Ecology of Subterranean Fishes: An Overview

By E. Trajano. Environmental Biology of Fishes, 2001

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Towards a biologically meaningful classification of subterranean organisms: a critical analysis of the Schiner-Racovitza system from a historical perspective, difficulties of its application and implications for conservation (2017, background): “…in population sizes and densities are even observed within the same species, as in the troglobitic armored catfish, Ancistrus cryptophthalmus; Trajano 2001a, E Trajano pers. obs. in the 2000´s) Another pitfall in the application of Schiner-Racovitza classification is borne from the fact…”
The role of sexual harassment in cave and surface dwelling populations of the Atlantic molly, Poecilia mexicana (Poeciliidae, Teleostei) (2003, background): “Unlike most caveecosystems, the Cueva del Azufre appears to be energyrich (Langecker et al. 1996), allowing for very high population densities of 100–200 individuals per square meter (Parzefall 1993), which is unusual for cave-fishes (e.g. Trajano 1997, 2001).”
The end of regressive evolution: examining and interpreting the evidence from cave fishes. (2005, background): “Such widespread genetic variation for phenotypic plasticity can help explain why, for example, cave populations of A. fasciatus only in the San Luis de Potosı́ area develop troglomorphisms while those in Yucatán, Belize, Costa Rica, and Brazil do not.”