Reference Entry

exponential

Michael Allaby

in A Dictionary of Ecology

Fifth edition


Published online September 2015 | e-ISBN: 9780191793158

More Like This

Show all results sharing this subject:

  • Ecology and Conservation

GO

Show Summary Details

Preview

A mathematical function that varies as the power of a particular quantity (i.e. a rate of change (increase or decrease) that is calculated as a fixed percentage of the starting value and, therefore, in which the logarithms of a value change linearly in any given period of time). The amount of change in a particular period is calculated as the starting value plus the interest accrued in preceding periods, multiplied by the rate of change (e.g. for a quantity, starting at 100, that grows exponentially by 10 per cent in each unit of time: 100, 110 (100 + 10 per cent of 100), 121 (110 + 10 per cent of 110), 132.1 (121 + 10 per cent of 121),…). Fears have been expressed (e.g. by some environmentalists) that the size of the human population may increase exponentially and the demands such growth imposes on essential resources may cause stocks of these to be depleted exponentially. In biological (and economic) systems, however, exponential rates of change are never sustained (...

Reference Entry.  178 words. 

Subjects: Ecology and Conservation

Full text: subscription required

How to subscribe Recommend to my Librarian

Users without a subscription are not able to see the full content. Please, subscribe or login to access all content. subscribe or purchase to access all content.