Space pictures pick up lots more penguins
London: Scientists counting emperor penguins from space have found twice as many of the birds in Antarctica as expected.
The discovery is reassuring for a species seen as under threat from global warming and will provide researchers with a benchmark for monitoring the giants of the penguin world in years to come.
Using high-resolution satellite images to study each of 44 colonies around the coastline of Antarctica, experts said on Friday they put the total emperor penguin population at 595,000, or roughly double previous estimates of 270,000 to 350,000.
"It`s good news," team leader Peter Fretwell of the British Antarctic Survey said in an interview. "It gives us a bit more confidence not only that there are lots of emperor penguins out there but that we can actually keep track of them as well."
Seven of the colonies studied had never been seen before.
A key advantage of satellites is that they can capture multiple images in one go, whereas visiting dozens of remote colonies in temperatures as low as -50 degrees Celsius (-58 degrees Fahrenheit) would be hugely expensive and time-consuming.
Still, conducting a penguin roll-call from space is not simple. It took a special technique known as pan-sharpening to increase the resolution of the satellite images to differentiate between birds, shadows and penguin poo, or guano.
While some images remained tricky to analyze, Fretwell believes the overall population figure is correct to within a 10-12 percent margin of error.
Scientists are concerned that emperor penguins will be badly affected by climate change, since they form large colonies on the sea-ice, which is fragile and vulnerable to earlier spring warming. Their more northerly colonies are particularly at risk.
The study by Fretwell and colleagues, published in the online journal PLoS ONE (link.reuters.com/byb67s), marks the first time that researchers have counted the entire population of any species by satellite in a single season.
In future, the same technique could also be use to tot up numbers of other wild animals that stand out clearly against their natural habitat, such as flamingos or reindeer.
Counting other types of penguins from space, however, may not be so easy. While emperors are large and contrast sharply against the white snow and ice on which they stand, other species are smaller and tend to breed on dark-colored rock.
More from India
More from World
More from Sports
More from Entertaiment
- CM Kejriwal shortlists 39 'unwanted' IAS officers in Delhi
- Rajasthan: Gujjars revive reservation agitation, block rail track
- J Jayalalithaa sworn-in as Chief Minister of Tamil Nadu
- Dr Subhash Chandra Show: Aspiring for more than what you have!
- ISIS to buy first nuclear weapon from Pak?
- Mumbai: CCTV captures assailant with gun at Film City
- Mathura SSP receives death threat letter, message for PM Modi
- BJP now central pole of Indian politics: Arun Jaitley
- Maharashtra FDA sends Maggi noodles for lab testing
- See what can Maggi do to your health!
- Watch: Fast N Facts @ 7:30pm
- Haridwar: Hotel Radisson Blu sealed for polluting Ganga
- Delhi: Two killed in road accident in New Ashok Nagar
- Girl in Punjab's Pathankot quit studies for fear of eve-teasing
- Fiji: Floating island restaurant in middle of ocean
- PM Narendra Modi graces Digvijay Singh's son wedding reception
- Goa Board SSC Exam Results 2015 announced
- Rahul Gandhi to pressurise govt to act on one-rank-one-pension issue
- ISIS close to buying nuclear weapon from Pakistan?
- Manohar Parrikar visits forward areas along LoC, reviews security situation
- There will be no delay in appointing CIC, CVC: Jitendra Singh
- Credibility of Prime Minister's Office restored by BJP, says Arun Jaitley
- ISIS justifies raping slave girls, says Michelle Obama is 'worth $40'
- Arvind Kejriwal to highlight AAP govt's 100 days work on Monday
- 'Unhappy' Celina Jaitley asks Sunny Leone to move out?
- BJP's plan for one-year celebration: 200 big rallies, 5,000 public meetings
- IPL 2015 Final: Mumbai Indians vs Chennai Super Kings - Preview
- Heatwave leaves 153 dead in Telangana, Andhra Pradesh
- CBSE Results 2015: 10th board exam results to be declared on May 27
- IPL 8 Final: We need to be at our best against Mumbai, says Michael Hussey