Toy Helicopters Hover Over Whales to Monitor Health
By Alex Morales
Nov. 12 (Bloomberg) — Toy helicopters are being used to monitor the health of whales by sampling their breath, a technique developed by scientists to overcome the difficulty of approaching the mammals.
Karina Acevedo-Whitehouse, a wildlife epidemiologist at the Zoological Society of London first used the method in 2006 after trying to capture air exhaled by blue and gray whales through their blowholes, with approaches including reaching out from a boat, using an extended pole and firing self-closing capsules into the cetaceans’ breath, known as “blow.”
“I was thinking of how we could approach the whales and collect a biological sample, a clinically relevant sample,” Acevedo-Whitehouse said yesterday in a telephone interview in London. “That’s when I thought, `why not use a remote-control helicopter?”’
The method is giving scientists access to animals that until now have been hard to obtain biological samples from, with tests limited to stranded, captured and dead whales. The technique will help monitor the health of species that are hard to approach at sea and threatened with extinction.
“They’re very difficult animals to study because they’re elusive and it’s an aquatic environment,” said Mark Simmonds, director of science at the Whale and Dolphin Conservation Society, a Chippenham, England-based charity. “It is important to learn as much as we can about the health of these animals.”
Whale Mucus
About a quarter of marine mammals, including whales, seals and dolphins, are threatened with extinction, according to the latest Red List of endangered species published by the International Union for Conservation of Nature in Switzerland. The blue whale is categorized as “endangered,” the second- highest degree of threat for a species in the wild. Gray whales are listed as “least concern.”
“We want to establish a baseline for what pathogens and what bacteria are out there,” Acevedo-Whitehouse said. “What are the micro-organisms that exist in a healthy free-ranging population?”
Simmonds said the efforts with the toy helicopters will add to work that’s been conducted in the U.K. and elsewhere on dead specimens, some of the carcasses still fresh. He spoke today in a telephone interview from Buckie, Scotland, where he is conducting a census of whales and dolphins.
“The blow from a blue whale is a mixture of water, mucus, bacteria and anything else that’s in its lung,” Simmonds said. “It’s a good approach, and it’ll be nice to see it written up. Still, I’m interested to see how close they have to come. Nothing is totally benign if you’re moving a boat around a whale.”
Mastering Copter Skills
Acevedo-Whitehouse worked with Diane Gendron at Mexico’s Inter-Disciplinary Center of Marine Sciences, or CICIMAR, to track the whales in the Pacific Ocean. Because she couldn’t master the skill of flying a toy helicopter from a moving boat, she said she found someone who could: Agustin Payen, a worker from Mexico’s Federal Electricity Commission who usually uses the toy choppers to monitor power lines.
Petri dishes are strapped to the helicopters and then flown into the whale’s breath, which condenses on the glass. When the helicopter flies back, a lid is placed on the dish and the sample is captured, enabling laboratory tests.
“It’s literally their breath: it’s actually quite potent — these are large animals that have been underwater for some time,” Acevedo-Whitehouse said.
Whales are sampled three times, and environmental control samples are taken without a whale present, the researcher said.
Since testing began, Acevedo-Whitehouse has used choppers to collect about 60 samples from blue and gray whales in the Pacific near the Gulf of California and 40 from pilot whales and bottlenose dolphins in the Mediterranean Sea near Gibraltar.
Pathogens Found
The team has detected some pathogens already, Acevedo- Whitehouse said, declining to name them because she’s planning to publish her findings in a scientific journal. Even so, the findings aren’t enough to establish patterns of illness because years of monitoring are required, she said.
“We can’t really say that animals are sick: finding bacteria or a fungus or a virus doesn’t imply that an animal is sick, it just implies that it’s infected,” she said. “That’s exactly why we need a long-term study so that we can know what’s the common or normal pattern and then once you do that, if you start seeing things that weren’t there normally, you can say `wow, I should be concerned about this.”’
To contact the reporter on this story: Alex Morales in London at amorales2@bloomberg.net
Last Updated: November 12, 2008 07:36 EST
