Toxic hydrogen sulfide and dark caves: phenotypic and genetic divergence across two abiotic environmental gradients in Poecilia mexicana.
Tobler M, Dewitt TJ, Schlupp I, García de León FJ, Herrmann R, Feulner PG, Tiedemann R, Plath M. Toxic hydrogen sulfide and dark caves: phenotypic and genetic divergence across two abiotic environmental gradients in Poecilia mexicana. Evolution. 2008 Oct; 62(10):2643-59.