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Article: Cytological basis of photoresponsive behavior in a sponge larva.(Statistical Data Included)
- Article from:
- The Biological Bulletin
- Article date:
- December 1, 2001
- Author:
CopyrightCOPYRIGHT 2001 Marine Biological Laboratory. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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Sally P. Leys (1)(*)
Bernard M. Degnan (2)
Abstract. Ontogenetic changes in the photoresponse of larvae from the demosponge Reneira sp. were studied by analyzing the swimming paths of individual larvae exposed to diffuse white light. Larvae swam upward upon release from the adult, but were negatively phototactic until at least 12 hours after release. The larval photoreceptors are presumed to be a posterior ring of columnar monociliated epithelial cells that possess 120-[micro]m-long cilia and pigment-filled protrusions. A sudden increase in light intensity caused these cilia to become rigidly straight. If the light intensity remained high, the cilia ...
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