Cave salamander

The Cave salamander, scientifically known as Speleomantes strinatii, is a small, fully terrestrial salamander found in the northwestern regions of Italy and the southeastern areas of France. This species is part of the Plethodontidae family, which comprises fully land-based salamanders. While sharing similarities with the Italian cave salamander, S. strinatii is distinguishable by its paler belly.

Description and Physical Characteristics

Cave salamanders exhibit considerable variation in size, with males averaging around 96 millimeters in length and females slightly larger, averaging about 100 millimeters. They can grow up to 116 mm for males and 123 mm for females. The species possesses an oval-shaped head, a rounded snout, and a noticeable overbite, which is more pronounced in males. Their hind limbs are slightly longer than their front limbs, and their hind feet have five digits while their front feet have only four. The coloration of S. strinatii is highly variable, commonly appearing in shades of brown and black. However, individuals can display diverse patterns on their skin, including spots, blotches, or intricate reticular patterns that incorporate colors such as red, yellow, gray, green, or even a metallic sheen.

Habitat and Distribution

This species inhabits a geographical range that spans southeast France and northwest Italy, extending from Alpes de Haute Provence to Northwest Tuscany, and encompassing the Maritime Alps, Ligurian Alps, and Ligurian Apennines. S. strinatii can be found at elevations ranging from sea level up to 2,290 meters, with some observations reaching as high as 2,432 meters in the Maritime Alps. While they are not strictly obligate cave dwellers, they do seek refuge in cooler underground environments, such as caves and crevices, particularly during periods of extreme heat. They prefer humid environments and can be active throughout the year.

Behavior and Reproduction

In their preferred cave habitats, Cave salamanders exhibit limited movement. They display spatial segregation based on age, with juveniles typically residing closer to cave entrances to avoid cannibalistic behavior from older, larger salamanders. Adult males and females have been observed venturing several meters from their caves, while juveniles explore shorter distances. On the forest floor, under favorable conditions, they can move approximately 10 meters per day. Reproduction in the wild is not extensively studied, but sperm transfer occurs through cloacal contact. The mating season is observable, with most pregnant females found in the fall. Captive observations reveal that females lay ivory-white eggs, about 5 to 6 millimeters in diameter, which they guard diligently for up to ten months. During brooding, females coil around their eggs, defending them and sometimes consuming non-developing eggs. The eggs hatch after approximately 45 weeks, and females show significant parental care, remaining in close contact with their young and even transporting them on their backs.

Conservation Status and Threats

The Cave salamander is listed as Endangered by the IUCN Red List due to a declining population size. Key threats contributing to this status include habitat loss driven by residential and commercial development, logging, tourist activities, and urbanization. Climate change and severe weather patterns are also significant concerns, as the species has narrow climatic preferences. Furthermore, the use of biological resources and the presence of invasive species pose additional risks to their survival. Despite these challenges, their skin secretions have shown a remarkable ability to kill certain fungal pathogens, like Batrachochytrium salamandrivorans, which are devastating to other amphibian populations. This natural defense mechanism offers some hope for the species' resilience against microbial threats.