A juvenile Western Scrub-jay in Santa Cruz, California, USA.
Noise Pollution Is Changing Forests
Post: March 27, 2012 10:20 am
Author: Sindya N. Bhanoo
Source: New York Times
A few years ago, researchers discovered that in areas polluted by human-made noise, a species of hummingbird seemed to increase in population, while a jay species seemed to decrease.
The same researchers now report that noisy areas have more flowers, but fewer trees. The findings appear in the current issue of the Proceedings of the Royal Society B: Biological Sciences.
It’s a domino effect, said Clinton D. Francis, an evolutionary ecologist at the National Evolutionary Synthesis Center in Durham, N.C.
Pinyon pine trees rely on scrub jays to disperse their seeds, he said. And black-chinned hummingbirds, which pollinate flowers, seek out noisy areas to avoid the jays, which eat their eggs and even their nestlings.
The scientists set up motion-activated cameras at various sites in the Rattlesnake Canyon Wildlife Area, in northwestern New Mexico. Some sites were quiet; others were near natural gas wells, equipped with noisy compressors.
Dr. Francis’s team found that in noisy areas, many mice seek out pinyon seeds while scrub jays avoid them altogether.
Read more at the New York Times