New Clues To Extinct Falklands Wolf Mystery
(Nov. 2, 2009) — Ever since the Falklands wolf was described by Darwin himself, the origin of this now-extinct canid found only on the Falkland Islands far off the east coast of Argentina has remained a mystery. Now, researchers reporting in the November 3rd issue of Current Biology who have compared DNA from four of the world’s dozen or so known Falklands wolf museum specimens to that of living canids offer new insight into the evolutionary ancestry of these enigmatic carnivores.
“One of the big draws for an evolutionary biologist is that this species had a big influence on Darwin‘s ideas about how species evolve,” said Graham Slater of the University of California, Los Angeles, noting that Darwin recognized differences between the East Falkland and West Falkland wolves as evidence that species are not fixed entities. But the wolves’ circumstances were also just downright puzzling.
“It’s really strange that the only native mammal on an island would be a large canid,” Slater explained. “There are no other native terrestrial mammals — not even a mouse. It’s even stranger when you consider that the Falklands are some 480 kilometers from the South American mainland. The question is, how did they get there?”
Possible explanations for the wolves’ presence on the islands, which have never been connected to the South American mainland, range from dispersal by ice or logs to domestication and subsequent transport by Native Americans. Ultimately, the Falklands wolf died out because it was perceived as a threat to settlers and their sheep, although fur traders took out a lot of the population as well.
Biologists have also puzzled over the Falklands wolf’s ancestry. It had been suggested that they were related to domestic dogs, North American coyotes, or South American foxes. Slater said the wolves were the size of a coyote, but much stockier, with fur the color of a red fox. They had short muzzles, just like gray wolves, and thick, wooly fur.
Slater’s team now reports that the Falklands wolf’s closest living relative is actually the maned wolf — an unusually long-legged, fox-like South American canid. The researchers also found that the four Falklands wolf samples that they examined shared a common ancestor at least 70,000 years ago, which suggests that they arrived on the islands before the end of the last ice age and before humans ever made it into the New World. That rules out the prevailing theory that Native Americans had anything to do with their presence on the islands.
“The biggest surprise was that the divergence of the Falklands wolf from its closest living relative, the maned wolf, occurred over 6 million years ago,” Slater said. “Canids don’t show up in the South American fossil record until 2.5 million years ago, which means these lineages must have evolved in North America. The problem is that there are no good fossils that can be assigned to the Falklands wolf lineage in North America.”
Given that maned and Falklands wolves split so long ago, there should be fossils of their close relatives in South America, Slater said. And in fact, the researchers may have a candidate: a species from Patagonia called Dusicyon avus, which went extinct 6,000 to 8,000 years ago. Slater says that’s a possibility that study co-author Alan Cooper at the University of Adelaide in Australia is further investigating now.
Ever since the Falklands wolf was described by Darwin himself, the origin of this now-extinct canid found only on the Falkland Islands far off the east coast of Argentina has remained a mystery. Now researchers have compared DNA from four of the world’s dozen or so known Falklands wolf museum specimens to that of living canids offer new insight into the evolutionary ancestry of these enigmatic carnivores: here.
According to Cope’s rule, lineages tend to evolve towards larger body size, possibly because of selective advantages of being large. The status of Cope’s ‘rule’ remains controversial as it is supported in some but not all large-scale fossil studies. Here, we test for Cope’s rule by Bayesian analyses of average body masses of 3253 extant mammal species on a dated phylogenetic tree. The data favour a model that does not assume Cope’s rule. When Cope’s rule is assumed, the best estimate of its strength is an average ancestor-descendant increase in body size of only 0.4%, which sharply contrasts with the 9% bias estimated from fossil mammals. Thus, we find no evidence for Cope’s rule from extant mammals, in agreement with earlier analyses of existing species, which also did not find support for Cope’s rule: here.
Early dog skull unearthed in Siberia, 33,000-yr old find is early evidence of canine domestication: here.