. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 51. Figure 3. Capture of a polystyrene sphere by an 8-day-old Dcihlnnlci c\i\' larva fed 250 cells ml ' Rhodomonas sp. The larva is shown in anterior ventral view (swimming up toward the video camera). Video frame number (30 frames s ') is shown in the upper nght of each panel. Each video frame was edited to enhance contrast and reduce background pixel values to near zero. An unintended result of this editing is an increase in the apparent size of the polystyrene sphere (by about 2 • I. The sphere (arrow) came into f
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 51. Figure 3. Capture of a polystyrene sphere by an 8-day-old Dcihlnnlci c\i\' larva fed 250 cells ml ' Rhodomonas sp. The larva is shown in anterior ventral view (swimming up toward the video camera). Video frame number (30 frames s ') is shown in the upper nght of each panel. Each video frame was edited to enhance contrast and reduce background pixel values to near zero. An unintended result of this editing is an increase in the apparent size of the polystyrene sphere (by about 2 • I. The sphere (arrow) came into focus at frame 26, was captured with a localized change in direction of the ciliary current at the tip of the nght postoral arm (30-35), moved toward the larval midline (39), was captured again midway along the length of the arm (41 -47). and was ingested (51). Inset (lower right): interpolated path of the captured sphere begins at the arrow; dots show the location of the sphere in frames 26-47. For scale, the right postoral arm is about 700-fim long (actual scale is not known). Abbreviations: al. anterolateral arm: pd. posterodorsal arm; po, postoral arm. Clearance rates Maximum clearance rates of echinoderm larvae are highly correlated with ciliated hand lengths (Strathmann. 1971; Hart, 1991). Developmental changes in feeding rates of Dendraster larvae were associated with changes in band length (Fig. 4A). For larvae >7 days old, there was a sig- nificant interaction between the effects of food ration and larval age on maximum clearance rate ( F,A2 = , P = ). Clearance rates increased more rapidly with age for larvae fed the ;uc; ration, because these larvae rapidly grew ciliated bands at an early age. However, larvae fed the smaller ration eventually grew longer bands, and their clearance rates surpassed those of the largest larvae fed the larger ration. Mean maximum clearance rates of 23- day-old larvae ( ± ,ul min ', n = 10) fed the smaller rati
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
