但係佢哋都好脆弱 唔單只會受到自然嘅干擾 譬如特別鍾意侵襲老樹嘅樹皮甲蟲 仲受到高強度伐木同清場式伐木嘅影響
However, they are vulnerable, not only to natural disturbances, such as bark beetles, which are particularly fond of attacking old trees, but also to intensive logging and clearance