. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. B. en O O E 15 3 4 5 7 24 BIO ASW Treatment (hrs exposure lo 10 niM Cs*). Treatment (mMCs) Figure 4. Dose-response relationship for cesium applied as a pulse. Metamorphosis of Hydroides ekf> after exposure to (A) 10 mM CsCl for to 24 h; (B) 10 or 30 mW CsCl for 3 h. Concentrations higher than 30 niM were toxic. Bars indicate mean percentages of larvae that metamorphosed ± 1 SE (h = 4 replicates/treatment), evaluated 24 or 48 h after the beginning of the pulse. BIO = substratum coated with a marine biofilm; FSW =
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. B. en O O E 15 3 4 5 7 24 BIO ASW Treatment (hrs exposure lo 10 niM Cs*). Treatment (mMCs) Figure 4. Dose-response relationship for cesium applied as a pulse. Metamorphosis of Hydroides ekf> after exposure to (A) 10 mM CsCl for to 24 h; (B) 10 or 30 mW CsCl for 3 h. Concentrations higher than 30 niM were toxic. Bars indicate mean percentages of larvae that metamorphosed ± 1 SE (h = 4 replicates/treatment), evaluated 24 or 48 h after the beginning of the pulse. BIO = substratum coated with a marine biofilm; FSW = seawater filtered through ^m filter; ASW = artificial seawater. K* alone (66%) (Fig. 5A). When larvae of H. elegans were exposed to a biofilm in the presence of Cs*. metamorphosis was higher than with biotiim or Cs* tested separately (Fig. 5B). These values were significantly different at 24 and 48 h of inifial exposure to the inducers {P < ). When larvae were induced to metamorphose by a biofilm that had been pre-soaked in seawater containing CsCl, percentages of metamoiphosis were similar to those obsei-ved with biofilm not exposed to Cs*, demonstrating that cesium ion has no direct effect on the biofilm. Effects of telraethylcimmoniiini chloride (TEA) TEA inhibited metamorphosis in a concentration-de- pendent manner when larvae were induced with excess K"" or Cs"^. Significant inhibition of metamorphosis (P < ) was found when 10 mM TEA was tested in the presence of excess K"^ for 24 h (Fig. 6A), and when Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clare
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