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Electrical Activity at Metamorphosis in Larvae of the Sea Urchin Lytechinus pictus (Echinoidea: Echinodermata)

Satterlie, Richard A. and Cameron, R. Andrew (1985) Electrical Activity at Metamorphosis in Larvae of the Sea Urchin Lytechinus pictus (Echinoidea: Echinodermata). Journal of Experimental Zoology, 235 (2). pp. 197-204. ISSN 0022-104X. doi:10.1002/jez.1402350206.

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Two types of electrical potentials were recorded from competent echinopluteus larvae of Lytechinus pictus. The first was associated with reversal of cilia that line the ridges of larval epaulettes. Ciliary reversal potentials were recorded from all parts of the larvae and from isolated body parts. Estimated conduction velocity of ciliary reversal potentials was 10–20 cm/s. The second type of potential was largest when the electrode was placed over the urchin rudiment. Rudiment potentials could not be recorded from isolated epaulettes and could not be correlated with any obvious behavior of the larva. Both potentials increased in frequency when a larva was brought in contact with a “conditioned” substrate. Ciliary reversal potential frequency increased six- to seven fold within a minute or two of contact and remained elevated until the point of partial tissue collapse during metamorphosis. Rudiment potential frequency also increased, but only three- to five fold and with a longer latency (3–6 min to peak frequency). Rudiment potentials maintained an elevated level of firing through total tissue collapse, at which time the larvae were electrically silent. Attempts to record from juvenile urchins, to determine the fate of the rudiment potential system in the final stage of metamorphosis, were unsuccessful.

Item Type:Article
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Cameron, R. Andrew0000-0003-3947-6041
Additional Information:© 1985 Alan R. Liss, Inc.
Issue or Number:2
Record Number:CaltechAUTHORS:20121025-165659591
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Official Citation:Satterlie, R. A. and Andrew Cameron, R. (1985), Electrical activity at metamorphosis in larvae of the sea urchin Lytechinus pictus (Echinoidea: Echinodermata). J. Exp. Zool., 235: 197–204. doi: 10.1002/jez.1402350206
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:35109
Deposited By: Aucoeur Ngo
Deposited On:30 Oct 2012 22:12
Last Modified:09 Nov 2021 23:12

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