sábado, 18 de abril de 2009

Chimps Trade Meat for Sex -- And It Works

Nick Wadhams in Nairobi, Kenya
for National Geographic News
April 7, 2009
 
The time-honored tradition of the dinner date may be just one more example of evolution at work.

Wild male chimps that share meat with females double their chances of having sex with those females, a new study says. The findings support a long-held hypothesis that food sharing improves male chimpanzees' chances of mating.

Studies had long shown that male chimpanzees shared meat with females, which don't typically hunt. The reason for the meat sharing, however, was a mystery—though perhaps not too tough to guess.

Males observed in the West African nation of Côte d'Ivoire (Ivory Coast) shared monkey meat with females that exhibited the pink swellings on their rear ends that indicate ovulation and sexual availability. (Related: "Butts, Faces Help Chimps Identify Friends.")

More surprising was that males shared meat with females that didn't have sexual swellings, perhaps in hopes of future success, the researchers say.

The sex "may not necessarily occur immediately—it could occur sometime in the future," said study co-author Cristina M. Gomes, a researcher at the Max Planck Institute for Evolutionary Anthropology in Germany.

Meat is generally a rare treat for chimps, whose diet consists mainly of fruits and vegetables.

Evolution at Work?

The findings could shed light on our own evolutionary origins, researchers said.

Studies of human hunter-gatherer societies have long shown that skillful hunters have more offspring and wives. But scientists are divided on how, or whether, hunting skills and mating success were connected. 

The fact that the chimp males also shared meat with females not in heat could also add new fire to the debate about chimpanzees' cognitive abilities, experts add. That's because the research might suggest that chimps can anticipate future interactions or remember interactions they had in the past.

Findings published April 7 by the journal PLoS ONE.

New orangutan population found in Indonesia


JAKARTA, Indonesia (AP) — Conservationists have discovered a new population of orangutans in a remote, mountainous corner of Indonesia — perhaps as many as 2,000 — giving a rare boost to one of the world's most endangered great apes.

A team surveying forests nestled between jagged, limestone cliffs on the eastern edge of Borneo island counted 219 orangutan nests, indicating a "substantial" number of the animals, said Erik Meijaard, a senior ecologist at the U.S.-based The Nature Conservancy.

"We can't say for sure how many," he said, but even the most cautious estimate would indicate "several hundred at least, maybe 1,000 or 2,000 even."

The team also encountered an adult male, which angrily threw branches as they tried to take photos, and a mother and child.

There are an estimated 50,000 to 60,000 orangutans left in the wild, 90 percent of them in Indonesia and the rest in neighboring Malaysia.

The countries are the world's top producers of palm oil, used in food, cosmetics and to meet growing demands for "clean-burning" fuels in the U.S. and Europe. Rain forests, where the solitary animals spend almost all of their time, have been clear-cut and burned at alarming rates to make way for lucrative palm oil plantations.

The steep topography, poor soil and general inaccessibility of the rugged limestone mountains appear to have shielded the area from development, at least for now, said Meijaard. Its trees include those highly sought after for commercial timber.

Birute Mary Galdikas, a Canadian scientist who has spent nearly four decades studying orangutans in the wild, said most of the remaining populations are small and scattered, which make them especially vulnerable to extinction.

"So yes, finding a population that science did not know about is significant, especially one of this size," she said, noting that those found on the eastern part of the island represent a rare subspecies, the black Borneon orangutan, or Pongo pygmaeus morio.

The 700-square mile (2,500-square kilometer) jungle escaped the massive fires that devastated almost all of the surrounding forests in the late 1990s. The blazes were set by plantation owners and small-scale farmers and exacerbated by the El Nino droughts.

Nardiyono, who headed The Nature Conservancy's weeklong survey in December, said "it could be the density is very high because after the fires, the orangutans all flocked to one small area."

It was unusual to come face-to-face with even one of the elusive creatures in the wild and to encounter three was extraordinary, he said, adding that before this expedition, he had seen just five in as many years.

Conservationists say the most immediate next step will be working with local authorities to protect the area and others that fall outside of national parks. A previously undiscovered population of several hundred also was found recently on Sumatra island, home to around 7,000.

"That we are still finding new populations indicates that we still have a chance to save this animal," said Paul Hartman, who heads the U.S.-funded Orangutan Conservation Service Program, adding it's not all "gloom and doom."

Noviar Andayani, head of the Indonesian Primate Association and Orangutan Forum, said the new discoveries point to how much work still needs to be done to come up with accurate population assessments, considered vital to determining a species' vulnerability to extinction.

"There are many areas that still have not been surveyed," she said, adding that 18 private conservation groups have just started work on an in-depth census based on interviews with people who spend time in the forests.

They include villagers and those working on plantations or within logging concessions.

"We hope this will help fill in a few more gaps," said Andayani, adding that preliminary tests in areas where populations are known indicate that the new interview-based technique could provide a clearer picture than nest tallies.

"Right now the information and data we have about orangutans is still pretty rudimentary," she said.

Some experts say at the current rate of habitat destruction, the animals could be wiped out within the next two decades.