For some species, hikers, bikers, and other recreationists could have an impact similar to that of terrifying predators, invading habitat where food can be found, resulting in lower birthrates and even increasing deaths.
“Wildlife, more often than not, probably hear us before they see us, and so we can rarely observe if it is a negative response,” said Kathy Zeller, a co-leader on the new study and a research biologist with the Aldo Leopold Wilderness Research Institute and Rocky Mountain Research Station.
On and off for about four months, whenever a motion-sensitive camera at one end of the trail detected an animal, a boom box about 20 yards away played human sound bites—nothing like a ’90s dance party, just recordings of two hikers chatting or walking quietly, or of large and small groups of mountain bikers. Two more cameras near the boom boxes and one at the other end of the trail recorded wildlife reactions.
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