Table 1.

Body length (SL) and sample sizes (N) of males used for the analyses of body colouration and general habitat properties in terms of light availability and turbidity.

Population origin	N	Standard length ± SE	Light availability	Turbidity [NTU]
Arroyo Bonita (AB)	12	42.8 ± 1.8	++	0.0
El Azufre (EA)	9	27.8 ± 0.73	++	67.0–104.3
Cueva del Azufre (CA-II, chamber II)	22	28.9 ± 0.7	o	81.4
Cueva del Azufre (CA-V, chamber V)	40	30.0 ± 0.5	−	45.3–85.0
Cueva del Azufre (CA-X, chamber X)	8	30.1 ± 1.0	−−	39.0–74.6

Light availability is defined as ++: regular surface waters; +: surface water with reduced light availability due to high turbidity; o: cave habitat with dim light available through skylights; −: cave habitat with dim light available only in some areas; −−: perpetually dark cave habitat. Turbidity was measured using a shuttered turbidity probe in nephelometric turbidity units (NTU); data were taken from Tobler et al. (2006) [17].