Scientists study swans' bottoms

A A A

Scientists have been studying the backsides of Bewick's swans as they turn tail for their breeding grounds, to learn more about why their numbers are falling.







Experts are hoping that bulging bums will show that the sharp declines experienced by the species are not the result of a lack of food at their wintering sites in the UK.



The swans have been leaving the UK where up to 8,000 over-winter between October and March, and heading off on their annual migration to the Russian Arctic for the summer.



But the numbers coming to Europe to spend the winter have dropped sharply by more than a quarter in a decade, from 29,000 in 1995 to around 21,000 in 2005.



Experts believe that a number of factors are affecting the birds' survival, including habitat and weather changes in their breeding grounds.



The Bewick's swans are also at risk of collisions with power lines, lead poisoning and illegal shooting.



Trained observers at the Wildfowl and Wetlands Trust (WWT) at Slimbridge, Gloucestershire and Welney, Norfolk, have been studying the swan's bottoms as they depart to conduct "abdominal profiling".



By recording the size of the area between the birds' legs and tail where they store the fat they have built up over the winter, the researchers can see if the swans have found enough food during the last few months to get them 2,500 miles back to their breeding grounds.



The aim is to rule out a shortage of suitable food at wintering grounds in the UK as one of the causes of the bird's falling numbers.



Julia Newth, WWT researcher, said: "We need to eliminate the possibility that the swans are suffering while in the UK.



"In a slim bird the bum will look slightly concave, whereas a well-fed bird will have a double bulge.



"The analysis has yet to be bottomed out but our observations in the field certainly suggest they are leaving for the journey with big healthy behinds.



"We need to do further work to see whether their body conditions have changed over the years, and, if so, whether this is connected with the decline in numbers seen in recent years."



Using results from this year's observations and data collected during the 80s, 90s and last year, experts hope to rule out the possibility that the reduction in overwintering swans is related to changes in habitat at UK sites.



The research will also give an indication of how the swans are responding to environmental change and help drive conservation efforts in the future, she said.

News
scienceExcitement from alien hunters at 'evidence' of extraterrestrial life
Life and Style
Customers can get their caffeine fix on the move
food + drink
Sport
sport
Sport
David Moyes gets soaked
sport Moyes becomes latest manager to take part in the ALS challenge
PROMOTED VIDEO
Have you tried new the Independent Digital Edition apps?
Life and Style
techCould new invention save millions in healthcare bills?
News
peopleEnglishman managed quintessential Hollywood restaurant Chasen's
Life and Style
food + drinkHarrods launches gourmet food qualification for staff
Voices
Mosul dam was retaken with the help of the US
voicesRobert Fisk: Barack Obama is following the jihadists’ script
Arts and Entertainment
Michael Flatley prepares to bid farewell to the West End stage
danceMichael Flatley hits West End for last time alongside Team GB World champion Alice Upcott
News
Members and supporters of the lesbian, gay, bisexual, transgender (LGBT) community walk with a rainbow flag during a rally in July
i100
Life and Style
Black Ivory Coffee is made using beans plucked from elephants' waste after ingested by the animals
food + drinkFirm says it has created the "rarest" coffee in the world
Arts and Entertainment
Loaded weapon: drugs have surprise side effects for Scarlett Johansson in Luc Besson’s ‘Lucy’
filmReview: Lucy, Luc Besson's complex thriller
Arts and Entertainment
Jamie T plays live in 2007 before going on hiatus from 2010
arts + entsSinger-songwriter will perform on the Festival Republic Stage
Life and Style
food + drinkThese simple recipes will have you refreshed within minutes
News
Jermain Defoe got loads of custard
i100
Latest stories from i100
Have you tried new the Independent Digital Edition apps?
iJobs Job Widget
iJobs General

Business Analyst - Banking - London - £550 - £650

£550 - £650 per day: Orgtel: Business Analyst - Traded Credit Risk - Investmen...

