. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 0 2 4 6 8 10 Days after initial injection •a— LiCI + beef ••— NaCI + beef -•— Puncture + beef a— Shell off + beef o> a. 12 Days after initial injection Figure 1. Number ofindividual hermit crabs (Pagurus granosima- nus) that rejected daily feedings of (A) beef and (B) fish. The legend applies to both graphs. Four groups of 15 animals each were treated on day zero, one hour after eating a novel food (beef); those that accepted beef the next day received a second treatment. One treatment group was only removed from the shel
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 0 2 4 6 8 10 Days after initial injection •a— LiCI + beef ••— NaCI + beef -•— Puncture + beef a— Shell off + beef o> a. 12 Days after initial injection Figure 1. Number ofindividual hermit crabs (Pagurus granosima- nus) that rejected daily feedings of (A) beef and (B) fish. The legend applies to both graphs. Four groups of 15 animals each were treated on day zero, one hour after eating a novel food (beef); those that accepted beef the next day received a second treatment. One treatment group was only removed from the shell; a second was also punctured with a hypodermic needle. Two other groups received injections, one with lithium chloride, and the other with sodium chloride. ond treatment, neither group developed an aversion to beef (Fig. 1A). Significantly more of the animals in the fish-Nad treatment group rejected beef on first encoun- tering this new food, 12 h after their treatments on day 0 and day 1 (comparison with the beef-shell removal con- trol group; G-test, P < .01 and P < .025 for day 0 and day 1, respectively; Fig. 2B); however, none of these animals showed a long-term aversion to beef (Fig. 3C). Consistent acceptance of a familiar food All of the groups continued to accept fish throughout the test period (Fig. 1 B). Of the two groups that were in- jected after eating this familiar food, neither learned to reject fish (Fig. 2A). Mortality Six animals died during the experiment: one from the beef-LiCl group on day 4; three from the fish-NaCl group on days 2, 9, and 10; one on day 11 from the group that was simply removed from the shell; and one from the fish-LiCl group on day 10. Discussion When injected with LiCI one hour after their first beef meals, hermit crabs (Pagurus granosimanus) learned in one or two trials to avoid this novel food while continu- ing to eat a familiar food (fish). This aversion to beef commonly lasted for more than a week under labo
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
