Koen Alonso et a\ : Food habits of Otana flavescens 



253 



The GO evaluates the probabiUty of obtaining the 

 utihzation curve of each group from the common uti- 

 lization curve of all groups (Petraitis, 1979). This 

 index has a minimum value which depends on the 



sample size and the number of prey species con- 

 sidered. To compare the index obtained from dif- 

 ferent samples, it was adjusted to vary between 

 and 1 (GO^) (Ludwig and Reynolds, 1988). The null 



