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Fig. 4. Starvation and sustained exposure to new temperatures have separate
long-term effects on thermotactic behavior. (A) When wild-type (WT) worms that
were grown overnight at 15°C and then starved for 4 h at 25°C are
placed near the middle of the linear thermal gradient, they exhibit random
dispersal. The movements of (B) wild-type worms and (C) ttx-3(ks5)
mutant worms up or down spatial thermal gradients spanning 18–22°C
were quantified after they had been grown at 15°C (left-hand panels) or
grown at 25°C (right-hand panels). Line colors indicate the temperature of
the worms during the 4 h preceding each experiment; blue represents 15°C
and red represents 25°C. Solid lines indicate experiments using unstarved
worms. Dotted lines indicate experiments in which worms were starved at
15°C or 25°C before each experiment. In each data trace, error bars
(±1 s.e.m.) are shown at 10 min intervals. The speed of instantaneous
forward-crawling movements exhibited by individual worms in each experiment is
indicated in italics, showing that atactic behavior cannot simply be
attributed to lack of mobility (mean ± s.d.).
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