Activity Patterns in Small Mammals: An Ecological Approach by Stefan Halle, Nils Chr. Stenseth (auth.), Prof. Dr. Stefan

By Stefan Halle, Nils Chr. Stenseth (auth.), Prof. Dr. Stefan Halle, Prof. Dr. Nils Christian Stenseth (eds.)

Environmental stipulations swap significantly during 24 h with appreciate to abiotic components and intra- and interspecific interactions. those alterations lead to constrained time home windows of chance for animal actions and, for that reason, the query of whilst to do what's topic to health maximisation.
This quantity supplies a present evaluation of theoretical issues and empirical findings of job styles in small mammals, a gaggle within which the vigorous and ecological constraints are really serious and the range of job styles is especially excessive. Following a comparative ecological procedure, for the 1st time task timing is hence handled when it comes to behavioural and evolutionary ecology, offering the conceptual framework for chronoecology as a brand new subdiscipline inside behavioural ecology. an intensive Appendix offers an advent to tools of task modelling and to instruments for statistical trend analysis.

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Activity Patterns in Small Mammals: An Ecological Approach

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The relevant questions and the subdisciplines addressed for the examination of activity pat- 0:00 time budgets I Allocation of Resources 12:00 24:00 activity patterns ~ r---------~ Function of Processes r---------~ Entrainment of Patterns metabolism ecology chronobiology physiology evolution physiology ecology fig. 2. Time budgets and activity patterns as two different aspects of the temporal behaviour of animals. Time budgets represent the allocation of time and other resources to different kinds of activity.

LD 12:12 'Entrained" Days are indicated on the vertical axis. During the first 10 days of this record the rodent is housed 20 in constant darkness. Under this condition, the circadian clock expresses its own intrinsic 'free-running' cycle. In this example the 'free-running' circadian cycle is slightly longer than 24 h. On day 10 a light/dark cycle consisting of 12 h light and 12 h darkness (LD 12 : 12) is imposed. The circadian clock is synchronised or 'entrained' to 24 h by the LD cycle. Locomotor activity occurs during the 12-h dark phase (indicated by box) in this nocturnally-active rodent.

The mechanisms that reset the circadian clock to 24 h can be illustrated by observing how brief pulses of light reset circadian clocks that are freerunning in constant darkness. , the subjective phase of activity), then its circadian clock will be reset such that a delay in the normal onset of activity will occur. If a 10-min pulse of light is provided 6 h after the onset of activity, however, then its circadian clock will be reset such that an advance in the onset of activity will occur. If a 10-min pulse of light is provided at other times of the circadian cycle, then the timing of the clock is not altered.

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