If the spiders population increases, then they will eat all the beetle larva, and if there is no beetle larva, then nothing would be eating the woodlouse, which would overpopulate the woodlouse, which would eat all the leaves.
If the spiders population decreases, then there would be less of them to eat the beetle larva, and then there would be too many beetle larva, who would eat all the woodlouse. If there aren’t enough woodlouse to eat all the leaves, then there would be more leaves.
If the spiders population decreases, then there would be less of them to eat the beetle larva, and then there would be too many beetle larva, who would eat all the woodlouse. If there aren’t enough woodlouse to eat all the leaves, then there would be more leaves.