Table 4 Summary table of the distance based linear model (DistLM) analyses for subterranean fauna.

Sites	Predictor	Adj R²	Proportion	Cumulative Proportion	P
All sites	Site type (cave/spring)	0.047	0.090	0.090	0.002**
	Salinity	0.066	0.061	0.151	0.041*
	Latitude	0.073	0.048	0.199	0.257
Cave sites only	Longitude	0.045	0.119	0.119	0.029*
	Dissolved oxygen	0.074	0.098	0.217	0.052*
	Salinity	0.108	0.097	0.314	0.063
	Acidity	0.138	0.089	0.403	0.129
	Temperature	0.176	0.090	0.493	0.127
Spring sites only	Latitude	0.046	0.165	0.165	0.103
Spring sites only	Dissolved oxygen	0.064	0.133	0.298	0.298

These were constructed using a sequential step-wise selection procedure and adjusted R² criterion.
Significant codes are as follows: 0 < 0.001 ‘***’, 0.001 < 0.01 ‘**’, 0.01 < 0.05 ‘*’. The predictor variables highlighted in bold are significant (P < 0.05). Full DistLM results, including marginal tests and best solutions, are provided in Table S7.

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