density-independent factor


Also found in: Medical.

density-independent factor

[¦den·səd·ē ‚in·də¦pen·dənt ‚fak·tər]
(ecology)
A factor that affects the birth rate or mortality rate of a population in ways that are independent of the population density.
References in periodicals archive ?
When information on the dynamics of natural enemies, fluctuations in resource availability, and other density-dependent factors, as well as density-independent factors is not available in a changing environment, this approach has great potential and flexibility for approximating the underlying mechanisms of ecological time series data and for modeling various population dynamics.
Because the models are able to describe various density-dependent influences inherent in the time series data, and because different density-dependent models may indicate different strengths in interaction among groups of density-dependent and density-independent factors on the population dynamics, identifying certain density-dependent model forms may help in inferring the importance of certain environmental factors.
In practice, it may be difficult to carry out many independent field experiments, because of the correlation of density-independent factors in some large geographical regions (Royama 1992).