. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. y= + r = i I i i i i 0 4 8 12 16 20 24 28 , - > K - y = Ix + |- = i i r i i i i 0 4 S 12 16 20 24 28 Larval Swimming Duration (h) Figure 5. Bugula neritina. Height (A), surface area (B), and volume (C) of lophophore as a function of larval swimming duration in Bugit/ci neritina. Samples of larvae were taken every 4 h, at which time they were induced to metamorphose by exposure to 10 mM excess KC1 in seawater. Each datum is the mean of 8-32 individuals poole
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. y= + r = i I i i i i 0 4 8 12 16 20 24 28 , - > K - y = Ix + |- = i i r i i i i 0 4 S 12 16 20 24 28 Larval Swimming Duration (h) Figure 5. Bugula neritina. Height (A), surface area (B), and volume (C) of lophophore as a function of larval swimming duration in Bugit/ci neritina. Samples of larvae were taken every 4 h, at which time they were induced to metamorphose by exposure to 10 mM excess KC1 in seawater. Each datum is the mean of 8-32 individuals pooled from 5 replicates (bars = 1 standard error). ming, the mean height, surface area, and volume de- creased by ca. 30%, 50%, and 62%, respectively, when compared to those of individuals that developed from larvae induced to metamorphose shortly after the onset of larval swimming (ANOVA; F -• > , P = < for each parameter; n = 3; a total of 107, 143, and 20 individuals were measured for 0. 30, and 40 h, respectively). Discussion Duration of metamorphosis Duration of metamorphosis on average increased as a function of larval swimming period (Figs. 2 and 3). After 30 h of larval swimming, individuals were taking almost 10 h longer to complete metamorphosis than those in- duced shortly after the onset of larval swimming. The observed increase in duration of metamorphosis is prob- ably due to the utilization of less labile energy sources to complete metamorphosis. In Bugula spp. certain larval tissues (, the corona, ciliated epithelia, and vesicular collarettes) are transitory. At the onset of metamorphosis these tissues are internalized and ultimately undergo his- tolysis (Woollacott and Zimmer, 1978). Individuals that swim longer before initiating metamorphosis deplete la- bile energy stores to a greater degree and, therefore, they must rely more heavily on these transitory tissues for the energy necessary to complete metamorphosis. It is likely that the bioc
Size: 1926px × 1298px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
