Separate posts on this blog deal extensively with wolverines in Oregon, Washington , Idaho, Wyoming, Colorado and Utah, Nevada, New Mexico and the Upper Midwest. There are also five posts on the wolverine in California .
A new study using baited trap stations, done during winter, failed to find any California wolverines in either Sequoia or Kings Canyon National Parks in the southern Sierra Nevada. However, in 1980, definite wolverine tracks were seen at two locales in Kings Canyon National Park by trained wildlife biologists. However, tracks always count as “unverified”. But not to me.
I say that at least 28 years ago, wolverines were present in Kings Canyon National Park. Wolverine sightings in California in the past tended to be concentrated in Kings Canyon and Sequoia Parks. This area was long held to be the last stronghold of the wolverine in California. Many detailed sightings were made from 1900-1930 in Sequoia National Park. In one, a wolverine chased two adult bears away from a horse carcass.
The survey utilized many trap stations set in winter for a couple of months. It was designed to test for wolverines persisting at very low densities.
It failed to find any wolverines, and the researchers concluded that the California wolverine is likely extirpated from the Southern Sierra Nevada. Many other recent studies have also failed to find any wolverines.
However, this winter, a wolverine was photographed north of Lake Tahoe by researchers studying pine martens. DNA analysis has subsequently shown that this animal is from the Rocky Mountains and is not a California wolverine. It is not known how this male wolverine got to the northern Sierra Nevada, since the nearest population is in the Snake River Valley in Idaho far to the north.
There are other sightings in Kings Canyon and Sequoia National Parks since 1995. A possible wolverine was heard near the Lodgepole area in Sequoia in 1995. It growled a frightening growl at a passerby from a small hole in some rocks that seemed too small to hold a bear.
On April 19, 2010, a woman reported to park authorities that she saw a wolverine crossing a road in Kings Canyon National Park. She picked a wolverine out of a sequence that also included photos of bear, fox, weasel and beaver as the animal that she saw.
The researchers advocate that wolverines be reintroduced to the Sierras, since they seem to be absent from most of the range.
I believe that California wolverines may continue to persist at very low levels in the Sierras.
In August 2006, there was an unverified sighting of a California wolverine in the Soda Creek drainage northeast of Rainbow Mountain in the Mineral King area of Sequoia National Park.
This part of the Sierra Nevada is a lot drier than the northern part of the Sierra where the wolverine photo was taken recently. According to a topo map I just found, the part of the Soda Creek drainage on the northeast slope of Mt. Rainbow would be very high, at about 10,826 feet. This shows that wolverines may well range above 10,000 feet in the Southern Sierras.
Fishing is banned here to preserve a population of endangered Little Kern Golden Trout. There are also endangered Sierra Nevada Bighorn Sheep in the area. I have seen these sheep in the mountains just outside Los Angeles. A once in a lifetime experience!
In addition, a webpage states that wolverines continue to exist in Mineral King. A backcountry ranger for Sequoia/Kings Canyon National Park said that he was 99% sure that there had been good wolverine sightings in Yosemite and Sequoia/Kings Canyon NP’s as recently as 2003, despite these negative findings.
There have also been sightings on the Sequoia National Forest adjacent to these two national parks and the Sequoia National Monument. According to the study, the last sighting was in 1988. Wolverines have been sighted as far south as Monache Meadows in the Dome Land Wilderness on the Sequoia NF, but the last sighting was in the 1950’s.
However, I recently received a report of a wolverine sighting on the South Sierra Wilderness in Cow Canyon at the 8511 foot level. The sighting occurred in the summer of 2008 on July 19 at 2 PM. The wolverine was sighted on the east side of Cow Canyon about 20 feet from the canyon bottom. This is only 1 1/2 miles east of Monache Meadows at the far southern end of their traditional range. The sighting was by an older man who grew up in national parks and knows wildlife very well. A spreadsheet of the sighting location is here.
The suggestion to reintroduce wolverines to the Sierra is probably the correct one.
The California wolverine as a proven subspecies is still controversial, and it seems to persist at either very low numbers in California or is extirpated altogether. California wolverines continue to exist in Oregon and Washington.
- Graber D.M. 1996. Status of Terrestrial Vertebrates. SNEP Science Team and Special Consultants. Sierra Nevada Ecosystem Project Report 25:709-734.Graber, D.M. 2006. Disturbing Yosemite. California 117:4.Hudgens, Brian R., Garcelon, David K. 2008. Winter Carnivore Survey Finds that Wolverines (Gulo gulo) are Likely Extirpated from Sequoia-Kings Canyon National Parks. Arcata: Institute for Wildlife Studies.
Sequoia National Forest. 2003. Giant Sequoia National Monument Management Plan Final Environmental Impact Statement. United States Forest Service, USDA.