Table 1.
Summary of evidence supporting postulated vicariance events
| Taxon | Percent sequence divergence since
event
|
Data type | |||
|---|---|---|---|---|---|
| Southern gulf | Isthmus of La Paz | Northern gulf | Midpeninsular | ||
| Peromyscus eremicus group | — | — | 8.7 | 3.1 | mtDNA COIII |
| Chaetodipus baileyi group | — | — | 8.7 | 1.8 | mtDNA COIII |
| Chaetodipus arenarius | ? | 12.8 | — | 2.2 | mtDNA COIII |
| Dipodomys merriami group | — | — | — | 4.1 | mtDNA COIII |
| Ammospermophilus leucurus group | — | — | — | 3.3 | mtDNA COIII |
| Bufo punctatus | — | — | 7.5 | — | mtDNA CYTB |
| Neotoma lepida group | — | — | Yes | ? | mtDNA RFLP |
| Toxostoma lecontei group | — | — | — | 2.5 | mtDNA CYTB |
| Pituophis melanoleucus complex | — | — | — | 5.0 | mtDNA ND4 |
| Uta stansburiana group | — | — | — | 5.5 | mtDNA CYTB |
| Urosaurus nigricaudus group | Yes | Yes | — | Yes | Nuclear DNA allozymes |
| Petrosaurus | — | ? | — | Yes | Nuclear DNA allozymes |
Estimates of percent sequence divergence (net average values) (33) among sister groups separated by postulated vicariant event were calculated by using the Tamura–Nei (32) model of sequence evolution (first six this study, remaining three recalculated from studies referenced in Fig. 1 or ref. 43). Yes, evidence available, but calculations of sequence divergence values not attainable given data; ?, postulated but evidence not yet available in sufficient detail. RFLP, restriction fragment length polymorphism; ND4, NADH dehydroxygenase subunit 4 gene.