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Satellite photograph courtesy DigitalGlobe, Inc.
Published July 28, 2014
In the olden days of scientific research, the only way to know how many buffalo roamed the prairie or monkeys bounced around the rain forest was to trek out there and take a head count.
But thanks to advances in satellite imagery, researchers today can take stock of some species without risking a single venomous snakebite or frost-bitten toe.
Take Seth Stapleton, a postdoctoral researcher at the University of Minnesota in St. Paul, who published a study this month in PLOS ONE on new ways to spot far-flung polar bears, including leveraging the same satellite that provides images for Google Earth.
Even though polar bears are the biggest bear species alive today and one of the most widely studied large mammals on Earth, we know surprisingly little about their whereabouts across much of the remote Arctic. (See more pictures of Arctic animals.)
To find the white bears on the icy landscape, Stapleton and colleagues restricted their scope to darker islands where bears often get stranded in the late summer after the surrounding ice melts.
The researchers successfully identified nearly a hundred polar bears by satellite. In a separate test, they verified that what they were seeing were actually bears (and not rocks or foam) by conducting aerial surveys in a helicopter.
What's more, new advances in satellite resolution and automation may one day allow us to count polar bears no matter what they're standing on.
"The technology is evolving so rapidly, it has the potential to open up huge areas of research and conservation avenues," said Stapleton. (Related: "Eye on the Tiger: Satellite Images a New Tool for Conservation.")
Let's take a look at a few more animals getting the cosmic paparazzi treatment.
Emperors may be the largest penguins on Earth, but that isn't the only thing that makes them visible from space. In fact, the most conspicuous evidence of an emperor penguin colony is what they leave behind on the ice—their poop.
"The brown stains stand out really well on the fresh snow," said Peter Fretwell, a scientist with the British Antarctic Survey. (Related: "Emperor Penguins Counted From Space—A First.")
Using Landsat satellite images of Antarctica, Fretwell and his colleagues have found that they can use these "fecal stains" as an indicator of a potential colony. Once the team finds a brown spot, they can zero the satellites in to count birds individually or make population estimates based on how many penguins are huddled together.
Just by looking at such satellite images, Fretwell and his colleagues have more than doubled the number of known emperor penguin colonies.
Fretwell also led a study about detecting whales from space, published in PLOS ONE in 2014. Instead of scanning the whole ocean for whale tails, or flukes, his study focused on Golfo Nuevo, Argentina—a bay where right whales come to breed between July and November.
Breeding areas are ideal for counting whales by satellite because many species choose calm, clear waters where they can bask near the surface with their calves.
Fretwell found that it was indeed possible to manually count whales by satellite. What's more, he and his team looked at possible ways computer animation could help scientists cover more ground.
For instance, in the simplest analysis, the researchers found that the computer could identify all the bright areas of a whale-ish size and shape on a given image.
In fact, Fretwell said right whales may be easier for a computer to identify than other species, on account of the gray-white calluses that grow on the animal's dark heads.
Just imagine having a growth on your face visible from space.
Bats, Birds, and Turtles
If the goal is to spot an animal using satellite imagery, then the animal will obviously have to be relatively large.
For instance, Stapleton said an adult male polar bear appears as no more than six to eight white pixels using the WorldView-2 satellite.
But a new addition to the International Space Station, called ICARUS (International Cooperation for Animal Research Using Space), may one day soon help scientists keep tabs on individual animals smaller than a Smart car.
Most GPS tags log location data but lack the power to transmit that information up to a satellite. This means a study animal must be recaptured at some point to obtain that information—a particularly difficult feat when you're working with small migratory animals.
But with the new ICARUS hardware, scientists will be able to employ more advanced GPS tags that transmit information back to the space station, which orbits much closer to Earth than most satellites do. (See pictures: "20 Stunning Shots of Earth From Space.")
The ICARUS Initiative aims to track birds, bats, sea turtles, and rodents to better understand ecosystems, improve aviation safety, track endangered species, and monitor the spread of infectious diseases.
And the transmitters are getting smaller all the time. One day soon, it may be possible to monitor a single monarch butterfly flying in your backyard from more than 200 miles (320 kilometers) up in the sky.
Now that's out of this world.
Always intresting to see this research, but far more questions on my mind after learning something like this. The information here I would compare to icing on the cake. I want to know what it cost, what projects are chosen, the length of a stdy on a specific species, can this be successfully used to save endangered animals in Africa, and South America..
Great article. This has been an interesting development in animal studies over the last decade. Adding thermal imaging will also be important.
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