. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. IONIC CONTROL OF METAMORPHOSIS 21 Nalural SW Natural SW. 10 mM Co2* Artifical SW Artificial SW + 2 25 mM Ca2* Artificial SW. IBmMCa 'WZfZM: . ...' ' 1 1 69 |w <%%%%%%& '%%%%%%%, |S9 79 ;•...•;_:•/:_ '•MfM77 -I • 1 • 1 1 1 • 1 0 20 40 60 8 Percent Metamorphosed Figure 4. Histograms showing with lower than normal or higher or the calcium channel blocker Co2+ The hatched segment of each bar underwent normal metamorphosis the top of the bar. Experiments A separate females. the effect of treatment with seawater than normal
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. IONIC CONTROL OF METAMORPHOSIS 21 Nalural SW Natural SW. 10 mM Co2* Artifical SW Artificial SW + 2 25 mM Ca2* Artificial SW. IBmMCa 'WZfZM: . ...' ' 1 1 69 |w <%%%%%%& '%%%%%%%, |S9 79 ;•...•;_:•/:_ '•MfM77 -I • 1 • 1 1 1 • 1 0 20 40 60 8 Percent Metamorphosed Figure 4. Histograms showing with lower than normal or higher or the calcium channel blocker Co2+ The hatched segment of each bar underwent normal metamorphosis the top of the bar. Experiments A separate females. the effect of treatment with seawater than normal concentrations of Ca2* on substrate induced metamorphosis, ndicates the proportion of cases that The number of cases is indicated at and B were done with larvae from K+ seawater for 30 min, over half of these larvae under- went metamorphosis. The Co2+ and low Ca2+ seawater treatments did not alter the ability of the substrate in the Linbro dishes to induce metamorphosis. When the sea- water with the Co2+ and the low Ca2+ seawater was re- moved from the wells and replaced by natural seawater and a batch of four-day larvae were added to the dish, metamorphosis was induced in more than 50% of the cases at 24 h. When larvae were placed in dishes with a substrate that would induce metamorphosis under con- ditions where the Ca2+ was higher than normal (18 mA/), a higher proportion of larvae underwent metamorphosis than in dishes of seawater with the normal amount of Ca2+ (9 mA/) (Fig. 4B). These experiments suggest that calcium channel function may also play a role in substrate induced metamorphosis. The role oj the pedicle lobe in metamorphosis Prior to substrate induced metamorphosis the larva ap- proaches the site where it will settle with its pedicle lobe, makes contact and adheres to the substrate with the distal end of its pedicle lobe. The possibility exists that there are substrate receptor cells in the pedicle that have to be activated to initiate metamorphosi
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
