Navigation Links
Songbirds tweak their tunes in different ways to cope with clamor

AUDIO: Listen to a plumbeous vireo singing in a quiet area. This was recorded by lead author Clinton Francis of the National Evolutionary Synthesis Center.

Click here for more information.

Durham, NC Some birds that live near noisy sites can alter their songs to deal with din. But closely related species with similar songs may tweak their tunes in different ways, says a new study led by Clinton Francis of the National Evolutionary Synthesis Center in Durham, NC.

The study is part of a growing field that looks at noise pollution and its effects on wildlife. Honking horns, blaring sirens, and roaring machinery are particularly problematic for birds, Francis said.

Birds rely on songs to defend their territories and attract a mate. "When something interferes with their ability to hear each others' songs, it can lead to a communication breakdown," Francis explained. Noise can drown out other sounds in the environment too, like approaching predators, he added.

While some birds can cope with noise by altering their songs, less flexible birds may have to abandon noisy areas altogether. Can we predict which species will be able to adjust their songs, and which will be forced to flee?

Scientists would like to be able to predict which species will be most threatened by an increasingly noisy world, Francis said. To do that, it helps to know if closely related species respond similarly to noise.

AUDIO: Now listen to a plumbeous vireo singing near industrial-grade noise from a natural gas extraction site. This was recorded by lead author Clinton Francis of the National Evolutionary Synthesis Center....

Click here for more information.

To find out, Francis and his colleagues surveyed two closely related species with similar songs the grey vireo and the plumbeous vireo both living near natural gas extraction sites in the Bureau of Land Management's Rattlesnake Canyon Wildlife Area in northern New Mexico.

Since 2005, Francis has studied the effects of industrial-grade noise from natural gas wells on songbirds. The advantage of studying these sites, Francis notes, is they offer plenty of noise without the confounding factors that plague noise studies near roadways, such as pollution and collisions.

Some gas wells are coupled with noisy compressors that extract the gas and transport it through pipelines. The compressors roar and rumble day and night, 365 days a year at greater than 95 decibels a noise level comparable to a motorcycle less than 50 feet away. "You need hearing protection if you're next to them," Francis said.

The researchers counted and recorded plumbeous vireos and grey vireos living near natural gas wells with noisy compressors. They then compared this data with song and survey data they collected from quiet wells without compressors. The results, published this week in Biology Letters, showed the two species are just as common in noisy sites as quiet ones, but they alter their songs in different ways.

Each vireo's song is a short whistled phrase with multiple notes, like a musical score, Francis explained. "Plumbeous vireos raised the pitch of the lowest part of their song, while grey vireos raised the pitch of the highest part of their song," Francis said.

Singing higher-pitched songs may make them easier to hear above the low frequencies typical of human-made noise, he added.

Both birds also changed the length of their songs, but in opposite ways. Whereas plumbeous vireo songs got shorter with increased background noise, grey vireo songs grew longer. "Grey vireo songs in noisy sites were nearly one and a half times as long as their counterparts in quiet sites," Francis said.

The results back up other studies showing some birds can cope with noise by altering their songs. But given the different modifications made by closely related species, it may be difficult to predict what these altered songs will sound like in diverse bird communities, Francis said.

"Closely related species may use different strategies to deal with noise," he said.

The researchers report their findings in the May 25 issue of Biology Letters.


Contact: Robin Ann Smith
National Evolutionary Synthesis Center (NESCent)

Related biology news :

1. Tweeting teenage songbirds reveal impact of social cues on learning
2. Transgenic songbirds provide new tool to understand the brain
3. Beavers: Dam good for songbirds
4. Syracuse University scientists discover new hitch to link nerve cell motors to their cargo
5. Discovery of DNA silencing mechanism reveals how plants protect their genome
6. Seals sense shapes using their whiskers to feel wakes
7. JAMIA reports on people, their information needs and social networks
8. Succulent plants waited for cool, dry Earth to make their mark
9. New mothers can learn a lot from watching their babies
10. Scientists can track origin of shark fins using zip codes in their DNA
11. Too many relatives ruining your picnic? Be glad the flies dont invite their cousins
Post Your Comments:
Related Image:
Songbirds tweak their tunes in different ways to cope with clamor
(Date:11/10/2015)... NEW YORK , Nov. 10, 2015 /PRNewswire/ ... refers to behavioral biometrics that helps to identify ... prevent fraud. Signature is considered as the secure ... for the identification of a particular individual because ... offers more accurate results especially when dynamic signature ...
(Date:11/9/2015)... , Nov. 9, 2015  Synaptics Inc. (NASDAQ: ... today announced broader entry into the automotive market with ... match the pace of consumer electronics human interface innovation. ... are ideal for the automotive industry and will be ... Europe , Japan ...
(Date:11/2/2015)... MENLO PARK, Calif. , Nov. 2, 2015 /PRNewswire/ ... to $9 million to provide preclinical development services to ... Under the contract, SRI will provide scientific expertise, modern ... a wide variety of preclinical pharmacology and toxicology studies ... --> --> The PREVENT Cancer Drug ...
Breaking Biology News(10 mins):
(Date:11/24/2015)... Malaysia , Nov. 24, 2015  Asia-Pacific ... contract research organisation (CRO) market. The trend of ... in lower margins but higher volume share for ... capacity and scale, however, margins in the CRO ... Organisation (CRO) Market ( ), finds ...
(Date:11/24/2015)... SUNNYVALE, Calif. , Nov. 24, 2015 ... executives will be speaking at the following conference, and ... New York, NY      Tuesday, December 1, ... New York, NY      Tuesday, December 1, ...      Piper Jaffray Healthcare Conference, New York, NY ...
(Date:11/24/2015)... , Nov. 24, 2015 /CNW/ - iCo Therapeutics ("iCo" ... reported financial results for the quarter ended September ... in Canadian dollars and presented under International Financial ... States ," said Andrew Rae , ... regarding iCo-008 are not only value enriching for ...
(Date:11/24/2015)... ... November 24, 2015 , ... International Society for Pharmaceutical Engineering ... premier annual events for pharmaceutical manufacturing: 2015 Annual Meeting. The conference took place ... the largest number of attendees in more than a decade. , “The ...
Breaking Biology Technology: