Scientists search for answers as baby whales wash up dead in Argentina
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whales → search → Argentina
Investigators in Argentina are trying to solve the mystery of baby whales washing up dead in unusually high numbers along the country’s Patagonian coast.
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whales → try → coast
Scores of the calf carcasses have been washing ashore around Peninsula Valdes, a major breeding ground for southern right whales in Argentina’s Chubut province.
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Scores → wash → province
Hunted to the brink of extinction in the 19th and 20th centuries, the whales now gather in the peninsula’s sheltered waters to give birth and nurse their young.
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whales → hunt → young
“We’re looking into the whale calf deaths based on 23 years of monitoring that we have of this same population.
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we → look → population
That’s what allows us to say that this is an unusual event,” said Marcela Uhart, a veterinarian with the One Health Institute at the University of California, Davis, who is leading the investigation as head of the Southern Right Whale Health Monitoring Program.
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who → ’ → Program
The leading hypothesis is that the whale calves are suffering infections from marine bacteria that can enter their bodies through injuries inflicted by kelp gulls, Uhart said.
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Uhart → lead → gulls
For decades, the seabirds have pecked at whales surfacing to breathe, gorging on their skin and blubber.
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seabirds → peck → skin
Adults learn to surface with only their heads exposed, keeping their backs underwater and out of reach of the gulls.
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heads → learn → gulls
Calves can’t do that maneuver, leaving them vulnerable to attacks.
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Calves → do → attacks
The carcasses have been washing ashore around the gulf city of Puerto Madryn, including near the central waterfront where they alarm residents and tourists.
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they → wash → residents
Residents have reported hundreds of them, but researchers declined to give a death toll, saying that would become clear after the season ends around late November.
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season → report → November
Uhart and a team of biologists, veterinarians and park rangers have been searching the area for the dead calves from shore and with boats, planes and drones.
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Uhart → search → boats
The work is gruesome: They photograph and examine the bodies, racing against decomposition to collect skin and organ samples for testing at a veterinary school farther north, in the city of Tandil.
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They → photograph → Tandil
Bacteria have already been detected in those tissues, but researchers are still culturing samples to identify the microbes and determine whether infection was the cause of death, she said.
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she → detect → death
Even if bacteria are to blame, researchers must still determine why they have become so deadly this year.
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they → blame → ?
Changes in marine conditions like warming sea temperatures, potentially linked to climate change or El Nino, could contribute to “this perfect storm where this bacteria is powerful enough to overcome the immunity of the babies and cause their deaths,” Uhart said.
uncertain
Uhart → warm → deaths
“So to the extent that we can, we’ll try to identify at least what factors may be triggering this event and making it so massive.”
uncertain
it → try → event
Right whales got their name from whalers who considered them the “right” animals to hunt because they swam slowly, stayed close to shore and floated when killed, according to the International Whaling Commission, a global body tasked with regulating whaling.
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they → get → whaling
Although illegal hunting continued into the 1970s, southern right whales have gradually rebounded since gaining international protection in 1935.
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whales → continue → 1935
But their recovery remains threatened by the same pressures facing whales worldwide: declining food supplies, fishing gear entanglements, oil spills and ship strikes.
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recovery → threaten → whales
If losses on this scale recur, they could slow the population’s recovery.
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they → recur → recovery
By pinpointing what is killing the calves, researchers hope to find ways to protect the vulnerable population.
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researchers → pinpoint → population
“If the cause relates to something that we are doing as humans, then we need to change that,” Uhart said.
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Uhart → relate → that
“We don’t want to endanger these whales again.”
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We → want → whales
The Aporia
