. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. Figure 3. Cyphoma gibboswn host preferences at Korbiski. See Fig- ure 2 for explanation. The average stay per visit during 1984 was d ( = ) and was d ( = ) in 1985. There were no significant differences among species in the number of days a snail remained on a colony (Table III; 1984—F = , df= 5,48, P> ; 1985—F= , df= 5,142, P>). Grazing The feeding rates measured at the three sites during 1985 were extremely variable (Table IV). Feeding rates on some gorgonian species were an order
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. Figure 3. Cyphoma gibboswn host preferences at Korbiski. See Fig- ure 2 for explanation. The average stay per visit during 1984 was d ( = ) and was d ( = ) in 1985. There were no significant differences among species in the number of days a snail remained on a colony (Table III; 1984—F = , df= 5,48, P> ; 1985—F= , df= 5,142, P>). Grazing The feeding rates measured at the three sites during 1985 were extremely variable (Table IV). Feeding rates on some gorgonian species were an order of magnitude greater at Macaroon than at the other sites. Feeding rates between sites and years differed in the relative ranking of the species as well as in the absolute magnitude of the feeding rate. Feeding rates were greatest on Pseudoplex- aura spp. at Macaroon, Plexaura A at Korbiski, and P. llexuosa at Pinnacles. The differences in feeding rates were only significant at Pinnacles (F = , df = 5,218, P = .002), and at that site much of the significant result can be attributed to the absence of measurable feeding on B. asbestinum colonies. Aside from the comparisons involving B asbestinum SNK tests indicate that snails at Pinnacles fed at greater rates on Pseudoplexaura spp. and on P. flexuosa than on "other" species, primarily Pseudopterogorgia spp. There were no significant differ- ences between species in feeding rates at Macaroon (F = , df = 5,265, P = ). However, even after transformation feeding rates at Macaroon exhibited sig- nificant heteroscedasticity between species (Bartlett-Box F = , P< ). The most accurate measurements of damage were made in the single day observations of single snails. Four species were compared in those tests, Pseudoplexaura spp. (predominantly P. porosa), Plexaura homomalla, P. flexuosa, and Pseudopterogorgia americana. Feeding on the different species differed significantly (F = , df = 3,115, P
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
