. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. EFFECT OF ZOOID SPACING ON FEEDING 21 random effect of the A:"1 particle of the /'h colony in the /"' spacing treatment, and el|km == the unexplained random error. If the slopes had not been found to be significantly different ( if P > ). then the slopes among spac- ing treatments would have been set as equal to each other, and the intercepts would have been compared using the following: (Equation 2) where j8 is the common slope for all levels of the spacing factor. However, since the slopes differed, t
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. EFFECT OF ZOOID SPACING ON FEEDING 21 random effect of the A:"1 particle of the /'h colony in the /"' spacing treatment, and el|km == the unexplained random error. If the slopes had not been found to be significantly different ( if P > ). then the slopes among spac- ing treatments would have been set as equal to each other, and the intercepts would have been compared using the following: (Equation 2) where j8 is the common slope for all levels of the spacing factor. However, since the slopes differed, the data were split into three subset ranges of the covariate: ( 1 ) 0 < D < (2) < D < and (3) < D < where D is the distance (in cm) from the lophophore. ANCOVA tests using Equation 2 were done separately on each of the three subset ranges, and the Tukey-Kramer adjustment was used for a posteriori pairwise contrasts. Incurrent velocities were log-transformed in all analyses. Results Feeding experiments Feeding rate with two spacing treatments and clone as a random factor. The zooids in the close treatment had significantly higher mean zooid ingestion rates than the zooids in the spaced treatment, but velocity and the interaction between velocity and zooid spacing did not have a significant effect on ingestion rate (Fig. 4). A significant amount of variation in zooid ingestion rate was contributed by the colony and clone random factors (P < ). Feeding rate with all three spacing treatments. Spacing and velocity had significant effects on zooid ingestion rate, but (56) 'JZ "O S '= c -o N £. Velocity (cm s' ) Figure 4. Zooid ingestion rate in two free-stream velocities for two zooid spacing treatments. Spaced zooids: gray bars; close zooids: black bars. Ingestion rate was greatest for closely spaced zooids (P = Velocity (P = ) and the interaction between velocity and spacing (P = ) did not significantly
Size: 2213px × 1129px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
