The avian activity also changes the chemical flavorof the trees by boosting terpenes—chemicals found to repel tree-eating pests such as bark beetles as well as porcupines and squirrels.
The avian activity also changes the chemical flavorof the trees by boosting terpenes—chemicals found to repel tree-eating pests such as bark beetles as well as porcupines and squirrels.
鸟类活动还会刺激树木产生松烯，改变树木的化学「味道」──这种化学物质已知可以驱除啃食树木的害虫，如树皮小蠹，以及豪猪、松鼠等。