. The Biological bulletin. Biology; Zoology; Marine biology. CILIARY FEEDING OF VELIGERS C gigas 531. 50 urn Figure 4. Optical section across the velar edge diagrammed for three species to same scale. Preoral and postoral cilia indicated but food groove cilia omitted. Preoral cilium shown in several positions. Dashed lines mark two particle paths (see text). sion. The clearance rate is estimated by multiplying the volume passing the cilia by the fraction of particles cleared. Though longer cilia are less efficient, there is a definite gain in rate of clearance per unit length of cil
. The Biological bulletin. Biology; Zoology; Marine biology. CILIARY FEEDING OF VELIGERS C gigas 531. 50 urn Figure 4. Optical section across the velar edge diagrammed for three species to same scale. Preoral and postoral cilia indicated but food groove cilia omitted. Preoral cilium shown in several positions. Dashed lines mark two particle paths (see text). sion. The clearance rate is estimated by multiplying the volume passing the cilia by the fraction of particles cleared. Though longer cilia are less efficient, there is a definite gain in rate of clearance per unit length of ciliated band with longer preoral cilia. Mechanisms of concentrating particles If particles are to be concentrated, they must be moved relative to the water. We have no means of observing water movement in this study, but the observed motion of cilia and particle gives some information on the mechanism by which particles are concentrated. Several combinations of events could occur during concentration: the particles could move faster or slower than the water by either adhering to the cilia or being sieved by two adjacent cilia in their effective strokes. Our observations indicate that more than one mechanism of concentration could be operating. The simplest hypothesis for concentration is that preoral cilia push adhering particles faster than the water during the effective stroke. In many captures, a preoral cilium overtakes a particle and then moves along next to it. This motion is consistent with the hypothesis that the cilium is pushing an adhering particle faster than the water. Captures occur in which no cilia are observed to touch the particles, but a capturing cilium may have been out of 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 Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-;
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectb, booksubjectzoology
