. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. FEEDING BY ECHINODERM LARVAE 19 Figure 7. A collage of videotape frames showing the capture of a 20 ^m diameter sphere by an auricularia (Parastichopus californicus). Numbers and arrow as in Figure I. For scale, the arrow is 128 ^m long. The larva is shown in ventral view, moving forward toward the upper left ot each panel. The sphere approached the dorsal ciliated band on the right side anterior to the larval mouth ( s), was captured there ( s). and changed direction posteriorly along the
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. FEEDING BY ECHINODERM LARVAE 19 Figure 7. A collage of videotape frames showing the capture of a 20 ^m diameter sphere by an auricularia (Parastichopus californicus). Numbers and arrow as in Figure I. For scale, the arrow is 128 ^m long. The larva is shown in ventral view, moving forward toward the upper left ot each panel. The sphere approached the dorsal ciliated band on the right side anterior to the larval mouth ( s), was captured there ( s). and changed direction posteriorly along the circumoral field toward the right lateral portion of the band ( s). The sphere was captured a second time, lateral to the mouth ( s), and then moved toward the larval midline and into the mouth ( s). to the mouth, then was recaptured on the lateral ciliated band before entering the suboral pocket and mouth. Larvae of all species occasionally captured spheres without close approach of the sphere to the ciliated band, and without abrupt change in the direction of movement of the sphere at the band. Such a particle capture (by the same Dennasterias larva illustrated in Figs. 5 and 6) is shown in Figures 9 and 10. These few spheres followed broad, curving paths into the suboral pocket of the larva, where they were swept into the larval mouth (probably by the current generated by the cir- cumoral cilia). These particle paths resembled those described by GUmour (1985, 1986, 1988b). Strathmann (1971) also depicted such particle captures, but did not emphasize their frequency or importance. I observed 44 individuals of Strongylocentrotus droebachiensis capture 1594 spheres; of these, only 80 () were caught without an approach and a change of direction at the ciliated band. Similar proportions obtained for 13 Parastichopus (23 of 438 captures without ciliary reversals, () and 17 Dennasterias (24 of 504 cap- tures, ). These proportions do not vary signif
Size: 1770px × 1412px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
