Published online by Cambridge University Press: 05 June 2012
INTRODUCTION
Terrestrial animals live in an environment that undergoes regular variations, ultimately induced by the geophysical conditions prevailing in our solar/earth system. Solar radiation and gravity, in combination with the earth's rotation around its inclined axis and its orbit around the sun, and the moon's revolution around earth, produce marked diurnal, seasonal and lunar as well as tidal periodicities in important physical environmental factors, such as light intensity, ambient temperature, humidity, precipitation, day and night length, and duration of twilight. As a consequence of these periodicities being superimposed on one another, many relevant biotic environmental factors, such as food availability and predator pressure, as well as social contact, communication and competition with conspecifics, and intra- and interspecific competition for food may also vary diurnally, seasonally, lunar periodically or tidally. In this way each animal's environment has a highly complex time structure, is highly repetitive in time and thus highly predictive. Reliable predictivity provides a good substrate for genetically fixed adaptations. Hence, in addition to other general or specific physiological, ecological and/or behavioural adaptations, animals have also evolved endogenous diurnal (circadian), annual (circannual), lunar (circalunar) and/or tidal (circatidal) rhythms.
In non-human primates (in the following referred to only as primates), adaptation to the time structure in their physical and biotic environment is restricted mainly to the development of a circadian timing system involved in the regulation of the pronounced daily (circadian) organisation of physiology and behaviour.
To save this book to your Kindle, first ensure [email protected] is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about saving to your Kindle.
Note you can select to save to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be saved to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.
Find out more about the Kindle Personal Document Service.
To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Dropbox.
To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Google Drive.