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Table of Contents
Vol. 47, No. 4, 1986
Issue release date: 1986
Section title: Paper
Folia Primatol 1986;47:171–188
(DOI:10.1159/000156276)

Direct Modulation of Activity and Body Temperature of Owl Monkeys (Aotus lemurinus griseimembra) by Low Light Intensities

Erkert H.G. · Gröber J.
Institute of Biology III, University of Tübingen, FRG

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Article / Publication Details

First-Page Preview
Abstract of Paper

Published online: September 11, 2008
Issue release date: 1986

Number of Print Pages: 18
Number of Figures: 0
Number of Tables: 0

ISSN: 0015-5713 (Print)
eISSN: 1421-9980 (Online)

For additional information: http://www.karger.com/FPR

Abstract

The activity pattern of Aotus lemurinus griseimembra can be predictably altered by varying the illuminance during the dark phase of a 12:12-hour light:dark rhythm. Intensities well below full-moon brightness (0.1–0.5 1x) severely inhibit activity. This modulation is not the result of a light-induced phase shift of the circadian rhythm, but it is primarily caused by masking due to direct effects of light on the motor system. Both proportional and differential effects of light are involved. Miniature transmitters were implanted intraperitoneally in two Aotus females so that the core temperature could be measured in parallel with locomotor activity. The responses to brief reductions of of the dark-phase illuminance, from 10–1 to 10–3 1x, 10–5 1x or physiological darkness, indicate that the direct effects of light that modulate the activity of the owl monkeys also affect their temperature time-course. The influence on the temperature rhythm, unlike that on the activity rhythm, varies greatly over the circadian period. The finding that the core temperature does not always change in parallel with locomotor activity and, to some extent, reacts differently to the lightdark alternation indicates that temperature does not simply follow activity passively, but rather is partially subject to a ‘direct’ masking influence of the light.

© 1986 S. Karger AG, Basel


Article / Publication Details

First-Page Preview
Abstract of Paper

Published online: September 11, 2008
Issue release date: 1986

Number of Print Pages: 18
Number of Figures: 0
Number of Tables: 0

ISSN: 0015-5713 (Print)
eISSN: 1421-9980 (Online)

For additional information: http://www.karger.com/FPR


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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.
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