Epi-hypogean distribution of the studied species, corrected for geological basement.

<p>Epi-hypogean distribution of the studied species, corrected for geological basement.</p

Summary of all results.

<p>¹ Numbers rang species pairs according to the similarity of the species ecological niche: 1- little difference, 6—maximum differences.</p><p>² All species exhibit a clumped distribution (see <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0134384#pone.0134384.t004" target="_blank">Table 4</a>).</p><p>Summary of all results.</p

BioClim variables used in modelling the bioclimatic niches.

<p>0.7, 0.8, 0.9 refer to threshold of the maximum correlation (Spearman’s rank) between BioClim variables value beyond which the data were considered as independent.</p><p>*Isothermality = [Mean Diurnal Range (Mean of monthly (max temp–min temp)) / Temperature Annual Range]</p><p>BioClim variables used in modelling the bioclimatic niches.</p

Distribution of focal species and the studied area (the Istrian Peninsula).

<p>The inset map indicates the geographic position of the study area within Europe. Species presence records were superimposed on a SRTM Shaded Relief (Central North) layer available from ESRI.</p

Species`differences in morphological traits related to feeding biology.

<p>*diagnostic character between <i>N</i>. <i>krameri</i> A and <i>N</i>. <i>krameri</i> B.</p><p>Species`differences in morphological traits related to feeding biology.</p

Bayesian phylogenetic trees of the focal species complexes using concatenated alignments for 28S and COI gene fragment.

<p>The numbers on nodes indicate posterior probabilities for Bayesian trees and bootstrap support values for maximum likelihood trees. Patristic, K2P and uncorrected p-distances between A and B species within <i>N</i>. <i>krameri</i> and <i>N</i>. <i>spinulifemur</i> are 0.34, 0.14, 0.12 and 0.36, 0.19, 0.16, respectively. Coloured dots at some terminals indicate localities of co-occurrences with the respective species. The species are: <i>Niphargus krameri</i> A (NKA, red), <i>Niphargus krameri</i> B (NKB, blue), <i>Niphargus spinulifemur</i> A (NSA, green), and <i>Niphargus spinulifemur</i> B (NSB, yellow).</p

Evidence for clumped distribution of focal species.

<p>* NN Ratio = observed mean distance/expected mean distance, if NNR<1 then distribution is clumped, if NNR>1 then distribution is equally dispersed.</p><p>Evidence for clumped distribution of focal species.</p

Ecological similarity between species pairs along individual niche axes and the joint niche.

<p>¹Overall morphological similarity calculated from <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0134384#pone.0134384.t002" target="_blank">Table 2</a>, normalized values.</p><p>²Difference in preference for surface habitats, normalized values.</p><p>^{0.7, 0.8, 0.9} The values denote maximum Spearman’s rank correlation between BioClim variables allowed in calculation of Schoener’s D index. For calculations of the joint niche values of D index were standardized.</p><p>*A statistically significant difference in values of selected BioClim variables for the species pair.</p><p>Ecological similarity between species pairs along individual niche axes and the joint niche.</p