. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. Unfamiliar Odor Familiar Odor Figure 3. Comparison of mean (±SEM) frequencies between famil- iarization groups. No differences were found in unfamiliar odor responses between familiarization groups. Differences were found in familiar odor responses. Abbreviations: Fam w/ Mytilus = Familiarized with M. edulis; Fam w/ Geukensia = Familiarized with G. demissa. Low-sensitivity scoring could not be used because it would not have been possible to determine which odor was influ- encing the behavior. Influence of experience on prey
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. Unfamiliar Odor Familiar Odor Figure 3. Comparison of mean (±SEM) frequencies between famil- iarization groups. No differences were found in unfamiliar odor responses between familiarization groups. Differences were found in familiar odor responses. Abbreviations: Fam w/ Mytilus = Familiarized with M. edulis; Fam w/ Geukensia = Familiarized with G. demissa. Low-sensitivity scoring could not be used because it would not have been possible to determine which odor was influ- encing the behavior. Influence of experience on prey selection Within 15 min of being placed in the tanks, crabs probed the calcite substrate with their dactyls, attempted to climb tank walls, or walked around. During this period, all crabs touched and moved both species of mussels. More Mytilus (45) were eaten than Geukensia (19), but about the same number of mussels of both species were rejected (Mytilus. 13; Geukensia, 14). A Wilcoxon signed ranks test determined that, overall—regardless of familiar- ization group—significantly more Mytilus were eaten than Geukensia (P ) (Ta- ble I). Figure 4 compares the species of prey eaten and rejected by crabs in the two familiarization groups. Crabs familiar with Geukensia cumulatively ate 21 Mytilus and 5 Geuken- sia, and rejected 11 Mytilus and 11 Geukensia. Crabs fa- miliar with Mytilus ate 24 Mytilus and 14 Geukensia. and rejected 2 Mytilus and 3 Geukensia. In all cases, Mytilus was handled first and eaten first. Both groups of crabs handled about the same number of mussels (43 for Mytilus- familiarized crabs and 48 for Geukensia-famiYiarized crabs). A Mann-Whitney test with tied ranks determined that there was no significant difference in total mussels, regard- less of species, eaten (P > ) or rejected (P > ), between crabs familiarized with Mytilus and crabs familiar- ized with Geukensia (Table I). 30 i 25 20- 15 10 • • 5 • • QFam w/ Mytilus HFamw/ Ge
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
