NO. 3595 ANOLIS LINEATOPUS — RAND 31 



In the Mona hibiscus hedge studied from April 10 through June 1 there were 

 10 small males. Of these, 4 changed their activity ranges and the other 6 re- 

 mained roughly the same. 



The data for Barbican indicates that the adults of both sexes have 

 permanent activity ranges and such shifts as they do nud^e are usually 

 to adjacent areas. There is some data from the study area in Mona 

 that contradicts this, though it is a contradiction in detail rather than 

 in substance. When I moved to Mona in mid-April, there were only 

 a few large males that were living on the larger trees, particularly 

 trees with vegetation near the base, a bed of ferns, or a bush. Only a 

 few of these males were marked — those resident in the vicinity of the 

 hibiscus hedge that were being studied in detail — but casual observa- 

 tions were made on the others. It became obvious in the period of 

 mid- to late May that there were many more adult males present and 

 that they were living on trees which had previously been unoccupied. 

 Many of them were smaller than the males which had been present in 

 mid-April. Some of these in one area were marked and their move- 

 ments watched for about two weeks (fig. 8). These data supported 

 my impressions that there w^ere a number of unestablished adult 

 males moving about in the area. The data show also that there were 

 certain males that did not change their activity ranges dvu'ing the 

 observation period. The latter males are mostly larger than the 

 former. My interpretation of the data is that the smaller males had 

 recently matured whereas the larger males were older. The older 

 males had been occupying the preferred perches and were successful 

 in keeping the smaller individuals from establishing there, forcing 

 them to spend theu' time on less favorable perches. That the young 

 males were living in subpreferable areas, coupled with the possibility 

 that they have less site attachment, accounts, I think, for their 

 movements. This is essentially the explanation offered for the 

 situation observed in Barbican. There is a striking difference, how- 

 ever, in the size of the individuals involved in the two situations. In 

 Barbican the males that made activity range shifts were mostly sub- 

 adults the size of females; in Mona they were fully adult. I think 

 there is a temporal factor herein that explains at least part of the 

 difference. The study in Barbican was terminated in March and that 

 in Mona was not started until May. I think that, if I had remained 

 in Barbican imtil May, I would have seen an increase in the number 

 of small adult males as the marked juvenile males matiu'ed and that 

 these either would have occupied the activity ranges that were not 

 occupied by adult males or woidd have wandered through the area. 

 Alternatively, had I started my study in Mona in October, I believe I 

 would then have seen a great many movements by young, subadult 

 males. 



