troglofauna

Troglofauna is a general term for animals that live in caves and other subterranean environments. It encompasses species that are obligate cave-dwellers, known as troglobionts, as well as those that can inhabit caves but also occur on the surface, called troglophiles. The group is broadly distributed worldwide wherever suitable cave systems occur, with particular richness in karst regions.

Adaptations common to troglobionts include troglomorphic traits such as reduced or absent eyes, depigmentation, and elongated sensory organs or appendages. These organisms tend to have slow metabolisms, extended lifespans, and reproductive cycles suited to the stable but resource-scarce cave environment. Many troglophiles and troglobionts rely on limited food sources that enter caves, such as bat guano, detritus, or subterranean microbial production.

Ecology and diversity: Cave ecosystems host a diverse range of troglofaunal groups, including crustaceans (amphipods, isopods), arachnids (spiders, harvestmen), millipedes, beetles, and specialized worms. Vertebrate troglobionts are less common but include species such as blind cave salamanders and subterranean fishes in some regions, for example the olm (Proteus anguinus). These organisms often exhibit highly localized distributions and endemism tied to individual cave systems.

Distribution and conservation: Troglofauna occur in caves worldwide, with diversity concentrated in limestone and other karst landscapes. They are particularly vulnerable to habitat disturbance, groundwater pollution, and disturbances to cave access. Conservation efforts emphasize protecting cave hydrology, limiting destructive activities near entrances, and maintaining the integrity of subterranean habitats to preserve these specialized communities.