Descriptive statistics for each colony.

<p>Fat content is as a proportion of total dry body mass. Fat content and head width are reported as means +/- standard error with sample size in parentheses. Brood was present but not counted for colony 5. Colony 5 was collected in 2004 while the remainder in 2009.</p

The relationship between individual fat content (as a proportion of total dry body mass) and the relative depth at which the individual was collected (1 being deepest and 0 being the surface) for five colonies of <i>Dinoponera australis</i> (each colony is coded by a different color).

<p>Colonies differed in the slope of the relationship between fat content and relative depth (F_4,267 = 3.41, P = 0.01), but the relationship is highly significant (F_1,267 = 137.93, P<0.0001) and colonies did not differ in average individual fat content (F_4,267 = 1.27, P = 0.28). The inset shows brood (larvae and pupae) as a function of depth; only the deepest chambers contained brood.</p