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Table 1 Weighted means of the predicted niche occupancy for all environmental variables used in niche modeling and for all species of Xiphophorus included in our analyses. Worldclim variables related to temperature are reported in degrees Celsius and precipitation variables in centimeters. The Hydro1k variables retained for analyses were compound topographic index (CTI), aspect ratio (Aspect), and flow accumulation (FA). The species are grouped by their primary evolutionary clade and by their position in the phylogenetic tree (Fig. 2a). Species present in Fig. 2a but not in the table were not niche modeled due to too few occurrence points. Letters behind the platyfish species names indicate their position relative to the Trans-Mexican Volcanic Belt (TMVB) as north (N) or south (S). All northern swordtails are north and all southern swordtails south of the TMVB, respectively

From: Ecological divergence and conservatism: spatiotemporal patterns of niche evolution in a genus of livebearing fishes (Poeciliidae: Xiphophorus)

   Worldclim variables Hydro1k variables
   Temperature (°C) Precipitation (cm)
Clade Species Bio2* Bio4* Bio5 Bio6 Bio7* Bio13 Bio15* Bio17 Bio18 CTI Aspect FA
Platyfishes X. maculatus 9.9 19.9 33.8 17.7 16.1 37.8 6.5 16.0 48.6 763.6 23247.8 614.1
X. xiphidium 13.7 40.5 34.0 8.4 25.6 14.4 6.9 5.9 25.0 596.0 21391.2 382.3
X. milleri 9.6 19.8 32.5 16.3 16.2 38.8 7.1 13.7 43.4 589.2 19315.2 286.5
X. evelynae 13.7 28.3 29.8 7.0 22.8 27.2 8.1 8.4 44.4 470.0 17405.7 265.1
X. variatus 11.1 33.7 33.8 13.1 20.7 24.6 7.0 10.4 48.7 601.6 15223.5 852.3
X. couchianus 13.2 41.4 32.5 7.2 25.3 13.7 7.0 5.4 23.1 541.9 13603.1 478.7
Northern Swordtails X. pygmaeus 13.2 38.2 35.7 11.2 24.5 26.7 7.5 9.1 44.4 611.8 17190.5 563.4
X. nigrensis 11.4 35.3 35.0 13.3 21.7 23.2 7.8 7.4 40.9 644.2 17252.0 315.2
X. multilineatus 12.4 35.0 35.6 12.9 22.7 25.6 7.5 8.6 41.5 656.2 18054.4 607.0
X. nezahualcoyotl 13.0 32.5 32.6 9.7 22.9 24.0 8.3 6.0 40.2 505.7 12885.8 251.4
X. montezumae 13.2 33.5 32.9 9.6 23.3 23.8 8.5 6.1 42.0 525.1 14558.3 371.4
X. cortezi 11.9 34.2 34.4 12.6 21.8 30.9 6.7 13.5 53.1 619.6 17123.5 754.2
X. birchmanni 13.2 29.5 33.3 11.2 22.1 26.7 7.0 11.2 46.9 543.1 18249.3 267.4
X. malinche 14.6 26.0 30.1 7.0 23.1 22.4 7.6 7.2 34.7 412.4 15254.1 80.8
Southern Swordtails X. monticolus 11.9 19.7 32.9 14.3 18.6 25.9 8.4 6.9 29.0 654.2 19635.7 396.2
X. clemenciae 10.5 19.1 33.8 17.0 16.8 42.9 7.1 17.4 47.3 601.9 17852.3 221.5
X. mixei 11.3 17.2 32.5 15.2 17.3 25.8 8.8 5.8 25.3 564.6 16365.0 206.5
X. hellerii 10.3 18.8 33.1 16.8 16.3 39.1 6.7 17.4 51.4 577.0 17241.4 68.4
X. mayae 9.6 15.3 33.2 18.9 14.3 34.3 6.3 15.5 51.6 759.8 23619.7 1996.3
X. signum 9.2 16.6 32.2 18.0 14.2 32.4 5.1 20.5 56.9 648.5 15546.0 153.6
X. alvarezi 11.6 13.7 31.2 14.7 16.5 34.9 7.2 12.8 49.6 552.4 20222.3 485.8
  1. *Variables are derived as follows:
  2. Bio2 (mean diurnal range): mean of (monthly maximum temperature - monthly minimum temperature)
  3. Bio4 (temperature seasonality): standard deviation of monthly mean temperature multiplied by 100
  4. Bio7 (temperature annual range): maximum temperature in the warmest month - minimum temperature in the coldest month (i.e., Bio5 - Bio6)
  5. Bio15 (precipitation seasonality): coefficient of variation of monthly mean precipitation