An ecogeographic analysis of the herpetofauna of the Yucatan Peninsula ecogeographicana00leej Year: 1980 ^O^ ^ '^ 11 ( 15 : 16 14 \ 12 1 13 H- â ^ 3 '3- nâI Fig. 5.âCluster analysis of 108 grid squares on the basis of presence or absence of snake species. Squares clustered at the level of similarity or higher are united, assigned a number, and cir- cumscribed by a dotted line. On the map a solid line encloses major areas of faunal homogeneity. The cophenetic correlation coefficient is Fig. 6. -Limits of distribution of amphibians and reptiles in the Yucatan Peninsula. Each line
An ecogeographic analysis of the herpetofauna of the Yucatan Peninsula ecogeographicana00leej Year: 1980 ^O^ ^ '^ 11 ( 15 : 16 14 \ 12 1 13 H- â ^ 3 '3- nâI Fig. 5.âCluster analysis of 108 grid squares on the basis of presence or absence of snake species. Squares clustered at the level of similarity or higher are united, assigned a number, and cir- cumscribed by a dotted line. On the map a solid line encloses major areas of faunal homogeneity. The cophenetic correlation coefficient is Fig. 6. -Limits of distribution of amphibians and reptiles in the Yucatan Peninsula. Each line represents the inferred limits for a single species. northwest species drop out and are not replaced. The result is the dramatic faunal attenuation illustrated in Figure 7. The number of frog species dimin- ishes from a maximum of 22 in southern EI Peten, to a minimum of nine at the northwest corner of the peninsula. A less dramatic decrease in species density oc- curs from east to west in the northern third of the peninsula. Lizards and snakes manifest a different species den- sity pattern. For both groups species
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