. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ATTACHMENT OF CYANEA PLANULAE 15 Aboral contact normal to a substrate is not the sole stimulus leading to attachment. Planulae gliding along a container bottom, or swimming horizontally, collide with the surface of vertically oriented plastic coverslips with their aboral end, but few (348) attach there relative to horizontally held coverslips (5551) (F,il2 = ; P ), and for horizontal coverslips (Fj ,2 = ; < P < ). Planulae attach to a suitable substrate more frequently if that surface is properly
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ATTACHMENT OF CYANEA PLANULAE 15 Aboral contact normal to a substrate is not the sole stimulus leading to attachment. Planulae gliding along a container bottom, or swimming horizontally, collide with the surface of vertically oriented plastic coverslips with their aboral end, but few (348) attach there relative to horizontally held coverslips (5551) (F,il2 = ; P ), and for horizontal coverslips (Fj ,2 = ; < P < ). Planulae attach to a suitable substrate more frequently if that surface is properly oriented, regardless of its texture (see Discussion). The temporal sequence of planular attachment to coverslips of plastic or glass is shown in Figure 2. Planulae attach to plastic (at hours) hours sooner than they attach to glass (at hours). Attachment to glass is more variable than that for plastic ( = and , respectively) and is not normally distributed; the solid curve for attachment to glass (fit by eye) is made parallel to the curve for attachment to plastic. However, even without statistical comparison the difference between attachment to glass and to plastic is clearcut. The actual exponential curve for attachment to glass coverslips (dashed curve, Fig. 2) occurs during the attachment of planulae to the hyponeuston beginning at seventeen hours, to the dish bottom at nineteen hours, and to the upper surface of coverslips at twenty-one hours. Planulae attach to plastic surfaces before they do to those of glass, but during their settlement on glass coverslips, they attach to other surfaces in their experimental container. Three other comparisons between planular response to plastic and to glass can be made from this experiment of twenty-four hours duration. First, as above, the 99 98 ;95 190 i o s50 Q. UJ _ I '0 o o INDIVIDUAL COVERSLIP • AVERAGE r,/ PLASTIC. GLASS. Please note that these images are extracted from scanned page images that may
Size: 1427px × 1750px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
