Appendix D. Robust multiple linear regressions examining the relationship among ant species richness and geographical parameters. Separate results are shown for total ant visitors, LDs (legitimate dispersers), and MB (ants with a mixed dispersal behavior).
|
Assemblage |
|||||||||||||||
Independent variable |
Ant visitors |
LDs |
MB |
Ant dispersers |
||||||||||||
|
R2 |
df |
χ2 |
P |
R2 |
df |
χ2 |
P |
R2 |
df |
χ2 |
P |
R2 |
df |
χ2 |
P |
Elevation |
0.137 |
10 |
0.14 |
0.711 |
0.137 |
10 |
0.14 |
0.711 |
0.273 |
10 |
0.28 |
0.601 |
2.493 |
10 |
2.49 |
0.114 |
Latitude |
0.124 |
10 |
0.12 |
0.724 |
0.124 |
10 |
0.12 |
0.724 |
0.287 |
10 |
0.29 |
0.592 |
2.476 |
10 |
2.48 |
0.115 |
Elevation × latitude |
0.141 |
10 |
0.14 |
0.706 |
|
|
|
|
0.279 |
10 |
0.28 |
0.597 |
2.461 |
10 |
2.46 |
0.116 |
LDs and MB jointly (see Methods).
the low number of cases in relation to the number of parameters in the model precluded the estimation of the interactive effect of latitude and elevation.