. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. Figure 5. A collage of videotape frames showing the capture of a 20 nm diameter sphere by a bipinnaria (Dermasterias imbricata). Numbers (in the upper left) and arrow as in Figure 1. For scale, the arrow is 79 ^m long. The larva is shown in ventral view, moving forward toward the upper right of each panel. The sphere approached the ciliated band on the right side lateral to the larva! mouth ( s), was captured there ( s). and changed direction back toward the circumoral field ( s). The sphere was ca
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. Figure 5. A collage of videotape frames showing the capture of a 20 nm diameter sphere by a bipinnaria (Dermasterias imbricata). Numbers (in the upper left) and arrow as in Figure 1. For scale, the arrow is 79 ^m long. The larva is shown in ventral view, moving forward toward the upper right of each panel. The sphere approached the ciliated band on the right side lateral to the larva! mouth ( s), was captured there ( s). and changed direction back toward the circumoral field ( s). The sphere was captured a second time, on the preoral transverse ciliated band ( s) and then swept into the mouth ( s). artifacts. Rates of growth and development of larvae in nature are probably often limited by low phytoplankton concentrations (Paulay et al, 1985; but see Olson and Ol- son, 1989). High clearance rates are probably typical of larvae feeding on these dilute phytoplankton suspensions. Measuring ciliated band lengths Larvae were removed from the observation chamber, killed in a dilute solution of formalin in seawater, then mounted in a drop of seawater beneath a raised coverglass. Ciliated band length was estimated by summing the dis- tances between sequential landmark points on the band (such as the tips and bases of the larval arms of plutei). The planar location of each landmark was determined by digitizing a camera lucida tracing of the band for each mounted larva; the location of each landmark in the third dimension, when in focus under the microscope, was de- termined from the vertical displacement of the microscope stage (McEdward, 1985). Results Particle captures All larvae typically swam with the anterior end upper- most, from the bottom of the observation chamber, up. 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
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