Data Insight Manager - Marketing

£32000 - £35000 Per Annum: Clearwater People Solutions Ltd: Our client based o...

Data Centre Engineer - Linux, Redhat, Solaris, SAN, Puppet

£55000 per annum: Harrington Starr: A financial software vendor at the forefro...

.NET Developer

£600 per day: Harrington Starr: .NET Developer C#, WPF,BLL, MSMQ, SQL, GIT, SQ...

Day In a Page

Air strikes? Talk of God? Obama is following the jihadists’ script

Air strikes? Talk of God? Obama is following the jihadists’ script

The President came the nearest he has come yet to rivalling George W Bush’s gormless reaction to 9/11 , says Robert Fisk
Ebola outbreak: Billy Graham’s son declares righteous war on the virus

Billy Graham’s son declares righteous war on Ebola

A Christian charity’s efforts to save missionaries trapped in Africa by the crisis have been justifiably praised. But doubts remain about its evangelical motives
Jeremy Clarkson 'does not see a problem' with his racist language on Top Gear, says BBC

Not even Jeremy Clarkson is bigger than the BBC, says TV boss

Corporation’s head of television confirms ‘Top Gear’ host was warned about racist language
Nick Clegg the movie: Channel 4 to air Coalition drama showing Lib Dem leader's rise

Nick Clegg the movie

Channel 4 to air Coalition drama showing Lib Dem leader's rise
Philip Larkin: Misogynist, racist, miserable? Or caring, playful man who lived for others?

Philip Larkin: What will survive of him?

Larkin's reputation has taken a knocking. But a new book by James Booth argues that the poet was affectionate, witty, entertaining and kind, as hitherto unseen letters, sketches and 'selfies' reveal
Madame Tussauds has shown off its Beyoncé waxwork in Regent's Park - but why is the tourist attraction still pulling in the crowds?

Waxing lyrical

Madame Tussauds has shown off its Beyoncé waxwork in Regent's Park - but why is the tourist attraction still pulling in the crowds?
Texas forensic astronomer finally pinpoints the exact birth of impressionism

Revealed (to the minute)

The precise time when impressionism was born
From slow-roasted to sugar-cured: how to make the most of the British tomato season

Make the most of British tomatoes

The British crop is at its tastiest and most abundant. Sudi Pigott shares her favourite recipes
10 best men's skincare products

Face it: 10 best men's skincare products

Oscar Quine cleanses, tones and moisturises to find skin-savers blokes will be proud to display on the bathroom shelf
Malky Mackay allegations: Malky Mackay, Iain Moody and another grim day for English football

Mackay, Moody and another grim day for English football

The latest shocking claims do nothing to dispel the image that some in the game on these shores exist in a time warp, laments Sam Wallace
La Liga analysis: Will Barcelona's hopes go out of the window?

Will Barcelona's hopes go out of the window?

Pete Jenson starts his preview of the Spanish season, which begins on Saturday, by explaining how Fifa’s transfer ban will affect the Catalans
Middle East crisis: We know all too much about the cruelty of Isis – but all too little about who they are

We know all too much about the cruelty of Isis – but all too little about who they are

Now Obama has seen the next US reporter to be threatened with beheading, will he blink, asks Robert Fisk
Neanderthals lived alongside humans for centuries, latest study shows

Final resting place of our Neanderthal neighbours revealed

Bones dated to 40,000 years ago show species may have died out in Belgium species co-existed
Scottish independence: The new Scots who hold fate of the UK in their hands

The new Scots who hold fate of the UK in their hands

Scotland’s immigrants are as passionate about the future of their adopted nation as anyone else
Britain's ugliest buildings: Which monstrosities should be nominated for the Dead Prize?

Blight club: Britain's ugliest buildings

Following the architect Cameron Sinclair's introduction of the Dead Prize, an award for ugly buildings, John Rentoul reflects on some of the biggest blots on the UK landscape