Order Caudata Genus Plethodon Higher classification Woodland salamander | Phylum Chordata Family Plethodontidae Scientific name Plethodon cinereus Rank Species | |
Similar Woodland salamander, Salamander, Amphibians, Lungless salamander, Spotted salamander | ||
The red backed salamander
The red-backed (or redback) salamander (Plethodon cinereus) is a small, hardy woodland salamander. It inhabits wooded slopes in eastern North America, west to Missouri, south to North Carolina, and north from southern Quebec and the Maritime Provinces in Canada to Minnesota. It is also known as the eastern red-backed salamander or the northern red-backed salamander to distinguish it from the southern red-backed salamander (Plethodon serratus). It is one of 55 species in the genus Plethodon.
Contents
- The red backed salamander
- Reptiles amphibians invertebrates small pets red backed salamander facts
- Description and ecology
- Behavior
- Reproduction and biomass
- References
Reptiles amphibians invertebrates small pets red backed salamander facts
Description and ecology
The red-backed salamander is a small (5.7 to 10.0 cm) terrestrial salamander which usually lives in forested areas under rocks, logs, bark, and other debris. It is one of the most numerous salamanders throughout its range. The red-backed salamander exhibits color polymorphism and two color variations are common: the 'red-backed' or 'red-stripe' variety has a red dorsal stripe that tapers towards the tail, and the darker variety, known as the 'lead-backed' (or simply 'lead') phase, lacks most or all of the red pigmentation. The red-backed phase is not always red, but may actually be various other colors (e.g., yellow-backed, orange-backed, white-backed, or a rare erythristic morph in which the body is completely red). Both morphs have speckled black and white bellies.
The skin of red-backed salamanders was found to contain Lysobacter gummosus, an epibiotic bacterium which produces the chemical 2,4-diacetylphloroglucinol and inhibits the growth of certain pathogenic fungi.
Behavior
Antipredator behavior was found to differ between the two color phases; the lead-backed phase has a tendency to run away from predators, whereas the red-backed phase often stays immobile and possibly exhibits aposematic coloration. Stress levels of each color phase were estimated by determining the ratio of neutrophil to lymphocyte cells in the blood, and the results suggest stress levels are higher in the lead-backed phase than in the red-backed phase. This may be a consequence of a higher predation risk experienced in the wild by the lead-backed phase, and may also mean lead-phase salamanders could be more vulnerable in captivity settings.
Reproduction and biomass
Males and females typically establish separate feeding and/or mating territories underneath rocks and logs. However, some red-backed salamanders are thought to engage in social monogamy, and may maintain codefended territories throughout their active periods. Breeding occurs in June and July. Females produce from four to 17 eggs in a year. The eggs hatch in six to eight weeks. Not much is known about the dispersal of neonates, although neonates and juveniles are thought to be philopatric. The species largely consumes invertebrates and other detritus dwellers. In some areas with good habitat, these salamanders are so numerous, their population densities may surpass 1,000 individuals per acre.