. Bulletin. Science; Natural history; Natural history. NORRISIA FEEDING ON MACROCYSTIS 71 >â o z LU O LJJ 50 â 40 â 30 â 20 â 10 â -I r 10 20 30. SHELL DIAMETER (mm) Fig. 1. Size-frequency distribution of Norrisia norrisi on Macrocystis pyrifera at study site during August 1982: Santa Catalina Island, California. Data are maximum shell diameter in mm. X = ; SD = ;N= 131. fronds per plant (SD = ; N = 15). These two values (fronds/plant) are not significantly different {P > .05, Kolmogorov-Smimov test). Plants sampled for snails were therefore assumed representative of the
. Bulletin. Science; Natural history; Natural history. NORRISIA FEEDING ON MACROCYSTIS 71 >â o z LU O LJJ 50 â 40 â 30 â 20 â 10 â -I r 10 20 30. SHELL DIAMETER (mm) Fig. 1. Size-frequency distribution of Norrisia norrisi on Macrocystis pyrifera at study site during August 1982: Santa Catalina Island, California. Data are maximum shell diameter in mm. X = ; SD = ;N= 131. fronds per plant (SD = ; N = 15). These two values (fronds/plant) are not significantly different {P > .05, Kolmogorov-Smimov test). Plants sampled for snails were therefore assumed representative of the adult kelp population. Results of the feeding experiments (Table 1) indicated a significant difference in consumption of the three tissue types (P < .05, x^-test). Sporophylls were significantly preferred over either mature laminae or apical laminae (P < .05, Duncan's multiple range test). There was no significant difference in preference between mature and apical laminae. Norrisia norrisi consumed an average of g wet weight kelp/snail/day. Table 1. Results of laboratory tissue preference and feeding rate experiments of Norrisia norrisi on Macrocystis pyrifera. Experiments consisted of 20 replicates: 14 experimental with 3 snails each and 6 controls with no snails (see text for details). Data are blotted wet weight of kelp tissues. Sporophyll tissue Mature laminae Apical laminae Total Total consumption (g) % consumption Feeding rate (g/snail/day) 53 23 24 100 Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Southern California Academy of Sciences. Los Angeles, Calif. : The Academy
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