October 20, 2019

Ancient Wolf Genome Reveals an Early Divergence of Domestic Dog Ancestors and Admixture into High-Latitude Breeds: Current Biology

The closest living relative of domestic dogs is the gray wolf, Canis lupus , but the number of domestication events, as well as their antiquity and geographical origin, is highly contentious. While molecular estimates of the time of origin of the dog lineage are contingent on principally unknown mutation rates and generation times, the most recent genomic estimates of the divergence between wolves and dogs date to 11,000 to 16, 000 years ago. These estimates are in considerable discord with reported archaeological evidence of dog-like canids from before the Last Glacial Maximum, which date as far back as 36,000 years before present (BP). Furthermore, a recent study showed that gray wolves from as disparate locations as China, Israel, and Croatia were symmetrically related to modern-day dogs. This observation suggests that dogs were domesticated prior to the diversification of present-day gray wolf populations or that the wild ancestors of dogs are now extinct. The latter scenario would be consistent with an earlier finding of a morphologically distinct wolf population adapted to megafaunal prey in Late Pleistocene Beringia, as well as mitochondrial DNA evidence for a Holocene replacement of European gray wolves. One hypothesis could thus be that the wild ancestors of dogs were a genetically distinct wolf population that inhabited the Late Pleistocene steppe-tundra biome and that this population was subsequently replaced, possibly by a northward postglacial expansion of smaller-bodied wolves that gave rise to modern-day wolf diversity. To test this hypothesis, we sequenced a draft genome of a Late Pleistocene wolf from northern Siberia.

Source: Ancient Wolf Genome Reveals an Early Divergence of Domestic Dog Ancestors and Admixture into High-Latitude Breeds: Current Biology

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DNA Studies – Smaller Native Wolves Existed in Northern Rockies before Canadian Wolf Transplant

By George Dovel (Republished with Permission)

In the Jan-Mar 2008 Outdoorsman Bulletin No. 26, the lead articled titled, “What They Didn’t Tell You about Wolf Recovery,” described the ongoing deception by federal and state biologists in their scheme to fill rural areas in the lower 48 states with wolves.

The article referred to 20 years of Dept. of Interior Solicitors (lawyers) changing the number of N. American wolf subspecies covered in the Endangered Species Act from 24, finally to two and back to four – and then to any or all wolves called “gray wolves” or “Canis lupus”. Then it told how FWS reclassified ESA-listed wolves as members of two “Distinct Population Segments”, which it later changed to three until a federal judge denounced the obvious attempt to circumvent the ESA.

The ongoing debate between wildlife scientists who classify species, concerns whether subspecies of elk (red deer), North American bison, grey wolves, etc., exist. Bona fide expert taxonomists include Dr. Valerius Geist who points out that changes in location, habitat, size and appearance alone do not necessarily change the genetic make-up to qualify an animal as a separate sub-specie.

However the Northern Rocky Mountains wolf subspecies – C. l. Irremotus – was documented by physical comparisons of skulls, etc., from larger wolves in 1959:

Page 2 of the 146-page FWS Northern Rocky Mountain Wolf Recovery Plan dated August 3, 1987, contains the map showing the historical distribution of Canis lupus Irremotus in the lower 48 states, plus the 1987 distribution in black. It depicts immigration of Irremotus from southern British Columbia into Idaho and from B.C. or southern Alberta into the northwest corner of Montana.

It also shows the two 1987 Irremotus population areas in central Idaho, one of which included the three wolf pack territories mapped by Tim Kimmery between 1988 and 1991 (see Outdoorsman Bulletin No. 35).

Historical Impact on Wolf Subspecies

During the most recent (Pleistocene) ice age, water evaporating from the oceans became part of the glacial ice covering the land. Ocean levels dropped 300 feet or more and the Bering Strait between Siberia and Alaska dried up.
The exposed land bridge with little snow, later named Beringia, became a refuge for hardy Siberian animals and plants for several thousand years (see below).

Many scientists believe Beringia included a small human population from Siberia that was prevented from continuing into North America for 5,000 years by the North American ice sheets. Geologists report these continental ice sheets were 5,000-10,000 feet in depth and extended south in some places to the 40th Parallel below what is now the U.S.-Canadian border.

The artists’ three views of Beringia published by “Wikipedia” illustrate the changes that have occurred in the “Bering Land Bridge” during the last 18,000 years. But there is still disagreement among biologists about when, where and how several current mammal species first arrived on the North American Continent.

Subspecies Had Limited Opportunity to Crossbreed

Since 1995 a number of wildlife biologists have accepted the determination by Nowak that five subspecies of gray wolf (Canus lupus) inhabited North America during the early 20th Century. There is also agreement that Canis lupus occidentalis (the large gray wolf transplanted to Yellowstone and Central Idaho by FWS in 1995) had virtually no opportunity to influence the genetic make-up of coastal wolves in SE Alaska and Yukon and portions of five other Canadian Provinces where it existed.

