Responses of cirripede larvae to light. I. Experiments with white light |
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Authors: | D J Crisp D A Ritz |
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Institution: | (1) Present address: NERC Unit of Marine Invertebrate Biology, Marine Science Laboratories, University College of North Wales, Menai Bridge, Anglesey, N. Wales, (UK);(2) Department of Marine Biology, Marine Science Laboratories, University College of North Wales, Menai Bridge, Anglesey, N. Wales, (UK);(3) Present address: Department of Biology, Royal University of Malta, Msida, Malta |
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Abstract: | The phototactic response of the nauplius larva of Balanus balanoides, B. crenatus and Elminius modestus shows darkadaptation; the response of the cyprid of B. balanoides shows both phototaxis and low photokinesis. The phototactic responses and the orientation of the cyprid to white light at settlement require an intensity of illumination slightly above 10-5 lux. The ability to select a shaded position by cyprids of R. balanoides requires a higher intensity of 10-2 to 10-4 lux; hence a different mechanism may be involved. Barnacle larvae are sufficiently sensitive to be able to respond to light beneath the sea surface, even on cloudy, moonless nights. |
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