An ecogeographic analysis of the herpetofauna of the Yucatan Peninsula ecogeographicana00leej Year: 1980 YUCATAN HERPETOFAUNA 25 Table 7.âSummary of results of multiple regression analysis of ecological variables and numbers of species of amphibians and reptiles in the Yucatan Peninsula. Amphibians Snakes Lizards Step Variable entered R2 Step 1 2 3 4 Variable entered PHD PCTRN SVD PVD R2 Step 1 2 3 4 Variable entered R2 1 2 3 ANRN PCTRN SVD PVD PCD PCTRN ANRN 22 - 1 1 1 -1 El Celbal ⢠/ 21 â Poptun » / , jikai - 20 â /⢠La Libertad '
An ecogeographic analysis of the herpetofauna of the Yucatan Peninsula ecogeographicana00leej Year: 1980 YUCATAN HERPETOFAUNA 25 Table 7.âSummary of results of multiple regression analysis of ecological variables and numbers of species of amphibians and reptiles in the Yucatan Peninsula. Amphibians Snakes Lizards Step Variable entered R2 Step 1 2 3 4 Variable entered PHD PCTRN SVD PVD R2 Step 1 2 3 4 Variable entered R2 1 2 3 ANRN PCTRN SVD PVD PCD PCTRN ANRN 22 - 1 1 1 -1 El Celbal ⢠/ 21 â Poptun » / , jikai - 20 â /⢠La Libertad ' 19 ⢠/ 18 - / 17 - Xpujil ⢠/ â 16 â / â 15 Sanfa Rosa / â 14 ⢠/ â 13 â / ⢠Tunkas 1 84 108 132 156 180 MEAN ANNUAL RAINFALL (cm) Fig. 16.âRegression of amphibian species den- sity on mean annual rainfall for seven study sites in the Yucatan Peninsula. The regression equation is Y = + ; r = .944; p<.01. ^ La Libertad 24 - ⢠Poptun 08 16 PLANT HEIGHT DIVERSITY Fig. 17.âRegression of snake species density on plant height diversity for seven study sites in the Yucatan Peninsula. The regression equa- tion is Y = + ; r = .814; p/⢠Santa Rosa - /⢠Xpujil ⢠La Libertad ⢠Poptun PLANT VOLUME DIVERSITY Fig. 18.âRegression of lizard species density on plant volume diversity for seven study sites in the Yucatan Peninsula. The regression equa- tion is Y = -1- ; r = .864; p<.05.
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