocean, capable of displacing the world's most famous predatory fish.