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Fig. 2. Leaving behavior. (A) Leaving frequency of the wild type and two
eat mutants, eat-2 and eat-5, in a population
leaving assay (eat-5 was tested on E. coli foods only).
Worms were placed near the small chunk of bacteria and allowed to enter it;
the time when the first worm entered the colony was time 0. The plot shows
mean leaving frequency between 1 and 2 h after the start. On poor quality
food, leaving is more active, and leaving behavior of eat-2 and
eat-5 is more active than that of the wild type. Values are means
± s.e.m. (N=8). *Different from the wild type on
the same bacteria (P<0.05). 
Different from
P(leaving) of the same worm strain on good food, HB101 and
Comamonas (P<0.05). All comparisons are by Student's
t-test. (B) Leaving behavior of five individual eat-2 worms
on E. coli DA837. A late-stage egg was placed near the colony. Time 0
is when the hatched larva first entered the colony. On the y-axis,
`in' is the time spent in the bacterial colony, while `out' is the time spent
outside the colony. (C) Leaving behavior of five individual wild-type worms on
Bacillus megaterium; procedure as in B. Three out of five worms at
some point, marked with arrows, left the colony and never returned. (D) Sample
leaving trajectories of an individual wild-type worm on B.
megaterium. Five typical segments of the animal's trajectory are shown
with different colors, and the direction of movement is shown with arrows.
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