Extinctions are about 1,000 times more frequent now than in the 60 million years before people came along. That’s 10 times higher than what scientists previously thought.
“This reinforces the urgency to conserve what is left and to try to reduce our impacts,” says Jurriaan de Vos, a Brown University researcher. “It was very, very different before humans entered the scene.”
In absolute—albeit rough—terms, researchers calculated a “normal background rate” of extinction, which is how fast species would go extinct without humans, of 0.1 extinctions per million species per year. That revises the figure of 1 extinction per million species per year that Stuart Pimm, a Duke University professor, estimated in prior work in the 1990s. By contrast, the current extinction rate is more on the order of 100 extinctions per million species per year.
Orders of magnitude, rather than precise numbers are about the best any method can do for a global extinction rate, de Vos says, who began the work while at the University of Zurich.
“That’s just being honest about the uncertainty there is in these type of analyses.” The research appears online in the journal Conservation Biology.
Do the math
The new estimate improves markedly on prior ones mostly because it goes beyond the fossil record. Fossils are helpful sources of information, but their shortcomings include disproportionate representation of hard-bodied sea animals and the problem that they often only allow identification of the animal or plant’s genus, but not its exact species.
What the fossils do show clearly is that apart from a few cataclysms over geological periods—such as the one that eliminated the dinosaurs—biodiversity has slowly increased.
The new study next examined evidence from the evolutionary family trees—phylogenies—of numerous plant and animal species. Phylogenies, constructed by studying DNA, trace how groups of species have changed over time, adding new genetic lineages and losing unsuccessful ones. They provide rich details of how species have diversified over time.
“The diversification rate is the speciation rate minus the extinction rate,” says co-author Lucas Joppa, a scientist at Microsoft Research in Redmond, Washington.
“The total number of species on earth has not been declining in recent geological history. It is either constant or increasing. Therefore, the average rate at which groups grew in their numbers of species must have been similar to or higher than the rate at which other groups lost species through extinction.”
The work compiled scores of studies of molecular phylogenies on how fast species diversified.
Just like pay day
For a third approach, de Vos notes that the exponential climb of species diversity should take a steeper upward turn in the current era because the newest species haven’t gone extinct yet.
“It’s rather like your bank account on the day you get paid,” he says. “It gets a burst of funds—akin to new species—that will quickly become extinct as you pay your bills.”
By comparing that rise of the number of species from the as-yet unchecked speciation rate with the historical trend (it was “log-linear”) evident in the phylogenies, he could therefore create a predictive model of what the counteracting historical extinction rate must have been.
The researchers honed their models by testing them with simulated data for which they knew an actual extinction rate. The final models yielded accurate results. They tested the models to see how they performed when certain key assumptions were wrong and on average the models remained correct (in the aggregate, if not always for every species group).
All three data approaches together yielded a normal background extinction rate squarely in the order of 0.1 extinctions per million species per year.
More and more humans
There is little doubt among the scientists that humans are not merely witnesses to the current elevated extinction rate. This paper follows a recent one in Science, authored by Pimm, Joppa, and other colleagues, that tracks where species are threatened or confined to small ranges around the globe.
In most cases, the main cause of extinctions is human population growth and per capita consumption, although the paper also notes how humans have been able to promote conservation.
The new study, Pimm says, emphasizes that the current extinction rate is a more severe crisis than previously understood.
“We’ve known for 20 years that current rates of species extinctions are exceptionally high,” says Pimm, president of the conservation nonprofit organization SavingSpecies.
Source: Brown University