Drought and bark beetles threaten bristlecone pine trees
Forest pathologist Martin MacKenzie strode forward on a narrow path through California’s mythic bristlecone pine forest in the White Mountains near the Nevada border, methodically scanning gnarled limbs for the invaders that threaten the lives of some of the world’s oldest trees. … Now, scientists say, these living symbols of longevity, strength and perseverance may be at an evolutionary crossroads. Hotter droughts and bark beetles are for the first time in recorded history killing bristlecones, according to a recent study published in the scientific journal Forest Ecology and Management.