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Two orcas whales are hunting and eating great white sharks, according to new research.
A recent article inAfrican Journal of Marine Sciencefocuses on two killer whales researchers have discovered that hunt great white sharks off the coast of South Africa. The whale pair’s appetite for great whites has sent the sharks fleeing out of the area.
“Initially, following an orca attack in Gansbaai, individual great white sharks did not appear for weeks or months,” the article’s lead author, Alison Towner, told SWNS.
According to the article’s findings, since 2017, eight great white sharks have washed up dead on South African shores with identifiable orca bite marks.
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Researchers believe the orcas have killed more than the eight great whites found washed up on shore and that other killer whales are capable of similar attacks.
Orcas are the iconic great white shark’s only predator — apart from humans. The whales can reach up to 30 feet in length and weigh over six tons — feeding on fish, squid, seals, and sea birds. Great whites can reach up to 22 feet long and weigh around 2.5 tons.
Towner, a Ph.D. student at Rhodes University in Makhanda, South Africa, said that this research “is particularly important” because it determines “how large marine predators respond to risk.”
She added that the research can also help scientists understand the “dynamics of coexistence” between “other predator communities.”
Towner’s recently published study used long-term sightings and tagging data to show that the two orcas have scared great whites away from South Africa’s Gansbaai coast, which the sharks dominated for years. Located 60 miles east of Cape Town, Gansbaai was known for great white sightings.
Towner, a senior biologist at the Dyer Island Conservation Trust off the southern tip of Africa, lives in Gansbaai and has witnessed firsthand how the two shark-hunting orcas have driven great whites out of the area and changed the sea’s ecosystem.
“Balance is crucial in marine ecosystems. For example, with no great white sharks restricting Cape fur seal behavior, the seals can predate on critically endangered African penguins or compete for the small pelagic fish they eat,” Towner added.
source: people.com
