Alpine Newt
Ichthyosaura alpestris
The Alpine Newt is a medium-sized urodele reaching lengths of up to 12 centimeters. During the aquatic breeding season, males exhibit a striking blue coloration on their backs and a silver-white band with black spots along their flanks. Females are more cryptically marbled, but like the males, they possess a bright orange, unspotted belly. They prefer cool, standing water bodies near forested areas and in mid-altitude mountain ranges.
Details
Identification
Unspotted orange belly; males with blue back and white-black flank band; females dark marbled.
Social behavior
Solitary outside the breeding season; forms loose aggregations in water bodies during the spawning period.
Diet
Insect larvae, water fleas, small crustaceans, worms, snails, and occasionally amphibian spawn.
Hunting strategy
Active searching and snapping for prey both in the water and on land (during the terrestrial phase).
Spawning substrate
Aquatic plants, whose leaves are individually folded around the eggs.
Overwintering
Overwintering mostly on land in burrows, under deadwood or stones; occasionally aquatic at the bottom of water bodies.
Ecology
Ecological role
Important predator of invertebrates; serves as prey for birds, snakes, and predatory fish.
Natural predators
Grass snakes, grey herons, mallards, fish (e.g., trout), and diving beetle larvae (for newt larvae).
Competitor species
Other newt species such as the smooth newt and great crested newt, as well as predatory insect larvae.
Ecosystem service
Regulation of insect populations and contribution to nutrient transfer between aquatic and terrestrial systems.
Threats
Habitat loss, fragmentation of migration routes, fish stocking in spawning ponds, pesticides, and the skin fungus Bsal.
Scientific profile
Profile
Distinguishing features
Characteristic features include the unspotted orange belly and the low, yellow-black dotted dorsal crest of males during the breeding season. The bluish base coloration is eponymous (alpestris).
Role in food web
Secondary consumer; regulates invertebrate populations and serves as an important food source for birds, snakes, and larger aquatic insects.
Protection & threats
Main threats
Loss of breeding ponds due to infilling or desiccation, fish stocking in small water bodies, pesticide input from agriculture, and road mortality during migration.
Population trend
Overall stable in Germany, but regionally declining in intensively used agricultural landscapes due to habitat fragmentation.
Conservation measures
Protection and creation of fish-free small water bodies, preservation of deadwood in terrestrial habitats, installation of amphibian tunnels at roads.