For thousands of years the ice between interior Alaska, Yukon and British Columbia and the coastal area prevented the occidentalis wolves from mixing with the smaller wolves defined as C. lupis ligoni by Goldman in 1944. And the intensive efforts to kill all wolves in the early 1900s also left few of the large wolves alive in most areas where they might have mixed with the native wolves.

The map below in the study titled, “Legacy Lost: genetic variability and population size of extirpated U.S. gray wolves (Canis lupis),” published by Leonard et al in the 2005 Vol. 14 issue of Molecular Ecology, shows the five primary subspecies that existed in the early 1900s. The bold black line indicates the northern limit of gray wolf eradication that occurred in the 48 contiguous United States and Canada.

In 1995, C.l. nubilus, the primary subspecies common in the U.S. and Canada mainland included ligoni from the west coast of Canada, irremotus from the Northern Rocky Mountains and labradorius from Labrador. The “a” to “z” letters scattered on the map represent original locations of the various museum specimens whose DNA were recorded in the study.

A similar study titled, “Phylogeography of wolves (Canis lupus) in the Pacific Northwest”, by Weckworth et al (published in the 2010 (2) issue of the Journal of Mammology) used basically the same map, along with an expanded inset to illustrate locations of testing for the genetic difference between the smaller coastal wolves and the 30% larger occidentalis wolves from the Alaska and Yukon interiors.

Both of these DNA studies emphasize that the nubilus wolves migrated northward to populate Canada as the ice sheets and glaciers melted. They point out that the smaller wolves existed in the south before the larger wolves migrated into northern Canada, and the Weckworth study suggests the coastal wolves should be listed as a separate individual subspecies.

Court Allows Transplants – Then Orders Removal

Readers who actively opposed the FWS option to import Canadian wolves may recall the following events:
In 1994 the Farm Bureau, Audubon Society and other plaintiffs asked the Wyoming Federal District Court to halt wolf introduction because it could not legally occur where naturally occurring wolves already existed per the 10J Rule. But instead of issuing an injunction to halt the process while the arguments were presented, Judge Downes allowed FWS to go ahead and transplant Canadian wolves into Central Idaho and Yellowstone Park for three years until he issued his ruling in December of 1997.

Then after setting aside the final wolf introduction rules as unlawful, Judge Downes ordered FWS to remove all Canadian wolves and their progeny from both experimental population areas. This ruling was met with loud criticism by the wolf activists, including the state and federal wildlife agencies who apparently believed they could get by with ignoring both state and federal laws when it suited their agenda.

Judge “Passes the Buck” to Appeals Court

They quickly pointed out that it would not be possible to even locate most of the wolves – much less capture them. But even if that were possible, both Canadian Provinces refused to allow the wolves to return and there were not enough zoos willing to accept several hundred wild wolves so killing most was the only option.

Judge Downes could have prevented this disaster from occurring by simply putting wolf introduction on hold three years earlier until his decision was reached. But the second time he did essentially the same thing by later staying execution of his removal order pending an appeals decision by the 10th Circuit Court.

On January 13, 2000, five years after the first large Canadian wolves were introduced, the Tenth Circuit Court of Appeals overturned the December 1998 Wyoming District Court ruling that the reintroduction program was unlawful and should be revoked. The appeals court admitted that the evidence showed native irremotus wolves already existed when the larger Canadian wolves were introduced, but said FWS had the authority to determine what constituted a population.
The fact that the resident wolves coexisted with abundant big game populations and with negligible impact on livestock and human activity was already a matter of record in 1994. But on August 12, 1994, FWS Wolf Leader Ed Bangs sent a letter to Charles Lobdell telling him to stop issuing statements to the public advising that the number of reported resident wolves was increasing.

Bangs’ letter advised that FWS planned to introduce wolves from Canada and said: “From this day forward…confirmed wolf activity (will only include) individual wolves or members of packs that have been examined, radio-collared and monitored in the wild.” He also said he had transferred $9,000 to the FWS Boise Field Office to search for wolves and organize flights to locate any radio-collared wolves that might be in Idaho or the Yellowstone area during the summer and fall.

Bangs also included key issues to be presented to the public consistently by FWS:
“1. (I)t is likely that wolf populations would ultimately recover without reintroduction and breeding pairs of wolves would likely occur in Idaho before they would occur (in) Yellowstone.

4. Experimental populations will not knowingly contain a significant portion of the territory of any naturally occurring breeding pair that has successfully raised young. However once wolves are released all wolves in the area will be treated as experimental animals.”

Despite reported wolf sightings by more then 120 outfitters, trappers and others in less than two months, most in the same location where Kemery mapped three wolf pack areas from 1988-1991, and despite the USFS road closure to protect existing wolves (see Bulletin 35), Bangs dumped Canadian wolves halfway between the two known native wolf locations guaranteeing their extermination.

In February of 2012, I forwarded the Weckworth DNA study, without comment, to Dr. Valerius Geist. The following was his reply:

“Thank you, George, I have seen this study. To me it suggests that there was indeed a remnant of native wolves in Idaho that were finally done away with by introduced wolves from Canada. The native wolves would have been of the same clad as the coastal wolves. Anyway, that’s testable since some museum specimens of native Idaho wolves are still available for genetic analysis. However, somebody competent and trustworthy needs to do it. Cheers, Val Geist.”

