Adecrease in the grass population will most immediately decrease the available energy for the

Well..it will definitely hurt the consumer of the grass..but it wont hurt as much as it would the apex predator. So lets say a rabbit eats grass and then a snake eats the rabbit and an eagle eats the snakewell because of the grass depletion that means some rabbits wont be able to eat meaning that some snakes wont be able to eat and that hurts the eagle the most because hes supposed to eat rabbits and snakes and now their both gone. hope i helped