Skip to main content

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