AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |
Back to Blog
California fox sounds2/12/2024 A relatively restricted and narrow hybrid zone between Sacramento Valley red and non-native foxes has been stable for several decades, despite the five-fold expansion of non-native red fox populations throughout the rest of lowland and coastal California. Genetic studies beginning in 2010 have also shown the Sacramento Valley red fox ( Vulpes vulpes patwin) is a distinct subspecies more closely related to the Sierra Nevada red fox than introduced lowland red foxes present in the rest of California. The Lassen and Sonora Pass populations are isolated from each other and it is unknown if a population remains at Mount Shasta. Rediscovery of the Lassen population began in 1993 followed by detection of a Sierra Nevada population at Sonora Pass in 2010 and rediscovery of the Oregon Cascades population began in 2011. Study then lapsed for approximately 60 to 75 years, depending on location. Joseph Grinnell identified separated montane fox populations in the Oregon Cascades, Mount Shasta, Lassen Peak, and Sierra Nevada in 1937. Sierra Nevada red foxes are one of three fox subspecies in the montane clade of North America, occurring in the Cascade Mountains south of the Columbia River and California's Sierra Nevada range. Research 2014 reappearance in Yosemite after nearly 100 years Discovery and rediscovery Non-invasively monitored females have either not bred or bred a minority of years. Sierra Nevada red foxes are relatively long-lived compared to other red foxes, typically living five to six years. Their foot pads are fur-covered, a common adaptation to travel over snow. All three phases occur in the Oregon Cascade and Sonora Pass populations, but only red phase individuals have been found in the Lassen population. Their fur may be red, cross, or silver phase with the red phase having the greyish-blonde coloration characteristic of montane foxes. Like other montane foxes, Sierra Nevada red foxes are somewhat smaller and lighter in weight than lowland North American red foxes. This subspecies of red fox may live up to 6 years. The High Sierra fox was discovered as a subspecies in 1937, but its study lapsed for more than half a century before its populations were rediscovered beginning in 1993. The High Sierra fox shares most of its physical characteristics with the red fox, though it is slightly smaller and has some special adaptions for travel over snow. It is likely one of the most endangered mammals in North America. The Sierra Nevada red fox ( Vulpes vulpes necator), also known as the High Sierra fox, is a subspecies of red fox found in the Oregon Cascades and the Sierra Nevada. No satisfactory theory has ever been broached to explain these noises.Sierra Nevada red fox historical range and recent sightings The lake seems to be speaking to the surrounding hills, which send back the echoes of its voice in accurate reply. “The report is deep, hollow, distant and imposing. “It is a sound resembling the explosion of a heavy piece of artillery that can be accounted for by none of the known laws of nature,” he wrote. On the East Coast, enigmatic booms are known as “Seneca Guns,” the name drawn from a lake in upstate New York that was the setting for an 1850 short story, “The Lake Gun,” by James Fenimore Cooper. But unexplained loud, shaking noises are the most common, sometimes falling under the general term “skyquakes.” Thirty years ago, thousands of San Diegans were drawn to what some believed was the apparition of a slain girl on a blank billboard in Chula Vista. “Mysterious Shaking Rattles San Diego County AGAIN,” the website Strange Sounds trumpeted in a headline this week. The region joined a list of communities from coast to coast that are defined in part by unexplained goings-on.
0 Comments
Read More
Leave a Reply. |