Turkey Vultures belong to the raptor family. They provide important ecosystem services: eating animal carcasses. This helps to minimize the spread of disease to other animals and regions. (Photo: Ken Slade)
Identifying natural gas leaks from pipelines is important, but with over 300,000 miles of pipe in US, the task can be a daunting one. But as BirdNote®’s Mary McCann reports, a serendipitous tip from an oil worker helped an ornithologist solve mysteries about turkey vultures’ scavenging behavior and interest in gas lines.
[MUX - BIRDNOTE® THEME]
CURWOOD: Birds that feast on carrion send shivers down the spine for many of us, even though they perform a beneficial role in recycling organic matter. And as Mary McCann explains in today’s BirdNote®, there is another useful function that turkey vultures seem able to perform.
BirdNote® Turkey Vultures and Gas Pipelines
MCCANN: In the late 1950s, scientist and ornithologist Kenneth Stager set out to answer, once and for all, a question that has been argued over for decades. Do vultures detect carrion by sight or by smell?
The story goes that his lightbulb moment came when a Union Oil employee told him of vultures congregating at the spots along pipelines where gas leaks were occurring. Why would they do that? Well, because a key ingredient in the odor of carrion is ethyl mercaptan — the same substance companies added to odorless natural gas in their pipelines, so they could smell if there was a leak. With just about the keenest sense of smell in nature, Turkey Vultures can detect this odor in the air at even a few parts per trillion.
So Stager rigged up a mercaptan-emitting machine, took it into the field, and recorded his results. Definitively, he proved that vultures find their prey because of its smell.
Today, there are more sophisticated ways to track pipeline leaks. But who knows? … Now and again, a watchful worker may just cast an eye upward, on the lookout for ominous silhouettes slowly circling against the blue sky.
I am Mary McCann.
Written by Bob Sundstrom
Bird sounds provided by The Macaulay Library of Natural Sounds at the Cornell Lab of Ornithology, Ithaca, New York. Desert ambience: “002 Wind Mod Soft” and “132 Desert Morning Bird Chorus” Nature SFX recorded by Gordon Hempton of QuietPlanet.com
BirdNote’s theme music was composed and played by Nancy Rumbel and John Kessler.
Producer: John Kessler
Executive Producer: Dominic Black
© 2015 Tune In to Nature.org June 2015 Narrator: Mary McCann
Key source: http://davidhaviland.com/?p=13]
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