. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 22 M. W. HART. Figure 10. A cartoon of the particle capture sequence shown in Figure 9. The positions of the sphere in each panel of Figure 9 are indicated by the dots, and the particle path between these panels is interpolated by the solid line. The ciliated band of the larva is shown by the heavy lines; the mouth and stomach are shown in outline. Most spheres caught by echinoplutei were captured just once on the ciliated band, but the incidence of multiple captures of spheres increased for Strongylocentrotus droe- bachiens
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 22 M. W. HART. Figure 10. A cartoon of the particle capture sequence shown in Figure 9. The positions of the sphere in each panel of Figure 9 are indicated by the dots, and the particle path between these panels is interpolated by the solid line. The ciliated band of the larva is shown by the heavy lines; the mouth and stomach are shown in outline. Most spheres caught by echinoplutei were captured just once on the ciliated band, but the incidence of multiple captures of spheres increased for Strongylocentrotus droe- bachiensis as these larvae developed more arms: for four- armed larvae (n = 9), ± (mean ± ) of spheres captured were retained at more than one location on the ciliated band before entering the mouth; for six-armed larvae (n = 18), ± ; for eight-armed larvae (n = 17). ± Analysis of variance ofarcsine-trans- formed proportions suggests that this is a significant in- crease in the incidence of multiple captures of spheres (F = , P = ). Thus the complexity of particle paths to the mouth increases as plutei increase in size and change shape. Retention of captured particles Larvae of all species rarely failed to move to the mouth particles that had been removed from suspension at the ciliated band. For example, of 443 spheres captured by Parastichopus larvae at the ciliated band (where the site and number of captures for each sphere could be deter- mined), only 29 () were lost before reaching the mouth (Table I); Dermasterias larvae lost only 11 of 491 such spheres (). The frequency of loss did not vary significantly among segments of the band (anterior, lateral, and posterior to the mouth) for Dermasterias larvae (compared by contingency table analysis, \2 = , P > ). The same proportions varied significantly for Parastichopus (X2 = , P < ), mainly because I observed no spheres lost from the lateral portions of th
Size: 1762px × 1418px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
