B95, the great survivor

By: Alejandra Martins
mongabay.com
June 11, 2012



B95, the remarkable rufus red knot who has flown from the Earth to the moon in terms of distance. Photo by: Jan Van de Kam.
B95, the remarkable rufus red knot who has flown from the Earth to the moon in terms of distance. Photo by: Jan Van de Kam.

He is so long-lived that he has surpassed all expectations, touching hearts throughout the American continent, bringing together scientists and schools, inspiring a play and now even his own biography.

B95 is the name of a rufus red knot (Calidris canutus rufus), a migratory bird that in his annual journeys of 16,000 kilometers (9,940 miles) each way from the Canadian Arctic to Tierra del Fuego, in Argentina, has flown a distance bigger than the one between the Earth and Moon.

The story of B95 has inspired a book by American writer Phillip Hoose, which will be published next month. The bird has become a symbol of survival against all odds and of the plight of rufus red knots, whose populations have declined dramatically in recent years mainly due to overfishing in Delaware Bay, in the U.S., where the birds stop to refuel on their way back to the Arctic.


"We can't believe this bird is still alive, because it has been through terrible situations. That's why it is so special and everyone wants to see B95," says biologist Patricia González, part of the team that ringed the bird in Argentina in 1995.

"Rufus red knots have faced so many declines that birds probably don´t live more than seven years," says Gonzalez.

Allan Baker, an ornithologist with the Royal Ontario Museum who travels every year to Patagonia to work with González, has also been monitoring the bird since 1995.

"B95 is so popular because he is at least 18 years old, and maybe older because he may have been 3 or more years old when he was caught," Baker told the BBC. "This is very old for a shorebird like a red knot, something like reaching a 100 if you were a human."

Migratory route

Children in Patagonia who help with the release of birds captured for ringing.
Children in Patagonia who help with the release of birds captured for ringing.

"When we started ringing red knots in 1995 there was a system of colors agreed by all the countries in the Americas," explains Gonzalez, who coordinates the Wetlands Program of the Inalafquen Foundation in the city of San Antonio Oeste.

The use of telescopes and digital cameras allows ornithologists to read the inscriptions on the flags of birds caught in previous years.

B95 has been seen on many occasions throughout his migratory route in the last few years and was last spotted in May in Delaware Bay.

Not all birds follow the same route. "We do not know B95´s exact journey except that he refuels in Delaware Bay in May before departing for the Arctic breeding ground in central Canada," says Baker.

Red knots reach the Canadian Arctic in June to reproduce. A month later adults and juveniles start the journey back to Argentina, often stopping in the Mingan Archipelago in Quebec. They arrive in Tierra del Fuego, both in Argentina and Chile, around October and stay there until about February. Only recently scientists have discovered that some birds can fly non stop at least 8,000 kilometers (4,970 miles) to the U.S. from their wintering grounds in South America.

Delaware Bay, the great challenge

Red knots take-off in Delaware.
Red knots take-off in Delaware.

Rufus red knots face one of their toughest challenges in Delaware Bay, a crucial stop on their way to the Arctic.

"Delaware Bay supports the world's largest population of horseshoe crabs and each May they come ashore and lay eggs on the beaches. There are so many that they start digging up eggs that were laid by other crabs so that eggs end up on the surface of the beach. This happens exactly at the time when red knots and other shorebirds are coming from their southern wintering area on their way to the Arctic," says Larry Niles, a biologist with the Conserve Wildlife Foundation of New Jersey, who has been monitoring the birds for many years.

The eggs are almost all fat and when they are abundant the birds, which arrive in depleted conditions, can quickly gain up to double their body weight.

"Up until the early 90s commercial fishermen thought horseshoe crabs were of no value and there were millions of crabs coming ashore. But then they started getting good prices for welch and wanted bait to catch them," Niles explains. "The harvest of crabs for bait went from a few hundred thousand each year to 2.5 million each year and because they don’t mature sexually until they are 9 or 10 years old they were quickly overharvested."

By the early 2000s the population of crabs was less than a quarter of what it once was, according to Niles, and the reduction of eggs on the beaches led to a dramatic decline in shorebirds. "On Delaware Bay the numbers fell from nearly a 100,000 each year to about 15,000 last year."

Fishermen are not the only ones catching horseshoe crabs. These animals are also being used as a source for lysate, a chemical used by the medical industry to test for contaminants in injectable drugs or implants.

"It is a huge, US$ 200 million industry and most of the world's lysate is coming from Delaware bay crabs," says Niles.

When crabs are caught for lysate, about a third of their blood is drained by puncturing their heart. The animals can recover if they are properly handled. Niles says 30 percent of the crabs harvested for bleeding die, which could represent a number as high as 600,000 crabs.

"What we are asking for is serious action, now that after many years there are some positive trends and we are getting an increase number of juveniles. We want more eggs on the bay," he says.

Amongst the measures proposed by Niles are tighter controls of overfishing of crabs and better handling to reduce mortality and allow crabs to recover after bleeding.

"Most of the bleeding takes place outside Delaware Bay so the crabs have to be captured at sea in big nets and taken to a dock. There is one bleeder in Delaware Bay with a mortality rate of 5 percent. This shows they can recover if they are not overhandled and quickly put back into the sea."

The Canadian government listed red knots as a threatened species this year, and conservationists are optimistic that the US will follow suit.

This would mean in practical terms that any project that requires alteration to red knot habitats will now have to consider its impacts on the birds.

"B95 INSPIRES ME"

Patricia Gonzalez with a rufus red knot. Photo by: Guy Morrison.
Patricia Gonzalez with a rufus red knot. Photo by: Guy Morrison.

B95 was last seen on the 29th of May in Delaware Bay by Patricia Gonzalez.

"I couldn’t believe it when I used my telescope and confirmed it was B95. He is so old that I was not expecting to see him again. My hands were trembling when I tried to use my camera to take a picture through the telescope," she said.

Gonzalez travels to Delaware every year to help monitor the birds. This year she carried letters from children in Argentina to a school in New Jersey.

"Kids started communicating because of the birds via Skype."

The birds have brought together scientists, volunteers and schools, and none has done so more than B95.

Phillip Hoose hopes his book will bring the story of this great bird to a wider public.

"I draw inspiration from B95. If he can thread the needle year after year, flying through ever more turbulent skies to reach ever more scarce resources, then we can double our efforts to save shorebirds," Hoose told the BBC.

"B95 represents, hope, grit, adaptability, strength, determination. We need to respect and learn more to help the little shorebirds with whom we share the worlds shores. They are among the most marvelous athletes in existence."



Most recent photo of B95. Photo by: Patricia M. Gonzalez.
Most recent photo of B95. Photo by: Patricia M. Gonzalez.















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CITATION:
By: Alejandra Martins
mongabay.com (June 11, 2012).

B95, the great survivor.

http://news.mongabay.com/2012/0611-martins-b95.html