There would be none. If one were to remove all the predators from the ocean, we would see over populations in marine animals that would affect the flora in the oceans. What I'm saying is that we'll see a similar event to what occurred in Yellowstone National Park before the wolves were reintroduced into the National Park.
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there predators would become over populated and couse a major mix up with the food chain of the ocean.
Without plants, the base of the ocean's food chain would be disrupted, leading to the collapse of the ecosystem. Plant eaters such as herbivorous fish rely on plants for food, and predators depend on plant eaters for sustenance. The absence of any of these groups would result in a chain reaction that would disrupt the balance of the entire ocean ecosystem.
They are a vital part of the ocean's ecosystem. Without otters, sea urchins would have no predators and would overpopulate and likely destroy kelp forests, which are a food source for urchins.
In the wild, predators for horses would be determined by their age. Newborns would be prey for wolves. Older horses, especially the elderly, would be prey for the top predators like the cougar.
Orangutans are omnivores so they would also qualify as predators.
there is more food for predators to eat in grasslands
there is more food for predators to eat in grasslands
Decline of prey, decline of space, foreign predators that hunt both predators and prey
The availability of food. Other key factors are the environment (not many mice to be found on the ocean floor, nor in Antarctica!) and predators.
The electric eel does not have any threats from predators, but in such a situation would assume it would shock them
Indian ocean you cross the Indian ocean to get to the other side