Final answer:
The term that best describes the brown bears in the Canadian river ecosystem is limiting factor.
Step-by-step explanation:
The term that best describes the brown bears in the Canadian river ecosystem is limiting factor. A limiting factor is a biotic or abiotic factor that restricts the growth or abundance of a population. In this case, the increasing number of brown bears is causing the carrying capacity for fish to decrease, as the bears are consuming the fish as their primary source of food.
Learn more about The impact of brown bears on the carrying capacity of fish in a Canadian river ecosystem