Volume 2, Issue 4
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645


Summary and Conclusions

Cross mating experiments were designed to show whether sexual isolation exists between and .

It was found that a definite barrier to cross mating exists between males of and females of and , between males of and females of and , and between males and females. However, females were fertilized as readily by males as were females.

These results support conclusions drawn from other studies that and are much more closely related to one another than they are to . Sexual isolation could be a secondary result of long geographic separation. There is only a partial barrier between the and and although this might contribute towards a segregation of the two populations, the readiness with which females will mate with males of , even after a long period of geographic isolation, would lead one to suspect that in this case the primary dividing mechanism was not sexual isolation. This isolation would aid, however, in keeping the present-day populations distinct should their ranges overlap.


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