Field experiments with hatchling green sea turtles (Chelonia mydas) show that a positive phototropotaxis will account for many aspects of their ability to find the sea after emerging from the nest. The tropotactic reaction is discussed with respect to retino-tectal projections in reptiles and it is suggested that visual stimulation of one eye may initiate both ipsilateral and contralateral turning tendencies, depending on which part of the retina is stimulated. The influence of the sun''s position and the effects of varying the spectral composition of light stimuli are outlined. Some complexities in experiments on the responses to light of frogs (Rana temporaria) and freshwater turtles (Pseudemys scripta elegans) are reported, and it is concluded that for correlating behaviour with physiological mechanisms a more dependable behaviour such as sea-finding in marine turtles offers some advantages.

This content is only available via PDF.
Copyright / Drug Dosage / Disclaimer
Copyright: All rights reserved. No part of this publication may be translated into other languages, reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying, recording, microcopying, or by any information storage and retrieval system, without permission in writing from the publisher.
Drug Dosage: The authors and the publisher have exerted every effort to ensure that drug selection and dosage set forth in this text are in accord with current recommendations and practice at the time of publication. However, in view of ongoing research, changes in government regulations, and the constant flow of information relating to drug therapy and drug reactions, the reader is urged to check the package insert for each drug for any changes in indications and dosage and for added warnings and precautions. This is particularly important when the recommended agent is a new and/or infrequently employed drug.
Disclaimer: The statements, opinions and data contained in this publication are solely those of the individual authors and contributors and not of the publishers and the editor(s). The appearance of advertisements or/and product references in the publication is not a warranty, endorsement, or approval of the products or services advertised or of their effectiveness, quality or safety. The publisher and the editor(s) disclaim responsibility for any injury to persons or property resulting from any ideas, methods, instructions or products referred to in the content or advertisements.
You do not currently have access to this content.