Comparisons of preferred position in the tank.

The random chance of using a location was considered as the percentage of the total involved area (therefore, tiles represents 19.9% of the total tank area, and the large tile represents 79.7% of the “under tile” area in a tank). Binomial tests considering both methods of determining “random” placement were run. All p-values are two-tailed.
a) Males were more likely than expected by chance (based on the area of the tank covered by tiles) to spend a majority of checks under the tiles rather than out.
b) While the largest and smallest males used the large and small tiles as expected based on random usage (determined by the area covered by each tile), males of size rank 2 and 3 used the large tile less than would be expected by chance.
Note: the numbers between comparisons vary, since males could only be included in these analyses if a preference could be established based on their being in a particular location for the majority of either all checks (a) or those checks for which they were under any tile (b).