Conservationists have taken the first detailed look at the world’s mammals in more than a decade, and the news isn’t good.
“Our results paint a bleak picture of the global status of mammals worldwide,” the team led by Jan Schipper of the International Union for the Conservation of Nature (IUCN) in Gland, Switzerland, concluded.
“We estimate that one in four species is threatened with extinction and that the population of one in two is declining,” the researchers said in a report to be published on Friday in the journal Science.
The findings were being released on Monday at the IUCN meeting in Barcelona, Spain.
“I think the bottom line is, what kind of a world do you want to leave for your children,” Andrew Smith, a professor at Arizona State University’s School of Life Sciences, said in a telephone interview.
“How impoverished we would be if we lost 25 percent of the world’s mammals,” said Smith, one of more than 100 co-authors of the report.
“Within our lifetime hundreds of species could be lost as a result of our own actions, a frightening sign of what is happening to the ecosystems where they live,” said Julia Marton-Lefevre, the IUCN director general.
“We must now set clear targets for the future to reverse this trend to ensure that our enduring legacy is not to wipe out many of our closest relatives,” she said.
The IUCN describes itself as the world’s oldest and largest global environmental network. The research for the report took five years and involved more than 1,700 scientists around the world.
The report updates the IUCN’s Red List of Threatened Species, which includes 44,838 species, of which 16,928 are threatened with extinction. Of these, 3,246 are critically endangered, 4,770 are endangered and 8,912 are vulnerable to extinction. The IUCN estimated that 76 mammal species have gone extinct since 1500.
While the new report estimated that one in four mammals is threatened with extinction, the actual numbers listed were 1,141 out of 5,487 species. That comes out to 20.8 percent, closer to one in five.
However, the researchers said that there were several hundred species about which they don’t have enough data to classify. They believe that the lack of information about those animals indicates that they exist in such small numbers that many could be endangered, raising the total to 25 percent or higher, Smith said.
Among the mammals particularly in danger are primates, used for bush meat in parts of Africa and facing a major loss of habitat in Southeast Asia, Smith said.
In general, larger mammals were found to be more threatened than smaller ones. Larger species tend to have lower population densities, grow more slowly and have larger home ranges.
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