Cameron, R. Andrew and Tosteson, Thomas R. and Hensley, Valentine (1989) The Control of Sea Urchin Metamorphosis: Ionic Effects. Development, Growth & Differentiation, 31 (6). pp. 589-594. ISSN 0012-1592 http://resolver.caltech.edu/CaltechAUTHORS:20121025-101806899
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Because the cascade of events which comprise sea urchin metamorphosis occur rapidly, regulatory mechanisms able to respond in minutes must function. Employing sea water solutions of altered ionic composition in the presence or absence of metamorphically active microbial films, we tested the ability of particular ions to inhibit or enhance metamorphosis in competent larvae of the sea urchin, Lytechinus variegatus. At 40 mM excess potassium maximally induces normal metamorphosis in the absence of a microbial film. In the presence of metamorphically active microbial films, 40 mM excess magnesium inhibits the process. Increasing concentrations of calcium up to an excess of 40 mM stimulates larvae to undergo metamorphosis but in smaller proportions than similar concentrations of potassium. Divalent cation-free sea water solutions are toxic to larvae. These studies support the hypothesis that ion fluxes are involved in the regulation of metamorphosis and reveal a complexity of response that parallels the histological complexity of competent echinoid larvae.
|Additional Information:||© 1989 John Wiley & Sons, Inc. Issue published online: 7 Jul 2008; Article first published online: 7 Jul 2008; Received March 27, 1989; accepted June 26, 1989. The technical assistance of I. Metairon-Boidron is gratefully acknowledged. The manuscript was greatly improved through suggestions by Dr. B. Hough-Evans and D. Nishioka. This work was supported by NSF grant DCB 8544707. Potassium/calcium/magnesium/microbial films.|
|Official Citation:||Cameron, R. A., Tosteson, T. R. and Hensley, V. (1989), The Control of Sea Urchin Metamorphosis: Ionic Effects. Development, Growth & Differentiation, 31: 589–594. doi: 10.1111/j.1440-169X.1989.00589.x|
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|Deposited By:||Aucoeur Ngo|
|Deposited On:||25 Oct 2012 18:10|
|Last Modified:||25 Oct 2012 18:10|
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