The study, published in the journal Nature Ecology & Evolution, focuses on killer whales, which are top predators in the ocean. Killer whales feed on a variety of marine mammals, including seals, sea lions, and porpoises. When killer whale populations decline, the number of seals and other marine mammals increases, which can have negative effects on other species in the food web.
For example, when killer whale populations decline, the number of seals increases. Seals eat a lot of fish, so when seal populations increase, the number of fish decreases. This can have negative effects on other animals that rely on fish for food, such as seabirds and other marine mammals.
The study also found that when killer whale populations decline, the number of other predators, such as sharks, increases. This is because sharks compete with killer whales for food. When killer whale populations decline, there is less competition for food, so shark populations increase.
The study's findings suggest that predator mass mortality events can have significant effects on food webs, and these effects can ripple through the entire ecosystem. This is important information for conservation biologists, as it helps them understand how changes in the abundance of one species can affect the entire ecosystem.
"Our study shows that predator mass mortality events can have a devastating impact on food webs," said study lead author Kyle Elliot, a postdoctoral researcher at UCSB. "This information is critical for conservation biologists as they work to protect endangered species and maintain the health of our oceans."
