Cheat Mountain salamander

Cheat Mountain salamander
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Subphylum: Vertebrata
Class: Amphibia
Order: Caudata
Family: Plethodontidae
Genus: Plethodon
Species: P. nettingi
Binomial name
Plethodon nettingi
(Green, 1938)
For the heritage railroad, see Durbin and Greenbrier Valley Railroad.

The Cheat Mountain salamander (Plethodon nettingi) is a species of small, threatened woodland salamander found only on Cheat Mountain, and a few nearby mountains, in the eastern highlands of West Virginia. It and the West Virginia spring salamander (Gyrinophilus subterraneus) are the only vertebrate species with ranges restricted to that state.

The Cheat Mountain salamander (CMS) has decreased in population due to destruction of its original red spruce forest habitat, as well as by pollution, drought, forest storm damage, and by competition with other salamanders, especially its relative, the red-backed salamander (P. cinereus).

Description

The CMS is smallish, similar in size to the red-backed salamander (3 to 4¾ inches, or 7½ to 12 cm), but is distinct in its black or dark brown dorsum (back) which is boldly marked with numerous small brassy, silver or white flecks. It lacks a dorsal stripe. The belly is dark gray to black. The tail is about the same length as its body, which has 17 to 19 costal grooves (vertical grooves along its sides).

Taxonomy

The CMS was discovered by M. Graham Netting and Leonard Llewellyn on White Top, a summit of Cheat Mountain in Randolph County in 1935. It was described (and named) by N. Bayard Green in 1938.[1] This salamander and the Peaks of Otter salamander (P. hubrichti), which has a similarly restricted range in Virginia, were once considered subspecies of a single species -- Netting's salamander—but since 1979 they (along with the Shenandoah salamander, P. shenandoah) have been considered separate, full species. Their ranges were both probably much larger in the past. (The circumstances surrounding the discovery and formal description of the CMS are related by Maurice Brooks in his classic natural history book, The Appalachians (1965).)

Range

The CMS is restricted to a small portion of the high Allegheny Mountains in eastern West Virginia. Initially, in the 1930s and '40s, its range was thought to be limited to Cheat Mountain at elevations above 3,500 feet (1,100 m) in Randolph County — and in Pocahontas County, where it was also found at Thorny Flat (Cheat's highest point). Later inventories, conducted in the 1970s and ‘80s, expanded the known range to include Pendleton and Tucker Counties (e.g., Backbone Mountain, Dolly Sods). More recently, the range has been shown to include the eastern edge of Grant County where it is found as low as 2,640 feet (800 m) elevation. Most populations are found above 3,500 feet (1,100 m). The entire CMS range encompasses only about 935 square miles (2,420 km2), but not continuously throughout even this area (about 60 isolated populations are known). Much of this range is within the Monongahela National Forest.

Habitat

Originally, the CMS was probably restricted to red spruce forests of West Virginia's higher mountains. Most of these forests were cut down by 1920, and so several populations today occur in mixed deciduous forests that have replaced red spruce stands. These include yellow birch, American beech, sugar maple, striped maple and eastern hemlock trees. The salamander’s occurrence, however, is not dependent upon any particular type of vegetation, but is often associated with boulder fields, rock outcrops, or steep, shaded ravines lined with a dense growth of rhododendron. It is more abundant adjacent to large emergent rocks where soil and litter are more moist and cooler than the surrounding hillsides. It may be that they were protected in these refugia (emergent rocks) when the original forests were cut and in some areas burned. Typically, they are found where the ground cover consists of bryophytes (mosses, liverworts, etc. -- especially the liverwort Bazzania) and an abundance of leaf litter, fallen logs and sticks.

Diet

Like other woodland salamanders, the CMS subsists on mites, springtails, beetles, flies, and ants. On moist evenings it searches the forest floor, rocks and logs for food. It will occasionally climb trees, shrubs and stumps in pursuit of a meal.

Behavior and reproduction

CMSs spend the winter underground where temperatures remain above freezing. Depending on soil temperature, they emerge from winter refugia at the end of March or early April and retreat to underground refugia again in mid October. During the above ground period, they are especially active at night in humid weather. During the day, they remain under rocks and in or under logs; and sometimes among wet leaves. Aestivation only occurs during unusual drought conditions.

The Cheat Mountain salamander.

The breeding behavior of CMSs has not been directly observed, but most likely occurs on the forest floor. Pairs of males and females have been found together under rocks in both spring and autumn and both sexes during these months are in breeding condition: males with swollen cloacas and squared-off snouts, females with mature follicles. Nesting activities are similar to the red-backed Salamander. The female typically lays 8 to 10 eggs (minimum 4; maximum 17) which are attached to the inside of a rotten log or the underside of a rock or log in either red spruce or deciduous forests. Females attending small clusters of eggs have been found from late April through early September. The female apparently guards the eggs until they hatch (a behavior unique to salamanders of the woodland salamander family, Plethodontidae). The young undergo their larval stage within the egg so that they resemble small adults when they hatch in late August or September.

The juveniles reach sexual maturity in 3 to 4 years and live for approximately 20 years. The young may remain in the same area as the adults until they become mature at which time they move away and establish their own territories. Territories are about 48 square feet (4.5 m2) in area. Woodland salamanders seldom leave their territories and, as a result, move only a few meters during their lives.

Conservation

Populations of the CMS probably plummeted when its original habitat (red spruce forests) was destroyed by logging in the early 20th Century. It is now on the U.S. Endangered Species List and it has been protected under the Federal Endangered Species Act since 1989. Any disturbance exposing the forest floor to sunlight changes the cool, moist conditions on which these animals depend for nest sites as well as food and respiration. Alterations as minor as clearing service roads or hiking or skiing trails can fragment and isolate populations since these salamanders do not cross bare surfaces. As populations become divided, gene pools decline as does the likelihood of viability. Such habitat alterations probably also favor the encroachment of mountain dusky and red-back salamanders which out-compete the CMS for food, cover and moisture.

Fortunately, much of the CMS’s range (46 of 60 known populations) falls within the Monongahela National Forest. A recovery plan was developed for the U.S. Fish and Wildlife Service (USFWS) and annual surveys are conducted by Thomas Pauley (Marshall University), an authority on this species, and he indicates that its numbers appear to be stable except where habitats have been altered. The West Virginia Division of Natural Resources has also conducted population monitoring and surveys. Since both the salamander and its habitat are monitored and protected in the National Forest and the Canaan Valley National Wildlife Refuge, its future looks hopeful.

References

Citations

  1. ↑ Green, N.B. (1938). "A New Salamander, Plethodon nettingi, from West Virginia". Annals of the Carnegie Museum. 27: 295–299.
Wikispecies has information related to: Cheat Mountain salamander

Other sources

Photos

Range map

This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.