436 



Nim-mitive Species — Our Livint^ Resources 



The ability to assess impacts of exotics on 

 native species may be related, in part, to the 

 length of time that the exotic has been estab- 

 lished. For example, deleterious impacts by the 

 brown tree snake on Guam were not noticed by 

 biologists until about 25 years after initial colo- 

 nization (Savidge 1987). Thus, short-term stud- 

 ies of many non-native reptiles and amphibians 

 may not reveal impacts on native biota. Of the 

 five long-term infestations discussed earlier, 

 only the African clawed frog seems to have not 

 affected the native vertebrate biota. The four 

 detrimental case studies suggest, however, the 

 trend that introduced reptiles and amphibians, 

 like many other introductions, negatively affects 

 established biota. Importantly though, popula- 

 tions of most introduced species of reptiles and 

 amphibians remain unstudied and long-term 

 effects are largely unassessed. 



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