NO. 3595 ANOLIS LINEATOPUS — RAND 33 



two months under observation showed no sign of attempting to return 

 home. 



Spatial relationships between activity ranges. — The size, 

 shape, and location of an A. lineatopus activity range is influenced not 

 only by the distribution of the habitat requirements but also by 

 the distribution of other A. lineatopus. 



Even casual observations show thatx4. lineatopus are not distributed 

 randomly with respect to one another. This is particularly obvious 

 along fence rows, where, on almost every fence post, there is one large 

 male but very rarely two. A similar though less conspicuous relation- 

 ship occurs in the distribution of the adidt females. 



The simplest situation of this sort that I studied was observed in a 

 series of poui trees planted along a road through the faculty housing 

 of the University of the West Indies at Mona. 



The trees had been planted in a strip of grass at about 12 yard 

 intervals, about 4 yards from a hibiscus hedge on one side and about 

 2 yards from the paved road on the other. They ranged in size from 

 4 to 12 inches (most of them 8 or 9 inches) in diameter and about 

 20 to 30 feet high. The spacing of the trees was such that no lizard 

 included two in his activity range. All of the females and most of 

 the males probably had no other principal perches than the trees 

 and the vegetation at their base. 



Dm-ing one afternoon (May 20), I examined the trees along both 

 sides of a kilometer of this road, looking carefully at each tree and 

 examining the vegetation growing at the base. I caught every A. 

 lineatopus that I could and sexed, measured, and then released it. 

 A total of 55 trees were examined and 72 A. lineatopus seen. Sixty- 

 one were caught, sexed, and measured, plus five more I was able to 

 sex confidently and estimate the size sufficiently to use the data. 



The four A. lineatopus that I could not size or sex accurately have 

 been omitted from the following discussion as have the other A. 

 lineatopus on the same trees with them. This reduced the data 

 analyzed to 51 trees with 62 A. lineatopus. 



Of males, 32 were sexually mature (i.e. greater than 50 mm snout- 

 vent length), 7 were probably not sexually mature (i.e., less than 50 

 mm snout- vent length). Twenty-two of the 23 females were probably 

 sexually mature (i.e., greater than 36 mm snout- vent length). 



Of the 51 trees, 18 had no adult A. lineatopus on them at all, 13 

 had one, 19 had two, and 1 had three. 



The observed distribution departs from random distribution in 

 two ways: there are fewer trees with two adults of the same sex 

 and more with two adults of opposite sex. 



Using binomial distribution, the expected number of trees with 

 0, 1, and 2 lizards were calculated independently for each sex on the 



240-241—67 3 



