Sharks are top or “apex” predators in the marine ecosystem. This is because they have very few natural predators. A cascade effect naturally occurs in a balanced, healthy ecosystem, whether it be marine or terrestrial. Sharks as the apex predator, act as a regulator for biodiversity. They directly limit the abundance of species below them in the cascade or food chain. Sharks diets are especially varied, so that no one species of prey will become low in numbers through over predation. If certain populations of prey are low, sharks are able to switch to another food source. This continues throughout the food chain, and is a sign of a healthy, biodiverse ecosystem. It is a naturally occurring event, which is greatly important, to provide a balance of species within the ecosystem itself. 🎥: @mikecoots