What ecological factor concerning Macquarie Island elevates the risk to the entire Royal Penguin species?

Answer

Their reliance on a single major breeding location.

Due to their reliance on one major breeding location, a localized ecological event, such as an increase in predator numbers, could have disproportionately large negative consequences for the entire species' reproductive success.

What ecological factor concerning Macquarie Island elevates the risk to the entire Royal Penguin species?
Predatoranimalwildlifepenguinroyal penguin