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Wolves in Maine in the 1800s – Part III (First Recorded Attacks on Humans)

Part I
Part II
Part III
Part IV
Part V
Part VI

The book, Early Maine Wildlife – Historical Accounts of Canada lynx, Moose, Mountain Lion, White-Tailed Deer, Wolverine, Wolves, and Woodland Caribou, 1603 – 1930 – by William B. Krohn and Christopher L. Hoving, is proving to be an interesting addition to my library. I think the authors did a decent job of putting this information together; one, to make it readable, and, two, to give a reader a sense of the changes taking place across the lands over extended periods of time. I am glad they chose to list the entries in chronological order. Of course these changes come with no real explanations from the observers, often just recalling what it used to be like.

In 1860, J.G. Rich writes in the Bethel Courier about his hunts for caribou. He also explains that he has shot and killed two caribou in the previous 6 years and then states, “many hunters from different parts of the State have told me that the species [caribou] are almost extinct in Maine”. Obviously Rich wasn’t into conservation of wildlife, which most of us know came a bit later on after it was decided something needed to be done.

Henry David Thoreau relates the reports he got from lumbermen and hunters in the mid-1800s through the late-1800s. In 1858 he writes, “The lumberers told me that there were many moose thereabouts, but no caribou or deer.”

It was in 1860 when M.R. Keep told the tale of when the French first settled in the Madawaska area in Northern Maine, along the St. John River, the Indians got angry because the French were killing their moose and caribou. The story goes that the Indians, out of spite, slaughtered all the moose, and, “For twenty years or more, not a moose was seen or heard from in all Northern Maine or the adjoining borders of New Brunswick[.]”

However, wolves were still an often talked about species. Thoreau often spent time “listening” throughout his travels in Maine to hear the wolves howl. While people howled about the threats and utter destruction the animal caused.

It was in 1855 that C. Hardy wrote about what he knew of the grey wolf.

“The gray wolf (Canis lupus) has but lately made its appearance in Nova Scotia, not as in other provinces, however, in company with his prey, the Canadian deer (Cervus virginianus). The gray wolf is a large, fierce, and powerful animal. In Maine and New Brunswick, several instances have been known of his attacking singly and destroying a human being. This animal sometimes grows to the length of six feet. The hair is long, fine, and of a silver grey. A broad band of black, here and there, showing shiny silvery hairs, extend from the head down the back. The tail is long and bushy, as the brush of a fox. A wolf skin forms a frequent decoration for the back of a sleigh.”

This is the first I have read in this book (although I am barely past page 100 of 500) of reports of wolves attacking and killing people. I should point out that in reading accounts of wolves beginning in the very early 1600s, most descriptions of wolves up to this point related that they were wary of humans and for the most part steered clear. While there were also reports of some savagery of wolves on livestock, the number of those reports paled in comparison to the accounts of how the wolves feed on available wild prey, such as deer, moose, rodents, etc.

At this juncture, it appears that we may be actually seeing a pattern take place. As the reports from observers seem to be passing on the reduction of game animals and in some cases the lack thereof, i.e. the extinction of the caribou, incidents of livestock kill and now reports of attacks on humans are on the increase.

In 1842, Z. Thompson, in his “History of Vermont”, writes about “The Common Wolf”.

“For some years after the settlement of this state was commenced, wolves were so numerous and made such havoc of the flocks of the sheep, that the keeping of sheep was a very precarious business. At some seasons particularly in the winter they would prowl through the settlements at night and large companies, destroying whole flocks in their way, and, after drinking their blood and perhaps eating a small portion of the choicest and tenderest parts, would leave the carcasses scattered about the enclosure and go in quest of new victims. Slaughter and instruction seemed their chief delight; and while marauding the country they kept up such horrid and prolonged howlings as were calculated, not only to thrill terror through their timorous victims, but to appall the hearts of the inhabitants of the neighborhood. Though sheep seems to be their favorite victim, wolves sometimes destroyed calves, dogs, and other domestic animals; and in the forest they prey upon deer, foxes, hares and other such animals as they can take. Impelled by hunger they have been known in this state to attack persons.”

Here is another account of attacks on people. And also notice that the indicator in the statement about attacks on people is, “Impelled by hunger”. If the accounts being recorded have much accuracy at all, we see that for what may be multiple reasons, the prey base for wolves is diminishing. This increases the incidents of livestock depredation and attacks on humans. I believe it only correct to make that assumption, knowing what we do about wolf behavior.

In addition, this account of Thompson’s, gives us our first glimpse into surplus killing or sport killing that protectors of predators such as the wolf and coyote so readily deny. Thompson describes the wolves’ actions as being anything but savage and pointless. Why has it been 150 years before these kinds of reports are showing up?

I am curious as to whether readers are surprised to learn of these incidences by wolves in Maine – their savagery of livestock and attacks on humans? I would guess they are, as they have been indoctrinated to believe that there has never been an attack on a human by wolves in the lower 48 states. These early observers and recorders of wildlife from the early 1600s, seem to have a differing set of facts.

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