Feeling tired? Blame city living: Living in urban areas could have major impact on biological clocks of humans and animals, say researchers

Researchers compared the internal rhythms of blackbirds living in the countryside and in urban areas and found they differ significantly

Living in urban areas could have major impact on the biological clocks of humans and animals, a study suggests.

City life can be a draining experience compared to living in the countryside. Now scientists have proven its not just humans who are affected.

A team of Scottish scientists measured the circadian rhythms, the 24-hour cycle of biological activity, of blackbirds living in the countryside and in urban areas and found they differ significantly.

The researchers say these changes to their biological rhythms could lead to more health problems and shorter lives. The study also found that city living makes us active for longer and less rested.

The blackbirds in the city began their days earlier and ended them later, being active for around 40 minutes longer than the rural blackbirds. The internal clocks of the city-dwelling birds were “less robust” and more prone to disturbance, the researchers said.

The differences in urban birds may have developed in response to artificial light and increased noise, they said.

Adult male European blackbirds were captured from Munich and a nearby rural forest. They fitted each one with a lightweight radio-transmitter which monitored their daily activity in the wild for 10 days before the birds were recaptured.

They were then kept in light-proofed, sound-insulated chambers and their circadian rhythms were measured under constant conditions. Once the tests were complete, the birds were returned to the wild.

The study, which has been published in the journal Proceedings of the Royal Society B, was carried out by Glasgow University and the Max Planck Institute for Ornithology in Germany.

Barbara Helm, from Glasgow University's Institute of Biodiversity, Animal Health and Comparative Medicine, said: “The daily cycles of activity and rest are based on biological rhythms which have evolved as an adaptation to the rising and setting of the sun.

“We found that the rhythms of urban birds in the wild differ significantly from their forest counterparts.

“On average, they began their daily activities around 30 minutes before dawn, while forest birds began their day as the sun rose. The city birds ended their days around nine minutes later, meaning they were active for about 40 minutes longer each day.

“In constant laboratory conditions, urban birds' circadian (daily) rhythms were clearly altered, running faster by 50 minutes than forest birds and being clearly less robust. There seems to be a different beat to city life.

“Our work shows for the first time that when sharing human habitats, a wild animal species has a different internal clock.

“We'd be keen to find out the costs and benefits of modifying biological rhythms in blackbirds and other animals commonly found in our cities. This may help us to better understand the challenges of coping with urban life.”

Start your day with The Independent, sign up for daily news emails
Arts and Entertainment
Joel Edgerton, John Turturro and Christian Bale in Exodus: Gods and Kings
film
Arts and Entertainment
Brendan O'Carroll as Agnes Brown in the 2014 Mrs Brown's Boys Christmas special
tvCould Mrs Brown's Boys have taken lead for second year?
News
Members and supporters of the lesbian, gay, bisexual, transgender (LGBT) community walk with a rainbow flag during a rally in July
news
Sport
footballLive! Chelsea vs West Ham kicked off 10 Boxing Day matches, with Arsenal vs QPR closing the action
PROMOTED VIDEO
Have you tried new the Independent Digital Edition apps?
ebooks
ebooksA year of political gossip, levity and intrigue from the sharpest pen in Westminster
News
i100
Arts and Entertainment
Amy Adams and Christoph Waltz in Tim Burton's Big Eyes
film reviewThis is Tim Burton’s most intimate and subtle film for a decade
Arts and Entertainment
Jack O'Connell stars as Louis Zamperini in Angelina Jolie's Unbroken
film review... even if Jack O'Connell is excellent
Arts and Entertainment
Madonna is not in Twitter's good books after describing her album leak as 'artistic rape and terrorism'
music14 more 'Rebel Heart' tracks leaked including Pharrell Williams collaboration
Sport
football
Latest stories from i100
Have you tried new the Independent Digital Edition apps?
Independent Dating
and  

By clicking 'Search' you
are agreeing to our
Terms of Use.

iJobs Job Widget
iJobs General

Ashdown Group: Senior Marketing Executive- City of London, Old Street

£40000 - £43000 per annum + benefits: Ashdown Group: Senior Marketing Executiv...

Ashdown Group: Marketing Manager

£40000 - £43000 per annum + benefits: Ashdown Group: An international organisa...

Ashdown Group: Internal Recruiter -Rugby, Warwickshire

£25000 - £30000 per annum: Ashdown Group: Internal Recruiter -Rugby, Warwicksh...

Ashdown Group: Marketing Manager/Marketing Controller (Financial Services)

£70000 - £75000 per annum + benefits: Ashdown Group: Marketing Manager/Marketi...

Day In a Page

A Christmas without hope: Fears grow in Gaza that the conflict with Israel will soon reignite

Christmas without hope

Gaza fears grow that conflict with Israel will soon reignite
After 150 years, you can finally visit the grisliest museum in the country

The 'Black Museum'

After 150 years, you can finally visit Britain's grisliest museum
No ho-ho-hos with Nick Frost's badass Santa

No ho-ho-hos with Nick Frost's badass Santa

Doctor Who Christmas Special TV review
Chilly Christmas: Swimmers take festive dip for charity

Chilly Christmas

Swimmers dive into freezing British waters for charity
Veterans' hostel 'overwhelmed by kindness' for festive dinner

Homeless Veterans appeal

In 2010, Sgt Gary Jamieson stepped on an IED in Afghanistan and lost his legs and an arm. He reveals what, and who, helped him to make a remarkable recovery
Isis in Iraq: Yazidi girls killing themselves to escape rape and imprisonment by militants

'Jilan killed herself in the bathroom. She cut her wrists and hanged herself'

Yazidi girls killing themselves to escape rape and imprisonment
Ed Balls interview: 'If I think about the deficit when I'm playing the piano, it all goes wrong'

Ed Balls interview

'If I think about the deficit when I'm playing the piano, it all goes wrong'
He's behind you, dude!

US stars in UK panto

From David Hasselhoff to Jerry Hall
Grace Dent's Christmas Quiz: What are you – a festive curmudgeon or top of the tree?

Grace Dent's Christmas Quiz

What are you – a festive curmudgeon or top of the tree?
Nasa planning to build cloud cities in airships above Venus

Nasa planning to build cloud cities in airships above Venus

Planet’s surface is inhospitable to humans but 30 miles above it is almost perfect
Surrounded by high-rise flats is a little house filled with Lebanon’s history - clocks, rifles, frogmen’s uniforms and colonial helmets

Clocks, rifles, swords, frogmen’s uniforms

Surrounded by high-rise flats is a little house filled with Lebanon’s history
Return to Gaza: Four months on, the wounds left by Israel's bombardment have not yet healed

Four months after the bombardment, Gaza’s wounds are yet to heal

Kim Sengupta is reunited with a man whose plight mirrors the suffering of the Palestinian people
Gastric surgery: Is it really the answer to the UK's obesity epidemic?

Is gastric surgery really the answer to the UK's obesity epidemic?

Critics argue that it’s crazy to operate on healthy people just to stop them eating
Homeless Veterans appeal: Christmas charity auction Part 2 - now LIVE

Homeless Veterans appeal: Christmas charity auction

Bid on original art, or trips of a lifetime to Africa or the 'Corrie' set, and help Homeless Veterans
Pantomime rings the changes to welcome autistic theatre-goers

Autism-friendly theatre

Pantomime leads the pack in quest to welcome all